rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=7845, q=183 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294954551-4294944048), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g7845 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:27464 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7145
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7169
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0xfd/0x110 kernel/locking/spinlock.c:194
 debug_object_assert_init+0x20e/0x380 lib/debugobjects.c:1009
 debug_timer_assert_init kernel/time/timer.c:803 [inline]
 debug_assert_init kernel/time/timer.c:848 [inline]
 __try_to_del_timer_sync+0x29/0x3a0 kernel/time/timer.c:1457
 __timer_delete_sync+0x1fe/0x2d0 kernel/time/timer.c:1620
 schedule_timeout+0x133/0x270 kernel/time/sleep_timeout.c:100
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 UID: 0 PID: 6105 Comm: syz.3.21 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x11/0x70 kernel/kcov.c:217
Code: 5b e9 33 e2 58 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 c0 e5 92 <65> 8b 15 48 f1 24 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc90000a08e60 EFLAGS: 00000097
RAX: ffffffff81b29ad6 RBX: 00000028a3650b00 RCX: ffff888028899e00
RDX: ffff888028899e00 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 0000000000000000 R08: ffff8880b8727a83 R09: 1ffff110170e4f50
R10: dffffc0000000000 R11: ffffed10170e4f51 R12: 7fffffffffffffff
R13: dffffc0000000000 R14: ffff8880b8723900 R15: 0000000000000003
FS:  00007f23b44c56c0(0000) GS:ffff8881258c4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000007cba4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 tick_program_event+0x86/0x120 kernel/time/tick-oneshot.c:36
 hrtimer_interrupt+0x620/0xaa0 kernel/time/hrtimer.c:1900
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 5a db 15 f6 48 89 df e8 b2 72 16 f6 e8 7d c0 3f f6 fb bf 01 00 00 00 <e8> 12 6d 08 f6 65 8b 05 1b 07 5d 07 85 c0 74 07 5b e9 81 4c 00 00
RSP: 0018:ffffc900039e7c80 EFLAGS: 00000282
RAX: d4df1f1edf3c7700 RBX: ffff88802e37c0c0 RCX: d4df1f1edf3c7700
RDX: 0000000000000000 RSI: ffffffff8c04e5e0 RDI: 0000000000000001
RBP: 0000000000000021 R08: ffffffff8fe52d37 R09: 1ffffffff1fca5a6
R10: dffffc0000000000 R11: fffffbfff1fca5a7 R12: 1ffff11005c6f8ab
R13: 0000000000000000 R14: 000000001c000004 R15: ffff88802e37c558
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x11a8/0x1340 kernel/signal.c:3037
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f23b358ebe7
Code: ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89
RSP: 002b:00007f23b44c50e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f23b37c5fa8 RCX: 00007f23b358ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f23b37c5fa8
RBP: 00007f23b37c5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f23b37c6038 R14: 00007ffea4225880 R15: 00007ffea4225968
 </TASK>