rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=008c/1/0x4000000000000000 softirq=15442/15443 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=12977, q=335 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5904 Comm: syz-executor.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:100 [inline]
RIP: 0010:do_raw_spin_unlock+0x24/0x1e0 kernel/locking/spinlock_debug.c:141
Code: 90 90 90 90 90 90 0f 1f 40 d6 48 b8 00 00 00 00 00 fc ff df 41 54 55 53 48 89 fb 48 83 c7 04 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 82 01 00 00 81
RSP: 0018:ffffc90000007d28 EFLAGS: 00000803
RAX: dffffc0000000000 RBX: ffffffff9b438880 RCX: ffffc90000007d0c
RDX: 0000000000000000 RSI: ffffffff8def8e2a RDI: ffffffff9b438884
RBP: 0000000000000002 R08: 0000000000000001 R09: fffff52000000f9a
R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000002
R13: ffff8880370b7300 R14: dffffc0000000000 R15: 1ffff92000000fb0
FS:  00007f9373bfe6c0(0000) GS:ffff888124379000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000600 CR3: 000000002bd5c000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:177 [inline]
 _raw_spin_unlock_irqrestore+0x22/0x80 kernel/locking/spinlock.c:198
 debug_object_activate+0x331/0x490 lib/debugobjects.c:853
 debug_hrtimer_activate kernel/time/hrtimer.c:485 [inline]
 debug_activate kernel/time/hrtimer.c:528 [inline]
 enqueue_hrtimer+0x75/0x2f0 kernel/time/hrtimer.c:1109
 __run_hrtimer kernel/time/hrtimer.c:1946 [inline]
 __hrtimer_run_queues+0x73d/0xa00 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 66 e6 57 f6 48 89 df e8 3e 36 58 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 a5 09 48 f6 65 8b 05 fe de 7d 08 85 c0 74 16 5b
RSP: 0018:ffffc900047d7b48 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff8880b84284c0 RCX: 0000000000000080
RDX: 0000000000000000 RSI: ffffffff8df1e362 RDI: ffffffff8c1c3200
RBP: 0000000000000287 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: fffffbfff21af0ea
R13: dffffc0000000000 R14: ffff88de7841db89 R15: 0000000000000002
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:571 [inline]
 clock_was_set+0x5d9/0x870 kernel/time/hrtimer.c:994
 do_adjtimex+0x302/0x370 kernel/time/timekeeping.c:2924
 do_clock_adjtime kernel/time/posix-timers.c:1154 [inline]
 __do_sys_clock_adjtime+0x177/0x290 kernel/time/posix-timers.c:1166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f937486d079
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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9373bfe078 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f93749abf80 RCX: 00007f937486d079
RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000000
RBP: 00007f93748ce498 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f93749abf80 R15: 00007ffd0d285ea8
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g12977 f0x0 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:28600 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5387 [inline]
 __schedule+0x10e9/0x6820 kernel/sched/core.c:7188
 __schedule_loop kernel/sched/core.c:7267 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7282
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
 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:
CPU: 1 UID: 0 PID: 5802 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:get_current arch/x86/include/asm/current.h:23 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xf/0x70 kernel/kcov.c:216
Code: 00 00 00 5b e9 42 b4 f0 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 05 e1 01 12 48 8b 34 24 <65> 48 8b 15 e1 e0 01 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00
RSP: 0000:ffffc90003ee7880 EFLAGS: 00000202
RAX: 0000000000000003 RBX: 0000000000000000 RCX: ffffffff81fc0f3d
RDX: 0000000000000001 RSI: ffffffff81fc0f17 RDI: ffff88802f302500
RBP: ffff8880b8443320 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed1017088665 R14: 0000000000000001 R15: ffff8880b853c5c0
FS:  00007f5a2616d880(0000) GS:ffff888124479000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd13ccfca4 CR3: 000000002b032000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 native_pause arch/x86/include/asm/vdso/processor.h:13 [inline]
 cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
 csd_lock_wait kernel/smp.c:342 [inline]
 smp_call_function_many_cond+0x587/0x1700 kernel/smp.c:892
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1057
 __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+0x45f/0x16f0 arch/x86/mm/tlb.c:1451
 flush_tlb_page arch/x86/include/asm/tlbflush.h:345 [inline]
 ptep_clear_flush+0x148/0x170 mm/pgtable-generic.c:104
 wp_page_copy mm/memory.c:3925 [inline]
 do_wp_page+0x12a4/0x4350 mm/memory.c:4320
 handle_pte_fault mm/memory.c:6427 [inline]
 __handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6549
 handle_mm_fault+0x36d/0xa20 mm/memory.c:6718
 do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f5a25a7d748
Code: 66 90 41 57 49 89 f7 41 56 41 55 49 89 d5 41 54 55 53 48 89 fb 4c 89 ff 48 81 ec c8 04 00 00 48 8b 05 94 36 17 00 f3 0f 6f 0a <89> 4c 24 44 48 89 74 24 58 64 8b 00 be 25 00 00 00 0f 11 8c 24 b8
RSP: 002b:00007ffd13ccfc60 EFLAGS: 00010206
RAX: fffffffffffffe68 RBX: 00007ffd13cd0160 RCX: 0000000000000000
RDX: 00007ffd13cd0288 RSI: 0000564a3cc3bad6 RDI: 0000564a3cc3bad6
RBP: 0000564a486fc870 R08: 0000564a4869510e R09: 0000000000000000
R10: 0000000000000000 R11: 00007f5a25b988e0 R12: 00007ffd13cd0188
R13: 00007ffd13cd0288 R14: 3d5845444e494649 R15: 0000564a3cc3bad6
 </TASK>