rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=842c/1/0x4000000000000000 softirq=7485/7485 fqs=6
rcu: 	(detected by 0, t=10502 jiffies, g=8857, q=176 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5139 Comm: udevd Not tainted 6.7.0-syzkaller-11705-gb0d326da462e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:hlock_class+0x2d/0x130 kernel/locking/lockdep.c:223
Code: 00 00 00 00 fc ff df 53 48 89 fb 48 83 c7 20 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e d2 00 00 00 0f b7 5b 20 <66> 81 e3 ff 1f 0f b7 db be 08 00 00 00 48 89 d8 48 c1 e8 06 48 8d
RSP: 0018:ffffc900001f0a90 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000004067 RCX: 0000000000000000
RDX: 1ffff11005f22519 RSI: ffff88802f9128a8 RDI: ffff88802f9128c8
RBP: ffffc900001f0be0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9214bf4f R11: 0000000000000001 R12: ffff88802f911dc0
R13: 0000000000000001 R14: 0000000000000000 R15: 1ffff9200003e15a
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563e7cd24040 CR3: 000000002af28000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 mark_lock+0xb5/0xc50 kernel/locking/lockdep.c:4656
 mark_usage kernel/locking/lockdep.c:4564 [inline]
 __lock_acquire+0x137a/0x3b30 kernel/locking/lockdep.c:5091
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1692 [inline]
 __hrtimer_run_queues+0x2bd/0xc20 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
 __sysvec_apic_timer_interrupt+0x105/0x400 arch/x86/kernel/apic/apic.c:1082
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x70 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 16 1b d9 f6 48 89 df e8 0e 93 d9 f6 f7 c5 00 02 00 00 75 1f 9c 58 f6 c4 02 75 2f <bf> 01 00 00 00 e8 05 33 cb f6 65 8b 05 d6 67 74 75 85 c0 74 12 5b
RSP: 0018:ffffc9000471f998 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff92bf0440 RCX: 1ffffffff242c2c1
RDX: 0000000000000000 RSI: ffffffff8accae00 RDI: ffffffff8b2f8f80
RBP: 0000000000000286 R08: 0000000000000001 R09: fffffbfff24297ee
R10: ffffffff9214bf77 R11: 0000000000000001 R12: ffff88802023a460
R13: 0000000000000002 R14: 0000000000000002 R15: ffff88802023a460
 __debug_check_no_obj_freed lib/debugobjects.c:998 [inline]
 debug_check_no_obj_freed+0x324/0x600 lib/debugobjects.c:1019
 slab_free_hook mm/slub.c:2093 [inline]
 slab_free mm/slub.c:4299 [inline]
 kmem_cache_free+0x255/0x350 mm/slub.c:4363
 anon_vma_chain_free mm/rmap.c:147 [inline]
 unlink_anon_vmas+0x455/0x800 mm/rmap.c:448
 free_pgtables+0x31b/0x860 mm/memory.c:402
 exit_mmap+0x3d2/0xb50 mm/mmap.c:3288
 __mmput+0x12a/0x4d0 kernel/fork.c:1343
 mmput+0x62/0x70 kernel/fork.c:1365
 exit_mm kernel/exit.c:569 [inline]
 do_exit+0x9a5/0x2ad0 kernel/exit.c:858
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020
 __do_sys_exit_group kernel/exit.c:1031 [inline]
 __se_sys_exit_group kernel/exit.c:1029 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1029
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f0e324fca90
Code: Unable to access opcode bytes at 0x7f0e324fca66.
RSP: 002b:00007ffc0c532278 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0e324fca90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000007 R09: d49774c839bedaaf
R10: 0000000000000060 R11: 0000000000000206 R12: 0000563e7cd28f80
R13: 00007ffc0c5322b8 R14: 0000000000000001 R15: 0000563e7cd17910
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 7600 jiffies! g8857 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=5894
rcu: rcu_preempt kthread starved for 7601 jiffies! g8857 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:26800 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0xf12/0x5c00 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6817
 schedule_timeout+0x137/0x290 kernel/time/timer.c:2183
 rcu_gp_fqs_loop+0x1ec/0xb10 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0x24b/0x380 kernel/rcu/tree.c:1830
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>