INFO: task syz.7.48:4142 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.48 state:D stack:13224 pid: 4142 ppid: 2378 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x2b8/0x790 kernel/sched/core.c:6395
schedule+0x53/0x90 kernel/sched/core.c:6478
schedule_timeout+0x100/0x140 kernel/time/timer.c:1890
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x7f/0xe0 kernel/sched/completion.c:138
kthread_stop+0x6e/0x170 kernel/kthread.c:666
gfs2_make_fs_ro+0x57/0x2b0 fs/gfs2/super.c:533
signal_our_withdraw fs/gfs2/util.c:166 [inline]
gfs2_withdraw.cold+0x161/0x4c0 fs/gfs2/util.c:343
gfs2_metatype_check_ii+0x30/0x40 fs/gfs2/util.c:520
gfs2_metatype_check_i fs/gfs2/util.h:129 [inline]
gfs2_quota_init+0x483/0x4c0 fs/gfs2/quota.c:1406
gfs2_make_fs_rw+0xd4/0x160 fs/gfs2/super.c:155
gfs2_fill_super+0xb84/0xbe0 fs/gfs2/ops_fstype.c:1276
get_tree_bdev+0x178/0x280 fs/super.c:1325
gfs2_get_tree+0x1c/0x90 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x18/0x70 fs/super.c:1530
do_new_mount fs/namespace.c:3025 [inline]
path_mount+0x2c2/0xc60 fs/namespace.c:3355
do_mount fs/namespace.c:3368 [inline]
__do_sys_mount fs/namespace.c:3576 [inline]
__se_sys_mount fs/namespace.c:3553 [inline]
__x64_sys_mount+0xfe/0x140 fs/namespace.c:3553
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f19dfb0c90a
RSP: 002b:00007f19df57ce68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f19df57cef0 RCX: 00007f19dfb0c90a
RDX: 0000200000000400 RSI: 0000200000012500 RDI: 00007f19df57ceb0
RBP: 0000200000000400 R08: 00007f19df57cef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000012500
R13: 00007f19df57ceb0 R14: 00000000000125bb R15: 00002000000004c0
INFO: task gfs2_quotad:4153 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:gfs2_quotad state:D stack:13464 pid: 4153 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x2b8/0x790 kernel/sched/core.c:6395
schedule+0x53/0x90 kernel/sched/core.c:6478
bit_wait+0x8/0x50 kernel/sched/wait_bit.c:199
__wait_on_bit+0x23/0x80 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x90/0xb0 kernel/sched/wait_bit.c:64
wait_on_bit include/linux/wait_bit.h:76 [inline]
wait_on_bit include/linux/wait_bit.h:71 [inline]
__gfs2_glock_dq+0x1c8/0x280 fs/gfs2/glock.c:1588
gfs2_glock_dq fs/gfs2/glock.c:1652 [inline]
gfs2_glock_dq_uninit+0x1d/0x60 fs/gfs2/glock.c:1672
gfs2_statfs_sync+0x7c/0x190 fs/gfs2/super.c:310
gfs2_quotad+0x21d/0x2d0 fs/gfs2/quota.c:1576
kthread+0x10b/0x130 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Showing all locks held in the system:
1 lock held by khungtaskd/25:
#0: ffffffff82fda400 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0xf2 kernel/locking/lockdep.c:6472
1 lock held by udevd/765:
#0: ffff888107fc7f18 (&disk->open_mutex){....}-{3:3}, at: blkdev_get_by_dev+0x51/0x2e0 block/bdev.c:820
2 locks held by getty/881:
#0: ffff8881049f2098 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x50 drivers/tty/tty_ldisc.c:252
#1: ffffc9000182f2e8 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x4eb/0x610 drivers/tty/n_tty.c:2158
1 lock held by syz-executor/2376:
#0: ffff888107fc6f18 (&disk->open_mutex){....}-{3:3}, at: blkdev_get_by_dev+0x51/0x2e0 block/bdev.c:820
2 locks held by udevd/2453:
#0: ffff888107fc6f18 (&disk->open_mutex){....}-{3:3}, at: blkdev_put+0x35/0x1e0 block/bdev.c:915
#1: ffff8881045f5c68 (&lo->lo_mutex){....}-{3:3}, at: __loop_clr_fd+0x5b/0x5b0 drivers/block/loop.c:1366
2 locks held by kworker/0:3/2613:
#0: ffff888100063138 ((wq_completion)rcu_gp){....}-{0:0}, at: wake_up_worker kernel/workqueue.c:859 [inline]
#0: ffff888100063138 ((wq_completion)rcu_gp){....}-{0:0}, at: process_one_work+0x1c1/0x440 kernel/workqueue.c:2273
#1: ffffc9000188fe70 ((work_completion)(&rew.rew_work)){....}-{0:0}, at: wake_up_worker kernel/workqueue.c:859 [inline]
#1: ffffc9000188fe70 ((work_completion)(&rew.rew_work)){....}-{0:0}, at: process_one_work+0x1c1/0x440 kernel/workqueue.c:2273
1 lock held by syz.7.48/4142:
#0: ffff888178a530e0 (&type->s_umount_key#45/1){....}-{3:3}, at: alloc_super+0xde/0x3d0 fs/super.c:229
3 locks held by kworker/0:5/5491:
#0: ffff888100062538 ((wq_completion)events){....}-{0:0}, at: wake_up_worker kernel/workqueue.c:859 [inline]
#0: ffff888100062538 ((wq_completion)events){....}-{0:0}, at: process_one_work+0x1c1/0x440 kernel/workqueue.c:2273
#1: ffffc90004e83e70 ((work_completion)(&pwq->unbound_release_work)){....}-{0:0}, at: wake_up_worker kernel/workqueue.c:859 [inline]
#1: ffffc90004e83e70 ((work_completion)(&pwq->unbound_release_work)){....}-{0:0}, at: process_one_work+0x1c1/0x440 kernel/workqueue.c:2273
#2: ffffffff82fdae68 (rcu_state.exp_mutex){....}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
#2: ffffffff82fdae68 (rcu_state.exp_mutex){....}-{3:3}, at: synchronize_rcu_expedited+0xe6/0x390 kernel/rcu/tree_exp.h:845
1 lock held by syz.5.610/5719:
#0: ffff8881045f4468 (&lo->lo_mutex){....}-{3:3}, at: __loop_clr_fd+0x5b/0x5b0 drivers/block/loop.c:1366
2 locks held by syz.8.613/5725:
#0: ffff888107fc7f18 (&disk->open_mutex){....}-{3:3}, at: blkdev_put+0x35/0x1e0 block/bdev.c:915
#1: ffff8881045f8c68 (&lo->lo_mutex){....}-{3:3}, at: lo_release+0x1b/0x90 drivers/block/loop.c:2071
2 locks held by syz.1.615/5727:
#0: ffff888107fc4718 (&disk->open_mutex){....}-{3:3}, at: blkdev_put+0x35/0x1e0 block/bdev.c:915
#1: ffff8881045de468 (&lo->lo_mutex){....}-{3:3}, at: lo_release+0x1b/0x90 drivers/block/loop.c:2071
2 locks held by syz.3.616/5730:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 25 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x41/0x5e lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x32/0x80 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x81/0x90 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0x47f/0x4b0 kernel/hung_task.c:369
kthread+0x10b/0x130 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:729