Re: [PATCH] irqdomain: remove debugfs_file from struct irq_domain

From: Michael Walle
Date: Thu Feb 18 2021 - 05:06:06 EST

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In reply to: Greg KH: "Re: [PATCH] irqdomain: remove debugfs_file from struct irq_domain"
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Am 2021-02-18 09:40, schrieb Greg KH:

On Wed, Feb 17, 2021 at 08:57:17PM +0100, Michael Walle wrote:

Hi Greg,

> There's no need to keep around a dentry pointer to a simple file that
> debugfs itself can look up when we need to remove it from the system.
> So simplify the code by deleting the variable and cleaning up the logic
> around the debugfs file.

This will generate the following oops on my board (arm64,
freescale/fsl-ls1028a-kontron-sl28-var3-ads2.dts). In debugfs_lookup()
debugfs_mount is NULL.

[ 0.000000] Linux version 5.11.0-next-20210217-00014-g41e0e92a2d05 (mwalle@mwalle01) (aarch64-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #69 SMP PREEMPT Wed Feb 17 20:47:10 CET 2021
[..]
[ 0.000000] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[ 0.000000] Mem abort info:
[ 0.000000] ESR = 0x96000004

<snip>

Back to this log, do you see:
"Unable to pin filesystem for file "
anywhere before this crash?

No.

Here is the complete log:

[ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd083]
[ 0.000000] Linux version 5.11.0-next-20210217-00013-g960bc30321c0-dirty (mwalle@mwalle01) (aarch64-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #73 SMP PREEMPT Thu Feb 18 09:19:21 CET 2021
[ 0.000000] Machine model: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier
[ 0.000000] efi: UEFI not found.
[ 0.000000] earlycon: ns16550a0 at MMIO 0x00000000021c0500 (options '115200n8')
[ 0.000000] printk: bootconsole [ns16550a0] enabled
[ 0.000000] NUMA: No NUMA configuration found
[ 0.000000] NUMA: Faking a node at [mem 0x0000000080000000-0x00000020ffffffff]
[ 0.000000] NUMA: NODE_DATA [mem 0x20ff7d9200-0x20ff7dafff]
[ 0.000000] Zone ranges:
[ 0.000000] DMA [mem 0x0000000000000000-0x00000000ffffffff]
[ 0.000000] DMA32 empty
[ 0.000000] Normal [mem 0x0000000100000000-0x00000020ffffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000080000000-0x00000000ffffffff]
[ 0.000000] node 0: [mem 0x0000002080000000-0x00000020ffffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000080000000-0x00000020ffffffff]
[ 0.000000] On node 0 totalpages: 1048576
[ 0.000000] DMA zone: 8192 pages used for memmap
[ 0.000000] DMA zone: 0 pages reserved
[ 0.000000] DMA zone: 524288 pages, LIFO batch:63
[ 0.000000] Normal zone: 8192 pages used for memmap
[ 0.000000] Normal zone: 524288 pages, LIFO batch:63
[ 0.000000] cma: Reserved 32 MiB at 0x00000000fcc00000
[ 0.000000] percpu: Embedded 31 pages/cpu s89752 r8192 d29032 u126976
[ 0.000000] pcpu-alloc: s89752 r8192 d29032 u126976 alloc=31*4096
[ 0.000000] pcpu-alloc: [0] 0 [0] 1
[ 0.000000] Detected PIPT I-cache on CPU0
[ 0.000000] CPU features: detected: GIC system register CPU interface
[ 0.000000] CPU features: detected: Spectre-v3a
[ 0.000000] CPU features: detected: Spectre-v2
[ 0.000000] CPU features: detected: Spectre-v4
[ 0.000000] CPU features: detected: ARM errata 1165522, 1319367, or 1530923
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 1032192
[ 0.000000] Policy zone: Normal
[ 0.000000] Kernel command line: debug root=/dev/mmcblk0p2 rootwait earlycon
[ 0.000000] Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes, linear)
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] software IO TLB: mapped [mem 0x00000000f8c00000-0x00000000fcc00000] (64MB)
[ 0.000000] Memory: 3986440K/4194304K available (14912K kernel code, 2164K rwdata, 5876K rodata, 4864K init, 849K bss, 175096K reserved, 32768K cma-reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
[ 0.000000] ftrace: allocating 52190 entries in 204 pages
[ 0.000000] ftrace: allocated 204 pages with 4 groups
[ 0.000000] rcu: Preemptible hierarchical RCU implementation.
[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=256 to nr_cpu_ids=2.
[ 0.000000] Trampoline variant of Tasks RCU enabled.
[ 0.000000] Rude variant of 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=2
[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[ 0.000000] GICv3: GIC: Using split EOI/Deactivate mode
[ 0.000000] GICv3: 256 SPIs implemented
[ 0.000000] GICv3: 0 Extended SPIs implemented
[ 0.000000] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[ 0.000000] Mem abort info:
[ 0.000000] ESR = 0x96000004
[ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits
[ 0.000000] SET = 0, FnV = 0
[ 0.000000] EA = 0, S1PTW = 0
[ 0.000000] Data abort info:
[ 0.000000] ISV = 0, ISS = 0x00000004
[ 0.000000] CM = 0, WnR = 0
[ 0.000000] [0000000000000000] user address but active_mm is swapper
[ 0.000000] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 0.000000] Modules linked in:
[ 0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-next-20210217-00013-g960bc30321c0-dirty #73
[ 0.000000] Hardware name: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier (DT)
[ 0.000000] pstate: 00000085 (nzcv daIf -PAN -UAO -TCO BTYPE=--)
[ 0.000000] pc : debugfs_lookup+0x5c/0x94
[ 0.000000] lr : debugfs_lookup+0x3c/0x94
[ 0.000000] sp : ffff800011933ca0
[ 0.000000] x29: ffff800011933ca0 x28: 0000000000000000
[ 0.000000] x27: 0000000000000000 x26: 0000000000000001
[ 0.000000] x25: ffff00200016f100 x24: ffff800010f19750
[ 0.000000] x23: ffff80001193d000 x22: ffff800011939948
[ 0.000000] x21: ffff8000119cbcc8 x20: 0000000000000000
[ 0.000000] x19: ffff00200016f200 x18: 0000000000000010
[ 0.000000] x17: 0000000000007fff x16: 00000000ffffffff
[ 0.000000] x15: ffffffffffffffff x14: ffff800011939948
[ 0.000000] x13: ffff8000919339a7 x12: ffff8000119cb670
[ 0.000000] x11: 0000000000000003 x10: ffff8000119b3630
[ 0.000000] x9 : ffff800010102bc4 x8 : 0000000000017fe8
[ 0.000000] x7 : c0000000ffffefff x6 : 0000000000000001
[ 0.000000] x5 : 0000000000000000 x4 : 0000000000000000
[ 0.000000] x3 : 00000000ffffffff x2 : 0000000000000000
[ 0.000000] x1 : 0000000000000000 x0 : 0000000000000000
[ 0.000000] Call trace:
[ 0.000000] debugfs_lookup+0x5c/0x94
[ 0.000000] debugfs_remove_domain_dir+0x24/0x38
[ 0.000000] irq_domain_update_bus_token+0x6c/0xb8
[ 0.000000] gic_init_bases+0x19c/0x64c
[ 0.000000] gic_of_init+0x188/0x228
[ 0.000000] of_irq_init+0x1a8/0x350
[ 0.000000] irqchip_init+0x20/0x48
[ 0.000000] init_IRQ+0xd4/0x178
[ 0.000000] start_kernel+0x628/0x85c
[ 0.000000] 0x0
[ 0.000000] Code: 540001a8 b5000094 b0006ca0 f947d000 (f9400014)
[ 0.000000] random: get_random_bytes called from print_oops_end_marker+0x34/0x60 with crng_init=0
[ 0.000000] ---[ end trace 0000000000000000 ]---
[ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
[ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---

-michael

Next message: Viresh Kumar: "Re: [PATCH] cpufreq: exclude boost frequencies from valid count if not enabled"
Previous message: Christoph Hellwig: "Re: [PATCH v5 3/8] x86/mm/tlb: Open-code on_each_cpu_cond_mask() for tlb_is_not_lazy()"
In reply to: Greg KH: "Re: [PATCH] irqdomain: remove debugfs_file from struct irq_domain"
Next in thread: irqchip-bot for Greg Kroah-Hartman: "[irqchip: irq/irqchip-next] irqdomain: Remove debugfs_file from struct irq_domain"
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