rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=4837, q=12 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4294967353-4294956852), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g4837 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:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_timeout+0x137/0x290 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x1ec/0xb10 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0x24b/0x380 kernel/rcu/tree.c:1830
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5114 Comm: syz-executor387 Not tainted 6.7.0-rc3-syzkaller-00048-ge8f60209d6cf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:__lock_acquire+0x3b7/0x3b20 kernel/locking/lockdep.c:5074
Code: e2 12 81 e2 00 00 04 00 09 c8 c1 e3 13 09 d0 44 89 f2 c1 e2 14 09 d8 09 d0 8b 94 24 38 01 00 00 c1 e2 15 09 d0 41 8b 54 24 20 <81> e2 ff 1f 00 00 09 d0 48 89 fa 41 89 44 24 20 48 c1 ea 03 48 b8
RSP: 0018:ffffc900001f0a68 EFLAGS: 00000006
RAX: 00000000000c4000 RBX: 0000000000080000 RCX: 0000000000000000
RDX: 00000000000a40ab RSI: ffff888077418aa4 RDI: ffff888077418b34
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 000000000000000a R11: 0000000000000003 R12: ffff888077418b10
R13: 0000000000000002 R14: 0000000000000000 R15: 00000000000000ab
FS:  0000555555eed3c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f40166cc4c0 CR3: 0000000077b7f000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 reacquire_held_locks+0x20b/0x4c0 kernel/locking/lockdep.c:5279
 __lock_release kernel/locking/lockdep.c:5468 [inline]
 lock_release+0x33c/0x690 kernel/locking/lockdep.c:5774
 rcu_lock_release include/linux/rcupdate.h:306 [inline]
 rcu_read_unlock include/linux/rcupdate.h:780 [inline]
 __lock_task_sighand+0x146/0x340 kernel/signal.c:1427
 lock_task_sighand include/linux/sched/signal.h:745 [inline]
 send_sigqueue+0x1d5/0x840 kernel/signal.c:1996
 posix_timer_event kernel/time/posix-timers.c:298 [inline]
 posix_timer_fn+0x181/0x3d0 kernel/time/posix-timers.c:324
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x203/0xc20 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
 __sysvec_apic_timer_interrupt+0x105/0x400 arch/x86/kernel/apic/apic.c:1082
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
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 4a e7 e4 f6 48 89 df e8 b2 5e e5 f6 e8 fd 1d 0b f7 fb bf 01 00 00 00 <e8> d2 17 d7 f6 65 8b 05 a3 97 80 75 85 c0 74 02 5b c3 e8 70 5b 7d
RSP: 0018:ffffc9000472fd00 EFLAGS: 00000202
RAX: 0000000003bf12b3 RBX: ffff888026c02e40 RCX: 1ffffffff1e320f1
RDX: 0000000000000000 RSI: ffffffff8accb7e0 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8f193a17 R11: 0000000000000000 R12: ffff888026c032d8
R13: 0000000000000021 R14: ffff888026c03240 R15: 1ffff920008e5faf
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1899/0x2790 kernel/signal.c:2907
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x121/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296
 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:88
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f40166b4e79
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:00007ffea3fed498 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f40166b4e79
RDX: 000000002006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000555555eed370
R13: 0000000000000005 R14: 00007ffea3fed510 R15: 00007ffea3fed500
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.104 msecs