rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=6905, q=24 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4294967179-4294956678), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g6905 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:24560 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6778
 schedule_timeout+0x1bd/0x300 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x30a/0x1500 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1830
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </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: 5110 Comm: syz-executor128 Not tainted 6.7.0-rc4-syzkaller-00009-gbee0e7762ad2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4799 [inline]
RIP: 0010:__lock_acquire+0x909/0x1fd0 kernel/locking/lockdep.c:5087
Code: 0d 00 75 23 90 48 c7 c7 80 ac 6a 8b 48 c7 c6 20 af 6a 8b e8 c9 23 e7 ff 48 ba 00 00 00 00 00 fc ff df 90 0f 0b 90 90 90 31 db <48> 8d ab c8 00 00 00 48 89 e8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85
RSP: 0018:ffffc90000007970 EFLAGS: 00000002
RAX: 00000000000559e0 RBX: ffffffff90b02c40 RCX: ffffffff816d33ad
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff90dd7430
RBP: 00000000ffffffff R08: ffffffff90dd7437 R09: 1ffffffff21bae86
R10: dffffc0000000000 R11: fffffbfff21bae87 R12: 0000000000000000
R13: ffff8880252ee420 R14: 0000000000000000 R15: ffff8880252ee420
FS:  0000555555ca43c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0ad793c4c0 CR3: 0000000076f3d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
 rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 rcu_read_lock include/linux/rcupdate.h:747 [inline]
 __lock_task_sighand+0x49/0x2d0 kernel/signal.c:1405
 lock_task_sighand include/linux/sched/signal.h:745 [inline]
 send_sigqueue+0x25c/0x760 kernel/signal.c:1996
 posix_timer_event kernel/time/posix-timers.c:298 [inline]
 posix_timer_fn+0x18a/0x390 kernel/time/posix-timers.c:324
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x59f/0xd20 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x396/0x980 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
 __sysvec_apic_timer_interrupt+0x104/0x3a0 arch/x86/kernel/apic/apic.c:1082
 sysvec_apic_timer_interrupt+0x92/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
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: 00 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 5a 74 4b f6 48 89 df e8 52 af 4c f6 e8 0d 84 73 f6 fb bf 01 00 00 00 <e8> 72 d4 3e f6 65 8b 05 33 e2 e1 74 85 c0 74 02 5b c3 e8 00 b0 de
RSP: 0018:ffffc9000427fc50 EFLAGS: 00000282
RAX: e34f5628cc9b0500 RBX: ffff8880255bef00 RCX: ffffffff925cf303
RDX: dffffc0000000000 RSI: ffffffff8b6aade0 RDI: 0000000000000001
RBP: ffffc9000427fd90 R08: ffffffff8f00b8ef R09: 1ffffffff1e0171d
R10: dffffc0000000000 R11: fffffbfff1e0171e R12: 1ffff11004ab7e73
R13: 000000001c000004 R14: 0000000000000021 R15: ffff8880255bf398
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1569/0x1840 kernel/signal.c:2907
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x69/0x2a0 kernel/entry/common.c:296
 do_syscall_64+0x52/0x110 arch/x86/entry/common.c:88
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f0ad78f0054
Code: 3c 25 10 00 00 20 31 c0 bf df 00 00 00 48 c7 04 25 08 00 00 20 08 00 00 00 48 c7 04 25 18 00 00 20 09 00 00 00 e8 0c 4e 03 00 <89> df 83 c3 01 e8 52 3f 03 00 83 fb 1e 75 f1 31 ff e8 a6 7a 00 00
RSP: 002b:00007ffd4638f620 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f0ad7924e79
RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000555555ca4370
R13: 0000000000000003 R14: 00007ffd4638f690 R15: 00007ffd4638f680
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.694 msecs