INFO: task syz-executor:6605 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21576 pid:6605 tgid:6605 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
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
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+0x123/0x170 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:1335
gfs2_glock_nq_init fs/gfs2/glock.h:252 [inline]
__gfs2_lookup+0x117/0x270 fs/gfs2/inode.c:984
__lookup_slow+0x297/0x3d0 fs/namei.c:1816
lookup_slow+0x53/0x70 fs/namei.c:1833
walk_component+0x2d2/0x400 fs/namei.c:2151
lookup_last fs/namei.c:2652 [inline]
path_lookupat+0x163/0x430 fs/namei.c:2676
filename_lookup+0x212/0x570 fs/namei.c:2705
user_path_at+0x3a/0x60 fs/namei.c:3215
ksys_umount fs/namespace.c:2061 [inline]
__do_sys_umount fs/namespace.c:2069 [inline]
__se_sys_umount fs/namespace.c:2067 [inline]
__x64_sys_umount+0xee/0x160 fs/namespace.c:2067
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: 0033:0x7fce905901f7
RSP: 002b:00007fffb319f848 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007fce90611d7d RCX: 00007fce905901f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffb319f900
RBP: 00007fffb319f900 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffb31a09f0
R13: 00007fce90611d7d R14: 000000000002cb6d R15: 00007fffb31a2bb0
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e33d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e33d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e33d2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5622:
#0: ffff8880344510a0 (&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+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/6605:
#0: ffff88805a162268 (&type->i_mutex_dir_key#15){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:995 [inline]
#0: ffff88805a162268 (&type->i_mutex_dir_key#15){++++}-{4:4}, at: lookup_slow+0x46/0x70 fs/namei.c:1832
1 lock held by syz.6.515/9794:
2 locks held by syz.9.518/9783:
#0: ffff88805ca707c8 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline]
#0: ffff88805ca707c8 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: __sock_release net/socket.c:648 [inline]
#0: ffff88805ca707c8 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: sock_close+0x9b/0x240 net/socket.c:1442
#1: ffffffff8e342d78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#1: ffffffff8e342d78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730 kernel/rcu/tree_exp.h:957
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
watchdog+0xf60/0xfa0 kernel/hung_task.c:495
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
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6014 Comm: udevd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:unwind_next_frame+0x1883/0x2390 arch/x86/kernel/unwind_orc.c:665
Code: 20 ca 80 fa 01 0f 85 63 01 00 00 49 8d 4c 24 08 4c 39 e9 0f 86 55 01 00 00 48 39 c1 0f 87 4c 01 00 00 4c 3b a4 24 90 00 00 00 <4c> 8b 7c 24 48 0f 87 c9 00 00 00 49 8d 5e 28 48 89 d8 48 c1 e8 03
RSP: 0018:ffffc9000b567878 EFLAGS: 00000216
RAX: ffffc9000b568000 RBX: ffffffff90610201 RCX: ffffc9000b567ce8
RDX: ffffc9000b567901 RSI: dffffc0000000000 RDI: ffffc9000b567950
RBP: dffffc0000000000 R08: ffffc9000b567cd0 R09: 0000000000000000
R10: ffffc9000b567998 R11: fffff520016acf35 R12: ffffc9000b567ce0
R13: ffffc9000b560000 R14: ffffc9000b567948 R15: ffffc9000b567958
FS: 00007f52b2231880(0000) GS:ffff888125afc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556d6ea608 CR3: 000000007220e000 CR4: 00000000003526f0
Call Trace:
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
unpoison_slab_object mm/kasan/common.c:342 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4946 [inline]
slab_alloc_node mm/slub.c:5245 [inline]
kmem_cache_alloc_noprof+0x367/0x6e0 mm/slub.c:5252
getname_flags+0xb8/0x540 fs/namei.c:146
user_path_at+0x24/0x60 fs/namei.c:3214
inotify_find_inode fs/notify/inotify/inotify_user.c:377 [inline]
__do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:771 [inline]
__se_sys_inotify_add_watch+0x182/0xf10 fs/notify/inotify/inotify_user.c:729
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: 0033:0x7f52b1b219a7
Code: f0 ff ff 73 01 c3 48 8b 0d 4e f4 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 fe 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 21 f4 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffde2c04a28 EFLAGS: 00000202 ORIG_RAX: 00000000000000fe
RAX: ffffffffffffffda RBX: 00005622a31a3b20 RCX: 00007f52b1b219a7
RDX: 0000000000000008 RSI: 00005622a31a9f40 RDI: 0000000000000007
RBP: 00005622a3191910 R08: 00000000000001d0 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000202 R12: 00005622a31a3b20
R13: 00005622a319f190 R14: 0000000000000008 R15: 00005622a31a3b20