Re: KVM guest sometimes failed to boot because of kernel stack overflow if KPTI is enabled on a hisilicon ARM64 platform.

From: Wei Xu
Date: Tue Jun 26 2018 - 13:17:01 EST

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Hi All,

On 2018/6/21 17:20, Wei Xu wrote:

Hi James,

On 2018/6/21 9:38, James Morse wrote:

Hi Will, Wei,

On 20/06/18 17:25, Wei Xu wrote:

On 2018/6/20 23:54, James Morse wrote:
I have disabled CONFIG_ARM64_RAS_EXTN and reverted that commit.
But I still got the stack overflow issue sometimes.
Do you have more hint?
The log is as below:
[ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x480fd010]
[ 0.000000] Linux version 4.17.0-45865-g2b31fe7-dirty

Could you reproduce this with v4.17? This says there are ~45,000 extra patches,
and un-committed changes. None of the hashes so far have been commits in
mainline, so we have no idea what this tree is.

I have tried v4.17 and log is as below and also it can be found in the first mail
of this thread.

[ 0.000000] Linux version 4.17.0-45864-g29dcea8-dirty
(joyx@Turing-Arch-b) (gcc version 4.9.1 20140505 (prerelease) (crosstool-NG
linaro-1.13.1-4.9-2014.05 - Linaro GCC 4.9-2014.05)) #6 SMP PREEMPT Fri Jun
15 21:39:52 CST 2018

I will try v4.17.2 and v4.18-rc1.

(joyx@Turing-Arch-b) (gcc version 4.9.1 20140505 (prerelease) (crosstool-NG
linaro-1.13.1-4.9-2014.05 - Linaro GCC 4.9-2014.05)) #10 SMP PREEMPT Wed Jun 20
23:59:05 CST 2018
[ 0.000000] CPU0: using LPI pending table @0x000000007d860000
[ 0.000000] GIC: PPI11 is secure or misconfigured
[ 0.000000] arch_timer: WARNING: Invalid trigger for IRQ3, assuming level
low
[ 0.000000] arch_timer: WARNING: Please fix your firmware
[ 0.000000] arch_timer: cp15 timer(s) running at 100.00MHz (virt).

(No idea what these mean, but I doubt they are relevant)

I will try with mainline qemu 2.12.0.

Thanks!

Today I tried the kernel 4.18-rc2(defconfig, no change on top) with qemu 2.12.0.
The guest sometimes still failed to boot. But the crash reason is different.
Could you please share any hint?
Thanks!

The guest boot log is as below:
===========================

estuary:/$ ./qemu-system-aarch64 -machine virt,kernel_irqchip=on,gic-v
ersion=3 -cpu host -enable-kvm -smp 1 -m 1024 -kernel ./Image-4.18-joyx -initrd
../mini-rootfs-arm64.cpio.gz -nographic -append "rdinit=init console=ttyAMA0 ear
lycon=pl011,0x9000000"

[ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x480fd010]
[ 0.000000] Linux version 4.18.0-rc2-58583-g7daf201-dirty (joyx@Turing-Arch-b) (gcc version 4.9.1 20140505 (prerelease) (crosstool-NG linaro-1.13.1-4.9-2014.05 - Linaro GCC 4.9-2014.05)) #20 SMP PREEMPT Tue Jun 26 23:43:35 CST 2018
[ 0.000000] Machine model: linux,dummy-virt
[ 0.000000] earlycon: pl11 at MMIO 0x0000000009000000 (options '')
[ 0.000000] bootconsole [pl11] enabled
[ 0.000000] efi: Getting EFI parameters from FDT:
[ 0.000000] efi: UEFI not found.
[ 0.000000] cma: Reserved 32 MiB at 0x000000007e000000
[ 0.000000] NUMA: No NUMA configuration found
[ 0.000000] NUMA: Faking a node at [mem 0x0000000000000000-0x000000007fffffff]
[ 0.000000] NUMA: NODE_DATA [mem 0x7dfe9a00-0x7dfeb1bf]
[ 0.000000] Zone ranges:
[ 0.000000] DMA32 [mem 0x0000000040000000-0x000000007fffffff]
[ 0.000000] Normal empty
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000040000000-0x000000007fffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000040000000-0x000000007fffffff]
[ 0.000000] psci: probing for conduit method from DT.
[ 0.000000] psci: PSCIv1.0 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] random: get_random_bytes called from start_kernel+0xa8/0x418 with crng_init=0
[ 0.000000] percpu: Embedded 23 pages/cpu @(____ptrval____) s56064 r8192 d29952 u94208
[ 0.000000] Detected VIPT I-cache on CPU0
[ 0.000000] CPU features: detected: Kernel page table isolation (KPTI)
[ 0.000000] CPU features: detected: Hardware dirty bit management
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 258048
[ 0.000000] Policy zone: DMA32
[ 0.000000] Kernel command line: rdinit=init console=ttyAMA0 earlycon=pl011,0x9000000
[ 0.000000] Memory: 951780K/1048576K available (10172K kernel code, 1362K rwdata, 4956K rodata, 1216K init, 392K bss, 64028K reserved, 32768K cma-reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] Preemptible hierarchical RCU implementation.
[ 0.000000] RCU restricting CPUs from NR_CPUS=128 to nr_cpu_ids=1.
[ 0.000000] Tasks RCU enabled.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[ 0.000000] GICv3: Distributor has no Range Selector support
[ 0.000000] GICv3: no VLPI support, no direct LPI support
[ 0.000000] ITS [mem 0x08080000-0x0809ffff]
[ 0.000000] ITS@0x0000000008080000: allocated 8192 Devices @7c830000 (indirect, esz 8, psz 64K, shr 1)
[ 0.000000] ITS@0x0000000008080000: allocated 8192 Interrupt Collections @7c840000 (flat, esz 8, psz 64K, shr 1)
[ 0.000000] GIC: using LPI property table @0x000000007c850000
[ 0.000000] ITS: Allocated 1792 chunks for LPIs
[ 0.000000] GICv3: CPU0: found redistributor 0 region 0:0x00000000080a0000
[ 0.000000] CPU0: using LPI pending table @0x000000007c860000
[ 0.000000] arch_timer: cp15 timer(s) running at 100.00MHz (virt).
[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x171024e7e0, max_idle_ns: 440795205315 ns
[ 0.000001] sched_clock: 56 bits at 100MHz, resolution 10ns, wraps every 4398046511100ns
[ 0.000828] Console: colour dummy device 80x25
[ 0.001279] Calibrating delay loop (skipped), value calculated using timer frequency.. 200.00 BogoMIPS (lpj=400000)
[ 0.002307] pid_max: default: 32768 minimum: 301
[ 0.002925] Security Framework initialized
[ 0.003494] Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes)
[ 0.004277] Inode-cache hash table entries: 65536 (order: 7, 524288 bytes)
[ 0.004968] Mount-cache hash table entries: 2048 (order: 2, 16384 bytes)
[ 0.005628] Mountpoint-cache hash table entries: 2048 (order: 2, 16384 bytes)
[ 0.031117] ASID allocator initialised with 32768 entries
[ 0.035124] Hierarchical SRCU implementation.
[ 0.039492] Platform MSI: its domain created
[ 0.039934] PCI/MSI: /intc/its domain created
[ 0.040509] EFI services will not be available.
[ 0.043153] smp: Bringing up secondary CPUs ...
[ 0.043606] smp: Brought up 1 node, 1 CPU
[ 0.044000] SMP: Total of 1 processors activated.
[ 0.044464] CPU features: detected: GIC system register CPU interface
[ 0.045112] CPU features: detected: Privileged Access Never
[ 0.045658] CPU features: detected: User Access Override
[ 0.046177] CPU features: detected: RAS Extension Support
[ 0.048119] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000288
[ 0.048991] Mem abort info:
[ 0.049267] ESR = 0x96000004
[ 0.049567] Exception class = DABT (current EL), IL = 32 bits
[ 0.050146] SET = 0, FnV = 0
[ 0.050446] EA = 0, S1PTW = 0
[ 0.050754] Data abort info:
[ 0.051038] ISV = 0, ISS = 0x00000004
[ 0.051921] CM = 0, WnR = 0
[ 0.054936] [0000000000000288] user address but active_mm is swapper
[ 0.061427] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 0.067080] Modules linked in:
[ 0.070206] CPU: 0 PID: 13 Comm: migration/0 Not tainted 4.18.0-rc2-58583-g7daf201-dirty #20
[ 0.078745] Hardware name: linux,dummy-virt (DT)
[ 0.083433] pstate: 60400085 (nZCv daIf +PAN -UAO)
[ 0.088258] pc : kpti_install_ng_mappings+0x154/0x214
[ 0.093319] lr : kpti_install_ng_mappings+0x120/0x214
[ 0.098483] sp : ffff0000093fbce0
[ 0.101854] x29: ffff0000093fbce0 x28: ffff000008ee5000
[ 0.107263] x27: ffff000008ee5000 x26: ffff00000923b000
[ 0.112568] x25: ffff0000090ac000 x24: ffff0000091d9000
[ 0.117983] x23: ffff000008ee5000 x22: 00000000411d8000
[ 0.123392] x21: ffff00000923b000 x20: 0000000000000000
[ 0.128801] x19: ffff0000091d8000 x18: 000000003455d99d
[ 0.134209] x17: 0000000000000001 x16: 00f8000040ffff13
[ 0.139513] x15: 000000007dff5000 x14: 000000007dff5000
[ 0.144920] x13: 00f800007fe00f11 x12: 000000007dff7000
[ 0.150329] x11: 000000007dff7000 x10: 0000000000000000
[ 0.155633] x9 : 000000007dff8000 x8 : 000000007dff8000
[ 0.161042] x7 : 0000000000000000 x6 : 000000004123c000
[ 0.166451] x5 : 000000004123c000 x4 : 0000000040a5f3d4
[ 0.171860] x3 : 0000000000000000 x2 : 000000004123b000
[ 0.177163] x1 : ffff0000090acd88 x0 : ffff80003ca627c0
[ 0.182577] Process migration/0 (pid: 13, stack limit = 0x(____ptrval____))
[ 0.189561] Call trace:
[ 0.192081] kpti_install_ng_mappings+0x154/0x214
[ 0.196892] Code: d503201f d503379f d5033fdf f94033a3 (f9414460)
[ 0.203029] ---[ end trace 3ca968ef0a151b33 ]---
[ 0.207722] note: migration/0[13] exited with preempt_count 1
[ 0.213610] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[ 0.222393] Mem abort info:
[ 0.225273] ESR = 0x86000004
[ 0.228396] Exception class = IABT (current EL), IL = 32 bits
[ 0.234405] SET = 0, FnV = 0
[ 0.237527] EA = 0, S1PTW = 0
[ 0.240769] [0000000000000000] user address but active_mm is swapper
[ 0.247149] Internal error: Oops: 86000004 [#2] PREEMPT SMP
[ 0.252797] Modules linked in:
[ 0.255922] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G D 4.18.0-rc2-58583-g7daf201-dirty #20
[ 0.265549] Hardware name: linux,dummy-virt (DT)
[ 0.270235] pstate: 60400085 (nZCv daIf +PAN -UAO)
[ 0.275155] pc : (null)
[ 0.278520] lr : (null)
[ 0.281886] sp : ffff00000802bb10
[ 0.285257] x29: 0000000000000000 x28: 0000000000000080
[ 0.290664] x27: ffff000008a82000 x26: ffff000008a52134
[ 0.296073] x25: ffff000009089000 x24: ffff80003ca30570
[ 0.301381] x23: ffff000009064000 x22: ffff0000090acd88
[ 0.306789] x21: ffff80003ca30000 x20: 0000000000000000
[ 0.312196] x19: 0000000000000000 x18: 000000000000000e
[ 0.317503] x17: 0000000000000001 x16: 0000000000000019
[ 0.322910] x15: 0000000000000033 x14: 000000000000004c
[ 0.328317] x13: 0000000000000068 x12: ffff0000093fb7f8
[ 0.333725] x11: 0000000000000108 x10: 0000000000000940
[ 0.339028] x9 : ffff00000802baf0 x8 : ffff80003ca309a0
[ 0.344434] x7 : 0000000000000000 x6 : 0000000000000000
[ 0.349842] x5 : 0000000002da3744 x4 : 0000000000000080
[ 0.355250] x3 : 0000000000000008 x2 : 0000800034f69000
[ 0.360554] x1 : ffff80003ca30000 x0 : ffff80003ca627c0
[ 0.365959] Process swapper/0 (pid: 1, stack limit = 0x(____ptrval____))
[ 0.372801] Call trace:
[ 0.375322] Code: bad PC value
[ 0.378347] ---[ end trace 3ca968ef0a151b34 ]---

The faddr2line result is as :
========================

./scripts/faddr2line ../kernel-dev.build/vmlinux kpti_install_ng_mappings+0x150/0x214
kpti_install_ng_mappings+0x150/0x214:
__cpu_set_tcr_t0sz at arch/arm64/include/asm/mmu_context.h:94
(inlined by) cpu_uninstall_idmap at arch/arm64/include/asm/mmu_context.h:125
(inlined by) kpti_install_ng_mappings at arch/arm64/kernel/cpufeature.c:921

The assembler of kpti_install_ng_mappings is as:
=============================================

Dump of assembler code for function kpti_install_ng_mappings:
0xffff000008091f7c <+0>: stp x29, x30, [sp,#-112]!
0xffff000008091f80 <+4>: adrp x0, 0xffff000009064000 <bp_hardening_data>
0xffff000008091f84 <+8>: mov x29, sp
0xffff000008091f88 <+12>: stp x23, x24, [sp,#48]
0xffff000008091f8c <+16>: adrp x24, 0xffff0000091d9000 <reset_devices>
0xffff000008091f90 <+20>: add x0, x0, #0x18
0xffff000008091f94 <+24>: add x1, x24, #0x550
0xffff000008091f98 <+28>: stp x19, x20, [sp,#16]
0xffff000008091f9c <+32>: stp x21, x22, [sp,#32]
0xffff000008091fa0 <+36>: stp x25, x26, [sp,#64]
0xffff000008091fa4 <+40>: stp x27, x28, [sp,#80]
0xffff000008091fa8 <+44>: mrs x2, tpidr_el1
0xffff000008091fac <+48>: ldrb w1, [x1,#8]
0xffff000008091fb0 <+52>: ldr w20, [x2,x0]
0xffff000008091fb4 <+56>: cbnz w1, 0xffff00000809212c <kpti_install_ng_mappings+432>
0xffff000008091fb8 <+60>: adrp x27, 0xffff000008ee5000 <sve_vq_map+32>
0xffff000008091fbc <+64>: adrp x19, 0xffff0000091d8000 <empty_zero_page>
0xffff000008091fc0 <+68>: add x19, x19, #0x0
0xffff000008091fc4 <+72>: adrp x1, 0xffff000008a5f000 <kimage_vaddr>
0xffff000008091fc8 <+76>: mov x0, x19
0xffff000008091fcc <+80>: add x1, x1, #0x3d8
0xffff000008091fd0 <+84>: ldr x2, [x27,#1176]
0xffff000008091fd4 <+88>: sub x4, x1, x2
0xffff000008091fd8 <+92>: sub x0, x0, x2
0xffff000008091fdc <+96>: msr ttbr0_el1, x0
0xffff000008091fe0 <+100>: isb
0xffff000008091fe4 <+104>: dsb nshst
0xffff000008091fe8 <+108>: tlbi vmalle1
0xffff000008091fec <+112>: nop
0xffff000008091ff0 <+116>: nop
0xffff000008091ff4 <+120>: dsb nsh
0xffff000008091ff8 <+124>: isb
0xffff000008091ffc <+128>: adrp x3, 0xffff000009096000 <early_node_cpu_hwid+1440>
0xffff000008092000 <+132>: ldr x0, [x3,#648]
0xffff000008092004 <+136>: cmp x0, #0x10
0xffff000008092008 <+140>: b.ne 0xffff000008092178 <kpti_install_ng_mappings+508>
0xffff00000809200c <+144>: adrp x28, 0xffff000008ee5000 <sve_vq_map+32>
0xffff000008092010 <+148>: ldr x2, [x27,#1176]
0xffff000008092014 <+152>: adrp x1, 0xffff000009237000
0xffff000008092018 <+156>: adrp x26, 0xffff00000923b000
0xffff00000809201c <+160>: add x1, x1, #0x0
0xffff000008092020 <+164>: add x21, x26, #0x0
0xffff000008092024 <+168>: ldr x0, [x28,#1160]
0xffff000008092028 <+172>: adrp x23, 0xffff000008ee5000 <sve_vq_map+32>
0xffff00000809202c <+176>: sub x1, x1, x2
0xffff000008092030 <+180>: sub x1, x1, x0
0xffff000008092034 <+184>: orr x0, x1, #0xffff800000000000
0xffff000008092038 <+188>: cmp x0, x21
0xffff00000809203c <+192>: b.eq 0xffff000008092174 <kpti_install_ng_mappings+504>
0xffff000008092040 <+196>: mov x22, x19
0xffff000008092044 <+200>: str x3, [x29,#96]
0xffff000008092048 <+204>: str x4, [x29,#104]
0xffff00000809204c <+208>: sub x2, x22, x2
0xffff000008092050 <+212>: msr ttbr0_el1, x2
0xffff000008092054 <+216>: isb
0xffff000008092058 <+220>: ldr x0, [x28,#1160]
---Type <return> to continue, or q <return> to quit---
0xffff00000809205c <+224>: and x1, x1, #0x7fffffffffff
0xffff000008092060 <+228>: adrp x25, 0xffff0000090ac000 <perf_cpu_clock+200>
0xffff000008092064 <+232>: add x0, x1, x0
0xffff000008092068 <+236>: add x1, x25, #0xd88
0xffff00000809206c <+240>: bl 0xffff0000080a0750 <cpu_do_switch_mm>
0xffff000008092070 <+244>: adrp x0, 0xffff000009089000 <page_wait_table+5376>
0xffff000008092074 <+248>: mov w1, #0x80 // #128
0xffff000008092078 <+252>: add x0, x0, #0xb48
0xffff00000809207c <+256>: bl 0xffff0000083e8144 <__bitmap_weight>
0xffff000008092080 <+260>: mov w1, w0
0xffff000008092084 <+264>: ldr x5, [x23,#1176]
0xffff000008092088 <+268>: mov w0, w20
0xffff00000809208c <+272>: ldr x4, [x29,#104]
0xffff000008092090 <+276>: mov x2, x21
0xffff000008092094 <+280>: sub x2, x2, x5
0xffff000008092098 <+284>: blr x4
0xffff00000809209c <+288>: ldr x1, [x23,#1176]
0xffff0000080920a0 <+292>: mrs x0, sp_el0
0xffff0000080920a4 <+296>: sub x22, x22, x1
0xffff0000080920a8 <+300>: ldr x1, [x0,#936]
0xffff0000080920ac <+304>: msr ttbr0_el1, x22
0xffff0000080920b0 <+308>: isb
0xffff0000080920b4 <+312>: dsb nshst
0xffff0000080920b8 <+316>: tlbi vmalle1
0xffff0000080920bc <+320>: nop
0xffff0000080920c0 <+324>: nop
0xffff0000080920c4 <+328>: dsb nsh
0xffff0000080920c8 <+332>: isb
0xffff0000080920cc <+336>: ldr x3, [x29,#96]
0xffff0000080920d0 <+340>: ldr x0, [x3,#648]
0xffff0000080920d4 <+344>: cmp x0, #0x10
0xffff0000080920d8 <+348>: b.ne 0xffff00000809215c <kpti_install_ng_mappings+480>
0xffff0000080920dc <+352>: add x25, x25, #0xd88
0xffff0000080920e0 <+356>: cmp x1, x25
0xffff0000080920e4 <+360>: b.eq 0xffff00000809211c <kpti_install_ng_mappings+416>
0xffff0000080920e8 <+364>: ldr x2, [x1,#64]
0xffff0000080920ec <+368>: add x26, x26, #0x0
0xffff0000080920f0 <+372>: cmp x2, x26
0xffff0000080920f4 <+376>: b.eq 0xffff000008092174 <kpti_install_ng_mappings+504>
0xffff0000080920f8 <+380>: ldr x0, [x27,#1176]
0xffff0000080920fc <+384>: sub x19, x19, x0
0xffff000008092100 <+388>: msr ttbr0_el1, x19
0xffff000008092104 <+392>: isb
0xffff000008092108 <+396>: tbz x2, #47, 0xffff000008092148 <kpti_install_ng_mappings+460>
0xffff00000809210c <+400>: ldr x0, [x28,#1160]
0xffff000008092110 <+404>: and x2, x2, #0x7fffffffffff
0xffff000008092114 <+408>: add x0, x2, x0
0xffff000008092118 <+412>: bl 0xffff0000080a0750 <cpu_do_switch_mm>
0xffff00000809211c <+416>: cbnz w20, 0xffff00000809212c <kpti_install_ng_mappings+432>
0xffff000008092120 <+420>: add x24, x24, #0x550
0xffff000008092124 <+424>: mov w0, #0x1 // #1
0xffff000008092128 <+428>: strb w0, [x24,#8]
0xffff00000809212c <+432>: ldp x19, x20, [sp,#16]
0xffff000008092130 <+436>: ldp x21, x22, [sp,#32]
0xffff000008092134 <+440>: ldp x23, x24, [sp,#48]
0xffff000008092138 <+444>: ldp x25, x26, [sp,#64]
0xffff00000809213c <+448>: ldp x27, x28, [sp,#80]
---Type <return> to continue, or q <return> to quit---
0xffff000008092140 <+452>: ldp x29, x30, [sp],#112
0xffff000008092144 <+456>: ret
0xffff000008092148 <+460>: adrp x0, 0xffff000008ee5000 <sve_vq_map+32>
0xffff00000809214c <+464>: ldr x0, [x0,#1176]
0xffff000008092150 <+468>: sub x0, x2, x0
0xffff000008092154 <+472>: bl 0xffff0000080a0750 <cpu_do_switch_mm>
0xffff000008092158 <+476>: b 0xffff00000809211c <kpti_install_ng_mappings+416>
0xffff00000809215c <+480>: mrs x0, tcr_el1
0xffff000008092160 <+484>: and x0, x0, #0xffffffffffffffc0
0xffff000008092164 <+488>: orr x0, x0, #0x10
0xffff000008092168 <+492>: msr tcr_el1, x0
0xffff00000809216c <+496>: isb
0xffff000008092170 <+500>: b 0xffff0000080920dc <kpti_install_ng_mappings+352>
0xffff000008092174 <+504>: brk #0x800
0xffff000008092178 <+508>: mrs x1, tcr_el1
0xffff00000809217c <+512>: and x1, x1, #0xffffffffffffffc0
0xffff000008092180 <+516>: orr x0, x1, x0
0xffff000008092184 <+520>: msr tcr_el1, x0
0xffff000008092188 <+524>: isb
0xffff00000809218c <+528>: b 0xffff00000809200c <kpti_install_ng_mappings+144>
End of assembler dump.

Best Regards,
Wei

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