rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=7373, q=12 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4294965624-4294955123), 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=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:24176 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x177f/0x4960 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6817
 schedule_timeout+0x1bd/0x300 kernel/time/timer.c:2183
 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: 5096 Comm: syz-executor421 Not tainted 6.8.0-rc1-syzkaller-00026-g7ed2632ec7d7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:hlock_class kernel/locking/lockdep.c:240 [inline]
RIP: 0010:__lock_acquire+0x126e/0x1fd0 kernel/locking/lockdep.c:5134
Code: 18 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 e0 73 df 90 be 08 00 00 00 e8 ec 3b 7e 00 48 0f a3 1d 54 d0 71 0f 73 1d <48> 69 c3 c8 00 00 00 48 8d 98 e0 d2 ad 90 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90000007890 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 00000000000000a8 RCX: ffffffff816da384
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90df73f0
RBP: 871f39c1dff1d4a7 R08: ffffffff90df73f7 R09: 1ffffffff21bee7e
R10: dffffc0000000000 R11: fffffbfff21bee7f R12: ffff888073c19dc0
R13: ffff888073c19dc0 R14: 0000000000000000 R15: ffff888073c19dc0
FS:  0000555555ba43c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002006b000 CR3: 00000000743c5000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 reacquire_held_locks+0x3eb/0x690 kernel/locking/lockdep.c:5279
 __lock_release kernel/locking/lockdep.c:5468 [inline]
 lock_release+0x36f/0x9c0 kernel/locking/lockdep.c:5774
 rcu_lock_release include/linux/rcupdate.h:308 [inline]
 rcu_read_unlock include/linux/rcupdate.h:783 [inline]
 __lock_task_sighand+0x2b4/0x2d0 kernel/signal.c:1418
 lock_task_sighand include/linux/sched/signal.h:748 [inline]
 send_sigqueue+0x25c/0x760 kernel/signal.c:1987
 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:649
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 aa 9a 3c f6 48 89 df e8 32 d5 3d f6 e8 9d e1 64 f6 fb bf 01 00 00 00 <e8> b2 f2 2f f6 65 8b 05 63 a8 d2 74 85 c0 74 02 5b c3 e8 10 71 cf
RSP: 0018:ffffc900044afc70 EFLAGS: 00000282
RAX: 8cb1fef39027eb00 RBX: ffff88802831d340 RCX: ffffffff925ef303
RDX: dffffc0000000000 RSI: ffffffff8b6aa5e0 RDI: 0000000000000001
RBP: ffffc900044afdb0 R08: ffffffff8f0232ef R09: 1ffffffff1e0465d
R10: dffffc0000000000 R11: fffffbfff1e0465e R12: 1ffff11005063afb
R13: 000000001c000004 R14: 0000000000000021 R15: ffff88802831d7d8
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1569/0x1840 kernel/signal.c:2896
 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+0xc8/0x370 kernel/entry/common.c:212
 do_syscall_64+0x102/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fcc49338e79
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:00007fffe029b2a8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fcc49338e79
RDX: 000000002006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000555555ba4370
R13: 0000000000000005 R14: 00007fffe029b320 R15: 00007fffe029b310
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.417 msecs