rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=31ac/1/0x4000000000000000 softirq=65003/65004 fqs=0
	(detected by 0, t=10502 jiffies, g=85389, q=236 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 20130 Comm: syz.7.3886 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:check_preemption_disabled+0x3/0x110 lib/smp_processor_id.c:13
Code: bc 8d 4c 89 f6 e8 2d 80 03 fa e9 6e ff ff ff 00 00 cc cc 00 00 cc cc 48 c7 c7 80 71 ff 8a 48 c7 c6 c0 71 ff 8a eb 00 55 41 57 <41> 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65
RSP: 0018:ffffc900001e0ae8 EFLAGS: 00000096
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff8164192d
RDX: 0000000000000000 RSI: ffffffff8aac2b20 RDI: ffffffff8aff71e0
RBP: ffffc900001e0c08 R08: dffffc0000000000 R09: 1ffffffff236e048
R10: dffffc0000000000 R11: fffffbfff236e049 R12: 1ffff9200003c16c
R13: 0000000000000001 R14: 0000000000000046 R15: dffffc0000000000
FS:  00007f0ab9a906c0(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0ab9a8fff8 CR3: 000000004819b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
 lock_acquire+0x1cc/0x4a0 kernel/locking/lockdep.c:5792
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
 debug_object_activate+0x68/0x4f0 lib/debugobjects.c:747
 debug_hrtimer_activate kernel/time/hrtimer.c:448 [inline]
 debug_activate kernel/time/hrtimer.c:502 [inline]
 enqueue_hrtimer+0x37/0x410 kernel/time/hrtimer.c:1097
 __run_hrtimer kernel/time/hrtimer.c:1768 [inline]
 __hrtimer_run_queues+0x63e/0xc90 kernel/time/hrtimer.c:1815
 hrtimer_interrupt+0x399/0x980 kernel/time/hrtimer.c:1877
 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_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 6f b1 13 f7 65 8b 05 30 61 bd 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc900052dfb80 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: 15b0e034ae9e2400
RDX: dffffc0000000000 RSI: ffffffff8aac19a0 RDI: 0000000000000001
RBP: ffffc900052dfc10 R08: ffffffff91b70247 R09: 1ffffffff236e048
R10: dffffc0000000000 R11: fffffbfff236e049 R12: dffffc0000000000
R13: ffff8880b8c2a5c0 R14: ffff8880b8c2a5c0 R15: 1ffff92000a5bf70
 clock_was_set+0x17c/0x8d0 kernel/time/hrtimer.c:984
 do_settimeofday64+0x597/0x740 kernel/time/timekeeping.c:1345
 __do_sys_clock_settime kernel/time/posix-timers.c:1125 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1113 [inline]
 __x64_sys_clock_settime+0x25a/0x2a0 kernel/time/posix-timers.c:1113
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0ab8b9f559
Code: 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 01 48
RSP: 002b:00007f0ab9a90028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f0ab8e25fa0 RCX: 00007f0ab8b9f559
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000000
RBP: 00007f0ab8c36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0ab8e26038 R14: 00007f0ab8e25fa0 R15: 00007fff90932bb8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g85389 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=40700
rcu: rcu_preempt kthread starved for 10502 jiffies! g85389 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28112 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1350 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:
CPU: 0 PID: 20128 Comm: syz.7.3886 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_many_cond+0x1148/0x1250 kernel/smp.c:998
Code: 41 8b 1f 89 de 83 e6 01 31 ff e8 53 02 0b 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 0a e8 df fe 0a 00 e9 34 ff ff ff f3 90 <41> 0f b6 04 1c 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 17 ff ff ff
RSP: 0000:ffffc90004e2f820 EFLAGS: 00000293
RAX: ffffffff817747c3 RBX: dffffc0000000000 RCX: ffff8880736f1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90004e2f980 R08: ffffffff91b70247 R09: 1ffffffff236e048
R10: dffffc0000000000 R11: fffffbfff236e049 R12: 1ffff110171a820d
R13: ffff8880b8c3bd80 R14: 0000000000000001 R15: ffff8880b8d41068
FS:  000055555ee5c500(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0ab8e22000 CR3: 000000004819b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1165
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:87 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:970 [inline]
 flush_tlb_mm_range+0x409/0x620 arch/x86/mm/tlb.c:1058
 flush_tlb_page arch/x86/include/asm/tlbflush.h:241 [inline]
 ptep_clear_flush+0x11c/0x160 mm/pgtable-generic.c:98
 wp_page_copy+0xada/0x1660 mm/memory.c:3219
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x1b1b/0x3d40 mm/memory.c:5292
 do_user_addr_fault+0x58e/0xb20 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f0ab8a67b23
Code: 53 48 83 ec 38 80 3d fb a4 3b 00 00 89 7c 24 18 48 89 74 24 28 0f 85 cd 09 00 00 80 3d cb db ee 00 00 49 89 f1 41 89 d2 89 cb <c6> 05 d6 a4 3b 00 01 41 89 d7 0f 85 45 04 00 00 80 3d 96 db ee 00
RSP: 002b:00007fff90932c60 EFLAGS: 00010202
RAX: 00007f0ab8e26090 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 00007f0ab8e26128 RDI: 0000000000000001
RBP: 00007f0ab8e260a0 R08: 0000000000000001 R09: 00007f0ab8e26128
R10: 0000000000000003 R11: 0000000000000000 R12: 00007f0ab8e26090
R13: 0000200000000000 R14: 00007fff90932cd8 R15: 00007f0ab8e26090
 </TASK>