INFO: task kworker/0:0:8 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0 state:D stack:23688 pid:8 ppid:2 flags:0x00004000
Workqueue: gfs2_recovery gfs2_recover_func
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
io_schedule+0x80/0xd0 kernel/sched/core.c:9024
folio_wait_bit_common+0x881/0xfa0 mm/filemap.c:1329
folio_wait_locked include/linux/pagemap.h:1149 [inline]
gfs2_jhead_process_page+0x17e/0x750 fs/gfs2/lops.c:477
gfs2_find_jhead+0xc84/0xdc0 fs/gfs2/lops.c:594
gfs2_recover_func+0x6cd/0x1c80 fs/gfs2/recovery.c:460
process_one_work kernel/workqueue.c:2657 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
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
INFO: task syz.9.2897:17425 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.2897 state:D stack:24688 pid:17425 ppid:12717 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
bit_wait+0x11/0xd0 kernel/sched/wait_bit.c:199
__wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
wait_on_bit include/linux/wait_bit.h:76 [inline]
gfs2_recover_journal+0xda/0x130 fs/gfs2/recovery.c:577
init_journal+0x1838/0x22f0 fs/gfs2/ops_fstype.c:833
init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:886
gfs2_fill_super+0x1828/0x1f90 fs/gfs2/ops_fstype.c:1266
get_tree_bdev+0x3e5/0x520 fs/super.c:1599
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1344
vfs_get_tree+0x8c/0x280 fs/super.c:1772
do_new_mount+0x24a/0xa40 fs/namespace.c:3386
do_mount fs/namespace.c:3726 [inline]
__do_sys_mount fs/namespace.c:3935 [inline]
__se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f54ba19f54a
RSP: 002b:00007f54bb0d9e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f54bb0d9ee0 RCX: 00007f54ba19f54a
RDX: 0000200000000640 RSI: 0000200000000680 RDI: 00007f54bb0d9ea0
RBP: 0000200000000640 R08: 00007f54bb0d9ee0 R09: 0000000000000010
R10: 0000000000000010 R11: 0000000000000246 R12: 0000200000000680
R13: 00007f54bb0d9ea0 R14: 0000000000038011 R15: 00002000000006c0
Showing all locks held in the system:
2 locks held by kworker/0:0/8:
#0: ffff8881422ae938 ((wq_completion)gfs2_recovery){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
#0: ffff8881422ae938 ((wq_completion)gfs2_recovery){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
#1: ffffc900000d7d00 ((work_completion)(&jd->jd_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
#1: ffffc900000d7d00 ((work_completion)(&jd->jd_work)){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
1 lock held by khungtaskd/28:
#0: ffffffff8df320e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8df320e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8df320e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6669
2 locks held by getty/5534:
#0:
ffff888032ad20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000327e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x428/0x1370 drivers/tty/n_tty.c:2217
1 lock held by syz.9.2897/17425:
#0: ffff88807967c0e0 (&type->s_umount_key#89
){+.+.}-{3:3}
, at: __super_lock fs/super.c:56 [inline]
, at: __super_lock_excl fs/super.c:71 [inline]
, at: get_tree_bdev+0x345/0x520 fs/super.c:1597
2 locks held by syz.8.3628/20281:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 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+0xf59/0xfa0 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 20281 Comm: syz.8.3628 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:io_serial_out+0x7c/0xc0 drivers/tty/serial/8250/8250_port.c:424
Code: e7 d3 fc 44 89 f9 d3 e5 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 9c c8 2c fd 41 03 2e 89 d8 89 ea ee <5b> 41 5c 41 5e 41 5f 5d c3 44 89 f9 80 e1 07 38 c1 7c aa 4c 89 ff
RSP: 0018:ffffc9000eb76ed0 EFLAGS: 00000002
RAX: 0000000000000038 RBX: 0000000000000038 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 00000000000003f8 R08: ffff888021ab0237 R09: 1ffff11004356046
R10: dffffc0000000000 R11: ffffed1004356047 R12: dffffc0000000000
R13: ffffffff981388e4 R14: ffffffff9842ad80 R15: 0000000000000000
FS: 00007f9af28566c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557d1e74e8 CR3: 0000000032533000 CR4: 00000000003506f0
Call Trace:
serial_out drivers/tty/serial/8250/8250.h:122 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:-1 [inline]
serial8250_console_write+0x11f0/0x18b0 drivers/tty/serial/8250/8250_port.c:3487
console_emit_next_record kernel/printk/printk.c:2944 [inline]
console_flush_all+0x6ad/0xcf0 kernel/printk/printk.c:3000
console_unlock+0xad/0x350 kernel/printk/printk.c:3069
vprintk_emit+0x497/0x610 kernel/printk/printk.c:2341
_printk+0xde/0x130 kernel/printk/printk.c:2366
__dynamic_pr_debug+0x1a3/0x260 lib/dynamic_debug.c:879
__kernfs_remove+0x827/0x830 fs/kernfs/dir.c:1464
kernfs_remove_by_name_ns+0xdc/0x150 fs/kernfs/dir.c:1695
sysfs_remove_file_ns fs/sysfs/file.c:497 [inline]
sysfs_remove_file include/linux/sysfs.h:629 [inline]
sysfs_remove_files+0x93/0xe0 fs/sysfs/file.c:530
btrfs_sysfs_remove_mounted+0x165/0x2a0 fs/btrfs/sysfs.c:1477
open_ctree+0x221d/0x2d50 fs/btrfs/disk-io.c:3604
btrfs_fill_super+0x1c2/0x300 fs/btrfs/super.c:1163
btrfs_mount_root+0x88b/0x8f0 fs/btrfs/super.c:1527
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1772
fc_mount fs/namespace.c:1117 [inline]
vfs_kern_mount+0xbe/0x160 fs/namespace.c:1147
btrfs_mount+0x32d/0xb10 fs/btrfs/super.c:1587
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1772
do_new_mount+0x24a/0xa40 fs/namespace.c:3386
do_mount fs/namespace.c:3726 [inline]
__do_sys_mount fs/namespace.c:3935 [inline]
__se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9af199f54a
Code: 48 c7 c2 e8 ff ff ff 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 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9af2855e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9af2855ee0 RCX: 00007f9af199f54a
RDX: 00002000000051c0 RSI: 0000200000005200 RDI: 00007f9af2855ea0
RBP: 00002000000051c0 R08: 00007f9af2855ee0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000005200
R13: 00007f9af2855ea0 R14: 00000000000051aa R15: 0000200000005240