rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=5685, q=23)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294954868-4294944366), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g5685 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:27848 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </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: 4197 Comm: syz-executor163 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:771 [inline]
RIP: 0010:__lock_task_sighand+0x268/0x290 kernel/signal.c:1409
Code: 8e 7e 2d 00 eb 24 e8 87 7e 2d 00 c6 05 fc 87 0b 0c 01 48 c7 c7 20 3c 0a 8a be 01 03 00 00 48 c7 c2 c0 3c 0a 8a e8 a8 39 54 08 <e8> e3 0e 1a 00 e8 be 60 01 00 4c 89 f8 48 83 c4 08 5b 41 5c 41 5d
RSP: 0018:ffffc90000007c20 EFLAGS: 00000006
RAX: ffffffff814a4b90 RBX: 0000000000000001 RCX: ffff88801a5dbb80
RDX: 0000000000010000 RSI: ffffffff8a59a4a0 RDI: ffffffff8a59a460
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000003
R10: fffff52000000f60 R11: 1ffff92000000f60 R12: ffff888077368940
R13: ffff88801a7b8928 R14: 1ffff110034f7125 R15: ffff888077368940
FS:  00007f9c5131a6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c51319d80 CR3: 000000007825f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_task_sighand include/linux/sched/signal.h:710 [inline]
 send_sigqueue+0x177/0x620 kernel/signal.c:1975
 posix_timer_event kernel/time/posix-timers.c:360 [inline]
 posix_timer_fn+0x16a/0x3d0 kernel/time/posix-timers.c:386
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x53d/0xc40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f6 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ae dc a9 f7 48 89 df e8 76 b1 aa f7 e8 11 4b cb f7 fb bf 01 00 00 00 <e8> b6 d4 9e f7 65 8b 05 97 d2 4f 76 85 c0 74 02 5b c3 e8 44 dd 4d
RSP: 0018:ffffc900022c7bc0 EFLAGS: 00000282
RAX: b43ac49e0b0fb700 RBX: ffff888077368940 RCX: b43ac49e0b0fb700
RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: 0000000000000001
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100ee6d129
R10: ffffed100ee6d129 R11: 1ffff1100ee6d128 R12: ffff888077368940
R13: 0000000000000021 R14: dffffc0000000000 R15: 000000001c000004
 spin_unlock_irq include/linux/spinlock.h:413 [inline]
 get_signal+0x11d6/0x12c0 kernel/signal.c:2903
 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9c5135a4c7
Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 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
RSP: 002b:00007f9c5131a178 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f9c513e43c8 RCX: 00007f9c5135a4c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f9c513e43c8
RBP: 00007f9c513e43c0 R08: 00007f9c5131a6c0 R09: 00007f9c5131a6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9c513e43cc
R13: 0000000000000000 R14: 00007ffd3669d240 R15: 00007ffd3669d328
 </TASK>