rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: (detected by 0, t=10502 jiffies, g=8461, q=125 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294955643-4294945141), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g8461 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27088 pid:17 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_timer_base+0x49/0x270 kernel/time/timer.c:995
Code: 34 24 49 c1 ee 03 48 89 d8 48 c1 e8 03 48 89 44 24 08 eb 07 e8 48 6a 10 00 f3 90 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 06 <84> c0 0f 85 3d 01 00 00 48 8b 04 24 44 8b 38 44 89 fe 81 e6 00 00
RSP: 0018:ffffc90000167a08 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffffc90000167a58 RCX: ffff88801be58000
RDX: 0000000000000000 RSI: ffffc90000167a58 RDI: ffffc90000167ba0
RBP: 0000000000000000 R08: ffffffff8e4a212f R09: 1ffffffff1c94425
R10: dffffc0000000000 R11: fffffbfff1c94426 R12: dffffc0000000000
R13: 1ffff9200002cf58 R14: 1ffff9200002cf78 R15: 0000000000000000
__try_to_del_timer_sync+0x55/0x280 kernel/time/timer.c:1414
__timer_delete_sync+0x1ff/0x2c0 kernel/time/timer.c:1574
timer_delete_sync kernel/time/timer.c:1629 [inline]
del_timer_sync include/linux/timer.h:200 [inline]
schedule_timeout+0x16a/0x280 kernel/time/timer.c:2169
rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5806 Comm: syz-executor419 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__kasan_check_read+0x0/0x20 mm/kasan/shadow.c:31
Code: 41 5c 41 5d 41 5e 41 5f 5d c3 48 c7 c7 85 9a 78 8c 4c 89 e6 eb 0a 48 c7 c7 25 13 61 8c 48 89 de e8 f5 2a 7f 08 31 ed eb d4 cc <f3> 0f 1e fa 89 f6 48 8b 0c 24 31 d2 e9 df ea ff ff 66 2e 0f 1f 84
RSP: 0018:ffffc900044afee0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 3f4746455e41eb00
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e4a2128
RBP: ffffc900044aff48 R08: ffffffff8e4a212f R09: 1ffffffff1c94425
R10: dffffc0000000000 R11: fffffbfff1c94426 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc900044aff58 R15: 0000000000000027
FS: 00007fef3654a6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000007e163000 CR4: 00000000003506e0
Call Trace:
<TASK>
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
cpumask_test_cpu include/linux/cpumask.h:504 [inline]
cpu_online include/linux/cpumask.h:1082 [inline]
trace_irq_disable+0x28/0xe0 include/trace/events/preemptirq.h:36
local_irq_disable_exit_to_user+0x1d/0x20 include/linux/entry-common.h:191
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x12/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fef36591137
Code: 0b e9 68 fe ff ff 48 83 c4 18 48 8d 3d 02 a4 08 00 5b 5d 41 5c 41 5d 41 5e 41 5f e9 43 b9 fd ff 0f 1f 00 b8 27 00 00 00 0f 05 <c3> 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00
RSP: 002b:00007fef36549b88 EFLAGS: 00000206 ORIG_RAX: 0000000000000027
RAX: 0000000000000004 RBX: 00007fef36549cf0 RCX: 00007fef36591137
RDX: 00007fef36549bc0 RSI: 00007fef36549cf0 RDI: 0000000000000021
RBP: 0000000000000000 R08: 00007fef3654a6c0 R09: 00007fef3654a6c0
R10: 0000000000000000 R11: 0000000000000206 R12: 00007fef366153ec
R13: 0000000000000016 R14: 00007ffc453f0010 R15: 00007ffc453f00f8
</TASK>