INFO: task syz-executor:5833 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22496 pid:5833 tgid:5833 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1539/0x5080 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
bit_wait+0x11/0xd0 kernel/sched/wait_bit.c:240
__wait_on_bit+0xb9/0x310 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit include/linux/wait_bit.h:77 [inline]
gfs2_glock_wait+0xbd/0x2a0 fs/gfs2/glock.c:1269
gfs2_glock_nq_init fs/gfs2/glock.h:253 [inline]
__gfs2_lookup+0x134/0x2a0 fs/gfs2/inode.c:999
__lookup_slow+0x2b7/0x410 fs/namei.c:1916
lookup_slow+0x53/0x70 fs/namei.c:1933
walk_component fs/namei.c:2279 [inline]
lookup_last fs/namei.c:2780 [inline]
path_lookupat+0x3f5/0x8c0 fs/namei.c:2804
filename_lookup+0x256/0x5d0 fs/namei.c:2833
user_path_at+0x40/0x160 fs/namei.c:3612
ksys_umount fs/namespace.c:2052 [inline]
__do_sys_umount fs/namespace.c:2060 [inline]
__se_sys_umount fs/namespace.c:2058 [inline]
__x64_sys_umount+0xf6/0x170 fs/namespace.c:2058
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4f9a99c117
RSP: 002b:00007ffced7d41a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f4f9aa0471f RCX: 00007f4f9a99c117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffced7d4260
RBP: 00007ffced7d4260 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffced7d5350
R13: 00007f4f9aa0471f R14: 000000000003f2f9 R15: 00007ffced7d7510
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e760160 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e760160 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e760160 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:4/75:
#0: ffff88801dfa4148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x855/0x15a0 kernel/workqueue.c:3254
#1: ffffc9000256fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x15a0 kernel/workqueue.c:3255
2 locks held by getty/5583:
#0: ffff8880347730a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036bb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5833:
#0: ffff888057e450c8 (&type->i_mutex_dir_key#23){.+.+}-{4:4}, at: inode_lock_shared include/linux/fs.h:1043 [inline]
#0: ffff888057e450c8 (&type->i_mutex_dir_key#23){.+.+}-{4:4}, at: lookup_slow+0x46/0x70 fs/namei.c:1932
2 locks held by kworker/u8:16/9993:
#0: ffff88801dfa4148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x855/0x15a0 kernel/workqueue.c:3254
#1: ffffc9000b26fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x15a0 kernel/workqueue.c:3255
1 lock held by syz.6.943/10521:
#0: ffffffff8e7662c0 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580 kernel/rcu/tree.c:3828
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:347 [inline]
watchdog+0xff4/0x1040 kernel/hung_task.c:516
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5831 Comm: udevd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:-1 [inline]
RIP: 0010:debug_check_no_obj_freed+0x1f1/0x550 lib/debugobjects.c:1129
Code: 0f 84 44 03 00 00 49 89 ee 49 c1 ee 03 41 80 3c 16 00 74 12 48 89 ef e8 cd 1b 7d fd 48 ba 00 00 00 00 00 fc ff df 48 8b 45 00 <48> 89 04 24 4c 8d 7d 18 4c 89 f8 48 c1 e8 03 80 3c 10 00 74 12 4c
RSP: 0018:ffffc9000475f7d0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 000000000000003b RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc9000475f740
RBP: ffff88802bf52070 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520008ebee8 R12: ffff88807e6e1000
R13: ffff88807e6e0000 R14: 1ffff110057ea40e R15: ffffea0001e4add0
FS: 00007f1fc938e880(0000) GS:ffff888125296000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557f085a28 CR3: 000000007430a000 CR4: 00000000003526f0
Call Trace:
slab_free_hook mm/slub.c:2598 [inline]
slab_free mm/slub.c:6079 [inline]
kfree+0x13a/0x610 mm/slub.c:6392
tomoyo_realpath_from_path+0x598/0x5d0 security/tomoyo/realpath.c:286
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x283/0x560 security/tomoyo/file.c:827
security_inode_getattr+0x12b/0x310 security/security.c:1869
vfs_getattr+0x23/0x70 fs/stat.c:259
vfs_statx_path+0x2b/0x230 fs/stat.c:299
vfs_statx+0x12e/0x200 fs/stat.c:356
vfs_fstatat+0x11b/0x170 fs/stat.c:373
__do_sys_newfstatat fs/stat.c:538 [inline]
__se_sys_newfstatat fs/stat.c:532 [inline]
__x64_sys_newfstatat+0x151/0x200 fs/stat.c:532
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1fc8d11b0a
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:00007ffecfbf9008 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 000000000000000e RCX: 00007f1fc8d11b0a
RDX: 00007ffecfbf9010 RSI: 00007ffecfbf90e0 RDI: 00000000ffffff9c
RBP: 00007ffecfbfa120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffecfbfa540
R13: 0000000000000000 R14: 000055be95978100 R15: 000055be95978140
----------------
Code disassembly (best guess):
0: 0f 84 44 03 00 00 je 0x34a
6: 49 89 ee mov %rbp,%r14
9: 49 c1 ee 03 shr $0x3,%r14
d: 41 80 3c 16 00 cmpb $0x0,(%r14,%rdx,1)
12: 74 12 je 0x26
14: 48 89 ef mov %rbp,%rdi
17: e8 cd 1b 7d fd call 0xfd7d1be9
1c: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
23: fc ff df
26: 48 8b 45 00 mov 0x0(%rbp),%rax
* 2a: 48 89 04 24 mov %rax,(%rsp) <-- trapping instruction
2e: 4c 8d 7d 18 lea 0x18(%rbp),%r15
32: 4c 89 f8 mov %r15,%rax
35: 48 c1 e8 03 shr $0x3,%rax
39: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1)
3d: 74 12 je 0x51
3f: 4c rex.WR