RE: [PATCH 08/11] usb: Add USB subsystem notifications [ver #7]

From: Yoshihiro Shimoda
Date: Tue Sep 03 2019 - 04:53:51 EST

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Hi,

> From: David Howells, Sent: Friday, August 30, 2019 10:58 PM
<snip>
> diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
> index 9063ede411ae..b8572e4d6a1b 100644
> --- a/drivers/usb/core/devio.c
> +++ b/drivers/usb/core/devio.c
> @@ -41,6 +41,7 @@
> #include <linux/dma-mapping.h>
> #include <asm/byteorder.h>
> #include <linux/moduleparam.h>
> +#include <linux/watch_queue.h>
>
> #include "usb.h"
>
> @@ -2660,13 +2661,68 @@ static void usbdev_remove(struct usb_device *udev)
> }
> }
>
> +#ifdef CONFIG_USB_NOTIFICATIONS
> +static noinline void post_usb_notification(const char *devname,
> + enum usb_notification_type subtype,
> + u32 error)
> +{
> + unsigned int gran = WATCH_LENGTH_GRANULARITY;
> + unsigned int name_len, n_len;
> + u64 id = 0; /* Might want to put a dev# here. */
> +
> + struct {
> + struct usb_notification n;
> + char more_name[USB_NOTIFICATION_MAX_NAME_LEN -
> + (sizeof(struct usb_notification) -
> + offsetof(struct usb_notification, name))];
> + } n;
> +
> + name_len = strlen(devname);
> + name_len = min_t(size_t, name_len, USB_NOTIFICATION_MAX_NAME_LEN);
> + n_len = round_up(offsetof(struct usb_notification, name) + name_len,
> + gran) / gran;
> +
> + memset(&n, 0, sizeof(n));
> + memcpy(n.n.name, devname, n_len);
> +
> + n.n.watch.type = WATCH_TYPE_USB_NOTIFY;
> + n.n.watch.subtype = subtype;
> + n.n.watch.info = n_len;
> + n.n.error = error;
> + n.n.name_len = name_len;
> +
> + post_device_notification(&n.n.watch, id);
> +}
> +
> +void post_usb_device_notification(const struct usb_device *udev,
> + enum usb_notification_type subtype, u32 error)
> +{
> + post_usb_notification(dev_name(&udev->dev), subtype, error);
> +}
> +
> +void post_usb_bus_notification(const struct usb_bus *ubus,

This function's argument is struct usb_bus *, but ...

> + enum usb_notification_type subtype, u32 error)
> +{
> + post_usb_notification(ubus->bus_name, subtype, error);
> +}
> +#endif
> +
> static int usbdev_notify(struct notifier_block *self,
> unsigned long action, void *dev)
> {
> switch (action) {
> case USB_DEVICE_ADD:
> + post_usb_device_notification(dev, NOTIFY_USB_DEVICE_ADD, 0);
> break;
> case USB_DEVICE_REMOVE:
> + post_usb_device_notification(dev, NOTIFY_USB_DEVICE_REMOVE, 0);
> + usbdev_remove(dev);
> + break;
> + case USB_BUS_ADD:
> + post_usb_bus_notification(dev, NOTIFY_USB_BUS_ADD, 0);
> + break;
> + case USB_BUS_REMOVE:
> + post_usb_bus_notification(dev, NOTIFY_USB_BUS_REMOVE, 0);
> usbdev_remove(dev);

this function calls usbdev_remove() with incorrect argument if the action
is USB_BUS_REMOVE. So, this seems to cause the following issue [1] on
my environment (R-Car H3 / r8a7795 on next-20190902) [2]. However, I have
no idea how to fix the issue, so I report this issue at the first step.

JFYI, even if I have reverted this patch on next-20190902, other issue
appears [3].

[1] The following panic happened.
[ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x411fd073]
[ 0.000000] Linux version 5.3.0-rc6-next-20190902 (shimoda@shimoda-RB02198) (gcc version 7.4.1 20181213 [linaro-7.4-2019.02 revision 56ec6f6b99cc167ff0c2f8e1a2eed33b1edc85d4] (Linaro GCC 7.4-2019.02)) #47 SMP PREEMPT Tue Sep 3 17:42:01 JST 2019
[ 0.000000] Machine model: Renesas Salvator-X board based on r8a7795 ES2.0+
[ 0.000000] printk: debug: ignoring loglevel setting.
[ 0.000000] efi: Getting EFI parameters from FDT:
[ 0.000000] efi: UEFI not found.
[ 0.000000] cma: Reserved 32 MiB at 0x00000000be000000
[ 0.000000] NUMA: No NUMA configuration found
[ 0.000000] NUMA: Faking a node at [mem 0x0000000048000000-0x000000077fffffff]
[ 0.000000] NUMA: NODE_DATA [mem 0x77efdb800-0x77efdcfff]
[ 0.000000] Zone ranges:
[ 0.000000] DMA32 [mem 0x0000000048000000-0x00000000ffffffff]
[ 0.000000] Normal [mem 0x0000000100000000-0x000000077fffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000048000000-0x00000000bfffffff]
[ 0.000000] node 0: [mem 0x0000000500000000-0x000000057fffffff]
[ 0.000000] node 0: [mem 0x0000000600000000-0x000000067fffffff]
[ 0.000000] node 0: [mem 0x0000000700000000-0x000000077fffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000048000000-0x000000077fffffff]
[ 0.000000] On node 0 totalpages: 2064384
[ 0.000000] DMA32 zone: 7680 pages used for memmap
[ 0.000000] DMA32 zone: 0 pages reserved
[ 0.000000] DMA32 zone: 491520 pages, LIFO batch:63
[ 0.000000] Normal zone: 24576 pages used for memmap
[ 0.000000] Normal zone: 1572864 pages, LIFO batch:63
[ 0.000000] psci: probing for conduit method from DT.
[ 0.000000] psci: PSCIv1.1 detected in firmware.
[ 0.000000] psci: Using standard PSCI v0.2 function IDs
[ 0.000000] psci: Trusted OS migration not required
[ 0.000000] psci: SMC Calling Convention v1.1
[ 0.000000] percpu: Embedded 22 pages/cpu s52952 r8192 d28968 u90112
[ 0.000000] pcpu-alloc: s52952 r8192 d28968 u90112 alloc=22*4096
[ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 [0] 4 [0] 5 [0] 6 [0] 7
[ 0.000000] Detected PIPT I-cache on CPU0
[ 0.000000] CPU features: detected: EL2 vector hardening
[ 0.000000] Speculative Store Bypass Disable mitigation not required
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 2032128
[ 0.000000] Policy zone: Normal
[ 0.000000] Kernel command line: console=ttySC0,115200 ignore_loglevel consoleblank=0 rw root=/dev/nfs ip=dhcp
[ 0.000000] Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes, linear)
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] software IO TLB: mapped [mem 0xba000000-0xbe000000] (64MB)
[ 0.000000] Memory: 7972368K/8257536K available (12092K kernel code, 1846K rwdata, 6320K rodata, 4992K init, 450K bss, 252400K reserved, 32768K cma-reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=8, Nodes=1
[ 0.000000] rcu: Preemptible hierarchical RCU implementation.
[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=256 to nr_cpu_ids=8.
[ 0.000000] Tasks RCU enabled.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
[ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=8
[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[ 0.000000] GIC: Adjusting CPU interface base to 0x00000000f102f000
[ 0.000000] GIC: Using split EOI/Deactivate mode
[ 0.000000] random: get_random_bytes called from start_kernel+0x2f0/0x490 with crng_init=0
[ 0.000000] arch_timer: cp15 timer(s) running at 8.33MHz (phys).
[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x1ec02923e, max_idle_ns: 440795202125 ns
[ 0.000003] sched_clock: 56 bits at 8MHz, resolution 120ns, wraps every 2199023255496ns
[ 0.000142] Console: colour dummy device 80x25
[ 0.000211] Calibrating delay loop (skipped), value calculated using timer frequency.. 16.66 BogoMIPS (lpj=33333)
[ 0.000218] pid_max: default: 32768 minimum: 301
[ 0.000273] LSM: Security Framework initializing
[ 0.000351] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes, linear)
[ 0.000397] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes, linear)
[ 0.023974] ASID allocator initialised with 32768 entries
[ 0.031963] rcu: Hierarchical SRCU implementation.
[ 0.041031] Detected Renesas R-Car Gen3 r8a7795 ES3.0
[ 0.042354] EFI services will not be available.
[ 0.047989] smp: Bringing up secondary CPUs ...
[ 0.080173] Detected PIPT I-cache on CPU1
[ 0.080213] CPU1: Booted secondary processor 0x0000000001 [0x411fd073]
[ 0.112190] Detected PIPT I-cache on CPU2
[ 0.112210] CPU2: Booted secondary processor 0x0000000002 [0x411fd073]
[ 0.144225] Detected PIPT I-cache on CPU3
[ 0.144244] CPU3: Booted secondary processor 0x0000000003 [0x411fd073]
[ 0.176267] CPU features: detected: ARM erratum 845719
[ 0.176278] Detected VIPT I-cache on CPU4
[ 0.176316] CPU4: Booted secondary processor 0x0000000100 [0x410fd034]
[ 0.208292] Detected VIPT I-cache on CPU5
[ 0.208316] CPU5: Booted secondary processor 0x0000000101 [0x410fd034]
[ 0.240331] Detected VIPT I-cache on CPU6
[ 0.240354] CPU6: Booted secondary processor 0x0000000102 [0x410fd034]
[ 0.272365] Detected VIPT I-cache on CPU7
[ 0.272389] CPU7: Booted secondary processor 0x0000000103 [0x410fd034]
[ 0.272464] smp: Brought up 1 node, 8 CPUs
[ 0.272484] SMP: Total of 8 processors activated.
[ 0.272488] CPU features: detected: 32-bit EL0 Support
[ 0.272493] CPU features: detected: CRC32 instructions
[ 0.282612] CPU: All CPU(s) started at EL2
[ 0.282644] alternatives: patching kernel code
[ 0.283676] devtmpfs: initialized
[ 0.289458] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[ 0.289471] futex hash table entries: 2048 (order: 5, 131072 bytes, linear)
[ 0.290163] pinctrl core: initialized pinctrl subsystem
[ 0.291360] DMI not present or invalid.
[ 0.291607] NET: Registered protocol family 16
[ 0.292388] DMA: preallocated 256 KiB pool for atomic allocations
[ 0.292399] audit: initializing netlink subsys (disabled)
[ 0.292539] audit: type=2000 audit(0.292:1): state=initialized audit_enabled=0 res=1
[ 0.293573] cpuidle: using governor menu
[ 0.293733] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers.
[ 0.294678] Serial: AMBA PL011 UART driver
[ 0.296912] sh-pfc e6060000.pin-controller: IRQ index 0 not found
[ 0.297125] sh-pfc e6060000.pin-controller: r8a77951_pfc support registered
[ 0.317432] HugeTLB registered 1.00 GiB page size, pre-allocated 0 pages
[ 0.317439] HugeTLB registered 32.0 MiB page size, pre-allocated 0 pages
[ 0.317443] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
[ 0.317447] HugeTLB registered 64.0 KiB page size, pre-allocated 0 pages
[ 0.319199] cryptd: max_cpu_qlen set to 1000
[ 0.322091] ACPI: Interpreter disabled.
[ 0.325627] iommu: Default domain type: Translated
[ 0.325823] vgaarb: loaded
[ 0.326011] SCSI subsystem initialized
[ 0.326113] libata version 3.00 loaded.
[ 0.326243] usbcore: registered new interface driver usbfs
[ 0.326264] usbcore: registered new interface driver hub
[ 0.326307] usbcore: registered new device driver usb
[ 0.327255] i2c-sh_mobile e60b0000.i2c: I2C adapter 7, bus speed 400000 Hz
[ 0.327560] pps_core: LinuxPPS API ver. 1 registered
[ 0.327564] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@xxxxxxxx>
[ 0.327573] PTP clock support registered
[ 0.327701] EDAC MC: Ver: 3.0.0
[ 0.328991] FPGA manager framework
[ 0.329031] Advanced Linux Sound Architecture Driver Initialized.
[ 0.329497] clocksource: Switched to clocksource arch_sys_counter
[ 0.329639] VFS: Disk quotas dquot_6.6.0
[ 0.329682] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[ 0.329800] pnp: PnP ACPI: disabled
[ 0.332764] thermal_sys: Registered thermal governor 'step_wise'
[ 0.332767] thermal_sys: Registered thermal governor 'power_allocator'
[ 0.333270] NET: Registered protocol family 2
[ 0.333558] tcp_listen_portaddr_hash hash table entries: 4096 (order: 4, 65536 bytes, linear)
[ 0.333624] TCP established hash table entries: 65536 (order: 7, 524288 bytes, linear)
[ 0.333903] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes, linear)
[ 0.334489] TCP: Hash tables configured (established 65536 bind 65536)
[ 0.334606] UDP hash table entries: 4096 (order: 5, 131072 bytes, linear)
[ 0.334714] UDP-Lite hash table entries: 4096 (order: 5, 131072 bytes, linear)
[ 0.334929] NET: Registered protocol family 1
[ 0.335290] RPC: Registered named UNIX socket transport module.
[ 0.335295] RPC: Registered udp transport module.
[ 0.335299] RPC: Registered tcp transport module.
[ 0.335302] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.335311] PCI: CLS 0 bytes, default 64
[ 0.336141] hw perfevents: enabled with armv8_cortex_a53 PMU driver, 7 counters available
[ 0.336377] hw perfevents: enabled with armv8_cortex_a57 PMU driver, 7 counters available
[ 0.336799] kvm [1]: IPA Size Limit: 40bits
[ 0.337273] kvm [1]: vgic interrupt IRQ1
[ 0.337415] kvm [1]: Hyp mode initialized successfully
[ 0.341775] Initialise system trusted keyrings
[ 0.341864] workingset: timestamp_bits=44 max_order=21 bucket_order=0
[ 0.345076] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.345515] NFS: Registering the id_resolver key type
[ 0.345532] Key type id_resolver registered
[ 0.345535] Key type id_legacy registered
[ 0.345544] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 0.345638] 9p: Installing v9fs 9p2000 file system support
[ 0.354995] Key type asymmetric registered
[ 0.355001] Asymmetric key parser 'x509' registered
[ 0.355027] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 245)
[ 0.355032] io scheduler mq-deadline registered
[ 0.355036] io scheduler kyber registered
[ 0.359639] phy_rcar_gen3_usb2 ee0a0200.usb-phy: IRQ index 0 not found
[ 0.360346] phy_rcar_gen3_usb2 ee0c0200.usb-phy: IRQ index 0 not found
[ 0.366010] gpio_rcar e6050000.gpio: driving 16 GPIOs
[ 0.366187] gpio_rcar e6051000.gpio: driving 29 GPIOs
[ 0.366348] gpio_rcar e6052000.gpio: driving 15 GPIOs
[ 0.366504] gpio_rcar e6053000.gpio: driving 16 GPIOs
[ 0.366663] gpio_rcar e6054000.gpio: driving 18 GPIOs
[ 0.366816] gpio_rcar e6055000.gpio: driving 26 GPIOs
[ 0.366973] gpio_rcar e6055400.gpio: driving 32 GPIOs
[ 0.367126] gpio_rcar e6055800.gpio: driving 4 GPIOs
[ 0.368571] rcar-pcie fe000000.pcie: host bridge /soc/pcie@fe000000 ranges:
[ 0.368596] rcar-pcie fe000000.pcie: IO 0xfe100000..0xfe1fffff -> 0x00000000
[ 0.368613] rcar-pcie fe000000.pcie: MEM 0xfe200000..0xfe3fffff -> 0xfe200000
[ 0.368626] rcar-pcie fe000000.pcie: MEM 0x30000000..0x37ffffff -> 0x30000000
[ 0.368635] rcar-pcie fe000000.pcie: MEM 0x38000000..0x3fffffff -> 0x38000000
[ 0.433003] rcar-pcie fe000000.pcie: PCIe link down
[ 0.433148] rcar-pcie ee800000.pcie: host bridge /soc/pcie@ee800000 ranges:
[ 0.433165] rcar-pcie ee800000.pcie: IO 0xee900000..0xee9fffff -> 0x00000000
[ 0.433179] rcar-pcie ee800000.pcie: MEM 0xeea00000..0xeebfffff -> 0xeea00000
[ 0.433191] rcar-pcie ee800000.pcie: MEM 0xc0000000..0xc7ffffff -> 0xc0000000
[ 0.433200] rcar-pcie ee800000.pcie: MEM 0xc8000000..0xcfffffff -> 0xc8000000
[ 0.496985] rcar-pcie ee800000.pcie: PCIe link down
[ 0.498893] EINJ: ACPI disabled.
[ 0.510430] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 0.512246] SuperH (H)SCI(F) driver initialized
[ 0.512568] sh-sci e6550000.serial: IRQ index 1 not found
[ 0.512577] sh-sci e6550000.serial: IRQ index 2 not found
[ 0.512584] sh-sci e6550000.serial: IRQ index 3 not found
[ 0.512591] sh-sci e6550000.serial: IRQ index 4 not found
[ 0.512597] sh-sci e6550000.serial: IRQ index 5 not found
[ 0.512647] e6550000.serial: ttySC1 at MMIO 0xe6550000 (irq = 34, base_baud = 0) is a hscif
[ 0.513065] sh-sci e6e88000.serial: IRQ index 1 not found
[ 0.513073] sh-sci e6e88000.serial: IRQ index 2 not found
[ 0.513079] sh-sci e6e88000.serial: IRQ index 3 not found
[ 0.513086] sh-sci e6e88000.serial: IRQ index 4 not found
[ 0.513092] sh-sci e6e88000.serial: IRQ index 5 not found
[ 0.513119] e6e88000.serial: ttySC0 at MMIO 0xe6e88000 (irq = 119, base_baud = 0) is a scif
[ 1.655695] printk: console [ttySC0] enabled
[ 1.660706] msm_serial: driver initialized
[ 1.671544] loop: module loaded
[ 1.679482] libphy: Fixed MDIO Bus: probed
[ 1.683719] tun: Universal TUN/TAP device driver, 1.6
[ 1.689559] thunder_xcv, ver 1.0
[ 1.692805] thunder_bgx, ver 1.0
[ 1.696052] nicpf, ver 1.0
[ 1.699373] hclge is initializing
[ 1.702688] hns3: Hisilicon Ethernet Network Driver for Hip08 Family - version
[ 1.709907] hns3: Copyright (c) 2017 Huawei Corporation.
[ 1.715242] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[ 1.721073] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[ 1.727012] igb: Intel(R) Gigabit Ethernet Network Driver - version 5.6.0-k
[ 1.733971] igb: Copyright (c) 2007-2014 Intel Corporation.
[ 1.739557] igbvf: Intel(R) Gigabit Virtual Function Network Driver - version 2.4.0-k
[ 1.747383] igbvf: Copyright (c) 2009 - 2012 Intel Corporation.
[ 1.753636] sky2: driver version 1.30
[ 1.758264] VFIO - User Level meta-driver version: 0.3
[ 1.764783] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 1.771320] ehci-pci: EHCI PCI platform driver
[ 1.775780] ehci-platform: EHCI generic platform driver
[ 1.781335] ehci-platform ee0a0100.usb: EHCI Host Controller
[ 1.787016] ehci-platform ee0a0100.usb: new USB bus registered, assigned bus number 1
[ 1.794935] ehci-platform ee0a0100.usb: irq 165, io mem 0xee0a0100
[ 1.813507] ehci-platform ee0a0100.usb: USB 2.0 started, EHCI 1.10
[ 1.820044] hub 1-0:1.0: USB hub found
[ 1.823828] hub 1-0:1.0: 1 port detected
[ 1.828017] ehci-platform ee0c0100.usb: EHCI Host Controller
[ 1.833684] ehci-platform ee0c0100.usb: new USB bus registered, assigned bus number 2
[ 1.841560] ehci-platform ee0c0100.usb: irq 166, io mem 0xee0c0100
[ 1.861506] ehci-platform ee0c0100.usb: USB 2.0 started, EHCI 1.10
[ 1.867940] hub 2-0:1.0: USB hub found
[ 1.871704] hub 2-0:1.0: 1 port detected
[ 1.875860] ehci-orion: EHCI orion driver
[ 1.880049] ehci-exynos: EHCI EXYNOS driver
[ 1.884320] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 1.890509] ohci-pci: OHCI PCI platform driver
[ 1.894978] ohci-platform: OHCI generic platform driver
[ 1.900444] ohci-platform ee0a0000.usb: Generic Platform OHCI controller
[ 1.907159] ohci-platform ee0a0000.usb: new USB bus registered, assigned bus number 3
[ 1.915025] ohci-platform ee0a0000.usb: irq 165, io mem 0xee0a0000
[ 2.008477] hub 3-0:1.0: USB hub found
[ 2.012244] hub 3-0:1.0: 1 port detected
[ 2.016388] ohci-platform ee0c0000.usb: Generic Platform OHCI controller
[ 2.023097] ohci-platform ee0c0000.usb: new USB bus registered, assigned bus number 4
[ 2.030977] ohci-platform ee0c0000.usb: irq 166, io mem 0xee0c0000
[ 2.124457] hub 4-0:1.0: USB hub found
[ 2.128220] hub 4-0:1.0: 1 port detected
[ 2.132361] ohci-exynos: OHCI EXYNOS driver
[ 2.137069] xhci-hcd ee000000.usb: xHCI Host Controller
[ 2.142305] xhci-hcd ee000000.usb: new USB bus registered, assigned bus number 5
[ 2.149748] xhci-hcd ee000000.usb: Direct firmware load for r8a779x_usb3_v3.dlmem failed with error -2
[ 2.159063] xhci-hcd ee000000.usb: can't setup: -2
[ 2.163861] xhci-hcd ee000000.usb: USB bus 5 deregistered
[ 2.169266] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020
[ 2.178042] Mem abort info:
[ 2.180828] ESR = 0x96000004
[ 2.183876] EC = 0x25: DABT (current EL), IL = 32 bits
[ 2.189179] SET = 0, FnV = 0
[ 2.192226] EA = 0, S1PTW = 0
[ 2.195358] Data abort info:
[ 2.198231] ISV = 0, ISS = 0x00000004
[ 2.202058] CM = 0, WnR = 0
[ 2.205019] [0000000000000020] user address but active_mm is swapper
[ 2.211366] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 2.216930] Modules linked in:
[ 2.219981] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 5.3.0-rc6-next-20190902 #47
[ 2.227456] Hardware name: Renesas Salvator-X board based on r8a7795 ES2.0+ (DT)
[ 2.234844] pstate: a0000085 (NzCv daIf -PAN -UAO)
[ 2.239638] pc : _raw_write_lock+0x68/0x288
[ 2.243819] lr : destroy_async+0x20/0xb0
[ 2.247733] sp : ffff80001006b9b0
[ 2.251040] x29: ffff80001006b9b0 x28: ffff800011186fd8
[ 2.256345] x27: ffff800011186fc0 x26: 00000000ffffffed
[ 2.261650] x25: ffff8000118ff570 x24: ffff8000118ff000
[ 2.266955] x23: 0000000000000004 x22: ffff800011900000
[ 2.272259] x21: 0000000000000020 x20: 0000000000000028
[ 2.277564] x19: 0000000000000000 x18: 0000000000000005
[ 2.282868] x17: 0000000000000020 x16: ffff800010d164b0
[ 2.288172] x15: ffff8000118ff6e8 x14: ffff000735867958
[ 2.293476] x13: 0000000000000000 x12: ffff8000118ff6e8
[ 2.298779] x11: ffff000735867908 x10: 0000000000000040
[ 2.304083] x9 : ffff8000118ff6f0 x8 : ffff8000118ff6e8
[ 2.309388] x7 : ffff000735867958 x6 : 0000000000000000
[ 2.314691] x5 : 0000000000000001 x4 : 0000000000000000
[ 2.319995] x3 : 0000000000000020 x2 : 0000000000000001
[ 2.325299] x1 : 0000000000000000 x0 : 0000000000000001
[ 2.330604] Call trace:
[ 2.333045] _raw_write_lock+0x68/0x288
[ 2.336874] destroy_async+0x20/0xb0
[ 2.340443] usbdev_remove+0x3c/0xc0
[ 2.344011] usbdev_notify+0x20/0x38
[ 2.347583] notifier_call_chain+0x54/0x98
[ 2.351672] blocking_notifier_call_chain+0x48/0x70
[ 2.356543] usb_notify_remove_bus+0x1c/0x28
[ 2.360808] usb_deregister_bus+0x58/0x68
[ 2.364811] usb_add_hcd+0x234/0x730
[ 2.368381] xhci_plat_probe+0x4ec/0x650
[ 2.372302] platform_drv_probe+0x50/0xa0
[ 2.376305] really_probe+0xdc/0x350
[ 2.379874] driver_probe_device+0x58/0x100
[ 2.384050] device_driver_attach+0x6c/0x90
[ 2.388226] __driver_attach+0x84/0xc8
[ 2.391968] bus_for_each_dev+0x74/0xc8
[ 2.395796] driver_attach+0x20/0x28
[ 2.399365] bus_add_driver+0x148/0x1f0
[ 2.403193] driver_register+0x60/0x110
[ 2.407022] __platform_driver_register+0x40/0x48
[ 2.411723] xhci_plat_init+0x2c/0x34
[ 2.415380] do_one_initcall+0x5c/0x1b0
[ 2.419213] kernel_init_freeable+0x1a4/0x24c
[ 2.423564] kernel_init+0x10/0x108
[ 2.427045] ret_from_fork+0x10/0x18
[ 2.430617] Code: 97d3f2b6 a8c17bfd d65f03c0 f9800071 (885ffc60)
[ 2.436717] ---[ end trace 33e4fb349eb48047 ]---
[ 2.441345] note: swapper/0[1] exited with preempt_count 1
[ 2.446846] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[ 2.454497] SMP: stopping secondary CPUs
[ 2.458416] Kernel Offset: disabled
[ 2.461898] CPU features: 0x0002,21006004
[ 2.465899] Memory Limit: none
[ 2.468950] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---

[2] I'm using defconfig on arch/arm64 and disable CONFIG_FW_LOADER_USER_HELPER.

[3] The following panic happened when I reverted the commit ef9cc255c9539288f119156412d23a4b785f3599
on next-20190902.
[ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x411fd073]
[ 0.000000] Linux version 5.3.0-rc6-next-20190902-00001-g9709468 (shimoda@shimoda-RB02198) (gcc version 7.4.1 20181213 [linaro-7.4-2019.02 revision 56ec6f6b99cc167ff0c2f8e1a2eed33b1edc85d4] (Linaro GCC 7.4-2019.02)) #48 SMP PREEMPT Tue Sep 3 17:46:54 JST 2019
[ 0.000000] Machine model: Renesas Salvator-X board based on r8a7795 ES2.0+
[ 0.000000] printk: debug: ignoring loglevel setting.
[ 0.000000] efi: Getting EFI parameters from FDT:
[ 0.000000] efi: UEFI not found.
[ 0.000000] cma: Reserved 32 MiB at 0x00000000be000000
[ 0.000000] NUMA: No NUMA configuration found
[ 0.000000] NUMA: Faking a node at [mem 0x0000000048000000-0x000000077fffffff]
[ 0.000000] NUMA: NODE_DATA [mem 0x77efdb800-0x77efdcfff]
[ 0.000000] Zone ranges:
[ 0.000000] DMA32 [mem 0x0000000048000000-0x00000000ffffffff]
[ 0.000000] Normal [mem 0x0000000100000000-0x000000077fffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000048000000-0x00000000bfffffff]
[ 0.000000] node 0: [mem 0x0000000500000000-0x000000057fffffff]
[ 0.000000] node 0: [mem 0x0000000600000000-0x000000067fffffff]
[ 0.000000] node 0: [mem 0x0000000700000000-0x000000077fffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000048000000-0x000000077fffffff]
[ 0.000000] On node 0 totalpages: 2064384
[ 0.000000] DMA32 zone: 7680 pages used for memmap
[ 0.000000] DMA32 zone: 0 pages reserved
[ 0.000000] DMA32 zone: 491520 pages, LIFO batch:63
[ 0.000000] Normal zone: 24576 pages used for memmap
[ 0.000000] Normal zone: 1572864 pages, LIFO batch:63
[ 0.000000] psci: probing for conduit method from DT.
[ 0.000000] psci: PSCIv1.1 detected in firmware.
[ 0.000000] psci: Using standard PSCI v0.2 function IDs
[ 0.000000] psci: Trusted OS migration not required
[ 0.000000] psci: SMC Calling Convention v1.1
[ 0.000000] percpu: Embedded 22 pages/cpu s52952 r8192 d28968 u90112
[ 0.000000] pcpu-alloc: s52952 r8192 d28968 u90112 alloc=22*4096
[ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 [0] 4 [0] 5 [0] 6 [0] 7
[ 0.000000] Detected PIPT I-cache on CPU0
[ 0.000000] CPU features: detected: EL2 vector hardening
[ 0.000000] Speculative Store Bypass Disable mitigation not required
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 2032128
[ 0.000000] Policy zone: Normal
[ 0.000000] Kernel command line: console=ttySC0,115200 ignore_loglevel consoleblank=0 rw root=/dev/nfs ip=dhcp
[ 0.000000] Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes, linear)
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] software IO TLB: mapped [mem 0xba000000-0xbe000000] (64MB)
[ 0.000000] Memory: 7972368K/8257536K available (12092K kernel code, 1846K rwdata, 6320K rodata, 4992K init, 450K bss, 252400K reserved, 32768K cma-reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=8, Nodes=1
[ 0.000000] rcu: Preemptible hierarchical RCU implementation.
[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=256 to nr_cpu_ids=8.
[ 0.000000] Tasks RCU enabled.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
[ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=8
[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[ 0.000000] GIC: Adjusting CPU interface base to 0x00000000f102f000
[ 0.000000] GIC: Using split EOI/Deactivate mode
[ 0.000000] random: get_random_bytes called from start_kernel+0x2f0/0x490 with crng_init=0
[ 0.000000] arch_timer: cp15 timer(s) running at 8.33MHz (phys).
[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x1ec02923e, max_idle_ns: 440795202125 ns
[ 0.000002] sched_clock: 56 bits at 8MHz, resolution 120ns, wraps every 2199023255496ns
[ 0.000141] Console: colour dummy device 80x25
[ 0.000207] Calibrating delay loop (skipped), value calculated using timer frequency.. 16.66 BogoMIPS (lpj=33333)
[ 0.000215] pid_max: default: 32768 minimum: 301
[ 0.000270] LSM: Security Framework initializing
[ 0.000352] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes, linear)
[ 0.000398] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes, linear)
[ 0.023978] ASID allocator initialised with 32768 entries
[ 0.031968] rcu: Hierarchical SRCU implementation.
[ 0.041040] Detected Renesas R-Car Gen3 r8a7795 ES3.0
[ 0.042364] EFI services will not be available.
[ 0.047996] smp: Bringing up secondary CPUs ...
[ 0.080183] Detected PIPT I-cache on CPU1
[ 0.080222] CPU1: Booted secondary processor 0x0000000001 [0x411fd073]
[ 0.112195] Detected PIPT I-cache on CPU2
[ 0.112216] CPU2: Booted secondary processor 0x0000000002 [0x411fd073]
[ 0.144232] Detected PIPT I-cache on CPU3
[ 0.144253] CPU3: Booted secondary processor 0x0000000003 [0x411fd073]
[ 0.176276] CPU features: detected: ARM erratum 845719
[ 0.176286] Detected VIPT I-cache on CPU4
[ 0.176324] CPU4: Booted secondary processor 0x0000000100 [0x410fd034]
[ 0.208297] Detected VIPT I-cache on CPU5
[ 0.208321] CPU5: Booted secondary processor 0x0000000101 [0x410fd034]
[ 0.240338] Detected VIPT I-cache on CPU6
[ 0.240361] CPU6: Booted secondary processor 0x0000000102 [0x410fd034]
[ 0.272375] Detected VIPT I-cache on CPU7
[ 0.272398] CPU7: Booted secondary processor 0x0000000103 [0x410fd034]
[ 0.272473] smp: Brought up 1 node, 8 CPUs
[ 0.272492] SMP: Total of 8 processors activated.
[ 0.272497] CPU features: detected: 32-bit EL0 Support
[ 0.272502] CPU features: detected: CRC32 instructions
[ 0.282749] CPU: All CPU(s) started at EL2
[ 0.282777] alternatives: patching kernel code
[ 0.283815] devtmpfs: initialized
[ 0.289644] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[ 0.289659] futex hash table entries: 2048 (order: 5, 131072 bytes, linear)
[ 0.290353] pinctrl core: initialized pinctrl subsystem
[ 0.291538] DMI not present or invalid.
[ 0.291777] NET: Registered protocol family 16
[ 0.292561] DMA: preallocated 256 KiB pool for atomic allocations
[ 0.292571] audit: initializing netlink subsys (disabled)
[ 0.292709] audit: type=2000 audit(0.292:1): state=initialized audit_enabled=0 res=1
[ 0.293743] cpuidle: using governor menu
[ 0.293898] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers.
[ 0.294862] Serial: AMBA PL011 UART driver
[ 0.297061] sh-pfc e6060000.pin-controller: IRQ index 0 not found
[ 0.297280] sh-pfc e6060000.pin-controller: r8a77951_pfc support registered
[ 0.317490] HugeTLB registered 1.00 GiB page size, pre-allocated 0 pages
[ 0.317498] HugeTLB registered 32.0 MiB page size, pre-allocated 0 pages
[ 0.317503] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
[ 0.317506] HugeTLB registered 64.0 KiB page size, pre-allocated 0 pages
[ 0.319278] cryptd: max_cpu_qlen set to 1000
[ 0.322162] ACPI: Interpreter disabled.
[ 0.325707] iommu: Default domain type: Translated
[ 0.325909] vgaarb: loaded
[ 0.326100] SCSI subsystem initialized
[ 0.326199] libata version 3.00 loaded.
[ 0.326333] usbcore: registered new interface driver usbfs
[ 0.326353] usbcore: registered new interface driver hub
[ 0.326395] usbcore: registered new device driver usb
[ 0.327336] i2c-sh_mobile e60b0000.i2c: I2C adapter 7, bus speed 400000 Hz
[ 0.327631] pps_core: LinuxPPS API ver. 1 registered
[ 0.327636] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@xxxxxxxx>
[ 0.327644] PTP clock support registered
[ 0.327770] EDAC MC: Ver: 3.0.0
[ 0.329047] FPGA manager framework
[ 0.329089] Advanced Linux Sound Architecture Driver Initialized.
[ 0.329548] clocksource: Switched to clocksource arch_sys_counter
[ 0.329696] VFS: Disk quotas dquot_6.6.0
[ 0.329738] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[ 0.329855] pnp: PnP ACPI: disabled
[ 0.332843] thermal_sys: Registered thermal governor 'step_wise'
[ 0.332845] thermal_sys: Registered thermal governor 'power_allocator'
[ 0.333337] NET: Registered protocol family 2
[ 0.333618] tcp_listen_portaddr_hash hash table entries: 4096 (order: 4, 65536 bytes, linear)
[ 0.333682] TCP established hash table entries: 65536 (order: 7, 524288 bytes, linear)
[ 0.333961] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes, linear)
[ 0.334551] TCP: Hash tables configured (established 65536 bind 65536)
[ 0.334661] UDP hash table entries: 4096 (order: 5, 131072 bytes, linear)
[ 0.334769] UDP-Lite hash table entries: 4096 (order: 5, 131072 bytes, linear)
[ 0.334979] NET: Registered protocol family 1
[ 0.335329] RPC: Registered named UNIX socket transport module.
[ 0.335333] RPC: Registered udp transport module.
[ 0.335337] RPC: Registered tcp transport module.
[ 0.335340] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.335349] PCI: CLS 0 bytes, default 64
[ 0.336179] hw perfevents: enabled with armv8_cortex_a53 PMU driver, 7 counters available
[ 0.336413] hw perfevents: enabled with armv8_cortex_a57 PMU driver, 7 counters available
[ 0.336837] kvm [1]: IPA Size Limit: 40bits
[ 0.337313] kvm [1]: vgic interrupt IRQ1
[ 0.337458] kvm [1]: Hyp mode initialized successfully
[ 0.341834] Initialise system trusted keyrings
[ 0.341924] workingset: timestamp_bits=44 max_order=21 bucket_order=0
[ 0.345148] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.345585] NFS: Registering the id_resolver key type
[ 0.345602] Key type id_resolver registered
[ 0.345606] Key type id_legacy registered
[ 0.345615] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 0.345714] 9p: Installing v9fs 9p2000 file system support
[ 0.354814] Key type asymmetric registered
[ 0.354819] Asymmetric key parser 'x509' registered
[ 0.354844] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 245)
[ 0.354849] io scheduler mq-deadline registered
[ 0.354853] io scheduler kyber registered
[ 0.359476] phy_rcar_gen3_usb2 ee0a0200.usb-phy: IRQ index 0 not found
[ 0.360174] phy_rcar_gen3_usb2 ee0c0200.usb-phy: IRQ index 0 not found
[ 0.365881] gpio_rcar e6050000.gpio: driving 16 GPIOs
[ 0.366057] gpio_rcar e6051000.gpio: driving 29 GPIOs
[ 0.366222] gpio_rcar e6052000.gpio: driving 15 GPIOs
[ 0.366376] gpio_rcar e6053000.gpio: driving 16 GPIOs
[ 0.366536] gpio_rcar e6054000.gpio: driving 18 GPIOs
[ 0.366688] gpio_rcar e6055000.gpio: driving 26 GPIOs
[ 0.366860] gpio_rcar e6055400.gpio: driving 32 GPIOs
[ 0.367015] gpio_rcar e6055800.gpio: driving 4 GPIOs
[ 0.368473] rcar-pcie fe000000.pcie: host bridge /soc/pcie@fe000000 ranges:
[ 0.368498] rcar-pcie fe000000.pcie: IO 0xfe100000..0xfe1fffff -> 0x00000000
[ 0.368514] rcar-pcie fe000000.pcie: MEM 0xfe200000..0xfe3fffff -> 0xfe200000
[ 0.368527] rcar-pcie fe000000.pcie: MEM 0x30000000..0x37ffffff -> 0x30000000
[ 0.368536] rcar-pcie fe000000.pcie: MEM 0x38000000..0x3fffffff -> 0x38000000
[ 0.437037] rcar-pcie fe000000.pcie: PCIe link down
[ 0.437187] rcar-pcie ee800000.pcie: host bridge /soc/pcie@ee800000 ranges:
[ 0.437205] rcar-pcie ee800000.pcie: IO 0xee900000..0xee9fffff -> 0x00000000
[ 0.437218] rcar-pcie ee800000.pcie: MEM 0xeea00000..0xeebfffff -> 0xeea00000
[ 0.437230] rcar-pcie ee800000.pcie: MEM 0xc0000000..0xc7ffffff -> 0xc0000000
[ 0.437239] rcar-pcie ee800000.pcie: MEM 0xc8000000..0xcfffffff -> 0xc8000000
[ 0.501036] rcar-pcie ee800000.pcie: PCIe link down
[ 0.502959] EINJ: ACPI disabled.
[ 0.514458] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 0.516285] SuperH (H)SCI(F) driver initialized
[ 0.516608] sh-sci e6550000.serial: IRQ index 1 not found
[ 0.516616] sh-sci e6550000.serial: IRQ index 2 not found
[ 0.516624] sh-sci e6550000.serial: IRQ index 3 not found
[ 0.516630] sh-sci e6550000.serial: IRQ index 4 not found
[ 0.516637] sh-sci e6550000.serial: IRQ index 5 not found
[ 0.516685] e6550000.serial: ttySC1 at MMIO 0xe6550000 (irq = 34, base_baud = 0) is a hscif
[ 0.517112] sh-sci e6e88000.serial: IRQ index 1 not found
[ 0.517121] sh-sci e6e88000.serial: IRQ index 2 not found
[ 0.517128] sh-sci e6e88000.serial: IRQ index 3 not found
[ 0.517134] sh-sci e6e88000.serial: IRQ index 4 not found
[ 0.517140] sh-sci e6e88000.serial: IRQ index 5 not found
[ 0.517169] e6e88000.serial: ttySC0 at MMIO 0xe6e88000 (irq = 119, base_baud = 0) is a scif
[ 1.661047] printk: console [ttySC0] enabled
[ 1.666084] msm_serial: driver initialized
[ 1.676874] loop: module loaded
[ 1.684780] libphy: Fixed MDIO Bus: probed
[ 1.689023] tun: Universal TUN/TAP device driver, 1.6
[ 1.694842] thunder_xcv, ver 1.0
[ 1.698099] thunder_bgx, ver 1.0
[ 1.701336] nicpf, ver 1.0
[ 1.704657] hclge is initializing
[ 1.707971] hns3: Hisilicon Ethernet Network Driver for Hip08 Family - version
[ 1.715189] hns3: Copyright (c) 2017 Huawei Corporation.
[ 1.720525] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[ 1.726355] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[ 1.732292] igb: Intel(R) Gigabit Ethernet Network Driver - version 5.6.0-k
[ 1.739250] igb: Copyright (c) 2007-2014 Intel Corporation.
[ 1.744836] igbvf: Intel(R) Gigabit Virtual Function Network Driver - version 2.4.0-k
[ 1.752662] igbvf: Copyright (c) 2009 - 2012 Intel Corporation.
[ 1.758910] sky2: driver version 1.30
[ 1.763530] VFIO - User Level meta-driver version: 0.3
[ 1.770067] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 1.776596] ehci-pci: EHCI PCI platform driver
[ 1.781050] ehci-platform: EHCI generic platform driver
[ 1.786609] ehci-platform ee0a0100.usb: EHCI Host Controller
[ 1.792287] ehci-platform ee0a0100.usb: new USB bus registered, assigned bus number 1
[ 1.800200] ehci-platform ee0a0100.usb: irq 165, io mem 0xee0a0100
[ 1.821568] ehci-platform ee0a0100.usb: USB 2.0 started, EHCI 1.10
[ 1.828087] hub 1-0:1.0: USB hub found
[ 1.831856] hub 1-0:1.0: 1 port detected
[ 1.836044] ehci-platform ee0c0100.usb: EHCI Host Controller
[ 1.841711] ehci-platform ee0c0100.usb: new USB bus registered, assigned bus number 2
[ 1.849592] ehci-platform ee0c0100.usb: irq 166, io mem 0xee0c0100
[ 1.869555] ehci-platform ee0c0100.usb: USB 2.0 started, EHCI 1.10
[ 1.875993] hub 2-0:1.0: USB hub found
[ 1.879757] hub 2-0:1.0: 1 port detected
[ 1.883910] ehci-orion: EHCI orion driver
[ 1.888098] ehci-exynos: EHCI EXYNOS driver
[ 1.892371] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 1.898562] ohci-pci: OHCI PCI platform driver
[ 1.903033] ohci-platform: OHCI generic platform driver
[ 1.908496] ohci-platform ee0a0000.usb: Generic Platform OHCI controller
[ 1.915209] ohci-platform ee0a0000.usb: new USB bus registered, assigned bus number 3
[ 1.923072] ohci-platform ee0a0000.usb: irq 165, io mem 0xee0a0000
[ 2.016534] hub 3-0:1.0: USB hub found
[ 2.020298] hub 3-0:1.0: 1 port detected
[ 2.024438] ohci-platform ee0c0000.usb: Generic Platform OHCI controller
[ 2.031147] ohci-platform ee0c0000.usb: new USB bus registered, assigned bus number 4
[ 2.039026] ohci-platform ee0c0000.usb: irq 166, io mem 0xee0c0000
[ 2.132519] hub 4-0:1.0: USB hub found
[ 2.136281] hub 4-0:1.0: 1 port detected
[ 2.140417] ohci-exynos: OHCI EXYNOS driver
[ 2.145110] xhci-hcd ee000000.usb: xHCI Host Controller
[ 2.150344] xhci-hcd ee000000.usb: new USB bus registered, assigned bus number 5
[ 2.157782] xhci-hcd ee000000.usb: Direct firmware load for r8a779x_usb3_v3.dlmem failed with error -2
[ 2.167098] xhci-hcd ee000000.usb: can't setup: -2
[ 2.171895] xhci-hcd ee000000.usb: USB bus 5 deregistered
[ 2.177324] xhci-hcd: probe of ee000000.usb failed with error -2
[ 2.183655] usbcore: registered new interface driver usb-storage
[ 2.192417] i2c /dev entries driver
[ 2.203824] cs2000-cp 2-004f: revision - C1
[ 2.208051] i2c-rcar e6510000.i2c: probed
[ 2.212397] pca953x 4-0020: 4-0020 supply vcc not found, using dummy regulator
[ 2.220399] i2c-rcar e66d8000.i2c: probed
[ 2.231022] rcar_gen3_thermal e6198000.thermal: TSC0: Loaded 1 trip points
[ 2.242049] rcar_gen3_thermal e6198000.thermal: TSC1: Loaded 1 trip points
[ 2.253051] rcar_gen3_thermal e6198000.thermal: TSC2: Loaded 2 trip points
[ 2.262525] cpufreq: cpufreq_online: CPU0: Running at unlisted freq: 1499999 KHz
[ 2.269954] cpufreq: cpufreq_online: CPU0: Unlisted initial frequency changed to: 1500000 KHz
[ 2.278842] cpufreq: cpufreq_online: CPU4: Running at unlisted freq: 1199999 KHz
[ 2.286537] cpufreq: cpufreq_online: CPU4: Unlisted initial frequency changed to: 1200000 KHz
[ 2.295864] sdhci: Secure Digital Host Controller Interface driver
[ 2.302048] sdhci: Copyright(c) Pierre Ossman
[ 2.307021] renesas_sdhi_internal_dmac ee100000.sd: Got CD GPIO
[ 2.312959] renesas_sdhi_internal_dmac ee100000.sd: Got WP GPIO
[ 2.389858] renesas_sdhi_internal_dmac ee140000.sd: IRQ index 1 not found
[ 2.396653] renesas_sdhi_internal_dmac ee140000.sd: mmc0 base at 0xee140000 max clock rate 200 MHz
[ 2.405964] renesas_sdhi_internal_dmac ee160000.sd: Got CD GPIO
[ 2.411904] renesas_sdhi_internal_dmac ee160000.sd: Got WP GPIO
[ 2.418211] Synopsys Designware Multimedia Card Interface Driver
[ 2.425178] sdhci-pltfm: SDHCI platform and OF driver helper
[ 2.432494] ledtrig-cpu: registered to indicate activity on CPUs
[ 2.439571] usbcore: registered new interface driver usbhid
[ 2.445144] usbhid: USB HID core driver
[ 2.452453] NET: Registered protocol family 17
[ 2.457011] 9pnet: Installing 9P2000 support
[ 2.461319] Key type dns_resolver registered
[ 2.465799] registered taskstats version 1
[ 2.469898] Loading compiled-in X.509 certificates
[ 2.482897] renesas_irqc e61c0000.interrupt-controller: driving 6 irqs
[ 2.495600] bd9571mwv 7-0030: Device: BD9571MWV rev. 1
[ 2.515031] mmc0: new HS400 MMC card at address 0001
[ 2.520418] mmcblk0: mmc0:0001 BGSD3R 29.1 GiB
[ 2.525131] mmcblk0boot0: mmc0:0001 BGSD3R partition 1 16.0 MiB
[ 2.529575] ehci-platform ee080100.usb: EHCI Host Controller
[ 2.531207] mmcblk0boot1: mmc0:0001 BGSD3R partition 2 16.0 MiB
[ 2.536718] ehci-platform ee080100.usb: new USB bus registered, assigned bus number 5
[ 2.542734] mmcblk0rpmb: mmc0:0001 BGSD3R partition 3 4.00 MiB, chardev (237:0)
[ 2.550499] ehci-platform ee080100.usb: irq 164, io mem 0xee080100
[ 2.558357] mmcblk0: p1
[ 2.577560] ehci-platform ee080100.usb: USB 2.0 started, EHCI 1.10
[ 2.584084] hub 5-0:1.0: USB hub found
[ 2.587851] hub 5-0:1.0: 1 port detected
[ 2.592849] ohci-platform ee080000.usb: Generic Platform OHCI controller
[ 2.599569] ohci-platform ee080000.usb: new USB bus registered, assigned bus number 6
[ 2.607446] ohci-platform ee080000.usb: irq 164, io mem 0xee080000
[ 2.704528] hub 6-0:1.0: USB hub found
[ 2.708295] hub 6-0:1.0: 1 port detected
[ 2.713342] renesas_sdhi_internal_dmac ee100000.sd: Got CD GPIO
[ 2.719283] renesas_sdhi_internal_dmac ee100000.sd: Got WP GPIO
[ 2.795713] renesas_sdhi_internal_dmac ee100000.sd: IRQ index 1 not found
[ 2.802509] renesas_sdhi_internal_dmac ee100000.sd: mmc1 base at 0xee100000 max clock rate 200 MHz
[ 2.812389] renesas_sdhi_internal_dmac ee160000.sd: Got CD GPIO
[ 2.818337] renesas_sdhi_internal_dmac ee160000.sd: Got WP GPIO
[ 2.894683] renesas_sdhi_internal_dmac ee160000.sd: IRQ index 1 not found
[ 2.901477] renesas_sdhi_internal_dmac ee160000.sd: mmc2 base at 0xee160000 max clock rate 200 MHz
[ 2.914096] rcar-dmac e6700000.dma-controller: ignoring dependency for device, assuming no driver
[ 2.925001] rcar-dmac e7300000.dma-controller: ignoring dependency for device, assuming no driver
[ 2.935788] rcar-dmac e7310000.dma-controller: ignoring dependency for device, assuming no driver
[ 2.946621] rcar-dmac ec700000.dma-controller: ignoring dependency for device, assuming no driver
[ 2.957413] rcar-dmac ec720000.dma-controller: ignoring dependency for device, assuming no driver
[ 2.968426] sata_rcar ee300000.sata: ignoring dependency for device, assuming no driver
[ 2.976875] scsi host0: sata_rcar
[ 2.980348] ata1: SATA max UDMA/133 irq 170
[ 2.985299] ravb e6800000.ethernet: ignoring dependency for device, assuming no driver
[ 2.993512] libphy: ravb_mii: probed
[ 2.998278] ravb e6800000.ethernet eth0: Base address at 0xe6800000, 2e:09:0a:00:83:ea, IRQ 116.
[ 3.008624] input: keys as /devices/platform/keys/input/input0
[ 3.014713] hctosys: unable to open rtc device (rtc0)
[ 3.096510] Micrel KSZ9031 Gigabit PHY e6800000.ethernet-ffffffff:00: attached PHY driver [Micrel KSZ9031 Gigabit PHY] (mii_bus:phy_addr=e6800000.ethernet-ffffffff:00, irq=175)
[ 3.401564] ata1: link resume succeeded after 1 retries
[ 3.513072] ata1: SATA link down (SStatus 0 SControl 300)
[ 4.742059] ravb e6800000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off
[ 4.773553] Sending DHCP requests ..,
[ 7.413975] random: fast init done
[ 7.421550] OK
[ 7.423320] IP-Config: Got DHCP answer from 192.168.44.74, my address is 192.168.44.104
[ 7.431336] IP-Config: Complete:
[ 7.434568] device=eth0, hwaddr=2e:09:0a:00:83:ea, ipaddr=192.168.44.104, mask=255.255.255.0, gw=192.168.44.74
[ 7.445000] host=192.168.44.104, domain=shimoda-i7.org, nis-domain=(none)
[ 7.452218] bootserver=192.168.44.74, rootserver=192.168.44.74, rootpath=/var/lib/tftpboot/aarch64/rootfs/buildroot
[ 7.452220] nameserver0=192.168.44.74
[ 7.467553] SDHI0 Vcc: disabling
[ 7.470782] SDHI3 Vcc: disabling
[ 7.474008] SDHI0 VccQ: disabling
[ 7.477316] SDHI3 VccQ: disabling
[ 7.480632] ALSA device list:
[ 7.483598] No soundcards found.
[ 7.492496] VFS: Mounted root (nfs filesystem) on device 0:19.
[ 7.498742] devtmpfs: mounted
[ 7.504263] Freeing unused kernel memory: 4992K
[ 7.513642] Run /sbin/init as init process
[ 7.843871] Unable to handle kernel paging request at virtual address 0000000056000000
[ 7.851797] Mem abort info:
[ 7.854589] ESR = 0x96000004
[ 7.857642] EC = 0x25: DABT (current EL), IL = 32 bits
[ 7.862950] SET = 0, FnV = 0
[ 7.866001] EA = 0, S1PTW = 0
[ 7.869134] Data abort info:
[ 7.872011] ISV = 0, ISS = 0x00000004
[ 7.875842] CM = 0, WnR = 0
[ 7.878806] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000774787000
[ 7.885242] [0000000056000000] pgd=0000000000000000
[ 7.890119] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 7.895684] Modules linked in:
[ 7.898737] CPU: 2 PID: 1 Comm: systemd Not tainted 5.3.0-rc6-next-20190902-00001-g9709468 #48
[ 7.907340] Hardware name: Renesas Salvator-X board based on r8a7795 ES2.0+ (DT)
[ 7.914729] pstate: 20000005 (nzCv daif -PAN -UAO)
[ 7.919523] pc : dput+0x38/0x2e8
[ 7.922743] lr : dput+0x34/0x2e8
[ 7.925964] sp : ffff80001006bba0
[ 7.929270] x29: ffff80001006bba0 x28: ffff000735c98000
[ 7.934576] x27: 0000000000000000 x26: 0000000000000000
[ 7.939881] x25: 0000000056000000 x24: 0000000000004000
[ 7.945186] x23: 0000000000000001 x22: 0000000000080060
[ 7.950491] x21: 0000000000080040 x20: 0000000056000058
[ 7.955795] x19: 0000000056000000 x18: 0000000000000000
[ 7.961099] x17: 0000000000000000 x16: 0000000000000000
[ 7.966403] x15: 0000000000000000 x14: 0000000000000000
[ 7.971707] x13: 0000000000000000 x12: fefefefefefefeff
[ 7.977011] x11: 0000ffffa01018b8 x10: 0000ffffa01018b8
[ 7.982315] x9 : 6bff3a3a375c19ff x8 : 00ffffa01018b800
[ 7.987620] x7 : 0000000000000000 x6 : 0000000000000000
[ 7.992924] x5 : 0000000000000064 x4 : 0000000c00000000
[ 7.998228] x3 : 0000000000000001 x2 : 0000000000000082
[ 8.003532] x1 : ffff000735c98000 x0 : 0000000000000001
[ 8.008838] Call trace:
[ 8.011278] dput+0x38/0x2e8
[ 8.014155] terminate_walk+0xf4/0x120
[ 8.017897] path_lookupat+0xf8/0x1f8
[ 8.021553] filename_lookup+0x8c/0x160
[ 8.025382] user_path_at_empty+0x48/0x58
[ 8.029387] __arm64_sys_name_to_handle_at+0x64/0x2d0
[ 8.034435] el0_svc_common+0x68/0x178
[ 8.038177] el0_svc_handler+0x24/0x98
[ 8.041920] el0_svc+0x8/0xc
[ 8.044798] Code: 72a00115 52800037 97fb26b4 91016274 (b9400260)
[ 8.050895] ---[ end trace dd06490ec981282b ]---
[ 8.055966] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[ 8.063619] SMP: stopping secondary CPUs
[ 8.067539] Kernel Offset: disabled
[ 8.071021] CPU features: 0x0002,21006004
[ 8.075022] Memory Limit: none
[ 8.078076] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---

Best regards,
Yoshihiro Shimoda

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