rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6091/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=12717, q=888 ncpus=2)
task:udevd           state:R  running task     stack:22712 pid:6091  tgid:6091  ppid:5197   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6863
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:read_word_at_a_time+0x16/0x20 include/asm-generic/rwonce.h:94
Code: ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 53 48 89 fb e8 57 f0 80 ff 48 89 df be 01 00 00 00 e8 ca 4a e7 ff <48> 8b 03 5b e9 11 78 1d 09 cc 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000b2d7888 EFLAGS: 00000256
RAX: ffffffff8240c301 RBX: ffff88802f4a24e0 RCX: ffffffff8240c346
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88802f4a24e0
RBP: 0000000000000002 R08: ffff88802f4a24e0 R09: 1ffff11005e9449c
R10: dffffc0000000000 R11: ffffed1005e9449d R12: ffff88807cf11132
R13: ffff88802f4a24e0 R14: 736b7369642d7962 R15: 0000000000000002
 dentry_string_cmp fs/dcache.c:270 [inline]
 dentry_cmp fs/dcache.c:322 [inline]
 __d_lookup_rcu+0x247/0x4c0 fs/dcache.c:2347
 lookup_fast+0xdb/0x5b0 fs/namei.c:1792
 walk_component fs/namei.c:2217 [inline]
 link_path_walk+0x720/0x18d0 fs/namei.c:2589
 path_lookupat+0xe4/0x8c0 fs/namei.c:2745
 filename_lookup+0x212/0x570 fs/namei.c:2775
 user_path_at+0x3a/0x60 fs/namei.c:3567
 do_utimes_path fs/utimes.c:96 [inline]
 do_utimes+0x131/0x2a0 fs/utimes.c:141
 __do_sys_utimensat fs/utimes.c:160 [inline]
 __se_sys_utimensat fs/utimes.c:144 [inline]
 __x64_sys_utimensat+0x14f/0x230 fs/utimes.c:144
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f45f8e34a1a
RSP: 002b:00007ffd81c59668 EFLAGS: 00000246 ORIG_RAX: 0000000000000118
RAX: ffffffffffffffda RBX: 00005595755dcb50 RCX: 00007f45f8e34a1a
RDX: 0000000000000000 RSI: 00005595755dcb50 RDI: 00000000ffffff9c
RBP: 00005595755dcb69 R08: 0000000000008080 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 00007ffd81c59b20
R13: 00007ffd81c59720 R14: 000055953970c6d7 R15: 00007ffd81c5a7b0
 </TASK>
rcu: rcu_preempt kthread starved for 10417 jiffies! g12717 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27136 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6863
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__try_to_del_timer_sync+0x0/0x390 kernel/time/timer.c:1452
Code: 89 fb e8 63 3e 13 00 48 89 df 31 f6 5b eb 1b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 41 57 41 56 41 55 41 54 53 48 83 ec 10 89 74 24 0c 48 89 fb e8
RSP: 0018:ffffc90000157938 EFLAGS: 00000293
RAX: ffffffff81ae7b0d RBX: dffffc0000000000 RCX: ffff88801ceb5b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90000157a40
RBP: ffffc90000157a10 R08: ffffffff8f820377 R09: 1ffffffff1f0406e
R10: dffffc0000000000 R11: fffffbfff1f0406f R12: ffffc90000157a40
R13: 1ffff9200002af2c R14: 0000000000000000 R15: 0000000000000000
 __timer_delete_sync+0x1fe/0x2d0 kernel/time/timer.c:1621
 schedule_timeout+0x133/0x270 kernel/time/sleep_timeout.c:100
 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+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: 13 ee 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 73 00 0d 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6
RAX: 59576511215d7b00 RBX: ffffffff8197919a RCX: 59576511215d7b00
RDX: 0000000000000001 RSI: ffffffff8d791132 RDI: ffffffff8bc07ae0
RBP: ffffc90000197f10 R08: ffff8880b87336db R09: 1ffff110170e66db
R10: dffffc0000000000 R11: ffffed10170e66dc R12: ffffffff8f820370
R13: 1ffff110039dcb70 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125f37000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efea3d60ad7 CR3: 000000003477e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1ea/0x520 kernel/sched/idle.c:332
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x147
 </TASK>