INFO: task syz-executor:5897 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21736 pid:5897 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
bit_wait+0x11/0xd0 kernel/sched/wait_bit.c:199
__wait_on_bit+0xac/0x2d0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x123/0x170 kernel/sched/wait_bit.c:64
wait_on_bit include/linux/wait_bit.h:76 [inline]
gfs2_glock_wait+0xbd/0x2a0 fs/gfs2/glock.c:1380
gfs2_glock_nq_init fs/gfs2/glock.h:252 [inline]
__gfs2_lookup+0x118/0x270 fs/gfs2/inode.c:905
__lookup_slow+0x281/0x3b0 fs/namei.c:1702
lookup_slow+0x53/0x70 fs/namei.c:1719
walk_component+0x2be/0x3f0 fs/namei.c:2010
lookup_last fs/namei.c:2467 [inline]
path_lookupat+0x169/0x440 fs/namei.c:2491
filename_lookup+0x1f4/0x510 fs/namei.c:2520
user_path_at_empty+0x42/0x60 fs/namei.c:2917
user_path_at include/linux/namei.h:57 [inline]
ksys_umount fs/namespace.c:1921 [inline]
__do_sys_umount fs/namespace.c:1929 [inline]
__se_sys_umount fs/namespace.c:1927 [inline]
__x64_sys_umount+0xf5/0x170 fs/namespace.c:1927
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7bde990a77
RSP: 002b:00007ffdcbca6868 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f7bdea13d7d RCX: 00007f7bde990a77
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdcbca6920
RBP: 00007ffdcbca6920 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdcbca7a10
R13: 00007f7bdea13d7d R14: 0000555584a774a8 R15: 00007ffdcbca9bd0
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by getty/5529:
#0: ffff8880311120a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x425/0x1380 drivers/tty/n_tty.c:2217
1 lock held by syz-executor/5897:
#0: ffff888061899c40 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff888061899c40 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1718
2 locks held by syz.1.200/6527:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x39b/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf41/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6527 Comm: syz.1.200 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0x96/0x120 kernel/kcov.c:350
Code: 41 54 53 48 8b 54 24 20 65 4c 8b 05 c4 1f 7e 7e 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 65 44 8b 1d b2 1f 7e 7e <41> 81 e3 00 01 ff 00 74 13 41 81 fb 00 01 00 00 75 d9 41 83 b8 1c
RSP: 0018:ffffc90004d16d90 EFLAGS: 00000216
RAX: 0000000000000012 RBX: ffff0a1000000600 RCX: 0000000000000001
RDX: ffffffff8a582695 RSI: ffffffff8e324180 RDI: 0000000000000000
RBP: ffffffff8aab7e4c R08: ffff88802a54da00 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000080000001 R12: ffffc90084d1707f
R13: ffffc90004d1708d R14: 0000000000000001 R15: ffffffff8aab7e4b
FS: 000055556bc72500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffab2c4295f CR3: 000000002108e000 CR4: 00000000003506e0
Call Trace:
vsnprintf+0x105/0x1a40 lib/vsprintf.c:2779
sprintf+0xda/0x120 lib/vsprintf.c:3027
print_time kernel/printk/printk.c:1327 [inline]
info_print_prefix+0x156/0x300 kernel/printk/printk.c:1353
record_print_text+0x155/0x420 kernel/printk/printk.c:1402
printk_get_next_message+0x282/0x8e0 kernel/printk/printk.c:2876
console_emit_next_record kernel/printk/printk.c:2911 [inline]
console_flush_all+0x3ad/0xd00 kernel/printk/printk.c:3000
console_unlock+0xae/0x340 kernel/printk/printk.c:3069
vprintk_emit+0x477/0x600 kernel/printk/printk.c:2341
_printk+0xd0/0x110 kernel/printk/printk.c:2366
sysfs_warn_dup fs/sysfs/dir.c:29 [inline]
sysfs_create_dir_ns+0x251/0x280 fs/sysfs/dir.c:63
create_dir lib/kobject.c:73 [inline]
kobject_add_internal+0x6b8/0xc70 lib/kobject.c:240
kobject_add_varg lib/kobject.c:374 [inline]
kobject_init_and_add+0x126/0x190 lib/kobject.c:457
gfs2_sys_fs_add+0x238/0x470 fs/gfs2/sys.c:737
gfs2_fill_super+0x1323/0x1f80 fs/gfs2/ops_fstype.c:1219
get_tree_bdev+0x3e4/0x510 fs/super.c:1591
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1344
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3386
do_mount fs/namespace.c:3726 [inline]
__do_sys_mount fs/namespace.c:3935 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffab2b90eea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffa71d75f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fffa71d7680 RCX: 00007ffab2b90eea
RDX: 0000200000000000 RSI: 0000200000000100 RDI: 00007fffa71d7640
RBP: 0000200000000000 R08: 00007fffa71d7680 R09: 0000000000208c1b
R10: 0000000000208c1b R11: 0000000000000246 R12: 0000200000000100
R13: 00007fffa71d7640 R14: 0000000000012754 R15: 0000200000012900