INFO: task syz-executor1:10638 blocked for more than 140 seconds.
Not tainted 4.14.92+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1 D28904 10638 1858 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
loop_control_ioctl+0x183/0x300 drivers/block/loop.c:1965
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-executor0:10635 blocked for more than 140 seconds.
Not tainted 4.14.92+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0 D26912 10635 1844 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__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:614
loop_set_status+0xaa6/0xfb0 drivers/block/loop.c:1169
loop_set_status64+0xa5/0x100 drivers/block/loop.c:1287
lo_ioctl+0x3ce/0x17e0 drivers/block/loop.c:1400
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x4d9/0x1810 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1873
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 blkid:10640 blocked for more than 140 seconds.
Not tainted 4.14.92+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D27800 10640 295 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__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:1592
__blkdev_get+0x8e2/0xe50 fs/block_dev.c:1529
blkdev_get+0x97/0x8b0 fs/block_dev.c:1604
blkdev_open+0x1cc/0x250 fs/block_dev.c:1762
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: [<ffffffffa6bff9cc>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541
2 locks held by getty/1755:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffffa7737172>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffffa7732597>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
2 locks held by syz-executor1/10638:
#0: (loop_index_mutex){+.+.}, at: [<ffffffffa77e9811>] loop_control_ioctl+0x71/0x300 drivers/block/loop.c:1951
#1: (&lo->lo_ctl_mutex#2){+.+.}, at: [<ffffffffa77e9923>] loop_control_ioctl+0x183/0x300 drivers/block/loop.c:1965
2 locks held by syz-executor0/10635:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffffa77e6a37>] lo_ioctl+0x87/0x17e0 drivers/block/loop.c:1373
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffffa751a00b>] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
2 locks held by blkid/10640:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffffa70152f3>] __blkdev_get+0xf3/0xe50 fs/block_dev.c:1452
#1: (loop_index_mutex){+.+.}, at: [<ffffffffa77e20c9>] lo_open+0x19/0xb0 drivers/block/loop.c:1592
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.92+ #4
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 0xffffffffa824f812