rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=dd7c/1/0x4000000000000000 softirq=15918/15919 fqs=1
rcu: 	(detected by 0, t=10502 jiffies, g=11653, q=327 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6061 Comm: syz-executor.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:mark_lock+0x17/0xa20 kernel/locking/lockdep.c:4714
Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 41 55 49 89 fd 41 54 49 89 f4 53 48 83 e4 f0 <48> 83 ec 70 65 48 8b 1d d5 54 28 12 48 89 5c 24 68 89 d3 83 fa 08
RSP: 0018:ffffc90000a08b80 EFLAGS: 00000082
RAX: 0000000000000001 RBX: ffff888034225468 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffff888034225468 RDI: ffff888034224900
RBP: ffffc90000a08bb0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000001 R12: ffff888034225468
R13: ffff888034224900 R14: 0000000000000002 R15: 0000000000000002
FS:  00007f97d5e0e6c0(0000) GS:ffff888124452000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000600 CR3: 000000007cfef000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 mark_usage kernel/locking/lockdep.c:4639 [inline]
 __lock_acquire+0x10ff/0x2630 kernel/locking/lockdep.c:5191
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 debug_object_activate+0x144/0x490 lib/debugobjects.c:818
 debug_hrtimer_activate kernel/time/hrtimer.c:446 [inline]
 debug_activate kernel/time/hrtimer.c:485 [inline]
 enqueue_hrtimer+0x25/0x3e0 kernel/time/hrtimer.c:1089
 __run_hrtimer kernel/time/hrtimer.c:1802 [inline]
 __hrtimer_run_queues+0x863/0xa70 kernel/time/hrtimer.c:1849
 hrtimer_interrupt+0x397/0x8c0 kernel/time/hrtimer.c:1911
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x490 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1056
 </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:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 d6 a1 53 f6 48 89 df e8 be f1 53 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 55 28 44 f6 65 8b 05 9e be 7b 08 85 c0 74 16 5b
RSP: 0018:ffffc90004a77b58 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff8880b84284c0 RCX: 0000000000000080
RDX: 0000000000000000 RSI: ffffffff8de6ce9d RDI: ffffffff8c1adfa0
RBP: 0000000000000287 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 1894b2f7a485799a R15: ffff8880b84284c0
 clock_was_set+0x5ed/0x840 kernel/time/hrtimer.c:973
 do_adjtimex+0x302/0x370 kernel/time/timekeeping.c:2767
 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+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f97d506d079
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:00007f97d5e0e0b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f97d51abf80 RCX: 00007f97d506d079
RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000000
RBP: 00007f97d50ce498 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f97d51abf80 R15: 00007fff392cc178
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g11653 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:28904 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0xfee/0x60e0 kernel/sched/core.c:6907
 __schedule_loop kernel/sched/core.c:6989 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7004
 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:467
 ret_from_fork+0x754/0xd80 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: 6006 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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 a2 e8 eb 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 65 47 04 12 48 8b 34 24 <65> 48 8b 15 41 47 04 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00
RSP: 0000:ffffc90004967890 EFLAGS: 00000202
RAX: 0000000000000003 RBX: 0000000000000001 RCX: ffffffff81fc3e12
RDX: 0000000000000001 RSI: ffffffff81fc3dec RDI: ffff88802fd8c900
RBP: ffff8880b8540d20 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed10170a81a5 R14: 0000000000000001 R15: ffff8880b843c3c0
FS:  00007f1bc8a04880(0000) GS:ffff888124352000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1bc83f85e0 CR3: 000000006d88b000 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+0x57c/0x1500 kernel/smp.c:877
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1043
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:57 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline]
 flush_tlb_mm_range+0x45f/0x1710 arch/x86/mm/tlb.c:1472
 flush_tlb_page arch/x86/include/asm/tlbflush.h:323 [inline]
 ptep_clear_flush+0x148/0x170 mm/pgtable-generic.c:103
 wp_page_copy mm/memory.c:3838 [inline]
 do_wp_page+0x1499/0x4f00 mm/memory.c:4233
 handle_pte_fault mm/memory.c:6324 [inline]
 __handle_mm_fault+0x1ac8/0x2b60 mm/memory.c:6446
 handle_mm_fault+0x36d/0xa20 mm/memory.c:6615
 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: 0033:0x7f1bc82f77c8
Code: 66 90 48 8b 05 79 96 0f 00 53 48 8b 1d 19 97 0f 00 66 0f 6e 08 8b 44 24 10 66 0f 6e 03 50 48 8d 05 1d 0e 10 00 50 66 0f 62 c1 <66> 0f d6 05 10 0e 10 00 e8 db f9 ff ff 8b 15 05 0e 10 00 48 8b 0d
RSP: 002b:00007ffc34be8460 EFLAGS: 00010246
RAX: 00007f1bc83f85e0 RBX: 00007f1bc83f1248 RCX: 0000558aea668660
RDX: 0000558aea65795f RSI: 00007ffc34be85d0 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffc34be89d5 R11: 0000000000000000 R12: 0000558aea65795f
R13: 0000558aea668660 R14: 0000000000000000 R15: 0000558aea65dbcc
 </TASK>