INFO: task syz-executor.0:1847 blocked for more than 140 seconds.
Not tainted 4.14.113+ #61
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D24576 1847 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
blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
loop_reread_partitions+0x72/0x80 drivers/block/loop.c:615
loop_clr_fd+0x828/0xac0 drivers/block/loop.c:1069
lo_ioctl+0x813/0x1970 drivers/block/loop.c:1415
__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.5:1851 blocked for more than 140 seconds.
Not tainted 4.14.113+ #61
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D25640 1851 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 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.4:1855 blocked for more than 140 seconds.
Not tainted 4.14.113+ #61
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D25640 1855 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_open+0x19/0xb0 drivers/block/loop.c:1624
__blkdev_get+0x267/0xf90 fs/block_dev.c:1472
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:19402 blocked for more than 140 seconds.
Not tainted 4.14.113+ #61
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D28448 19402 10716 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:19403 blocked for more than 140 seconds.
Not tainted 4.14.113+ #61
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D29000 19403 11600 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
Showing all locks held in the system:
1 lock held by khungtaskd/23:
#0: (tasklist_lock){.+.+}, at: [<00000000464fb976>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544
2 locks held by getty/1757:
#0: (&tty->ldisc_sem){++++}, at: [<0000000076efd19c>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000038a8b635>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.0/1847:
#0: (loop_ctl_mutex/1){+.+.}, at: [<000000005618b2c4>] lo_ioctl+0x83/0x1970 drivers/block/loop.c:1405
#1: (&bdev->bd_mutex){+.+.}, at: [<0000000050230faf>] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
3 locks held by syz-executor.5/1851:
#0: (&bdev->bd_mutex){+.+.}, at: [<0000000022cc369b>] __blkdev_put+0xb1/0x6d0 fs/block_dev.c:1778
#1: (loop_index_mutex){+.+.}, at: [<00000000f60e347f>] lo_release+0x19/0x190 drivers/block/loop.c:1667
#2: (loop_ctl_mutex#2){+.+.}, at: [<000000006f6c4102>] __lo_release drivers/block/loop.c:1644 [inline]
#2: (loop_ctl_mutex#2){+.+.}, at: [<000000006f6c4102>] lo_release+0x78/0x190 drivers/block/loop.c:1668
2 locks held by syz-executor.4/1855:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000000b2b6f9e>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<000000001e5a7ece>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
1 lock held by blkid/19402:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000000b2b6f9e>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
2 locks held by blkid/19403:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000000b2b6f9e>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<000000001e5a7ece>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.113+ #61
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
CPU: 0 PID: 7338 Comm: syz-executor.3 Not tainted 4.14.113+ #61
task: 00000000d3f733bc task.stack: 00000000250ef8ab
RIP: 0010:__lock_acquire+0x322/0x3fa0 kernel/locking/lockdep.c:3431
RSP: 0000:ffff8881a13df970 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: ffff8881a13d0848 RSI: 0000000000000237 RDI: ffff8881a13d0840
RBP: ffff8881a13dfb28 R08: 0000000000000001 R09: 0000000000000000
R10: ffff8881a13d0830 R11: 0000000000000000 R12: ffff8881a13d0848
R13: 0000000000000237 R14: 0000000000000000 R15: ffff8881a13d0000
FS: 00007f30fc7e2700(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000058ace7c01c65 CR3: 00000001c4f50004 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
lock_acquire+0x10f/0x380 kernel/locking/lockdep.c:3994
__might_fault mm/memory.c:4578 [inline]
__might_fault+0x137/0x1b0 mm/memory.c:4563
__copy_to_user include/linux/uaccess.h:102 [inline]
save_xstate_epilog arch/x86/kernel/fpu/signal.c:89 [inline]
copy_fpstate_to_sigframe+0x2d2/0x6a0 arch/x86/kernel/fpu/signal.c:203
get_sigframe arch/x86/kernel/signal.c:284 [inline]
__setup_rt_frame arch/x86/kernel/signal.c:465 [inline]
setup_rt_frame arch/x86/kernel/signal.c:699 [inline]
handle_signal arch/x86/kernel/signal.c:743 [inline]
do_signal+0xefb/0x15c0 arch/x86/kernel/signal.c:811
exit_to_usermode_loop+0x11d/0x160 arch/x86/entry/common.c:159
prepare_exit_to_usermode+0x128/0x160 arch/x86/entry/common.c:198
retint_user+0x8/0x18
RIP: 0033:0x58ace7c01c65
RSP: 002b:00007f30fc7e1be0 EFLAGS: 00010287
RAX: 0000000000000001 RBX: 0000000000000009 RCX: 0000000000421310
RDX: 000058ace7c01c65 RSI: 0000000000000001 RDI: 00007f30fc7e2608
RBP: 000000000000000a R08: 00007f30fc7e1be0 R09: 000000000000000a
R10: 0000000000000008 R11: 0000000000000246 R12: 000000000000000b
R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff
Code: 42 08 48 b8 00 00 00 00 00 fc ff df 80 3c 02 00 0f 85 53 28 00 00 48 b8 00 00 00 00 00 fc ff df 4d 89 62 10 4d 8d 62 18 4c 89 e2 <48> c1 ea 03 80 3c 02 00 0f 85 6e 28 00 00 48 8b 84 24 88 00 00