INFO: task syz-executor.4:26977 blocked for more than 140 seconds.
Not tainted 4.14.114+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D28000 26977 1869 0x80000002
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3498
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
__lo_release drivers/block/loop.c:1644 [inline]
lo_release+0x78/0x190 drivers/block/loop.c:1668
__blkdev_put+0x518/0x6d0 fs/block_dev.c:1791
blkdev_close+0x86/0xb0 fs/block_dev.c:1863
__fput+0x25e/0x700 fs/file_table.c:210
task_work_run+0x118/0x190 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x903/0x2960 kernel/exit.c:874
INFO: task syz-executor.3:26974 blocked for more than 140 seconds.
Not tainted 4.14.114+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D28000 26974 19061 0x80000002
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3498
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
blkdev_put+0x27/0x4c0 fs/block_dev.c:1814
blkdev_close+0x86/0xb0 fs/block_dev.c:1863
__fput+0x25e/0x700 fs/file_table.c:210
task_work_run+0x118/0x190 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x903/0x2960 kernel/exit.c:874
INFO: task syz-executor.1:26979 blocked for more than 140 seconds.
Not tainted 4.14.114+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D27168 26979 1846 0x00000006
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3498
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
lo_release+0x19/0x190 drivers/block/loop.c:1667
__blkdev_put+0x518/0x6d0 fs/block_dev.c:1791
blkdev_close+0x86/0xb0 fs/block_dev.c:1863
__fput+0x25e/0x700 fs/file_table.c:210
task_work_run+0x118/0x190 kernel/task_work.c:113
get_signal+0x1682/0x1a90 kernel/signal.c:2220
do_signal+0x96/0x15c0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0x11d/0x160 arch/x86/entry/common.c:159
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
do_syscall_64+0x372/0x4b0 arch/x86/entry/common.c:294
INFO: task syz-executor.5:26989 blocked for more than 140 seconds.
Not tainted 4.14.114+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28320 26989 1851 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3498
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
loop_reread_partitions+0x72/0x80 drivers/block/loop.c:615
loop_set_status+0xbff/0x11f0 drivers/block/loop.c:1184
INFO: task syz-executor.5:26992 blocked for more than 140 seconds.
Not tainted 4.14.114+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D29248 26992 1851 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3498
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
lo_open+0x19/0xb0 drivers/block/loop.c:1624
__blkdev_get+0x963/0xf90 fs/block_dev.c:1537
blkdev_get+0x97/0x8b0 fs/block_dev.c:1612
blkdev_open+0x1cc/0x250 fs/block_dev.c:1770
do_dentry_open+0x44e/0xdf0 fs/open.c:770
vfs_open+0x105/0x230 fs/open.c:884
do_last fs/namei.c:3455 [inline]
path_openat+0xb6b/0x2b70 fs/namei.c:3597
do_filp_open+0x1a1/0x280 fs/namei.c:3631
do_sys_open+0x2ca/0x590 fs/open.c:1077
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task syz-executor.5:27032 blocked for more than 140 seconds.
Not tainted 4.14.114+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D27616 27032 1851 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3498
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
__blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
blkdev_get+0x97/0x8b0 fs/block_dev.c:1612
blkdev_open+0x1cc/0x250 fs/block_dev.c:1770
do_dentry_open+0x44e/0xdf0 fs/open.c:770
vfs_open+0x105/0x230 fs/open.c:884
do_last fs/namei.c:3455 [inline]
path_openat+0xb6b/0x2b70 fs/namei.c:3597
do_filp_open+0x1a1/0x280 fs/namei.c:3631
do_sys_open+0x2ca/0x590 fs/open.c:1077
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task syz-executor.5:27033 blocked for more than 140 seconds.
Not tainted 4.14.114+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28448 27033 1851 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3498
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
__blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
blkdev_get+0x97/0x8b0 fs/block_dev.c:1612
blkdev_open+0x1cc/0x250 fs/block_dev.c:1770
do_dentry_open+0x44e/0xdf0 fs/open.c:770
vfs_open+0x105/0x230 fs/open.c:884
do_last fs/namei.c:3455 [inline]
path_openat+0xb6b/0x2b70 fs/namei.c:3597
do_filp_open+0x1a1/0x280 fs/namei.c:3631
do_sys_open+0x2ca/0x590 fs/open.c:1077
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task blkid:26988 blocked for more than 140 seconds.
Not tainted 4.14.114+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D28776 26988 3022 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3498
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
lo_open+0x19/0xb0 drivers/block/loop.c:1624
__blkdev_get+0x963/0xf90 fs/block_dev.c:1537
blkdev_get+0x97/0x8b0 fs/block_dev.c:1612
blkdev_open+0x1cc/0x250 fs/block_dev.c:1770
do_dentry_open+0x44e/0xdf0 fs/open.c:770
vfs_open+0x105/0x230 fs/open.c:884
do_last fs/namei.c:3455 [inline]
path_openat+0xb6b/0x2b70 fs/namei.c:3597
do_filp_open+0x219/0x280 fs/namei.c:3633
do_sys_open+0x2ca/0x590 fs/open.c:1077
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task blkid:26991 blocked for more than 140 seconds.
Not tainted 4.14.114+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D28824 26991 5961 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3498
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
__blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
blkdev_get+0x97/0x8b0 fs/block_dev.c:1612
blkdev_open+0x1cc/0x250 fs/block_dev.c:1770
do_dentry_open+0x44e/0xdf0 fs/open.c:770
vfs_open+0x105/0x230 fs/open.c:884
do_last fs/namei.c:3455 [inline]
path_openat+0xb6b/0x2b70 fs/namei.c:3597
do_filp_open+0x1a1/0x280 fs/namei.c:3631
do_sys_open+0x2ca/0x590 fs/open.c:1077
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task blkid:26993 blocked for more than 140 seconds.
Not tainted 4.14.114+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D27816 26993 24645 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3498
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
__blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
blkdev_get+0x97/0x8b0 fs/block_dev.c:1612
blkdev_open+0x1cc/0x250 fs/block_dev.c:1770
do_dentry_open+0x44e/0xdf0 fs/open.c:770
vfs_open+0x105/0x230 fs/open.c:884
do_last fs/namei.c:3455 [inline]
path_openat+0xb6b/0x2b70 fs/namei.c:3597
do_filp_open+0x1a1/0x280 fs/namei.c:3631
do_sys_open+0x2ca/0x590 fs/open.c:1077
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
Showing all locks held in the system:
1 lock held by khungtaskd/23:
#0: (tasklist_lock){.+.+}, at: [<0000000002f0ded9>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541
1 lock held by rsyslogd/1631:
#0: (&f->f_pos_lock){+.+.}, at: [<00000000bebbb155>] __fdget_pos+0xa6/0xc0 fs/file.c:769
2 locks held by getty/1759:
#0: (&tty->ldisc_sem){++++}, at: [<000000006badde2d>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000514b3c4a>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
3 locks held by syz-executor.4/26977:
#0: (&bdev->bd_mutex){+.+.}, at: [<0000000053e3c901>] __blkdev_put+0xb1/0x6d0 fs/block_dev.c:1778
#1: (loop_index_mutex){+.+.}, at: [<000000004512f2bb>] lo_release+0x19/0x190 drivers/block/loop.c:1667
#2: (loop_ctl_mutex#2){+.+.}, at: [<0000000091c22eea>] __lo_release drivers/block/loop.c:1644 [inline]
#2: (loop_ctl_mutex#2){+.+.}, at: [<0000000091c22eea>] lo_release+0x78/0x190 drivers/block/loop.c:1668
1 lock held by syz-executor.3/26974:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000008b2d2934>] blkdev_put+0x27/0x4c0 fs/block_dev.c:1814
2 locks held by syz-executor.1/26979:
#0: (&bdev->bd_mutex){+.+.}, at: [<0000000053e3c901>] __blkdev_put+0xb1/0x6d0 fs/block_dev.c:1778
#1: (loop_index_mutex){+.+.}, at: [<000000004512f2bb>] lo_release+0x19/0x190 drivers/block/loop.c:1667
2 locks held by syz-executor.5/26989:
#0: (loop_ctl_mutex/1){+.+.}, at: [<000000006e681668>] lo_ioctl+0x83/0x1970 drivers/block/loop.c:1405
#1: (&bdev->bd_mutex){+.+.}, at: [<00000000b2cf1e58>] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
2 locks held by syz-executor.5/26992:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000472b494d>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<00000000e4ee92ba>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
1 lock held by syz-executor.5/27032:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000472b494d>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
1 lock held by syz-executor.5/27033:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000472b494d>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
2 locks held by blkid/26988:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000472b494d>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<00000000e4ee92ba>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
1 lock held by blkid/26991:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000472b494d>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
1 lock held by blkid/26993:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000472b494d>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.114+ #63
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0xb9/0x10e lib/dump_stack.c:53
nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff89e4d6c2