Re: BUG: soft lockup in smp_call_function

From: Zhang, Qiang
Date: Wed Sep 15 2021 - 01:12:40 EST

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In reply to: Hao Sun: "BUG: soft lockup in smp_call_function"
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Hi Sun

It's like csd_lock cannot be acquired, causing the problem
Enable CONFIG_CSD_LOCK_WAIT_DEBUG for more information.

Thanks
Qiang

________________________________________
From: Hao Sun <sunhao.th@xxxxxxxxx>
Sent: Wednesday, 15 September 2021 09:59
To: linux-kernel@xxxxxxxxxxxxxxx
Cc: mingo@xxxxxxxxxx
Subject: BUG: soft lockup in smp_call_function

[Please note: This e-mail is from an EXTERNAL e-mail address]

Hello,

When using Healer to fuzz the latest Linux kernel, the following two
similar crashes was triggered.

HEAD commit: 6880fa6c5660 Linux 5.15-rc1
git tree: upstream
console output:
https://drive.google.com/file/d/1W2g_mj5JPDXI5U7HibVepNdxMdChKS0_/view?usp=sharing
kernel config: https://drive.google.com/file/d/1rUzyMbe5vcs6khA3tL9EHTLJvsUdWcgB/view?usp=sharing
similar report: INFO: rcu detected stall in smp_call_function

Sorry, I don't have a reproducer for this crash, hope the symbolized
report can help.
If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@xxxxxxxxx>

watchdog: BUG: soft lockup - CPU#1 stuck for 157s! [kworker/1:8:14241]
Modules linked in:
irq event stamp: 371624
hardirqs last enabled at (371623): [<ffffffff84400c02>]
asm_sysvec_apic_timer_interrupt+0x12/0x20
arch/x86/include/asm/idtentry.h:638
hardirqs last disabled at (371624): [<ffffffff8424818a>]
sysvec_apic_timer_interrupt+0xa/0xc0 arch/x86/kernel/apic/apic.c:1097
softirqs last enabled at (337636): [<ffffffff84600398>]
softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last enabled at (337636): [<ffffffff84600398>]
__do_softirq+0x398/0x561 kernel/softirq.c:587
softirqs last disabled at (337625): [<ffffffff81235b42>]
invoke_softirq kernel/softirq.c:432 [inline]
softirqs last disabled at (337625): [<ffffffff81235b42>]
__irq_exit_rcu kernel/softirq.c:636 [inline]
softirqs last disabled at (337625): [<ffffffff81235b42>]
irq_exit_rcu+0xe2/0x100 kernel/softirq.c:648
CPU: 1 PID: 14241 Comm: kworker/1:8 Not tainted 5.15.0-rc1 #16
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: rcu_gp wait_rcu_exp_gp
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:csd_lock kernel/smp.c:446 [inline]
RIP: 0010:smp_call_function_single+0x1a3/0x220 kernel/smp.c:745
Code: 48 c7 c3 80 a8 02 00 e8 cb b1 f1 02 89 c0 48 83 f8 07 77 6c 48
03 1c c5 80 98 62 85 8b 43 08 a8 01 74 0e e8 3f 9d 04 00 f3 90 <8b> 43
08 a8 01 75 f2 e8 31 9d 04 00 83 4b 08 01 48 89 de 44 89 e7
RSP: 0018:ffffc90001d4fd00 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff88813dc2a880 RCX: 0000000000000000
RDX: ffff888112ac8000 RSI: ffffffff8132f4c1 RDI: ffffffff852d80e6
RBP: ffffc90001d4fd90 R08: 0000000000000001 R09: 0000000000000001
R10: ffffc90001d4fda8 R11: 0000000000000002 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff812ef7c0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88813dc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a15807ccf0 CR3: 0000000025f6b000 CR4: 0000000000750ee0
PKRU: 55555554
Call Trace:
sync_rcu_exp_select_node_cpus+0x27b/0x440 kernel/rcu/tree_exp.h:393
sync_rcu_exp_select_cpus+0x238/0x5d0 kernel/rcu/tree_exp.h:441
rcu_exp_sel_wait_wake kernel/rcu/tree_exp.h:615 [inline]
wait_rcu_exp_gp+0xa/0x20 kernel/rcu/tree_exp.h:629
process_one_work+0x359/0x850 kernel/workqueue.c:2297
worker_thread+0x41/0x4d0 kernel/workqueue.c:2444
kthread+0x178/0x1b0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0,2-3:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.15.0-rc1 #16
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
RIP: 0010:__lock_acquire+0x14f/0x1d60 kernel/locking/lockdep.c:4955
Code: 00 48 89 43 08 48 8b 04 24 48 89 43 18 41 8b b5 dc 09 00 00 65
8b 05 08 ed d5 7e 85 c0 0f 95 c2 31 c0 85 f6 44 89 fe 0f 95 c0 <83> e1
03 c1 e6 07 8d 14 50 0f b6 43 21 83 e2 03 c1 e2 05 83 e0 1f
RSP: 0018:ffffc90000003c40 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffffffff858b2d70 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88813dd1a3d8
RBP: 0000000000000057 R08: 0000000000000001 R09: 0000000000000001
R10: ffff88813dd1a3d8 R11: 0000000000000003 R12: 0000000000000001
R13: ffffffff858b2300 R14: ffffffff858b2cf8 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a1580bf6d7 CR3: 0000000025f6b000 CR4: 0000000000750ef0
PKRU: 55555554
Call Trace:
<IRQ>
lock_acquire+0x1f9/0x340 kernel/locking/lockdep.c:5625
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x38/0x50 kernel/locking/spinlock.c:162
lock_hrtimer_base+0x2f/0x70 kernel/time/hrtimer.c:173
hrtimer_try_to_cancel+0x6d/0x270 kernel/time/hrtimer.c:1331
hrtimer_cancel+0x12/0x30 kernel/time/hrtimer.c:1443
__disable_vblank drivers/gpu/drm/drm_vblank.c:434 [inline]
drm_vblank_disable_and_save+0xca/0x130 drivers/gpu/drm/drm_vblank.c:478
vblank_disable_fn+0x83/0xa0 drivers/gpu/drm/drm_vblank.c:495
call_timer_fn+0xcb/0x3f0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers kernel/time/timer.c:1734 [inline]
run_timer_softirq+0x6bd/0x820 kernel/time/timer.c:1747
__do_softirq+0xe9/0x561 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu kernel/softirq.c:636 [inline]
irq_exit_rcu+0xe2/0x100 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1097
</IRQ>
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:717
Code: 60 ce 25 84 75 09 48 83 c4 18 5b 5d 41 5c c3 e8 ab c4 fe ff cc
cc cc cc cc cc cc cc cc cc cc eb 07 0f 00 2d ff 00 5c 00 fb f4 <c3> 0f
1f 40 00 65 48 8b 04 25 40 70 01 00 f0 80 48 02 20 48 8b 10
RSP: 0018:ffffffff85803e90 EFLAGS: 00000202
RAX: 00000000010c94ab RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff85524f3d RDI: ffffffff853cbec6
RBP: ffffffff860d9290 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff85803be8 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff858b2300
default_idle_call+0x6a/0x260 kernel/sched/idle.c:112
cpuidle_idle_call kernel/sched/idle.c:194 [inline]
do_idle+0x1e9/0x2b0 kernel/sched/idle.c:306
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403
start_kernel+0x839/0x860 init/main.c:1141
secondary_startup_64_no_verify+0xb0/0xbb
NMI backtrace for cpu 2
CPU: 2 PID: 9794 Comm: sshd Not tainted 5.15.0-rc1 #16
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:197
Code: 65 48 8b 14 25 40 70 01 00 81 e1 00 01 00 00 a9 00 01 ff 00 74
0e 85 c9 74 35 8b 82 34 15 00 00 85 c0 74 2b 8b 82 10 15 00 00 <83> f8
02 75 20 48 8b 8a 18 15 00 00 8b 92 14 15 00 00 48 8b 01 48
RSP: 0018:ffffc900008cfa80 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88807dc318e0 RCX: 0000000000000000
RDX: ffff88800e9c4480 RSI: ffffffff8132ebc0 RDI: 00000000ffffffff
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffc900008cfa30 R11: 0000000000000000 R12: ffff88807dd2a900
R13: ffff88807dd2a908 R14: ffffffff85a27620 R15: 0000000000000000
FS: 00007f831f8568c0(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd76d1df1f CR3: 000000000fe3c000 CR4: 0000000000750ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline]
cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
csd_lock_wait kernel/smp.c:440 [inline]
smp_call_function_many_cond+0x1d0/0x550 kernel/smp.c:969
on_each_cpu_cond_mask+0x48/0x90 kernel/smp.c:1135
__purge_vmap_area_lazy+0xd7/0xa40 mm/vmalloc.c:1683
_vm_unmap_aliases+0x233/0x280 mm/vmalloc.c:2107
change_page_attr_set_clr+0xb3/0x340 arch/x86/mm/pat/set_memory.c:1740
change_page_attr_clear arch/x86/mm/pat/set_memory.c:1797 [inline]
set_memory_ro+0x2b/0x40 arch/x86/mm/pat/set_memory.c:1943
bpf_jit_binary_lock_ro include/linux/filter.h:890 [inline]
bpf_int_jit_compile+0x65d/0x6b0 arch/x86/net/bpf_jit_comp.c:2338
bpf_prog_select_runtime+0x173/0x1e0 kernel/bpf/core.c:1914
bpf_migrate_filter net/core/filter.c:1295 [inline]
bpf_prepare_filter+0x40d/0x5d0 net/core/filter.c:1343
bpf_prog_create_from_user+0xcf/0x150 net/core/filter.c:1437
seccomp_prepare_filter kernel/seccomp.c:666 [inline]
seccomp_prepare_user_filter kernel/seccomp.c:703 [inline]
seccomp_set_mode_filter kernel/seccomp.c:1824 [inline]
do_seccomp+0x2ca/0xdb0 kernel/seccomp.c:1944
prctl_set_seccomp+0x2f/0x60 kernel/seccomp.c:1997
__do_sys_prctl kernel/sys.c:2346 [inline]
__se_sys_prctl kernel/sys.c:2264 [inline]
__x64_sys_prctl+0xd4/0x770 kernel/sys.c:2264
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f831d9cd54a
Code: 48 8b 0d 51 f9 2a 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 9d 00 00 00 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 8b 0d 1e f9 2a 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd76d1c428 EFLAGS: 00000246 ORIG_RAX: 000000000000009d
RAX: ffffffffffffffda RBX: 00005597d3a36f20 RCX: 00007f831d9cd54a
RDX: 00005597d32bdf50 RSI: 0000000000000002 RDI: 0000000000000016
RBP: 00005597d3a35d40 R08: 0000000000000000 R09: 0000000000000005
R10: 00007f831d9cd54a R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000028 R14: 0000000000000000 R15: 00007ffd76d1c870
NMI backtrace for cpu 3
CPU: 3 PID: 9782 Comm: syz-executor Not tainted 5.15.0-rc1 #16
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
RIP: 0010:kvm_wait+0x4a/0x70 arch/x86/kernel/kvm.c:893
Code: 5d c3 89 f3 48 89 fd 9c 58 fa f6 c4 02 75 30 0f b6 45 00 38 c3
74 16 e8 94 82 25 00 fb 5b 5d c3 eb 07 0f 00 2d 95 c1 6d 03 f4 <5b> 5d
c3 e8 7e 82 25 00 eb 07 0f 00 2d 83 c1 6d 03 fb f4 eb c0 e8
RSP: 0000:ffffc90000768e00 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff888100998338 RCX: 0000000000000008
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff888100998338
RBP: ffff88813dd2a600 R08: 0000000000000000 R09: 0000000000000001
R10: ffffc90000768d20 R11: 0000000000000002 R12: 0000000000000001
R13: 0000000000000100 R14: 0000000000000000 R15: 0000000000100000
FS: 00007f849523b700(0000) GS:ffff88813dd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020400010 CR3: 0000000025f6b000 CR4: 0000000000750ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
<IRQ>
pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
__pv_queued_spin_lock_slowpath+0x262/0x330 kernel/locking/qspinlock.c:508
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
do_raw_spin_lock+0xb6/0xc0 kernel/locking/spinlock_debug.c:115
spin_lock include/linux/spinlock.h:363 [inline]
drm_handle_vblank+0x86/0x530 drivers/gpu/drm/drm_vblank.c:1951
vkms_vblank_simulate+0x5a/0x190 drivers/gpu/drm/vkms/vkms_crtc.c:29
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0xb8/0x610 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0xfe/0x280 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x9c/0x2c0 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x99/0xc0 arch/x86/kernel/apic/apic.c:1097
</IRQ>
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 0f 1f 44 00 00 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 be ce
05 fd 48 89 df e8 f6 06 06 fd e8 e1 19 14 fd fb bf 01 00 00 00 <e8> 76
9c 01 fd 65 8b 05 df 93 db 7b 85 c0 74 02 5b c3 e8 9b 4c da
RSP: 0000:ffffc90001503e18 EFLAGS: 00000202
RAX: 00000000000b619e RBX: ffff88813dd18240 RCX: 0000000000000100
RDX: 0000000000000000 RSI: ffffffff85524f3d RDI: 0000000000000001
RBP: ffffc90001503e50 R08: 0000000000000001 R09: 0000000000000001
R10: ffffc90001503e28 R11: 0000000000000001 R12: ffff88810d86c9c0
R13: ffffc90001503e50 R14: ffffffff839a5e10 R15: ffffffff860d9290
expire_timers kernel/time/timer.c:1465 [inline]
__run_timers kernel/time/timer.c:1734 [inline]
run_timer_softirq+0x6ae/0x820 kernel/time/timer.c:1747
__do_softirq+0xe9/0x561 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu kernel/softirq.c:636 [inline]
irq_exit_rcu+0xe2/0x100 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0033:0x418dcf
Code: 1f 84 00 00 00 00 00 0f 1f 40 00 64 8b 04 25 08 03 00 00 41 89
c3 41 83 cb 02 41 39 c3 74 17 f0 64 44 0f b1 1c 25 08 03 00 00 <75> e7
41 83 e3 bb 41 83 fb 0a 74 01 c3 48 83 ec 08 64 48 c7 04 25
RSP: 002b:00007f849523a9b8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000003 R15: 00000000204413a0
----------------
Code disassembly (best guess):
0: 48 c7 c3 80 a8 02 00 mov $0x2a880,%rbx
7: e8 cb b1 f1 02 callq 0x2f1b1d7
c: 89 c0 mov %eax,%eax
e: 48 83 f8 07 cmp $0x7,%rax
12: 77 6c ja 0x80
14: 48 03 1c c5 80 98 62 add -0x7a9d6780(,%rax,8),%rbx
1b: 85
1c: 8b 43 08 mov 0x8(%rbx),%eax
1f: a8 01 test $0x1,%al
21: 74 0e je 0x31
23: e8 3f 9d 04 00 callq 0x49d67
28: f3 90 pause
* 2a: 8b 43 08 mov 0x8(%rbx),%eax <-- trapping instruction
2d: a8 01 test $0x1,%al
2f: 75 f2 jne 0x23
31: e8 31 9d 04 00 callq 0x49d67
36: 83 4b 08 01 orl $0x1,0x8(%rbx)
3a: 48 89 de mov %rbx,%rsi
3d: 44 89 e7 mov %r12d,%edi

===== INFO: rcu detected stall in smp_call_function

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (3203 ticks this GP) idle=417/1/0x4000000000000000
softirq=25875/25875 fqs=485
(t=10500 jiffies g=37621 q=38)
rcu: rcu_preempt kthread starved for 486 jiffies! g37621 f0x0
RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=3
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now
expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:13832 pid: 16
ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4940 [inline]
__schedule+0x323/0xae0 kernel/sched/core.c:6287
schedule+0x36/0xe0 kernel/sched/core.c:6366
schedule_timeout+0x2cb/0x430 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x2f7/0x3e0 kernel/rcu/tree.c:1957
rcu_gp_kthread+0xd0/0x160 kernel/rcu/tree.c:2130
kthread+0x178/0x1b0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 3:
NMI backtrace for cpu 3
CPU: 3 PID: 14220 Comm: kworker/3:10 Not tainted 5.15.0-rc1 #16
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: rcu_gp wait_rcu_exp_gp
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:csd_lock kernel/smp.c:446 [inline]
RIP: 0010:smp_call_function_single+0x1a6/0x220 kernel/smp.c:745
Code: 80 a8 02 00 e8 cb b1 f1 02 89 c0 48 83 f8 07 77 6c 48 03 1c c5
80 98 62 85 8b 43 08 a8 01 74 0e e8 3f 9d 04 00 f3 90 8b 43 08 <a8> 01
75 f2 e8 31 9d 04 00 83 4b 08 01 48 89 de 44 89 e7 4c 89 73
RSP: 0018:ffffc90005793d00 EFLAGS: 00000293
RAX: 0000000000000001 RBX: ffff88813dd2a880 RCX: 0000000000000000
RDX: ffff888103ddc480 RSI: ffffffff8132f4c1 RDI: ffffffff852d80e6
RBP: ffffc90005793d90 R08: 0000000000000001 R09: 0000000000000001
R10: ffffc90005793da8 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff812ef7c0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88813dd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b72e9c2cd8 CR3: 000000000dedc000 CR4: 0000000000750ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
sync_rcu_exp_select_node_cpus+0x27b/0x440 kernel/rcu/tree_exp.h:393
sync_rcu_exp_select_cpus+0x238/0x5d0 kernel/rcu/tree_exp.h:441
rcu_exp_sel_wait_wake kernel/rcu/tree_exp.h:615 [inline]
wait_rcu_exp_gp+0xa/0x20 kernel/rcu/tree_exp.h:629
process_one_work+0x359/0x850 kernel/workqueue.c:2297
worker_thread+0x41/0x4d0 kernel/workqueue.c:2444
kthread+0x178/0x1b0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
NMI backtrace for cpu 0
CPU: 0 PID: 9 Comm: kworker/u9:0 Not tainted 5.15.0-rc1 #16
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: events_unbound toggle_allocation_gate
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106
nmi_cpu_backtrace+0x1e9/0x210 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x120/0x180 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x125/0x17b kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3880 [inline]
rcu_sched_clock_irq+0xc20/0x1360 kernel/rcu/tree.c:2599
update_process_times+0xac/0x100 kernel/time/timer.c:1785
tick_sched_handle.isra.20+0x27/0x70 kernel/time/tick-sched.c:226
tick_sched_timer+0x8a/0xb0 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x23e/0x610 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0xfe/0x280 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x9c/0x2c0 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x99/0xc0 arch/x86/kernel/apic/apic.c:1097
</IRQ>
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0x1d2/0x550 kernel/smp.c:969
Code: a6 04 00 4c 63 fd 49 8b 1c 24 49 83 ff 07 0f 87 31 03 00 00 4a
03 1c fd 80 98 62 85 8b 43 08 a8 01 74 0e e8 40 a6 04 00 f3 90 <8b> 43
08 a8 01 75 f2 e8 32 a6 04 00 eb ad 48 83 c4 40 5b 5d 41 5c
RSP: 0018:ffffc9000067bc80 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff88807dd2f9c0 RCX: 0000000000000000
RDX: ffff88800985c480 RSI: ffffffff8132ebc0 RDI: 0000000000000001
RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000001
R10: ffffc9000067bc28 R11: 0000000000000000 R12: ffff88807dc2a900
R13: ffff88807dc2a908 R14: ffffffff85a27620 R15: 0000000000000002
on_each_cpu_cond_mask+0x48/0x90 kernel/smp.c:1135
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:929 [inline]
text_poke_bp_batch+0xb6/0x2c0 arch/x86/kernel/alternative.c:1114
text_poke_flush arch/x86/kernel/alternative.c:1268 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1275
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
jump_label_update+0xbc/0x190 kernel/jump_label.c:830
static_key_enable_cpuslocked+0x77/0xb0 kernel/jump_label.c:177
static_key_enable+0x16/0x20 kernel/jump_label.c:190
toggle_allocation_gate+0x71/0x240 mm/kfence/core.c:626
process_one_work+0x359/0x850 kernel/workqueue.c:2297
worker_thread+0x41/0x4d0 kernel/workqueue.c:2444
kthread+0x178/0x1b0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 2:
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 02 00 add (%rax),%al
2: e8 cb b1 f1 02 callq 0x2f1b1d2
7: 89 c0 mov %eax,%eax
9: 48 83 f8 07 cmp $0x7,%rax
d: 77 6c ja 0x7b
f: 48 03 1c c5 80 98 62 add -0x7a9d6780(,%rax,8),%rbx
16: 85
17: 8b 43 08 mov 0x8(%rbx),%eax
1a: a8 01 test $0x1,%al
1c: 74 0e je 0x2c
1e: e8 3f 9d 04 00 callq 0x49d62
23: f3 90 pause
25: 8b 43 08 mov 0x8(%rbx),%eax
* 28: a8 01 test $0x1,%al <-- trapping instruction
2a: 75 f2 jne 0x1e
2c: e8 31 9d 04 00 callq 0x49d62
31: 83 4b 08 01 orl $0x1,0x8(%rbx)
35: 48 89 de mov %rbx,%rsi
38: 44 89 e7 mov %r12d,%edi
3b: 4c rex.WR
3c: 89 .byte 0x89
3d: 73 .byte 0x73

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