rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=7789, q=17 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4294970340-4294959839), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g7789 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:27664 pid:16    tgid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6838
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2582
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:1663
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:1862
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 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: 5115 Comm: syz-executor324 Not tainted 6.9.0-rc4-syzkaller-00266-g977b1ef51866 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:__lock_acquire+0xc4c/0x3b30 kernel/locking/lockdep.c:5133
Code: 14 02 48 c7 c0 94 64 9f 8f 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 31 2c 00 00 8b 1d 01 be 33 0e 85 db 75 40 44 8b 5c 24 10 <45> 85 db 0f 85 11 07 00 00 4c 89 f7 e8 23 4e ff ff 48 ba 00 00 00
RSP: 0018:ffffc90000a08a88 EFLAGS: 00000046
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff816ba90a
RDX: 0000000000000000 RSI: ffff888077948ad8 RDI: 00000000dab347d6
RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff27bb032
R10: ffffffff93dd8197 R11: 0000000000000003 R12: ffffed100ef2915a
R13: 00000000000000b2 R14: ffff888077948b50 R15: 0000000000000002
FS:  0000555576a7a3c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f67af00d4c0 CR3: 0000000078200000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 __lock_task_sighand+0xc2/0x340 kernel/signal.c:1414
 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:1692 [inline]
 __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1756
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1818
 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 ba 2f 8d f6 48 89 df e8 12 ac 8d f6 e8 5d 32 b6 f6 fb bf 01 00 00 00 <e8> e2 e9 7e f6 65 8b 05 c3 2c 25 75 85 c0 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc900032efcf0 EFLAGS: 00000202
RAX: 0000000003951489 RBX: ffff888021c38940 RCX: 1ffffffff1f3ddc9
RDX: 0000000000000000 RSI: ffffffff8b0cae00 RDI: 0000000000000001
RBP: ffff888021c38d40 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8f9f30d7 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000021 R14: ffff888021c38940 R15: ffff888021c38940
 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: 0033:0x7f67aeff5e79
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 18 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 01 48
RSP: 002b:00007ffc18bb60a8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f67aeff5e79
RDX: 000000002006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000555576a7a370
R13: 0000000000000000 R14: 00007ffc18bb6120 R15: 00007ffc18bb6110
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.102 msecs