rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=8541, q=156 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10458 (4294955865-4294945407), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10458 jiffies! g8541 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:26712 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6561
 schedule+0xbf/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </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 PID: 4165 Comm: syz.0.133 Not tainted 6.1.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:__lock_release kernel/locking/lockdep.c:5367 [inline]
RIP: 0010:lock_release+0x33d/0xa20 kernel/locking/lockdep.c:5682
Code: 4c 89 e7 48 89 d3 e8 12 8e 77 00 48 89 da 4d 8b 34 24 48 8b 5c 24 10 48 81 c3 d0 0a 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <74> 14 48 89 df 4d 89 fc 49 89 d7 e8 63 8e 77 00 4c 89 fa 4d 89 e7
RSP: 0018:ffffc90000007aa0 EFLAGS: 00000046
RAX: 1ffff1100fd2215a RBX: ffff88807e910ad0 RCX: ffffc90000007b03
RDX: 0000000000000002 RSI: ffff88807e910ad8 RDI: ffff88807e910b30
RBP: ffffc90000007bc8 R08: dffffc0000000000 R09: fffffbfff1d337ae
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807e910b30
R13: 0000000000000003 R14: 3f711164037fdfaf R15: dffffc0000000000
FS:  00007fde829706c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000294c8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 rcu_lock_release include/linux/rcupdate.h:355 [inline]
 rcu_read_unlock include/linux/rcupdate.h:824 [inline]
 __lock_task_sighand+0x2b0/0x2d0 kernel/signal.c:1415
 lock_task_sighand include/linux/sched/signal.h:745 [inline]
 send_sigqueue+0x1de/0x720 kernel/signal.c:1978
 posix_timer_event kernel/time/posix-timers.c:354 [inline]
 posix_timer_fn+0x186/0x390 kernel/time/posix-timers.c:380
 __run_hrtimer kernel/time/hrtimer.c:1686 [inline]
 __hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1750
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x156/0x580 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: a1 9d f5 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 9e 55 bb f6 48 89 df e8 06 93 bc f6 e8 91 21 e2 f6 fb bf 01 00 00 00 <e8> 56 26 af f6 65 8b 05 77 32 53 75 85 c0 74 02 5b c3 e8 24 56 51
RSP: 0018:ffffc9000a5f7b30 EFLAGS: 00000286
RAX: 23d99b4a62129000 RBX: ffff888057609280 RCX: ffffffff91f31103
RDX: dffffc0000000000 RSI: ffffffff8b0c0240 RDI: 0000000000000001
RBP: ffffc9000a5f7c70 R08: dffffc0000000000 R09: ffffed100aec1251
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100aec12e3
R13: 000000001c000004 R14: 0000000000000021 R15: ffff888057609718
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x154b/0x17d0 kernel/signal.c:2865
 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fde81b77297
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:00007fde82970048 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fde81d05f80 RCX: 00007fde81b77299
RDX: 0000000000000000 RSI: 0000800000000006 RDI: 0000000020001300
RBP: 00007fde81be48e6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fde81d05f80 R15: 00007fff271f26c8
 </TASK>