rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=8c2c/1/0x4000000000000000 softirq=102547/102547 fqs=53
rcu: 	(detected by 0, t=10502 jiffies, g=116581, q=1174 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 15381 Comm: syz.0.1844 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x5e/0xb0 kernel/rcu/tree.c:753
Code: 03 42 80 3c 38 00 74 08 4c 89 f7 e8 fc 27 8a 00 48 c7 c3 98 7b 72 93 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 34 <8b> 03 65 ff 0d 49 1f c5 11 74 11 83 e0 04 c1 e8 02 5b 41 5e 41 5f
RSP: 0018:ffffc90000a18db8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880b8733b98 RCX: 0000000080010002
RDX: ffff888079f28000 RSI: ffffffff8c4c7660 RDI: ffffffff8c4c7620
RBP: ffff88807d44a300 R08: ffffffff9058fb7f R09: 1ffffffff20b1f6f
R10: dffffc0000000000 R11: fffffbfff20b1f70 R12: 0000000000000001
R13: 0000000000000001 R14: ffffffff8e5237d8 R15: dffffc0000000000
FS:  00007f611d4a06c0(0000) GS:ffff88812500c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fa23ffc CR3: 000000007903a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000202 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 trace_hrtimer_expire_exit include/trace/events/timer.h:321 [inline]
 __run_hrtimer kernel/time/hrtimer.c:2069 [inline]
 __hrtimer_run_queues+0x440/0xa10 kernel/time/hrtimer.c:2123
 hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2242
 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 3d a8 c5 f5 f7 c3 00 02 00 00 74 05 e8 c0 cf f1 f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 04 ce b6 f5 65 8b 05 0d 52 93 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc90004b77d28 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000202 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8e253559 RDI: 0000000000000001
RBP: ffffc90004b77e30 R08: ffffffff9058fb7f R09: 1ffffffff20b1f6f
R10: dffffc0000000000 R11: fffffbfff20b1f70 R12: 1ffff9200096efb0
R13: 0000000000000000 R14: ffffffff9a7eca38 R15: 000000000cbc8422
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:573 [inline]
 do_settimeofday64+0x344/0x590 kernel/time/timekeeping.c:1706
 __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:61 [inline]
 do_syscall_64+0x166/0x510 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f611c59e0d9
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:00007f611d4a0028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f611c825fa0 RCX: 00007f611c59e0d9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007f611c635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f611c826038 R14: 00007f611c825fa0 R15: 00007ffd82b261b8
 </TASK>
rcu: rcu_preempt kthread starved for 10392 jiffies! g116581 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1b2a/0x59a0 kernel/sched/core.c:7232
 __schedule_loop kernel/sched/core.c:7309 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7324
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
 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: 15344 Comm: udevd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:csd_lock_wait kernel/smp.c:363 [inline]
RIP: 0010:csd_lock kernel/smp.c:396 [inline]
RIP: 0010:smp_call_function_many_cond+0x61c/0x1500 kernel/smp.c:944
Code: b6 04 04 84 c0 0f 85 d5 03 00 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 a3 50 0c 00 41 83 e7 01 75 07 e8 58 4c 0c 00 eb 3f f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 0f f7 03 01
RSP: 0000:ffffc90004ba7720 EFLAGS: 00000293
RAX: ffffffff81bb38cc RBX: ffff8880b8741a48 RCX: ffff88802b23be80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90004ba7870 R08: ffff88802b23d41f R09: 1ffff11005647a83
R10: dffffc0000000000 R11: ffffffff8179b770 R12: 1ffff110170e8349
R13: 0000000000000001 R14: ffff8880b8741a40 R15: 0000000000000001
FS:  00007f5096667880(0000) GS:ffff888124f0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005627b24d22c0 CR3: 0000000058ad0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __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+0x8fd/0x1090 arch/x86/mm/tlb.c:1435
 flush_tlb_page arch/x86/include/asm/tlbflush.h:352 [inline]
 ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:104
 wp_page_copy mm/memory.c:4073 [inline]
 do_wp_page+0x3c5c/0x4b80 mm/memory.c:4472
 handle_pte_fault mm/memory.c:6583 [inline]
 __handle_mm_fault mm/memory.c:6708 [inline]
 handle_mm_fault+0x15d7/0x3750 mm/memory.c:6877
 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: 0033:0x7f5095eb5b3b
Code: 04 07 0f 85 a9 00 00 00 f3 0f 6f 47 10 48 8b 57 18 66 48 0f 7e c0 48 3b 78 18 75 7b 48 3b 7a 10 75 75 48 8b 77 10 48 89 50 18 <66> 0f d6 42 10 48 81 f9 ff 03 00 00 76 28 48 8b 57 20 48 85 d2 74
RSP: 002b:00007ffc175f3bf0 EFLAGS: 00010246
RAX: 00007f5095ff1bd0 RBX: 0000000000000040 RCX: 00000000000000c1
RDX: 00005627b24d22b0 RSI: 00007f5095ff1bd0 RDI: 00005627b23a1d40
RBP: 00007f5095ff1ac0 R08: 00007f5095ff1ac0 R09: 0000000000000040
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000030
R13: 00005627b23a1d40 R14: 00000000000000c0 R15: 00007f5095ff1b20
 </TASK>