INFO: task syz-executor.0:1841 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.0 D25160 1841 1 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_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
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:163
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.4:1846 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 D25600 1846 1 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_ioctl+0x83/0x1970 drivers/block/loop.c:1405
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x4d9/0x1810 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1881
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task syz-executor.2:30038 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.2 D28248 30038 23993 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+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
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x903/0x2960 kernel/exit.c:874
INFO: task syz-executor.2:1628 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.2 D29248 1628 23993 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.1:1620 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 D29168 1620 1832 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_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
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:163
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.1:1627 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 D29264 1627 1832 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+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:1619 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 D28808 1619 12599 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_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
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:163
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 blkid:1630 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 D29000 1630 31835 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:1665 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 D29136 1665 1662 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: [<00000000fbddfa07>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541
2 locks held by getty/1745:
#0: (&tty->ldisc_sem){++++}, at: [<0000000078223b6c>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000a22cc5a8>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.0/1841:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000f6b1dda8>] __blkdev_put+0xb1/0x6d0 fs/block_dev.c:1778
#1: (loop_index_mutex){+.+.}, at: [<00000000e8682844>] lo_release+0x19/0x190 drivers/block/loop.c:1667
1 lock held by syz-executor.4/1846:
#0: (loop_ctl_mutex/1){+.+.}, at: [<00000000c6b163db>] lo_ioctl+0x83/0x1970 drivers/block/loop.c:1405
2 locks held by syz-executor.2/30038:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000f6b1dda8>] __blkdev_put+0xb1/0x6d0 fs/block_dev.c:1778
#1: (loop_index_mutex){+.+.}, at: [<00000000e8682844>] lo_release+0x19/0x190 drivers/block/loop.c:1667
2 locks held by syz-executor.2/1628:
#0: (loop_ctl_mutex/1){+.+.}, at: [<00000000c6b163db>] lo_ioctl+0x83/0x1970 drivers/block/loop.c:1405
#1: (&bdev->bd_mutex){+.+.}, at: [<0000000056d0480e>] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
3 locks held by syz-executor.1/1620:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000f6b1dda8>] __blkdev_put+0xb1/0x6d0 fs/block_dev.c:1778
#1: (loop_index_mutex){+.+.}, at: [<00000000e8682844>] lo_release+0x19/0x190 drivers/block/loop.c:1667
#2: (loop_ctl_mutex#2){+.+.}, at: [<0000000042a518c1>] __lo_release drivers/block/loop.c:1644 [inline]
#2: (loop_ctl_mutex#2){+.+.}, at: [<0000000042a518c1>] lo_release+0x78/0x190 drivers/block/loop.c:1668
1 lock held by syz-executor.1/1627:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000008de589df>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
2 locks held by blkid/1619:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000f6b1dda8>] __blkdev_put+0xb1/0x6d0 fs/block_dev.c:1778
#1: (loop_index_mutex){+.+.}, at: [<00000000e8682844>] lo_release+0x19/0x190 drivers/block/loop.c:1667
1 lock held by blkid/1630:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000008de589df>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
1 lock held by blkid/1665:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000008de589df>] __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
CPU: 1 PID: 27521 Comm: syz-executor.4 Not tainted 4.14.114+ #63
task: 000000008d3ba897 task.stack: 0000000009c81c30
RIP: 0010:__read_once_size include/linux/compiler.h:186 [inline]
RIP: 0010:hlist_empty include/linux/list.h:641 [inline]
RIP: 0010:perf_trace_lock_acquire+0x39f/0x4e0 include/trace/events/lock.h:13
RSP: 0018:ffff8881d3b477c8 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffe8ffffd0e6b8 RCX: dffffc0000000000
RDX: 1ffffd1ffffa1cd7 RSI: 1ffffffff1cd8485 RDI: ffffffff8e6c2428
RBP: ffff8881d3b478a8 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff8c5f25b0 R12: ffffffff8e8c0060
R13: ffff8881d5682618 R14: ffff8881d3b47880 R15: 0000000000000000
FS: 00007f0ef6d2f700(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400300 CR3: 00000001d038e002 CR4: 00000000001606a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
trace_lock_acquire include/trace/events/lock.h:13 [inline]
lock_acquire+0x279/0x380 kernel/locking/lockdep.c:3990
Code: 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 0f 85 27 01 00 00 <48> 8b 85 50 ff ff ff 48 8b 00 48 85 c0 0f 85 ad fd ff ff eb 8f