rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=87925, q=339 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4295005154-4294994654), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10500 jiffies! g87925 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:26856 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>
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: 5235 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:246 [inline]
RIP: 0010:__lock_acquire+0xa51/0xd20 kernel/locking/lockdep.c:5234
Code: 90 0f 0b 90 90 90 31 c0 48 8b 3c 24 48 83 78 40 00 0f 84 8c 02 00 00 41 8b 46 20 25 ff 1f 00 00 48 0f a3 05 51 f9 2b 12 73 10 <48> 69 c0 c8 00 00 00 48 8d 80 30 03 6b 93 eb 40 83 3d b8 88 2f 18
RSP: 0018:ffffc90000007b40 EFLAGS: 00000003
RAX: 0000000000000007 RBX: 0000000000000001 RCX: 00000000fe09d4ff
RDX: 00000000105209fd RSI: 000000005a44979c RDI: ffff888044911e40
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff89a5d188
R10: dffffc0000000000 R11: ffffed1005093a5e R12: 0000000000004008
R13: ffff888044912970 R14: ffff888044912998 R15: 0ac0d5affe09d4ff
FS:  00007f09e9bc4880(0000) GS:ffff8881259fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb9f5cb6f98 CR3: 000000004449c000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 advance_sched+0xa14/0xc90 net/sched/sch_taprio.c:990
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x52c/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:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0x44/0x3e0 kernel/locking/lockdep.c:5879
Code: 8b 05 b0 32 24 11 48 89 44 24 28 0f 1f 44 00 00 65 8b 05 b3 32 24 11 83 f8 08 0f 83 9a 02 00 00 89 c0 48 0f a3 05 dc 49 25 0e <73> 16 e8 15 e9 08 00 84 c0 75 0d f6 05 63 2d 0f 0e 01 0f 84 ad 02
RSP: 0018:ffffc900030e77d8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff88801bae79b0 RCX: ffff888044911e40
RDX: 0000000000000000 RSI: ffffffff82609d48 RDI: ffff88801bae7a20
RBP: 0000000000000001 R08: ffff88801bae79bf R09: 1ffff1100375cf37
R10: dffffc0000000000 R11: ffffed100375cf38 R12: 0000000000000001
R13: ffffffff82609d48 R14: ffff88801bae7a20 R15: ffff88801cefcd88
 up_read+0x16/0x20 kernel/locking/rwsem.c:1632
 kernfs_iop_permission+0x308/0x430 fs/kernfs/inode.c:292
 do_inode_permission fs/namei.c:526 [inline]
 inode_permission+0x285/0x470 fs/namei.c:593
 may_lookup fs/namei.c:1858 [inline]
 link_path_walk+0x232/0xea0 fs/namei.c:2467
 path_lookupat+0x97/0x430 fs/namei.c:2675
 filename_lookup+0x212/0x570 fs/namei.c:2705
 vfs_statx+0xf8/0x550 fs/stat.c:353
 vfs_fstatat+0x118/0x170 fs/stat.c:375
 __do_sys_newfstatat fs/stat.c:542 [inline]
 __se_sys_newfstatat fs/stat.c:536 [inline]
 __x64_sys_newfstatat+0x116/0x190 fs/stat.c:536
 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: 0033:0x7f09e9511b0a
Code: 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 8b 15 b9 f2 0d 00 f7
RSP: 002b:00007ffc4d12d878 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007ffc4d12dd10 RCX: 00007f09e9511b0a
RDX: 00007ffc4d12d880 RSI: 00007ffc4d12dd10 RDI: 00000000ffffff9c
RBP: 000056066aa96910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc4d12d910
R13: 000056063cace100 R14: 000056066aab4db0 R15: 00007ffc4d12e330
 </TASK>