rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=cbb/1/0x4000000000000000 softirq=9678/9678 fqs=0 
	(t=10500 jiffies g=11505 q=1)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g11505 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=4589
rcu: rcu_preempt kthread starved for 10500 jiffies! g11505 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28112 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11f0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9a/0x370 kernel/rcu/tree.c:2145
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </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: 5039 Comm: syz.1.239 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:trace_irq_enable_rcuidle+0x0/0x180 include/trace/events/preemptirq.h:40
Code: 00 65 c7 05 b6 0f 84 7e 00 00 00 00 e8 a9 81 dd ff 48 8b 7c 24 08 5b e9 5e f1 40 08 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <55> 41 57 41 56 41 54 53 48 89 f3 49 89 fe e8 3d d9 f9 ff 66 90 e8
RSP: 0018:ffffc900032f7ef0 EFLAGS: 00000046
RAX: ffffffff817f232b RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90003d03000 RSI: 0000000000000000 RDI: ffffffff89c01fc1
RBP: ffffc900032f7f48 R08: ffffffff8d8b0def R09: 1ffffffff1b161bd
R10: dffffc0000000000 R11: fffffbfff1b161be R12: 0000000000000000
R13: 0000000000000000 R14: ffffc900032f7f58 R15: 0000000000000000
FS:  00007f531f35a6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000005640 CR3: 0000000059f27000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 syscall_enter_from_user_mode+0x21/0x70 kernel/entry/common.c:113
 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f53210fbd97
Code: 8d 3d 08 9f 0b 00 e8 58 1d fa ff e8 a3 87 00 00 0f 1f 00 b8 68 00 00 00 0f 05 c3 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 <c3> 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00
RSP: 002b:00007f531f359a48 EFLAGS: 00000206 ORIG_RAX: 0000000000000027
RAX: ffffffffffffffda RBX: 00007f531f359bb0 RCX: 00007f53210fbd97
RDX: 00007f531f359a80 RSI: 00007f531f359bb0 RDI: 0000000000000021
RBP: 0000000000000000 R08: 000000000000007d R09: 0000000000000008
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f532138a038 R14: 00007f5321389fa0 R15: 00007ffe5043c8f8
 </TASK>
NMI backtrace for cpu 0
CPU: 0 PID: 5036 Comm: syz.0.237 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x22d/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31f/0x5f0 kernel/rcu/tree_stall.h:633
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x6ec/0x1120 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:2021
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4b0/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x397/0x8b0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [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 7e d3 93 f7 48 89 df e8 b6 aa 94 f7 e8 31 9b b5 f7 fb bf 01 00 00 00 <e8> 96 c0 88 f7 65 8b 05 07 e8 38 76 85 c0 74 02 5b c3 e8 44 f5 36
RSP: 0018:ffffc900033afb50 EFLAGS: 00000282
RAX: b8cc56c961259b00 RBX: ffff88807c371bc0 RCX: b8cc56c961259b00
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000000001
RBP: ffffc900033afcb0 R08: ffff88807c371bc3 R09: 1ffff1100f86e378
R10: dffffc0000000000 R11: ffffed100f86e379 R12: dffffc0000000000
R13: 1ffff92000675f70 R14: ffff888027825940 R15: 0000000000000020
 set_current_blocked kernel/signal.c:3081 [inline]
 signal_delivered kernel/signal.c:2945 [inline]
 signal_setup_done+0x2e3/0x480 kernel/signal.c:2956
 handle_signal arch/x86/kernel/signal.c:842 [inline]
 arch_do_signal_or_restart+0xec5/0x12a0 arch/x86/kernel/signal.c:869
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ffa083bc590
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 72 2d 07 00 e8 65 65 f9 ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007fff6d7269b8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 00000000000216b3 RCX: 00007ffa0839d019
RDX: 00007fff6d7269c0 RSI: 00007fff6d726af0 RDI: 0000000000000021
RBP: 0000000000000032 R08: 00344cc9c8879d24 R09: 0000000000000000
R10: 00007fff6d727060 R11: 0000000000000246 R12: 00007fff6d727080
R13: 00007ffa08624fac R14: 00000000000216e5 R15: 00007fff6d727060
 </TASK>