[Kernel Bug] INFO: rcu detected stall in count_memcg_event_mm
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Longxing Li
Jun 9, 2026, 7:58:11 AM (yesterday) Jun 9
to syzk...@googlegroups.com, han...@cmpxchg.org, mho...@kernel.org, roman.g...@linux.dev, shakee...@linux.dev, muchu...@linux.dev, cgr...@vger.kernel.org, linu...@kvack.org, linux-...@vger.kernel.org
Dear Linux kernel developers and maintainers,
We would like to report a new kernel bug found by our tool. INFO: rcu
detected stall in count_memcg_event_mm. Details are as follows.
Kernel commit: v5.15.189
Kernel config: see attachment
report: see attachment
Syz repro: see attachment
We are currently analyzing the root cause. We will provide further
updates in this thread as soon as we have more information.
Best regards,
Longxing Li
==================================================================
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-0): P12059/1:b..l
(detected by 0, t=10502 jiffies, g=18873, q=1488)
task:systemd-sysctl state:R running task stack:28320 pid:12059
ppid: 10470 flags:0x00000200
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0xd98/0x5b40 kernel/sched/core.c:6376
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6780
irqentry_exit+0x31/0x80 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:task_css include/linux/cgroup.h:496 [inline]
RIP: 0010:mem_cgroup_from_task+0x9/0x140 mm/memcontrol.c:935
Code: 0f fa ff 31 c0 5b 5d c3 b8 f4 ff ff ff eb f6 e8 3d b4 fa ff eb
be 66 66 2e 0f 1f 84 00 00 00 00 00 48 85 ff 0f 84 0f 01 00 00 <48> b8
00 00 00 00 00 fc ff df 55 53 48 89 fb 48 8d bf 60 13 00 00
RSP: 0000:ffffc9000dbafe58 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81ae3af8
RDX: ffff8880209d24c0 RSI: ffffffff81ae393d RDI: ffff8880209d24c0
RBP: ffff8880209d24c0 R08: 0000000000000000 R09: ffffffff93062a27
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000014
R13: ffffc9000dbaff58 R14: ffff8880209d24c0 R15: 0000000000000010
count_memcg_event_mm.part.0+0xa5/0x340 include/linux/memcontrol.h:1079
count_memcg_event_mm include/linux/memcontrol.h:609 [inline]
handle_mm_fault+0xcf/0x770 mm/memory.c:4863
do_user_addr_fault+0x4a5/0x1150 arch/x86/mm/fault.c:1357
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x58/0xd0 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f7a1e783970
RSP: 002b:00007ffeabd9ad48 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007f7a1e464608 RCX: fffffffffffffeb8
RDX: 00007f7a1e4661a4 RSI: 00007f7a1e45c8f6 RDI: 00007f7a1e45c827
RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000002b0 R11: 0000000000000246 R12: 00007ffeabd9ae88
R13: 0000000000000001 R14: 00007f7a1e464610 R15: 0000000000000000
</TASK>
rcu: rcu_preempt kthread starved for 10466 jiffies! g18873 f0x0
RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:28656 pid: 15
ppid: 2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0xd98/0x5b40 kernel/sched/core.c:6376
schedule+0x115/0x250 kernel/sched/core.c:6459
schedule_timeout+0x153/0x2a0 kernel/time/timer.c:1914
rcu_gp_fqs_loop+0x1c0/0x980 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x1e6/0x330 kernel/rcu/tree.c:2145
kthread+0x3d0/0x4c0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 12075 Comm: syz-executor.6 Not tainted 5.15.189 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xfc/0x174 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x22/0x16f lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x23e/0x290 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
rcu_check_gp_kthread_starvation.cold+0x1ca/0x1cc kernel/rcu/tree_stall.h:487
print_other_cpu_stall kernel/rcu/tree_stall.h:592 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:745 [inline]
rcu_pending kernel/rcu/tree.c:3936 [inline]
rcu_sched_clock_irq+0x21a2/0x2610 kernel/rcu/tree.c:2619
update_process_times+0x1c5/0x280 kernel/time/timer.c:1818
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:254
tick_sched_timer+0xe9/0x110 kernel/time/tick-sched.c:1473
__run_hrtimer kernel/time/hrtimer.c:1690 [inline]
__hrtimer_run_queues+0x64c/0xc00 kernel/time/hrtimer.c:1754
hrtimer_interrupt+0x317/0x7e0 kernel/time/hrtimer.c:1816
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x146/0x430 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:unwind_next_frame+0xd03/0x1d20 arch/x86/kernel/unwind_orc.c:545
Code: 20 84 c0 4c 8b 44 24 28 48 8b 4c 24 30 0f 84 56 07 00 00 48 b8
00 00 00 00 00 fc ff df 48 8b 54 24 08 48 c1 ea 03 80 3c 02 00 <0f> 85
16 0a 00 00 48 8b 14 24 4d 89 4e 38 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90000007568 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 1ffff92000000eb5 RCX: ffffffff8e89bb65
RDX: 1ffff92000000ecf RSI: ffffc9000dccf678 RDI: ffffc9000dccf678
RBP: 0000000000000001 R08: ffffffff8e89bb60 R09: ffffc9000dccf680
R10: fffff52000000ed3 R11: 000000000008e07d R12: ffffc90000007688
R13: ffffc90000007675 R14: ffffc90000007640 R15: ffffffff8e89bb64
arch_stack_walk+0x87/0xe0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x92/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x2a/0x50 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc+0x7f/0xa0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:604 [inline]
dst_cow_metrics_generic+0x48/0x1e0 net/core/dst.c:202
dst_metrics_write_ptr include/net/dst.h:118 [inline]
dst_metric_set include/net/dst.h:179 [inline]
icmp6_dst_alloc+0x4ee/0x670 net/ipv6/route.c:3281
ndisc_send_skb+0x10b4/0x1570 net/ipv6/ndisc.c:493
ndisc_send_rs+0x12f/0x690 net/ipv6/ndisc.c:707
addrconf_rs_timer+0x413/0x810 net/ipv6/addrconf.c:3957
call_timer_fn+0x1a5/0x580 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x75d/0xb20 kernel/time/timer.c:1767
run_timer_softirq+0x54/0xd0 kernel/time/timer.c:1780
handle_softirqs+0x21a/0x950 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0xed/0x190 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1108
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1170 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0x21/0x150 kernel/rcu/tree.c:1162
Code: 00 48 8b 14 24 eb c8 66 90 65 8b 15 39 81 9e 7e 81 e2 00 00 f0
00 b8 01 00 00 00 75 0a 8b 15 f2 2b a2 0c 85 d2 75 01 c3 55 53 <65> ff
05 18 81 9e 7e e8 f3 fc 53 08 48 c7 c3 40 b5 03 00 83 f8 07
RSP: 0018:ffffc9000dccf660 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff88801cdf0000 RCX: 0000000000000001
RDX: 0000000000000001 RSI: ffffffff8a640000 RDI: ffffffff8bc7b8c0
RBP: ffff88806b299000 R08: 0000000000000000 R09: ffffffff93062a27
R10: fffffbfff260c544 R11: 1ffff11003dd908a R12: 0000000000000cc0
R13: 0000000000000001 R14: ffffffff81d2f5eb R15: 0000000000000000
rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
rcu_read_lock_held+0x1f/0x40 kernel/rcu/update.c:309
task_css.constprop.0+0xc9/0x130 include/linux/cgroup.h:496
mem_cgroup_from_task mm/memcontrol.c:935 [inline]
get_obj_cgroup_from_current+0x120/0x510 mm/memcontrol.c:2926
memcg_slab_pre_alloc_hook mm/slab.h:283 [inline]
slab_pre_alloc_hook mm/slab.h:497 [inline]
slab_alloc_node mm/slub.c:3134 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x76/0x2f0 mm/slub.c:3233
__d_alloc+0x2b/0x8e0 fs/dcache.c:1749
d_alloc+0x4a/0x220 fs/dcache.c:1828
d_alloc_parallel+0xdd/0x1c70 fs/dcache.c:2582
lookup_open.isra.0+0xb06/0x1660 fs/namei.c:3387
open_last_lookups fs/namei.c:3532 [inline]
path_openat+0xad1/0x2c00 fs/namei.c:3739
do_filp_open+0x1d4/0x430 fs/namei.c:3769
do_sys_openat2+0x185/0x4f0 fs/open.c:1253
do_sys_open fs/open.c:1269 [inline]
__do_sys_openat fs/open.c:1285 [inline]
__se_sys_openat fs/open.c:1280 [inline]
__x64_sys_openat+0x171/0x210 fs/open.c:1280
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x46a4e4
Code: 24 20 eb 8f 66 90 44 89 54 24 0c e8 06 d9 02 00 44 8b 54 24 0c
44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d
00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 48 d9 02 00 8b 44
RSP: 002b:00007f2a6d102f60 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000046a4e4
RDX: 0000000000000002 RSI: 00007f2a6d102ff0 RDI: 00000000ffffff9c
RBP: 00007f2a6d102ff0 R08: 0000000000000000 R09: 00007f2a6d102e70
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
R13: 00000000004e9478 R14: 00007f2a6d1035f4 R15: 00000000ffffffff
</TASK>
https://drive.google.com/file/d/13nr1pPRHCrZqYxz08ngNiCvmcRe-d_oK/view?usp=drive_link
https://drive.google.com/file/d/1RHa5bKm8YN-h9wRh_dJH0q1ZBF5mzYOh/view?usp=drive_link
https://drive.google.com/file/d/15HyqruIzxnkYVh4FXjmU-yY_zTB8kwPI/view?usp=drive_link
We would like to report a new kernel bug found by our tool. INFO: rcu
detected stall in count_memcg_event_mm. Details are as follows.
Kernel commit: v5.15.189
Kernel config: see attachment
report: see attachment
Syz repro: see attachment
We are currently analyzing the root cause. We will provide further
updates in this thread as soon as we have more information.
Best regards,
Longxing Li
==================================================================
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-0): P12059/1:b..l
(detected by 0, t=10502 jiffies, g=18873, q=1488)
task:systemd-sysctl state:R running task stack:28320 pid:12059
ppid: 10470 flags:0x00000200
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0xd98/0x5b40 kernel/sched/core.c:6376
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6780
irqentry_exit+0x31/0x80 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:task_css include/linux/cgroup.h:496 [inline]
RIP: 0010:mem_cgroup_from_task+0x9/0x140 mm/memcontrol.c:935
Code: 0f fa ff 31 c0 5b 5d c3 b8 f4 ff ff ff eb f6 e8 3d b4 fa ff eb
be 66 66 2e 0f 1f 84 00 00 00 00 00 48 85 ff 0f 84 0f 01 00 00 <48> b8
00 00 00 00 00 fc ff df 55 53 48 89 fb 48 8d bf 60 13 00 00
RSP: 0000:ffffc9000dbafe58 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81ae3af8
RDX: ffff8880209d24c0 RSI: ffffffff81ae393d RDI: ffff8880209d24c0
RBP: ffff8880209d24c0 R08: 0000000000000000 R09: ffffffff93062a27
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000014
R13: ffffc9000dbaff58 R14: ffff8880209d24c0 R15: 0000000000000010
count_memcg_event_mm.part.0+0xa5/0x340 include/linux/memcontrol.h:1079
count_memcg_event_mm include/linux/memcontrol.h:609 [inline]
handle_mm_fault+0xcf/0x770 mm/memory.c:4863
do_user_addr_fault+0x4a5/0x1150 arch/x86/mm/fault.c:1357
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x58/0xd0 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f7a1e783970
RSP: 002b:00007ffeabd9ad48 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007f7a1e464608 RCX: fffffffffffffeb8
RDX: 00007f7a1e4661a4 RSI: 00007f7a1e45c8f6 RDI: 00007f7a1e45c827
RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000002b0 R11: 0000000000000246 R12: 00007ffeabd9ae88
R13: 0000000000000001 R14: 00007f7a1e464610 R15: 0000000000000000
</TASK>
rcu: rcu_preempt kthread starved for 10466 jiffies! g18873 f0x0
RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:28656 pid: 15
ppid: 2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0xd98/0x5b40 kernel/sched/core.c:6376
schedule+0x115/0x250 kernel/sched/core.c:6459
schedule_timeout+0x153/0x2a0 kernel/time/timer.c:1914
rcu_gp_fqs_loop+0x1c0/0x980 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x1e6/0x330 kernel/rcu/tree.c:2145
kthread+0x3d0/0x4c0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 12075 Comm: syz-executor.6 Not tainted 5.15.189 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xfc/0x174 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x22/0x16f lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x23e/0x290 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
rcu_check_gp_kthread_starvation.cold+0x1ca/0x1cc kernel/rcu/tree_stall.h:487
print_other_cpu_stall kernel/rcu/tree_stall.h:592 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:745 [inline]
rcu_pending kernel/rcu/tree.c:3936 [inline]
rcu_sched_clock_irq+0x21a2/0x2610 kernel/rcu/tree.c:2619
update_process_times+0x1c5/0x280 kernel/time/timer.c:1818
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:254
tick_sched_timer+0xe9/0x110 kernel/time/tick-sched.c:1473
__run_hrtimer kernel/time/hrtimer.c:1690 [inline]
__hrtimer_run_queues+0x64c/0xc00 kernel/time/hrtimer.c:1754
hrtimer_interrupt+0x317/0x7e0 kernel/time/hrtimer.c:1816
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x146/0x430 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:unwind_next_frame+0xd03/0x1d20 arch/x86/kernel/unwind_orc.c:545
Code: 20 84 c0 4c 8b 44 24 28 48 8b 4c 24 30 0f 84 56 07 00 00 48 b8
00 00 00 00 00 fc ff df 48 8b 54 24 08 48 c1 ea 03 80 3c 02 00 <0f> 85
16 0a 00 00 48 8b 14 24 4d 89 4e 38 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90000007568 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 1ffff92000000eb5 RCX: ffffffff8e89bb65
RDX: 1ffff92000000ecf RSI: ffffc9000dccf678 RDI: ffffc9000dccf678
RBP: 0000000000000001 R08: ffffffff8e89bb60 R09: ffffc9000dccf680
R10: fffff52000000ed3 R11: 000000000008e07d R12: ffffc90000007688
R13: ffffc90000007675 R14: ffffc90000007640 R15: ffffffff8e89bb64
arch_stack_walk+0x87/0xe0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x92/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x2a/0x50 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc+0x7f/0xa0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:604 [inline]
dst_cow_metrics_generic+0x48/0x1e0 net/core/dst.c:202
dst_metrics_write_ptr include/net/dst.h:118 [inline]
dst_metric_set include/net/dst.h:179 [inline]
icmp6_dst_alloc+0x4ee/0x670 net/ipv6/route.c:3281
ndisc_send_skb+0x10b4/0x1570 net/ipv6/ndisc.c:493
ndisc_send_rs+0x12f/0x690 net/ipv6/ndisc.c:707
addrconf_rs_timer+0x413/0x810 net/ipv6/addrconf.c:3957
call_timer_fn+0x1a5/0x580 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x75d/0xb20 kernel/time/timer.c:1767
run_timer_softirq+0x54/0xd0 kernel/time/timer.c:1780
handle_softirqs+0x21a/0x950 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0xed/0x190 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1108
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1170 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0x21/0x150 kernel/rcu/tree.c:1162
Code: 00 48 8b 14 24 eb c8 66 90 65 8b 15 39 81 9e 7e 81 e2 00 00 f0
00 b8 01 00 00 00 75 0a 8b 15 f2 2b a2 0c 85 d2 75 01 c3 55 53 <65> ff
05 18 81 9e 7e e8 f3 fc 53 08 48 c7 c3 40 b5 03 00 83 f8 07
RSP: 0018:ffffc9000dccf660 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff88801cdf0000 RCX: 0000000000000001
RDX: 0000000000000001 RSI: ffffffff8a640000 RDI: ffffffff8bc7b8c0
RBP: ffff88806b299000 R08: 0000000000000000 R09: ffffffff93062a27
R10: fffffbfff260c544 R11: 1ffff11003dd908a R12: 0000000000000cc0
R13: 0000000000000001 R14: ffffffff81d2f5eb R15: 0000000000000000
rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
rcu_read_lock_held+0x1f/0x40 kernel/rcu/update.c:309
task_css.constprop.0+0xc9/0x130 include/linux/cgroup.h:496
mem_cgroup_from_task mm/memcontrol.c:935 [inline]
get_obj_cgroup_from_current+0x120/0x510 mm/memcontrol.c:2926
memcg_slab_pre_alloc_hook mm/slab.h:283 [inline]
slab_pre_alloc_hook mm/slab.h:497 [inline]
slab_alloc_node mm/slub.c:3134 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x76/0x2f0 mm/slub.c:3233
__d_alloc+0x2b/0x8e0 fs/dcache.c:1749
d_alloc+0x4a/0x220 fs/dcache.c:1828
d_alloc_parallel+0xdd/0x1c70 fs/dcache.c:2582
lookup_open.isra.0+0xb06/0x1660 fs/namei.c:3387
open_last_lookups fs/namei.c:3532 [inline]
path_openat+0xad1/0x2c00 fs/namei.c:3739
do_filp_open+0x1d4/0x430 fs/namei.c:3769
do_sys_openat2+0x185/0x4f0 fs/open.c:1253
do_sys_open fs/open.c:1269 [inline]
__do_sys_openat fs/open.c:1285 [inline]
__se_sys_openat fs/open.c:1280 [inline]
__x64_sys_openat+0x171/0x210 fs/open.c:1280
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x46a4e4
Code: 24 20 eb 8f 66 90 44 89 54 24 0c e8 06 d9 02 00 44 8b 54 24 0c
44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d
00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 48 d9 02 00 8b 44
RSP: 002b:00007f2a6d102f60 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000046a4e4
RDX: 0000000000000002 RSI: 00007f2a6d102ff0 RDI: 00000000ffffff9c
RBP: 00007f2a6d102ff0 R08: 0000000000000000 R09: 00007f2a6d102e70
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
R13: 00000000004e9478 R14: 00007f2a6d1035f4 R15: 00000000ffffffff
</TASK>
https://drive.google.com/file/d/13nr1pPRHCrZqYxz08ngNiCvmcRe-d_oK/view?usp=drive_link
https://drive.google.com/file/d/1RHa5bKm8YN-h9wRh_dJH0q1ZBF5mzYOh/view?usp=drive_link
https://drive.google.com/file/d/15HyqruIzxnkYVh4FXjmU-yY_zTB8kwPI/view?usp=drive_link
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