selftests: arm64: fp-stress: Unable to handle kernel paging request at virtual address

Naresh Kamboju naresh.kamboju at linaro.org
Tue Nov 7 05:13:25 PST 2023 

Following kernel oops noticed while running kselftests arm64 on qemu-arm64
on stable-rc linux-6.6.y branch.

I have re-built vmlinux with the same config and ran decode stackdump.

Reported-by: Linux Kernel Functional Testing <lkft at linaro.org>

Logs:
====
# selftests: arm64: fp-stress
# TAP version 13
# 1..32
# # 2 CPUs, 5 SVE VLs, 5 SME VLs, SME2 absent
# # Will run for 10s
# # Started FPSIMD-0-0
<>
# # SVE-VL-64-0: Expected
[3904000039044000390480003904c0003904000139044001390480013904c0013904000239044002390480023904c0023904000339044003390480033904c003]
<>
# # Finishing up...
# # SSVE-VL-16-0: Terminated by signal 15, no error, iterations=50467, signals=9
# # SVE-VL-16-0: Terminated by signal 15, no error, iterations=56669, signals=9
# # FPSIMD-1-0: Terminated by signal 15, no error, iterations=20632, signals=10
# # FPSIMD-0-0: Terminated by signal 15, no error, iterations=21549, signals=9
# # SSVE-VL-16-1: Terminated by signal 15, no error, iterations=49077,
signals=10
# # ZA-VL-16-0: Terminated by signal 15, no error, iterations=24878, signals=9
# # ZA-VL-16-1: Terminated by signal 15, no error, iterations=22452, signals=10
# # SVE-VL-16-1: Terminated by signal 15, no error, iterations=49039, signals=10
# ok 1 FPSIMD-0-0
# # SVE-VL-256-<1>[   88.160313] Unable to handle kernel paging
request at virtual address 00550f0344550f02
<1>[   88.161949] Mem abort info:
<1>[   88.162574]   ESR = 0x0000000096000004
<1>[   88.163283]   EC = 0x25: DABT (current EL), IL = 32 bits
<1>[   88.164330]   SET = 0, FnV = 0
<1>[   88.164930]   EA = 0, S1PTW = 0
<1>[   88.165854]   FSC = 0x04: level 0 translation fault
<1>[   88.166852] Data abort info:
<1>[   88.167463]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
<1>[   88.168566]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
<1>[   88.169558]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
<1>[   88.170580] [00550f0344550f02] address between user and kernel
address ranges
<0>[   88.172317] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
<4>[   88.173833] Modules linked in: crct10dif_ce sm3_ce sm3 sha3_ce
sha512_ce sha512_arm64 fuse drm backlight dm_mod ip_tables x_tables
<4>[   88.177601] CPU: 1 PID: 1 Comm: systemd Not tainted 6.6.1-rc1 #1
0<4>[   88.178992] Hardware name: linux,dummy-virt (DT)
<4>[   88.180334] pstate: 224000c9 (nzCv daIF +PAN -UAO +TCO -DIT
-SSBS BTYPE=--)
<4>[ 88.181149] pc : percpu_ref_get_many
(include/linux/percpu-refcount.h:174 (discriminator 2)
include/linux/percpu-refcount.h:204 (discriminator 2))
<4>[ 88.182885] lr : percpu_ref_get_many
(include/linux/percpu-refcount.h:174 (discriminator 2)
include/linux/percpu-refcount.h:204 (discriminator 2))
<4>[   88.183621] sp : ffff80008000bd80
<4>[   88.184039] x29: ffff80008000bd80 x28: ffff0000c02c8000 x27:
000000000000000a
<4>[   88.185245] x26: 0000000000000000 x25: 0000000000000002 x24:
0000000000000000
<4>[   88.187718] x23: ffff0000c2306f40 x22: 0000000000000000 x21:
44550f0344550f02
<4>[   88.188696] x20: 44550f0344550f02 x19: 0000000000000001 x18:
0000000000000000
<4>[   88.189556] x17: ffff436cf77c7000 x16: ffff800080008000 x15:
0000000000000000
<4>[   88.190568] x14: 0000000000000000 x13: ffff0000c2290026 x12:
ffff80008002bcb4
<4>[   88.191589] x11: 0000000000000040 x10: ffff0000c00ea0a8 x9 :
ffffbc9405d93864
<4>[   88.192573] x8 : ffff80008000bcd8 x7 : ffff0000c09fe000 x6 :
ffff436cf77c7000
<4>[   88.193523] x5 : ffff80008000bd40 x4 : fffffffffffffef8 x3 :
0000000000000040
<4>[   88.194472] x2 : 0000000000000002 x1 : ffff0000c02c8000 x0 :
0000000000000001
<4>[   88.195706] Call trace:
<4>[ 88.196098] percpu_ref_get_many
(include/linux/percpu-refcount.h:174 (discriminator 2)
include/linux/percpu-refcount.h:204 (discriminator 2))
<4>[ 88.196815] refill_obj_stock (mm/memcontrol.c:3339 (discriminator 2))
<4>[ 88.197367] obj_cgroup_uncharge (mm/memcontrol.c:3406)
<4>[ 88.197835] kmem_cache_free (include/linux/mm.h:1630
include/linux/mm.h:1849 include/linux/mm.h:1859 mm/slab.h:208
mm/slab.h:572 mm/slub.c:3804 mm/slub.c:3831)
<4>[ 88.198407] put_pid.part.0 (kernel/pid.c:118)
<4>[ 88.198870] delayed_put_pid (kernel/pid.c:127)
<4>[ 88.200527] rcu_core (arch/arm64/include/asm/preempt.h:13
(discriminator 1) kernel/rcu/tree.c:2146 (discriminator 1)
kernel/rcu/tree.c:2403 (discriminator 1))
<4>[ 88.200978] rcu_core_si (kernel/rcu/tree.c:2421)
<4>[ 88.201972] __do_softirq (arch/arm64/include/asm/jump_label.h:21
include/linux/jump_label.h:207 include/trace/events/irq.h:142
kernel/softirq.c:554)
<4>[ 88.202587] ____do_softirq (arch/arm64/kernel/irq.c:81)
<4>[ 88.203049] call_on_irq_stack (arch/arm64/kernel/entry.S:892)
<4>[ 88.203544] do_softirq_own_stack (arch/arm64/kernel/irq.c:86)
<4>[ 88.204008] irq_exit_rcu (arch/arm64/include/asm/percpu.h:44
kernel/softirq.c:612 kernel/softirq.c:634 kernel/softirq.c:644)
<4>[ 88.204401] el1_interrupt (arch/arm64/include/asm/current.h:19
arch/arm64/kernel/entry-common.c:246
arch/arm64/kernel/entry-common.c:505
arch/arm64/kernel/entry-common.c:517)
<4>[ 88.205751] el1h_64_irq_handler (arch/arm64/kernel/entry-common.c:523)
<4>[ 88.206672] el1h_64_irq (arch/arm64/kernel/entry.S:591)
<4>[ 88.207329] map_id_range_down (kernel/user_namespace.c:299
kernel/user_namespace.c:319)
<4>[ 88.208250] make_kuid (kernel/user_namespace.c:412)
<4>[ 88.208826] inode_init_always (include/linux/fs.h:1343
(discriminator 1) fs/inode.c:174 (discriminator 1))
<4>[ 88.209678] alloc_inode (fs/inode.c:266 (discriminator 2))
<4>[ 88.210105] new_inode (fs/inode.c:1004 fs/inode.c:1030)
<4>[ 88.210542] proc_pid_make_inode (fs/proc/base.c:1898)
<4>[ 88.210963] proc_pid_instantiate (fs/proc/base.c:1949 fs/proc/base.c:3420)
<4>[ 88.211361] proc_pid_lookup (fs/proc/base.c:3464)
<4>[ 88.211762] proc_root_lookup (fs/proc/root.c:325 (discriminator 1))
<4>[ 88.212299] __lookup_slow (fs/namei.c:1694)
<4>[ 88.212739] walk_component (fs/namei.c:1711 fs/namei.c:2002)
<4>[ 88.213244] link_path_walk.part.0.constprop.0 (fs/namei.c:2331
(discriminator 1))
<4>[ 88.213803] path_openat (fs/namei.c:2254 (discriminator 1)
fs/namei.c:3793 (discriminator 1))
<4>[ 88.214264] do_filp_open (fs/namei.c:3824)
<4>[ 88.214550] do_sys_openat2 (fs/open.c:1422)
<4>[ 88.215080] __arm64_sys_openat (fs/open.c:1448)
<4>[ 88.215495] invoke_syscall (arch/arm64/include/asm/current.h:19
arch/arm64/kernel/syscall.c:56)
<4>[ 88.215986] el0_svc_common.constprop.0
(include/linux/thread_info.h:127 (discriminator 2)
arch/arm64/kernel/syscall.c:144 (discriminator 2))
<4>[ 88.216476] do_el0_svc (arch/arm64/kernel/syscall.c:156)
<4>[ 88.216910] el0_svc (arch/arm64/include/asm/daifflags.h:28
arch/arm64/kernel/entry-common.c:133
arch/arm64/kernel/entry-common.c:144
arch/arm64/kernel/entry-common.c:679)
<4>[ 88.217246] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:697)
<4>[ 88.217766] el0t_64_sync (arch/arm64/kernel/entry.S:595)
<0>[ 88.218477] Code: a90153f3 aa0003f4 aa0103f3 97f6f396 (f9400280)
All code
========
   0: a90153f3 stp x19, x20, [sp, #16]
   4: aa0003f4 mov x20, x0
   8: aa0103f3 mov x19, x1
   c: 97f6f396 bl 0xffffffffffdbce64
  10:* f9400280 ldr x0, [x20] <-- trapping instruction

Code starting with the faulting instruction
===========================================
   0: f9400280 ldr x0, [x20]
<4>[   88.219947] ---[ end trace 0000000000000000 ]---
<0>[   88.220779] Kernel panic - not syncing: Oops: Fatal exception in interrupt
<2>[   88.221715] SMP: stopping secondary CPUs
<0>[   88.226328] Kernel Offset: 0x3c9385a00000 from 0xffff800080000000
<0>[   88.226953] PHYS_OFFSET: 0x40000000
<0>[   88.227382] CPU features: 0x0,00000000,d1e2cf43,99e6773f
<0>[   88.228141] Memory Limit: none
<0>[   88.228905] ---[ end Kernel panic - not syncing: Oops: Fatal
exception in interrupt ]---

Links:
- https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-6.6.y/build/v6.6-31-gac6cb619d608/testrun/20963487/suite/log-parser-test/tests/
- https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-6.6.y/build/v6.6-31-gac6cb619d608/testrun/20963487/suite/log-parser-test/test/check-kernel-oops/log
- https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/2XntnCQFUyH9ZTp4CynoCSijCrR

--
Linaro LKFT
https://lkft.linaro.org

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