rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8813/1:b..l P30717/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=235549, q=291 ncpus=2)
task:udevd           state:R  running task     stack:25624 pid:30717 tgid:30717 ppid:5058   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 preempt_schedule_common+0x82/0xd0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock_irqrestore+0x74/0x80
 folios_put_refs+0x91b/0xb80
 shmem_undo_range+0x52c/0x1660
 shmem_evict_inode+0x289/0xae0
 evict+0x61e/0xb10
 __dentry_kill+0x1a2/0x690
 finish_dput+0xc9/0x480
 __fput+0x691/0xa60
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1a0bb7e0a8
RSP: 002b:00007ffdcad396e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f1a0baa7ae0 RCX: 00007f1a0bb7e0a8
RDX: 0000555a54d860cd RSI: 00007ffdcad38ee8 RDI: 0000000000000008
RBP: 0000555f01280780 R08: 0000000000000006 R09: d9c13c04b2fbb012
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000002
R13: 0000555f01271aa0 R14: 0000000000000008 R15: 0000555f01260910
 </TASK>
task:syz.2.591       state:R  running task     stack:24152 pid:8813  tgid:8812  ppid:5620   task_flags:0x400140 flags:0x00080003
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x730
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x221/0x350
Code: ff ff ff e8 e1 54 06 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 cb 2f 97 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 98 5c 92
RSP: 0000:ffffc900082bfa28 EFLAGS: 00000286
RAX: 52325ed310ac1700 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000005a44979c RSI: ffffffff8e21bb2d RDI: ffffffff8c28b160
RBP: ffffffff84a95b05 R08: ffffffff84a95b05 R09: ffffffff8e95cda0
R10: dffffc0000000000 R11: fffff52001057f45 R12: 0000000000000002
R13: ffffffff8e95cda0 R14: 0000000000000000 R15: 0000000000000246
 io_should_wake+0x61/0x3b0
 io_cqring_wait+0x10a0/0x2020
 __se_sys_io_uring_enter+0x58c/0x1c40
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f09f779cdd9
RSP: 002b:00007f09f85fd028 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007f09f7a15fa0 RCX: 00007f09f779cdd9
RDX: 00000000ffffffdc RSI: 000000000000012a RDI: 0000000000000000
RBP: 00007f09f7832d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000017 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f09f7a16038 R14: 00007f09f7a15fa0 R15: 00007fff55a844d8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g235549 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=82476
rcu: rcu_preempt kthread starved for 10502 jiffies! g235549 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:27544 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31157 Comm: syz.6.6231 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:kasan_check_range+0x1c7/0x2c0
Code: f4 49 01 dc 4d 01 f3 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 0e 41 80 3b 00 75 7c 49 ff c3 49 ff cc 75 f2 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 45 84 ff 0f 85 a1
RSP: 0018:ffffc90000007d50 EFLAGS: 00000056
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81a2447d
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff9a6e1780
RBP: ffff8881141a0300 R08: ffffffff9a6e1783 R09: 1ffffffff34dc2f0
R10: dffffc0000000000 R11: fffffbfff34dc2f1 R12: 0000000000000001
R13: ffff888121028410 R14: fffffbfff34dc2f1 R15: 1ffffffff34dc2f0
FS:  0000200000001500(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3391cff8 CR3: 00000001176c2000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 do_raw_spin_unlock+0x4d/0x210
 _raw_spin_unlock_irqrestore+0x23/0x80
 __hrtimer_run_queues+0x23a/0xa20
 hrtimer_interrupt+0x44b/0x950
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x427/0xbe0
Code: 41 c7 84 24 e0 0d 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 06 bd 15 0a e8 d1 eb 38 00 fb 49 8d bd a8 16 00 00 <48> 89 f8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 7b 03 00 00 41 80
RSP: 0018:ffffc90008b75a70 EFLAGS: 00000206
RAX: 0000000000008517 RBX: 1ffff11024207784 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dfa8352 RDI: ffff888109bcef28
RBP: ffffc90008b75ad0 R08: ffffffff9030a6f7 R09: 1ffffffff20614de
R10: dffffc0000000000 R11: fffffbfff20614df R12: ffff88812103ae88
R13: ffff888109bcd880 R14: ffff88816cd98000 R15: dffffc0000000000
 __schedule+0x17bc/0x5680
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x730
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:lock_acquire+0x221/0x350
Code: ff ff ff e8 e1 54 06 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 cb 2f 97 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 98 5c 92
RSP: 0018:ffffc90008b75e38 EFLAGS: 00000282
RAX: b0582d72f713dc00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000cec1448a RSI: ffffffff8e21bb2d RDI: ffffffff8c28b160
RBP: ffffffff8176e256 R08: ffffffff8176e256 R09: ffffffff8e95cda0
R10: ffffc90008b75f98 R11: ffffffff81b0d910 R12: 0000000000000002
R13: ffffffff8e95cda0 R14: 0000000000000000 R15: 0000000000000246
 unwind_next_frame+0xc3/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 save_stack+0x122/0x230
 __set_page_owner+0x8d/0x4c0
 post_alloc_hook+0x1f9/0x250
 get_page_from_freelist+0x24ba/0x2540
 __alloc_frozen_pages_noprof+0x18d/0x380
 alloc_pages_mpol+0x235/0x490
 folio_alloc_mpol_noprof+0x39/0x160
 shmem_alloc_and_add_folio+0x442/0xf80
 shmem_get_folio_gfp+0x5a9/0x1670
 shmem_write_begin+0x16c/0x330
 generic_perform_write+0x2e2/0x8f0
 shmem_file_write_iter+0xf8/0x120
 __kernel_write_iter+0x41e/0x880
 dump_user_range+0xc19/0x12c0
 elf_core_dump+0x34c2/0x3ad0
 coredump_write+0x1216/0x1910
 vfs_coredump+0x3807/0x4530
 get_signal+0x1107/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 irqentry_exit+0x284/0x730
 exc_general_protection+0x16b/0x1f0
 asm_exc_general_protection+0x26/0x30
RIP: 0033:0x7f2b6ed9cde1
Code: 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 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:00002000000002b0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f2b6f015fa0 RCX: 00007f2b6ed9cdd9
RDX: 00002000000002c0 RSI: 00002000000002b0 RDI: 00000000000c0000
RBP: 00007f2b6ee32d69 R08: 0000200000001500 R09: 0000200000001500
R10: 0000200000000300 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f2b6f016038 R14: 00007f2b6f015fa0 R15: 00007ffce2d01708
 </TASK>
