rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (3 ticks this GP) idle=b154/1/0x4000000000000000 softirq=16356/16356 fqs=0
rcu: 	(detected by 0, t=10503 jiffies, g=13341, q=522 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5985 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:mark_usage kernel/locking/lockdep.c:4639 [inline]
RIP: 0010:__lock_acquire+0x65e/0xd20 kernel/locking/lockdep.c:5191
Code: 00 74 55 48 8b 3c 24 4c 89 f6 ba 05 00 00 00 eb 36 85 c9 74 1d 45 31 ff 48 8b 3c 24 4c 89 f6 31 d2 e8 d6 25 00 00 48 8b 3c 24 <85> c0 0f 84 42 06 00 00 83 bf 14 0b 00 00 00 74 1d 48 8b 3c 24 4c
RSP: 0018:ffffc90000a08ad0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffffffff936b0330
RDX: 0000000000000000 RSI: ffff88802c83c8f0 RDI: ffff88802c83bc80
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff84d7445a
R10: ffffc90000a08cb0 R11: fffff52000141198 R12: 0000000000000002
R13: 0000000000000002 R14: ffff88802c83c8f0 R15: 0000000000000000
FS:  000055555ba5b500(0000) GS:ffff888125afc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f92a4d156c0 CR3: 00000000717a4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x9a/0x250 lib/debugobjects.c:873
 debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline]
 debug_deactivate+0x1d/0x200 kernel/time/hrtimer.c:483
 __run_hrtimer kernel/time/hrtimer.c:1745 [inline]
 __hrtimer_run_queues+0x2b0/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x0/0x90 kernel/kcov.c:320
Code: 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 cc cc cc cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 40 c2 92 65 8b 15 18 e0
RSP: 0018:ffffc900041df398 EFLAGS: 00000246
RAX: ffffffff820ddf93 RBX: 0000000000000020 RCX: ffff88802c83bc80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900041df630 R08: ffffea0001b44b87 R09: 1ffffd4000368970
R10: dffffc0000000000 R11: fffff94000368971 R12: 0000000000000010
R13: ffff88807e68e660 R14: 840000006d12e805 R15: 1ffff1100fcd1ccc
 pte_write arch/x86/include/asm/pgtable.h:218 [inline]
 __copy_present_ptes mm/memory.c:1087 [inline]
 copy_present_ptes mm/memory.c:1179 [inline]
 copy_pte_range mm/memory.c:1302 [inline]
 copy_pmd_range+0x2187/0x7f00 mm/memory.c:1389
 copy_pud_range mm/memory.c:1426 [inline]
 copy_p4d_range mm/memory.c:1450 [inline]
 copy_page_range+0xc14/0x1270 mm/memory.c:1538
 dup_mmap+0xf4c/0x1b10 mm/mmap.c:1834
 dup_mm kernel/fork.c:1489 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1541
 copy_process+0x1706/0x3c20 kernel/fork.c:2226
 kernel_clone+0x21e/0x840 kernel/fork.c:2657
 __do_sys_clone kernel/fork.c:2798 [inline]
 __se_sys_clone kernel/fork.c:2782 [inline]
 __x64_sys_clone+0x185/0x1e0 kernel/fork.c:2782
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f92a3f85613
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 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 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffd0762bc48 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f92a3f85613
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055555ba5b7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 00000000000220b9 R15: 00007ffd0762bde0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g13341 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=7378
rcu: rcu_preempt kthread starved for 10503 jiffies! g13341 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27224 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>