rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=51381, q=26 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10499 (4295044540-4295034041), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10499 jiffies! g51381 f0x2 RCU_GP_CLEANUP(7) ->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:26560 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x142d/0x4550 kernel/sched/core.c:6554
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6723
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6747
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irq+0x3c/0x40 kernel/locking/spinlock.c:202
 rcu_gp_cleanup+0x5be/0xd70 kernel/rcu/tree.c:1776
 rcu_gp_kthread+0xb1/0x3a0 kernel/rcu/tree.c:1864
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </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: 12334 Comm: syz-executor.2 Not tainted 6.1.56-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:228 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:240 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:hlock_class kernel/locking/lockdep.c:228 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4747 [inline]
RIP: 0010:__lock_acquire+0x78c/0x1f80 kernel/locking/lockdep.c:4998
Code: c0 0f 85 2f 01 00 00 41 8b 5d 00 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 20 82 49 90 be 08 00 00 00 e8 44 54 77 00 <48> 0f a3 1d 1c 3c df 0e 73 1b 48 8d 04 5b 48 c1 e0 06 48 8d 98 20
RSP: 0018:ffffc900001e0900 EFLAGS: 00000056
RAX: 0000000000000001 RBX: 000000000000002b RCX: ffffffff816a45fc
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90498220
RBP: ffff88807ebf2910 R08: dffffc0000000000 R09: fffffbfff2093045
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000002
R13: ffff88807ebf2910 R14: 0000000000000002 R15: 0000000000000102
FS:  00007fbbdc9de6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbbdc9ddf80 CR3: 0000000027a6c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
 __lock_task_sighand+0x145/0x2d0 kernel/signal.c:1410
 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:1685 [inline]
 __hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1811
 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:649
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: 41 b7 f5 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 be 0c d7 f6 48 89 df e8 b6 49 d8 f6 e8 01 e1 fd f6 fb bf 01 00 00 00 <e8> 86 da ca f6 65 8b 05 f7 1d 6f 75 85 c0 74 02 5b c3 e8 34 3c 6d
RSP: 0018:ffffc9000abafb30 EFLAGS: 00000286
RAX: 59718a3ba3c8c200 RBX: ffff88807db23780 RCX: ffffffff91c90103
RDX: dffffc0000000000 RSI: ffffffff8aebe220 RDI: 0000000000000001
RBP: ffffc9000abafc70 R08: dffffc0000000000 R09: ffffed100fb646f1
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100fb64783
R13: 000000001c000004 R14: 0000000000000021 R15: ffff88807db23c18
 spin_unlock_irq include/linux/spinlock.h:400 [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:168
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbbdbc7cae7
Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89
RSP: 002b:00007fbbdc9de178 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fbbdbd9bf88 RCX: 00007fbbdbc7cae9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fbbdbd9bf88
RBP: 00007fbbdbd9bf80 R08: 00007fbbdc9de6c0 R09: 00007fbbdc9de6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbbdbd9bf8c
R13: 000000000000000b R14: 00007ffd327b7db0 R15: 00007ffd327b7e98
 </TASK>