EXT4-fs (loop9): initial error at time 1776234214: ext4_orphan_get:1423
EXT4-fs (loop9): last error at time 1776234214: ext4_orphan_get:1423
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5191/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=62825, q=918 ncpus=2)
task:udevd state:R running task stack:22360 pid:5191 tgid:5191 ppid:1 task_flags:0x400140 flags:0x00080800
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7183
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7507
irqentry_exit+0x5e4/0x700 kernel/entry/common.c:240
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:118 [inline]
RIP: 0010:lock_acquire+0x8b/0x350 kernel/locking/lockdep.c:5844
Code: 0f 84 ca 01 00 00 83 3d 52 af 70 0e 00 0f 84 d3 00 00 00 48 8b b4 24 90 00 00 00 4c 89 ef e8 bc ec 8d 00 83 3d 35 af 70 0e 00 <0f> 84 ce 00 00 00 65 8b 05 48 30 7b 11 85 c0 0f 85 bf 00 00 00 65
RSP: 0018:ffffc90003b17710 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff826f0368 RDI: 1ffffffff1ceba04
RBP: ffffffff826f034c R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff826f16e0 R12: 0000000000000002
R13: ffffffff8e75d020 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:847 [inline]
class_rcu_constructor include/linux/rcupdate.h:1190 [inline]
kernfs_root+0x38/0x230 fs/kernfs/kernfs-internal.h:74
kernfs_iop_permission+0x6c/0x430 fs/kernfs/inode.c:286
do_inode_permission fs/namei.c:578 [inline]
inode_permission+0x46f/0x5f0 fs/namei.c:648
lookup_inode_permission_may_exec fs/namei.c:-1 [inline]
may_lookup fs/namei.c:1972 [inline]
link_path_walk+0x1149/0x18d0 fs/namei.c:2600
path_openat+0x2c3/0x3860 fs/namei.c:4854
do_file_open+0x23e/0x4a0 fs/namei.c:4887
do_sys_openat2+0x113/0x200 fs/open.c:1364
do_sys_open fs/open.c:1370 [inline]
__do_sys_openat fs/open.c:1386 [inline]
__se_sys_openat fs/open.c:1381 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1381
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6410ca7407
RSP: 002b:00007ffe2c216e40 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f641146d880 RCX: 00007f6410ca7407
RDX: 0000000000080000 RSI: 00007ffe2c216fc0 RDI: ffffffffffffff9c
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000056076d3517f5
R13: 000056076d3517f5 R14: 0000000000000001 R15: 00007ffe2c21b630
rcu: rcu_preempt kthread starved for 10493 jiffies! g62825 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:27544 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7183
__schedule_loop kernel/sched/core.c:7262 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7277
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11570 Comm: syz.7.1599 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
RIP: 0010:lock_release+0x25e/0x3c0 kernel/locking/lockdep.c:5891
Code: 89 c5 7f d0 4c 89 ff 4c 89 f6 48 8b 54 24 18 e8 28 2f 00 00 48 8b 5c 24 08 48 c7 c7 a4 f2 16 8e e8 67 88 0b 0a b8 ff ff ff ff <65> 0f c1 05 9a fd 7a 11 83 f8 01 75 2e 9c 58 a9 00 02 00 00 75 42
RSP: 0018:ffffc90002f67a20 EFLAGS: 00000006
RAX: 00000000ffffffff RBX: 0000000000000006 RCX: 0000000080000003
RDX: 0000000000000002 RSI: ffffffff8e16f2a4 RDI: ffffffff8c27e080
RBP: ffff888054afc960 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520005ecf40 R12: 0000000000000002
R13: 0000000000000002 R14: ffffffff9a53dbc8 R15: ffff888054afbd80
FS: 00007fd3334156c0(0000) GS:ffff88812555a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000200 CR3: 000000007c9d9000 CR4: 0000000000350ef0
Call Trace:
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:176 [inline]
_raw_spin_unlock_irqrestore+0x1b/0x80 kernel/locking/spinlock.c:198
debug_object_activate+0x320/0x580 lib/debugobjects.c:853
debug_hrtimer_activate kernel/time/hrtimer.c:485 [inline]
debug_activate kernel/time/hrtimer.c:528 [inline]
remove_and_enqueue_same_base kernel/time/hrtimer.c:1259 [inline]
__hrtimer_start_range_ns kernel/time/hrtimer.c:1396 [inline]
hrtimer_start_range_ns+0x579/0xed0 kernel/time/hrtimer.c:1491
__posixtimer_deliver_signal kernel/time/posix-timers.c:314 [inline]
posixtimer_deliver_signal+0x1ce/0x3f0 kernel/time/posix-timers.c:340
dequeue_signal+0x249/0x370 kernel/signal.c:660
get_signal+0x55d/0x1330 kernel/signal.c:2918
arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline]
do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd33259c817
Code: 83 c8 ff c3 66 2e 0f 1f 84 00 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
RSP: 002b:00007fd3334150e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fd332815fa8 RCX: 00007fd33259c819
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd332815fa8
RBP: 00007fd332815fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd332816038 R14: 00007ffcd1aac800 R15: 00007ffcd1aac8e8