INFO: task blkid:9577 blocked for more than 140 seconds.
      Not tainted 4.14.152 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid           D29040  9577   7037 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x96b/0x1860 block/ioctl.c:594
 block_ioctl+0xde/0x120 fs/block_dev.c:1881
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7fe774f04347
RSP: 002b:00007ffe7c7e5458 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000ef1030 RCX: 00007fe774f04347
RDX: 0000000000000000 RSI: 0000000000005331 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007fe7751b45a0 R09: 0000000000000008
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000005
INFO: task syz-executor.4:9581 blocked for more than 140 seconds.
      Not tainted 4.14.152 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28688  9581   6894 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1f6/0x390 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x49/0xb0 kernel/locking/rwsem.c:26
 __get_super.part.0+0x1cb/0x280 fs/super.c:678
 __get_super include/linux/spinlock.h:317 [inline]
 get_super+0x2e/0x50 fs/super.c:707
 fsync_bdev+0x19/0xd0 fs/block_dev.c:495
 invalidate_partition+0x36/0x60 block/genhd.c:1506
 drop_partitions block/partition-generic.c:442 [inline]
 rescan_partitions+0xe3/0x860 block/partition-generic.c:515
 __blkdev_reread_part+0x15c/0x1e0 block/ioctl.c:173
 blkdev_reread_part+0x27/0x40 block/ioctl.c:193
 loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:614
 loop_set_status+0xc25/0x11f0 drivers/block/loop.c:1183
 loop_set_status64+0xa6/0xf0 drivers/block/loop.c:1301
 lo_ioctl+0x5c1/0x1ce0 drivers/block/loop.c:1431
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x96b/0x1860 block/ioctl.c:594
 block_ioctl+0xde/0x120 fs/block_dev.c:1881
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a087
RSP: 002b:00007f124423c9f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f124423d6d4 RCX: 000000000045a087
RDX: 00007f124423cab0 RSI: 0000000000004c04 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000003 R14: 0000000000000004 R15: 00000000ffffffff
INFO: task syz-executor.4:9591 blocked for more than 140 seconds.
      Not tainted 4.14.152 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28768  9591   6894 0x80000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x96b/0x1860 block/ioctl.c:594
 ioctl_by_bdev+0xa5/0x110 fs/block_dev.c:2066
 udf_get_last_session+0x87/0xe0 fs/udf/lowlevel.c:37
 udf_fill_super+0x114d/0x157f fs/udf/super.c:2146
 mount_bdev+0x2be/0x370 fs/super.c:1134
 udf_mount+0x35/0x40 fs/udf/super.c:132
 mount_fs+0x97/0x2a1 fs/super.c:1237
 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x417/0x27d0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3072
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a219
RSP: 002b:00007f124421bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a219
RDX: 0000000020000200 RSI: 0000000020000180 RDI: 0000000020000140
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f124421c6d4
R13: 00000000004c6d95 R14: 00000000004dc508 R15: 00000000ffffffff
INFO: task syz-executor.4:9631 blocked for more than 140 seconds.
      Not tainted 4.14.152 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D29184  9631   6894 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
 blkdev_get+0xa8/0x8e0 fs/block_dev.c:1612
 blkdev_open+0x1d1/0x260 fs/block_dev.c:1770
 do_dentry_open+0x73b/0xeb0 fs/open.c:777
 vfs_open+0x105/0x220 fs/open.c:891
 do_last fs/namei.c:3425 [inline]
 path_openat+0x8bd/0x3f70 fs/namei.c:3566
 do_filp_open+0x18e/0x250 fs/namei.c:3600
 do_sys_open+0x2c5/0x430 fs/open.c:1084
 SYSC_open fs/open.c:1102 [inline]
 SyS_open+0x2d/0x40 fs/open.c:1097
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x413fb1
RSP: 002b:00007f12441fa9f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f12441fb6d4 RCX: 0000000000413fb1
RDX: 00007f12441fabaa RSI: 0000000000000002 RDI: 00007f12441faba0
RBP: 000000000075c070 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000003 R14: 00000000004e1de8 R15: 00000000ffffffff
INFO: task syz-executor.4:9633 blocked for more than 140 seconds.
      Not tainted 4.14.152 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D29704  9633   6894 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
 blkdev_get+0x43f/0x8e0 fs/block_dev.c:1612
 blkdev_get_by_path+0x94/0xf0 fs/block_dev.c:1690
 mount_bdev+0x50/0x370 fs/super.c:1092
 udf_mount+0x35/0x40 fs/udf/super.c:132
 mount_fs+0x97/0x2a1 fs/super.c:1237
 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x417/0x27d0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3072
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a219
RSP: 002b:00007f12441b8c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a219
RDX: 0000000020000200 RSI: 0000000020000180 RDI: 0000000020000140
RBP: 000000000075c1c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f12441b96d4
R13: 00000000004c6d95 R14: 00000000004dc508 R15: 00000000ffffffff
INFO: task syz-executor.0:9588 blocked for more than 140 seconds.
      Not tainted 4.14.152 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29200  9588   6891 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1f6/0x390 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x49/0xb0 kernel/locking/rwsem.c:26
 __get_super.part.0+0x1cb/0x280 fs/super.c:678
 __get_super include/linux/spinlock.h:317 [inline]
 get_super+0x2e/0x50 fs/super.c:707
 fsync_bdev+0x19/0xd0 fs/block_dev.c:495
 invalidate_partition+0x36/0x60 block/genhd.c:1506
 drop_partitions block/partition-generic.c:442 [inline]
 rescan_partitions+0xe3/0x860 block/partition-generic.c:515
 __blkdev_reread_part+0x15c/0x1e0 block/ioctl.c:173
 blkdev_reread_part+0x27/0x40 block/ioctl.c:193
 loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:614
 loop_set_status+0xc25/0x11f0 drivers/block/loop.c:1183
 loop_set_status64+0xa6/0xf0 drivers/block/loop.c:1301
 lo_ioctl+0x5c1/0x1ce0 drivers/block/loop.c:1431
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x96b/0x1860 block/ioctl.c:594
 block_ioctl+0xde/0x120 fs/block_dev.c:1881
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a087
RSP: 002b:00007f62441a49f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f62441a56d4 RCX: 000000000045a087
RDX: 00007f62441a4ab0 RSI: 0000000000004c04 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000003 R14: 0000000000000004 R15: 00000000ffffffff
INFO: task syz-executor.0:9599 blocked for more than 140 seconds.
      Not tainted 4.14.152 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D28768  9599   6891 0x80000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x96b/0x1860 block/ioctl.c:594
 ioctl_by_bdev+0xa5/0x110 fs/block_dev.c:2066
 udf_get_last_session+0x87/0xe0 fs/udf/lowlevel.c:37
 udf_fill_super+0x114d/0x157f fs/udf/super.c:2146
 mount_bdev+0x2be/0x370 fs/super.c:1134
 udf_mount+0x35/0x40 fs/udf/super.c:132
 mount_fs+0x97/0x2a1 fs/super.c:1237
 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x417/0x27d0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3072
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a219
RSP: 002b:00007f6244183c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a219
RDX: 0000000020000200 RSI: 0000000020000180 RDI: 0000000020000140
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f62441846d4
R13: 00000000004c6d95 R14: 00000000004dc508 R15: 00000000ffffffff
INFO: task syz-executor.0:9634 blocked for more than 140 seconds.
      Not tainted 4.14.152 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29184  9634   6891 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
 blkdev_get+0xa8/0x8e0 fs/block_dev.c:1612
 blkdev_open+0x1d1/0x260 fs/block_dev.c:1770
 do_dentry_open+0x73b/0xeb0 fs/open.c:777
 vfs_open+0x105/0x220 fs/open.c:891
 do_last fs/namei.c:3425 [inline]
 path_openat+0x8bd/0x3f70 fs/namei.c:3566
 do_filp_open+0x18e/0x250 fs/namei.c:3600
 do_sys_open+0x2c5/0x430 fs/open.c:1084
 SYSC_open fs/open.c:1102 [inline]
 SyS_open+0x2d/0x40 fs/open.c:1097
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x413fb1
RSP: 002b:00007f62441629f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f62441636d4 RCX: 0000000000413fb1
RDX: 00007f6244162baa RSI: 0000000000000002 RDI: 00007f6244162ba0
RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000003 R14: 00007f62441636d4 R15: 00000000ffffffff
INFO: task syz-executor.0:9636 blocked for more than 140 seconds.
      Not tainted 4.14.152 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29704  9636   6891 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
 blkdev_get+0x43f/0x8e0 fs/block_dev.c:1612
 blkdev_get_by_path+0x94/0xf0 fs/block_dev.c:1690
 mount_bdev+0x50/0x370 fs/super.c:1092
 udf_mount+0x35/0x40 fs/udf/super.c:132
 mount_fs+0x97/0x2a1 fs/super.c:1237
 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x417/0x27d0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3072
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a219
RSP: 002b:00007f6244120c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a219
RDX: 0000000020000200 RSI: 0000000020000180 RDI: 0000000020000140
RBP: 000000000075c1c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f62441216d4
R13: 00000000004c6d95 R14: 00000000004dc508 R15: 00000000ffffffff
INFO: task blkid:9596 blocked for more than 140 seconds.
      Not tainted 4.14.152 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid           D29040  9596   6851 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x96b/0x1860 block/ioctl.c:594
 block_ioctl+0xde/0x120 fs/block_dev.c:1881
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f2d5df98347
RSP: 002b:00007fffcfd58e18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000764030 RCX: 00007f2d5df98347
RDX: 0000000000000000 RSI: 0000000000005331 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007f2d5e2485a0 R09: 0000000000000008
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000200 R14: 0000000000000003 R15: 0000000000000005

Showing all locks held in the system:
1 lock held by khungtaskd/1015:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff814875a8>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4544
1 lock held by rsyslogd/6722:
 #0:  (&f->f_pos_lock){+.+.}, at: [<ffffffff8194526b>] __fdget_pos+0xab/0xd0 fs/file.c:769
2 locks held by getty/6844:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861c4153>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310f506>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6845:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861c4153>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310f506>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6846:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861c4153>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310f506>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6847:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861c4153>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310f506>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6848:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861c4153>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310f506>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6849:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861c4153>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310f506>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6850:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861c4153>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310f506>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
1 lock held by blkid/9577:
 #0:  (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff83732e4f>] lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
3 locks held by syz-executor.4/9581:
 #0:  (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff83732e4f>] lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
 #1:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff82cad8af>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:192
 #2:  (&type->s_umount_key#58){.+.+}, at: [<ffffffff818e17eb>] __get_super.part.0+0x1cb/0x280 fs/super.c:678
2 locks held by syz-executor.4/9591:
 #0:  (&type->s_umount_key#57/1){+.+.}, at: [<ffffffff818e23d1>] alloc_super fs/super.c:251 [inline]
 #0:  (&type->s_umount_key#57/1){+.+.}, at: [<ffffffff818e23d1>] sget_userns+0x551/0xc30 fs/super.c:516
 #1:  (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff83732e4f>] lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
1 lock held by syz-executor.4/9631:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a9355>] __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
1 lock held by syz-executor.4/9633:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a9355>] __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
3 locks held by syz-executor.0/9588:
 #0:  (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff83732e4f>] lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
 #1:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff82cad8af>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:192
 #2:  (&type->s_umount_key#58){.+.+}, at: [<ffffffff818e17eb>] __get_super.part.0+0x1cb/0x280 fs/super.c:678
2 locks held by syz-executor.0/9599:
 #0:  (&type->s_umount_key#57/1){+.+.}, at: [<ffffffff818e23d1>] alloc_super fs/super.c:251 [inline]
 #0:  (&type->s_umount_key#57/1){+.+.}, at: [<ffffffff818e23d1>] sget_userns+0x551/0xc30 fs/super.c:516
 #1:  (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff83732e4f>] lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
1 lock held by syz-executor.0/9634:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a9355>] __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
1 lock held by syz-executor.0/9636:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a9355>] __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
1 lock held by blkid/9596:
 #0:  (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff83732e4f>] lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1015 Comm: khungtaskd Not tainted 4.14.152 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x197 lib/dump_stack.c:53
 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
 watchdog+0x5e7/0xb90 kernel/hung_task.c:274
 kthread+0x319/0x430 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff861c4c3e