rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=73369, q=534 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4295016522-4295006022), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10500 jiffies! g73369 f0x2 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:27200 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7193
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_gp_fqs_loop+0x304/0x1540 kernel/rcu/tree.c:2083
Code: 41 f6 c7 02 75 26 48 83 3d 10 66 6b 0c 00 75 0a 48 83 3d 86 66 6b 0c 00 74 12 48 85 db 74 0d 48 89 df e8 0f 53 b7 09 48 89 c3 <eb> ad 48 c7 c7 18 4c 14 8e 48 8d b4 24 c0 00 00 00 e8 06 b5 f2 ff
RSP: 0000:ffffc90000157b20 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801da85b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000157c70 R08: ffffffff8fa22f77 R09: 1ffffffff1f445ee
R10: dffffc0000000000 R11: fffffbfff1f445ef R12: ffffffff8e144bc0
R13: ffff88801be9b400 R14: ffffc90000157be8 R15: 0000000000000000
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15421 Comm: syz.2.1869 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:check_preemption_disabled+0x49/0x120 lib/smp_processor_id.c:53
Code: 8b 0d bb e1 41 07 f7 c1 ff ff ff 7f 74 23 65 48 8b 0d 9b e1 41 07 48 3b 4c 24 08 0f 85 cc 00 00 00 48 83 c4 10 5b 41 5e 41 5f <5d> e9 81 cd 02 00 cc 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24
RSP: 0018:ffffc90000007fa0 EFLAGS: 00000086
RAX: 0000000000000000 RBX: 0000000000000000 RCX: b78950ab382a6600
RDX: 0000000000000000 RSI: ffffffff8be07940 RDI: ffffffff8be07900
RBP: 0000000000000000 R08: ffffffff8fa22f77 R09: 1ffffffff1f445ee
R10: dffffc0000000000 R11: fffffbfff1f445ef R12: dffffc0000000000
R13: 0000000000000000 R14: 1ffff110170c47c8 R15: 0000000000000000
FS:  00005555627b8500(0000) GS:ffff888125c25000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeeda2f0d0 CR3: 000000003a7b4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
 rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:751
 trace_local_timer_exit arch/x86/include/asm/trace/irq_vectors.h:40 [inline]
 __sysvec_apic_timer_interrupt+0x13d/0x3e0 arch/x86/kernel/apic/apic.c:1063
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </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 1a 4e 3e f6 48 89 df e8 52 c5 3e f6 e8 4d 43 69 f6 fb bf 01 00 00 00 <e8> 82 ba 30 f6 65 8b 05 db 5f 3f 07 85 c0 74 07 5b e9 c1 4b 00 00
RSP: 0018:ffffc900050a7c60 EFLAGS: 00000286
RAX: b78950ab382a6600 RBX: ffff88802dac8940 RCX: b78950ab382a6600
RDX: 0000000000000000 RSI: ffffffff8d997e54 RDI: 0000000000000001
RBP: 0000000000000011 R08: ffffffff8fa22f77 R09: 1ffffffff1f445ee
R10: dffffc0000000000 R11: fffffbfff1f445ef R12: 1ffff11005b5917b
R13: 0000000000000000 R14: 0000000004000000 R15: ffff88802dac8bd8
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x11a7/0x1340 kernel/signal.c:3037
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbacb384d97
Code: 24 08 64 48 2b 14 25 28 00 00 00 75 05 48 83 c4 18 c3 e8 2c dc 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8b 05 71 e9 22 00 <48> 85 c0 74 14 48 83 ec 08 ff d0 85 c0 75 1a 31 c0 48 83 c4 08 c3
RSP: 002b:00007ffd7bc66eb8 EFLAGS: 00000246
RAX: 00007fbacc2a5a90 RBX: 00000000000a8b54 RCX: ffffffffffffffa8
RDX: 0000000000000000 RSI: 00007ffd7bc66fd0 RDI: 0000000000000001
RBP: 0000000000000032 R08: 3fffffffffffffff R09: 0000001d7bc671af
R10: 00007ffd7bc66fb0 R11: 0000000000000246 R12: 00007fbacb5e5fac
R13: 00007ffd7bc66fb0 R14: 00000000000a8b86 R15: 00007ffd7bc66fd0
 </TASK>