INFO: task syz-executor.3:8458 blocked for more than 140 seconds.
Not tainted 4.14.106+ #30
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D27800 8458 8230 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
loop_control_ioctl+0x17e/0x2e0 drivers/block/loop.c:1996
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.3:8512 blocked for more than 140 seconds.
Not tainted 4.14.106+ #30
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D29048 8512 8230 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
loop_control_ioctl+0x71/0x2e0 drivers/block/loop.c:1982
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.2:8523 blocked for more than 140 seconds.
Not tainted 4.14.106+ #30
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D29248 8523 1857 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__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 blkid:8527 blocked for more than 140 seconds.
Not tainted 4.14.106+ #30
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D28808 8527 2801 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__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+0x41b/0xd60 fs/open.c:764
vfs_open+0x105/0x230 fs/open.c:878
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:1071
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: [<ffffffff87800fec>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541
2 locks held by getty/1760:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff88338a72>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff88333e97>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.3/8458:
#0: (loop_index_mutex){+.+.}, at: [<ffffffff883eb9e1>] loop_control_ioctl+0x71/0x2e0 drivers/block/loop.c:1982
#1: (loop_ctl_mutex#2){+.+.}, at: [<ffffffff883ebaee>] loop_control_ioctl+0x17e/0x2e0 drivers/block/loop.c:1996
1 lock held by syz-executor.3/8512:
#0: (loop_index_mutex){+.+.}, at: [<ffffffff883eb9e1>] loop_control_ioctl+0x71/0x2e0 drivers/block/loop.c:1982
2 locks held by syz-executor.2/8523:
#0: (loop_ctl_mutex/1){+.+.}, at: [<ffffffff883e8a93>] lo_ioctl+0x83/0x1970 drivers/block/loop.c:1405
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffff8811b89b>] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
2 locks held by blkid/8527:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff87c17183>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff883e3e89>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.106+ #30
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 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff88e445d2