rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=3f9c/1/0x4000000000000000 softirq=19356/19360 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=18425, q=468 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5980 Comm: syz-executor203 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:check_preemption_disabled+0x1/0xe0 lib/smp_processor_id.c:13
Code: 20 1c 2c 8c 48 c7 c6 60 1c 2c 8c eb 1c 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 <41> 57 41 56 53 65 8b 05 f7 5d 96 07 65 8b 0d ec 5d 96 07 f7 c1 ff
RSP: 0018:ffffc90000a08d48 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000080010002
RDX: ffff88801df18000 RSI: ffffffff8e2bd927 RDI: ffffffff8c2c1c80
RBP: 00000000ffffffff R08: ffffffff9a7daceb R09: 1ffffffff34fb59d
R10: dffffc0000000000 R11: fffffbfff34fb59e R12: 0000000000000046
R13: ffff88801df18000 R14: ffff8880b87281d8 R15: 0000000000000001
FS:  000055559537c400(0000) GS:ffff888125282000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76e9b9912d CR3: 000000007510c000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
 lock_is_held_type+0xdf/0x150 kernel/locking/lockdep.c:5941
 lock_is_held include/linux/lockdep.h:249 [inline]
 __remove_hrtimer+0x82/0x3e0 kernel/time/hrtimer.c:1145
 __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 dd 08 ec f5 f7 c3 00 02 00 00 74 05 e8 d0 68 17 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> 54 47 dd f5 65 8b 05 ed c4 93 07 85 c0 74 18 5b 41 5e e9 bc 25
RSP: 0018:ffffc900039dfc08 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000080000001
RDX: 0000000000000007 RSI: ffffffff8e03ecd2 RDI: 0000000000000001
RBP: ffffc900039dfd30 R08: ffffffff90370737 R09: 1ffffffff206e0e6
R10: dffffc0000000000 R11: fffffbfff206e0e7 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: 0033:0x7f76e9bbf5e1
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:00007ffdf8a1c698 EFLAGS: 00000293 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007ffdf8a1c6b0 RCX: 00007f76e9bbf5e1
RDX: 000000006a744bb8 RSI: 00007ffdf8a1c6b0 RDI: 0000000000000000
RBP: 00007ffdf8a1c6e0 R08: 00000000220c445d R09: 3fffffffffffffff
R10: 4000000000000000 R11: 0000000000000293 R12: 0000000000000026
R13: 0000000000000002 R14: 00007f76e9c47cc0 R15: 0000000000000002
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g18425 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:28176 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: 4978 Comm: udevd 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:ffffc90003d5f560 EFLAGS: 00000293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88807d74dd00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003d5f6a8 R08: ffffffff90370737 R09: 1ffffffff206e0e6
R10: dffffc0000000000 R11: fffffbfff206e0e7 R12: 1ffff110170e81a9
R13: ffff8880b863c308 R14: ffff8880b8740d48 R15: 0000000000000001
FS:  00007f4b64f48880(0000) GS:ffff888125182000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f34ad20da90 CR3: 000000007d84f000 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
 dup_mmap+0x1786/0x1d90 mm/mmap.c:1905
 dup_mm kernel/fork.c:1543 [inline]
 copy_mm+0x11a/0x480 kernel/fork.c:1595
 copy_process+0x1e3e/0x4390 kernel/fork.c:2289
 kernel_clone+0x2d7/0x940 kernel/fork.c:2748
 __do_sys_clone kernel/fork.c:2889 [inline]
 __se_sys_clone kernel/fork.c:2873 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2873
 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: 0033:0x7f4b648f1636
Code: 89 df e8 6d e8 f6 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffe3f038ea0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffe3f038ea8 RCX: 00007f4b648f1636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000562d958b42c0 R08: 0000000000000000 R09: 0000562d95aea020
R10: 00007f4b64f48b50 R11: 0000000000000246 R12: 00007ffe3f039260
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>