rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=7373, q=8 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294968892-4294958390), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g7373 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:28752 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </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: 5127 Comm: syz-executor119 Not tainted 6.9.0-syzkaller-10323-g8f6a15f095a6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:lock_acquire+0x1fc/0x560 kernel/locking/lockdep.c:5722
Code: 85 ea 02 00 00 9c 58 f6 c4 02 0f 85 d5 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 <48> c7 43 08 00 00 00 00 48 8b 84 24 a8 00 00 00 65 48 2b 04 25 28
RSP: 0018:ffffc90000a18bf0 EFLAGS: 00000082
RAX: dffffc0000000000 RBX: fffff52000143180 RCX: 0000000003f9ae25
RDX: 0000000000000001 RSI: ffffffff8b2cae60 RDI: ffffffff8b8feec0
RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff284e250
R10: ffffffff94271287 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8dbb1760 R15: 0000000000000000
FS:  00005555895323c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbef1b9c4c0 CR3: 00000000745b4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 rcu_read_lock include/linux/rcupdate.h:781 [inline]
 __lock_task_sighand+0x45/0x340 kernel/signal.c:1397
 lock_task_sighand include/linux/sched/signal.h:746 [inline]
 send_sigqueue+0x1d4/0x850 kernel/signal.c:1997
 posix_timer_event kernel/time/posix-timers.c:298 [inline]
 posix_timer_fn+0x181/0x3e0 kernel/time/posix-timers.c:324
 __run_hrtimer kernel/time/hrtimer.c:1687 [inline]
 __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1751
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1813
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
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 8b 74 24 08 48 89 fb 48 83 c7 18 e8 0a bc 7e f6 48 89 df e8 f2 38 7f f6 e8 8d 29 a8 f6 fb bf 01 00 00 00 <e8> e2 78 70 f6 65 8b 05 53 c5 16 75 85 c0 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc90003247cf0 EFLAGS: 00000206
RAX: 00000000039b3211 RBX: ffff88802985c0c0 RCX: 1ffffffff1fc8069
RDX: 0000000000000000 RSI: ffffffff8b2cab60 RDI: 0000000000000001
RBP: ffff88802985c4c0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8fe445d7 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000021 R14: ffff88802985c0c0 R15: ffff88802985c0c0
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1e3e/0x2710 kernel/signal.c:2914
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x14a/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xdc/0x260 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbef1b50058
Code: 3c 25 10 b0 06 20 31 c0 bf df 00 00 00 48 c7 04 25 08 b0 06 20 08 00 00 00 48 c7 04 25 18 b0 06 20 09 00 00 00 e8 08 4e 03 00 <89> df 83 c3 01 e8 4e 3f 03 00 83 fb 1e 75 f1 31 ff e8 a2 7a 00 00
RSP: 002b:00007ffdcff40550 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fbef1b84e79
RDX: 000000002006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000555589532370
R13: 0000000000000000 R14: 00007ffdcff405c0 R15: 00007ffdcff405b0
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.687 msecs