rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=7329, q=74 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294955299-4294944796), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g7329 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:27760 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 schedule+0xb9/0x180 kernel/sched/core.c:6638
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </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: 4277 Comm: syz-executor360 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3718 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3738 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3793 [inline]
RIP: 0010:__lock_acquire+0x1458/0x7d10 kernel/locking/lockdep.c:5049
Code: 00 00 00 42 80 3c 00 00 74 12 4c 89 e7 e8 20 2b 6f 00 49 b8 00 00 00 00 00 fc ff df 49 8b 1c 24 48 85 db 0f 94 c0 48 83 c3 f8 <0f> 94 c1 08 c1 4c 89 b4 24 90 00 00 00 0f 84 99 02 00 00 e8 c0 a5
RSP: 0018:ffffc900001e09c0 EFLAGS: 00000093
RAX: 1ffffffff20edf00 RBX: ffffffff90aface0 RCX: ffffffff816455ff
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90af9248
RBP: ffffc900001e0c10 R08: dffffc0000000000 R09: 1ffffffff215f249
R10: dffffc0000000000 R11: fffffbfff215f24a R12: ffffffff9076fc48
R13: 00000000687715fc R14: e2a3ab267825be18 R15: ffff88803019e410
FS:  00007fb49fa4b6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 0000000077420000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662
 seqcount_lockdep_reader_access+0xcd/0x1d0 include/linux/seqlock.h:102
 ktime_get_update_offsets_now+0x44/0x3e0 kernel/time/timekeeping.c:2317
 hrtimer_update_base kernel/time/hrtimer.c:659 [inline]
 hrtimer_interrupt+0x130/0x9c0 kernel/time/hrtimer.c:1855
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 00 00 00 66 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 0e b0 2c f7 48 89 df e8 56 78 2d f7 e8 21 cf 50 f7 fb bf 01 00 00 00 <e8> a6 dc 20 f7 65 8b 05 f7 5f ca 75 85 c0 74 02 5b c3 e8 44 74 c8
RSP: 0018:ffffc90003e47b98 EFLAGS: 00000282
RAX: 059ace86e0132000 RBX: ffff88802d8b65c0 RCX: 059ace86e0132000
RDX: dffffc0000000000 RSI: ffffffff8a8c1120 RDI: 0000000000000001
RBP: ffff88802d8b6a58 R08: ffff88802d8b65c3 R09: 1ffff11005b16cb8
R10: dffffc0000000000 R11: ffffed1005b16cb9 R12: 1ffff11005b16d4b
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1163/0x1350 kernel/signal.c:2874
 arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb49fa6b057
Code: 00 85 c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d0 ff ff ff f7 d8 64 89
RSP: 002b:00007fb49fa4b218 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fb49fb1bb28 RCX: 00007fb49fa6b059
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb49fb1bb28
RBP: 00007fb49fb1bb20 R08: 34203a6b63617473 R09: 34203a6b63617473
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000140
R13: 000020000006b000 R14: 0000200000000100 R15: 0000200000000680
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.100 msecs