rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=da44/1/0x4000000000000000 softirq=14647/14647 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=11469, q=432 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6059 Comm: rm Not tainted 6.14.0-rc6-syzkaller-00016-g0fed89a961ea #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:validate_chain+0x52/0x5920 kernel/locking/lockdep.c:3862
Code: 00 00 00 65 48 8b 04 25 28 00 00 00 48 89 84 24 a0 02 00 00 49 bc 00 00 00 00 00 fc ff df 48 c7 84 24 00 01 00 00 b3 8a b5 41 <48> c7 84 24 08 01 00 00 6e b8 2a 8e 48 c7 84 24 10 01 00 00 00 8c
RSP: 0018:ffffc90000007740 EFLAGS: 00000082
RAX: 5aeda65a52553d00 RBX: ffffffff93e94ba0 RCX: d57e1d102ea6ccdd
RDX: 0000000000000001 RSI: ffff88802f0b8b18 RDI: ffff88802f0b8000
RBP: ffffc90000007a40 R08: ffffffff9451784f R09: 1ffffffff28a2f09
R10: dffffc0000000000 R11: fffffbfff28a2f0a R12: dffffc0000000000
R13: ffff88802f0b8000 R14: d57e1d102ea6ccdd R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5e5dda6d58 CR3: 0000000027130000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0xd3/0x120 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1805 [inline]
 __hrtimer_run_queues+0x670/0xd30 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 0e 98 22 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 63 7d 8b f5 65 8b 05 94 cf ff 73 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc90002f8f640 EFLAGS: 00000206
RAX: 5aeda65a52553d00 RBX: 1ffff920005f1ecc RCX: ffffffff819d4afa
RDX: dffffc0000000000 RSI: ffffffff8c2ab3a0 RDI: 0000000000000001
RBP: ffffc90002f8f6d0 R08: ffffffff94517877 R09: 1ffffffff28a2f0e
R10: dffffc0000000000 R11: fffffbfff28a2f0f R12: dffffc0000000000
R13: 1ffff920005f1ec8 R14: ffffc90002f8f660 R15: 0000000000000246
 debug_object_activate+0x3f7/0x580 lib/debugobjects.c:836
 debug_rcu_head_queue kernel/rcu/rcu.h:224 [inline]
 __call_rcu_common kernel/rcu/tree.c:3050 [inline]
 call_rcu+0x97/0xac0 kernel/rcu/tree.c:3172
 tlb_remove_table_free mm/mmu_gather.c:287 [inline]
 tlb_table_flush+0x365/0x410 mm/mmu_gather.c:349
 tlb_flush_mmu_free mm/mmu_gather.c:387 [inline]
 tlb_flush_mmu+0x2f8/0x680 mm/mmu_gather.c:396
 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:488
 exit_mmap+0x52a/0xd40 mm/mmap.c:1297
 __mmput+0x115/0x410 kernel/fork.c:1356
 exit_mm+0x220/0x310 kernel/exit.c:570
 do_exit+0x9ad/0x28e0 kernel/exit.c:925
 do_group_exit+0x207/0x2c0 kernel/exit.c:1087
 __do_sys_exit_group kernel/exit.c:1098 [inline]
 __se_sys_exit_group kernel/exit.c:1096 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096
 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4688357a90
Code: Unable to access opcode bytes at 0x7f4688357a66.
RSP: 002b:00007ffecf7bb998 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f4688448860 RCX: 00007f4688357a90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00007f4688448860 R08: 00007ffecf7bb810 R09: 00007ffecf7bb8f0
R10: 00007ffecf7bb850 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f468844c658 R15: 0000000000000001
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g11469 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=5418
rcu: rcu_preempt kthread starved for 10502 jiffies! g11469 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:25624 pid:18    tgid:18    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x18bc/0x4c40 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6857
 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>