rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=14985, q=863 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294971274-4294960771), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g14985 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:27592 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7413
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
 _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:198
 __try_to_del_timer_sync+0x107/0x160 kernel/time/timer.c:1467
 __timer_delete_sync+0xf7/0x1c0 kernel/time/timer.c:1621
 schedule_timeout+0x12f/0x280 kernel/time/sleep_timeout.c:100
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 UID: 0 PID: 6046 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:trace_hardirqs_on+0x4/0x40 kernel/trace/trace_preemptirq.c:72
Code: 8e e8 90 2b 68 00 e9 57 ff ff ff e8 86 2b 68 00 eb 83 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <65> 8b 05 61 6b 52 12 85 c0 75 0e e8 ec 2a d3 ff 48 8b 3c 24 e9 e3
RSP: 0018:ffffc900036afb88 EFLAGS: 00000096
RAX: 0000000000000000 RBX: ffffc900036afbd8 RCX: 0000000000000000
RDX: ffff888075f04a80 RSI: ffffffff81f5c32b RDI: 0000000000000001
RBP: ffffc900036afbc8 R08: 0000000000000000 R09: ffffed10170a5080
R10: ffff8880b8528403 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f8177d096c0(0000) GS:ffff888123ee8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000076a2a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline]
 irqentry_exit+0x24d/0xa00 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:206
Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 ba 30 29 f6 48 89 df e8 42 80 29 f6 e8 2d e4 55 f6 fb bf 01 00 00 00 <e8> 12 90 18 f6 65 8b 05 5b 39 a7 08 85 c0 74 06 5b e9 81 4a 00 00
RSP: 0018:ffffc900036afc88 EFLAGS: 00000206
RAX: 00000000052d62a3 RBX: ffff888038e45c80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e1a3c59 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000021
R13: ffff888038e46080 R14: dffffc0000000000 R15: ffff888075f04a80
 spin_unlock_irq include/linux/spinlock.h:402 [inline]
 get_signal+0x195a/0x21e0 kernel/signal.c:3049
 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8176d9de57
Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89
RSP: 002b:00007f8177d090e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f8177025fa8 RCX: 00007f8176d9de59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f8177025fa8
RBP: 00007f8177025fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8177026038 R14: 00007ffeff211320 R15: 00007ffeff211408
 </TASK>