rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=127c/1/0x4000000000000000 softirq=19378/19379 fqs=21
rcu: 	(detected by 0, t=10502 jiffies, g=18789, q=2105 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5997 Comm: syz-executor225 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__remove_hrtimer+0x17e/0x3e0 kernel/time/hrtimer.c:1156
Code: 1f 0f 87 f7 01 00 00 e8 b0 eb 12 00 bb fe ff ff ff 44 89 e1 d3 c3 48 8b 44 24 08 4c 8d 60 44 4c 89 e0 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 ea 01 00 00 41 21 1c 24 4d 85 ed 0f 85 76 ff ff ff 4d
RSP: 0018:ffffc90000a08d90 EFLAGS: 00000013
RAX: 0000000000000000 RBX: 00000000fffffff7 RCX: 0000000000000003
RDX: 0000000000010000 RSI: 0000000000000003 RDI: 0000000000000020
RBP: dffffc0000000000 R08: ffff8880741ca327 R09: ffff8880741ca318
R10: dffffc0000000000 R11: ffffed100e839465 R12: ffff8880b8728204
R13: 0000000000000000 R14: ffff8880741ca300 R15: ffff8880b8728400
FS:  000055558d427400(0000) GS:ffff888125277000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ec782f12d CR3: 0000000074e56000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:2012 [inline]
 __hrtimer_run_queues+0x295/0xa10 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 7d 38 ea f5 f7 c3 00 02 00 00 74 05 e8 70 98 15 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> f4 76 db f5 65 8b 05 8d a4 92 07 85 c0 74 18 5b 41 5e e9 5c 55
RSP: 0018:ffffc900024dfc08 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000080000001
RDX: 0000000000000007 RSI: ffffffff8e0407f8 RDI: 0000000000000001
RBP: ffffc900024dfd30 R08: ffffffff90372437 R09: 1ffffffff206e486
R10: dffffc0000000000 R11: fffffbfff206e487 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880b86281c0 R15: ffff8880b86281c0
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:573 [inline]
 clock_was_set+0x62b/0x7e0 kernel/time/hrtimer.c:997
 do_settimeofday64+0x34e/0x590 kernel/time/timekeeping.c:1684
 __do_sys_clock_settime kernel/time/posix-timers.c:1139 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1123 [inline]
 __x64_sys_clock_settime+0x253/0x2a0 kernel/time/posix-timers.c:1123
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ec78555e1
Code: 89 02 b8 ff ff ff ff c3 48 c7 c0 d8 ff ff ff 64 c7 00 26 00 00 00 eb ea 90 48 81 7e 08 ff c9 9a 3b 77 2e b8 e3 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 07 c3 66 0f 1f 44 00 00 48 c7 c2 d8 ff ff ff
RSP: 002b:00007ffc4908b578 EFLAGS: 00000297 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007ffc4908b590 RCX: 00007f9ec78555e1
RDX: 000000006a75ed12 RSI: 00007ffc4908b590 RDI: 0000000000000000
RBP: 00007ffc4908b5c0 R08: 000000001ac23398 R09: 3fffffffffffffff
R10: 4000000000000000 R11: 0000000000000297 R12: 0000000000000026
R13: 0000000000000002 R14: 00007f9ec78ddcc0 R15: 0000000000000002
 </TASK>
rcu: rcu_preempt kthread starved for 10458 jiffies! g18789 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27688 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17e7/0x5630 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7326
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 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:
CPU: 0 UID: 0 PID: 5270 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0x11eb/0x15f0 kernel/smp.c:912
Code: 1e 89 de 83 e6 01 31 ff e8 b2 f7 0b 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 5e f3 0b 00 eb 37 f3 90 41 0f b6 04 1c <84> c0 75 10 41 f7 06 01 00 00 00 74 1e e8 43 f3 0b 00 eb e5 44 89
RSP: 0018:ffffc900035b7820 EFLAGS: 00000293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888027755d00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900035b7970 R08: ffffffff90372437 R09: 1ffffffff206e486
R10: dffffc0000000000 R11: fffffbfff206e487 R12: 1ffff110170e81a9
R13: ffff8880b863c308 R14: ffff8880b8740d48 R15: 0000000000000001
FS:  00007f0f205a9780(0000) GS:ffff888125177000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe8dbeed7f CR3: 0000000074fa4000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1077
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x5c4/0x1090 arch/x86/mm/tlb.c:1451
 flush_tlb_page arch/x86/include/asm/tlbflush.h:345 [inline]
 ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:104
 wp_page_copy mm/memory.c:3941 [inline]
 do_wp_page+0x1a22/0x4a30 mm/memory.c:4336
 handle_pte_fault mm/memory.c:6395 [inline]
 __handle_mm_fault mm/memory.c:6517 [inline]
 handle_mm_fault+0x1490/0x3070 mm/memory.c:6686
 do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f0f20587312
Code: 55 53 48 81 ec 38 21 00 00 64 48 8b 04 25 28 00 00 00 48 89 84 24 28 21 00 00 31 c0 48 85 ff 0f 84 59 02 00 00 48 8d 44 24 40 <c6> 44 24 2f 00 49 89 fc 4c 8d ac 24 00 01 00 00 48 89 44 24 10 48
RSP: 002b:00007ffe8dbeed50 EFLAGS: 00010202
RAX: 00007ffe8dbeed90 RBX: 00005615eb895420 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00005615eb89f870
RBP: 00007ffe8dbf11d0 R08: 0000000000000008 R09: 0000000000000000
R10: 00007ffe8dbf11d0 R11: 0000000000000202 R12: 00005615d0e945e0
R13: 00005615eb88fd40 R14: 00007ffe8dbf0f90 R15: 00007ffe8dbf0f80
 </TASK>