rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=7345, q=6 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294967054-4294956551), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g7345 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:26256 pid:16    tgid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x17d3/0x4a20 kernel/sched/core.c:6736
 __schedule_loop kernel/sched/core.c:6813 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6828
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2572
 rcu_gp_fqs_loop+0x2df/0x1370 kernel/rcu/tree.c:1663
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1862
 kthread+0x2f2/0x390 kernel/kthread.c:388
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </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: 5125 Comm: syz-executor376 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:__list_add include/linux/list.h:153 [inline]
RIP: 0010:list_add_tail include/linux/list.h:183 [inline]
RIP: 0010:send_sigqueue+0x464/0x760 kernel/signal.c:2020
Code: 8b 66 08 48 8b 7c 24 08 4c 89 e6 4c 89 f2 e8 b3 6a 51 03 84 c0 0f 84 85 00 00 00 e8 16 04 39 00 48 b8 00 00 00 00 00 fc ff df <80> 3c 03 00 74 08 4c 89 ef e8 0e 54 9c 00 48 8b 5c 24 08 49 89 5d
RSP: 0018:ffffc90000007c20 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: 1ffff11005305a30 RCX: ffff888026c51e00
RDX: 0000000080010003 RSI: ffff88802982d178 RDI: ffff88801539dcb0
RBP: ffffc90000007ce8 R08: 0000000000000007 R09: ffffffff815bfd94
R10: 0000000000000002 R11: ffff888026c51e00 R12: ffff88802982d178
R13: ffff88802982d180 R14: ffff88802982d178 R15: ffff888026c51e00
FS:  000055556a7153c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f555427c4c0 CR3: 0000000022360000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 posix_timer_event kernel/time/posix-timers.c:298 [inline]
 posix_timer_fn+0x18a/0x3a0 kernel/time/posix-timers.c:324
 __run_hrtimer kernel/time/hrtimer.c:1692 [inline]
 __hrtimer_run_queues+0x597/0xd00 kernel/time/hrtimer.c:1756
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1818
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x3a0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 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 89 fb 48 83 c7 18 48 8b 74 24 08 e8 0a b4 f2 f5 48 89 df e8 c2 f3 f3 f5 e8 1d 19 1d f6 fb bf 01 00 00 00 <e8> 52 e0 e5 f5 65 8b 05 a3 c4 84 74 85 c0 74 06 5b e9 71 40 00 00
RSP: 0018:ffffc90004657c70 EFLAGS: 00000282
RAX: b59cfe940c4f1600 RBX: ffff8880283765c0 RCX: ffffffff944dd603
RDX: dffffc0000000000 RSI: ffffffff8baac1e0 RDI: 0000000000000001
RBP: ffffc90004657db0 R08: ffffffff8f873a6f R09: 1ffffffff1f0e74d
R10: dffffc0000000000 R11: fffffbfff1f0e74e R12: 1ffff1100506ed4b
R13: 000000001c000004 R14: 0000000000000021 R15: ffff888028376a58
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x156e/0x1850 kernel/signal.c:2910
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:212
 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f5554264e79
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:00007ffc21c8e188 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f5554264e79
RDX: 000000002006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000004 R14: 00007ffc21c8e200 R15: 00007ffc21c8e1f0
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.979 msecs
sched: RT throttling activated