INFO: task syz-executor.5:7099 blocked for more than 140 seconds.
      Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D24824  7099      1 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7be/0x1cf0 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_release drivers/block/loop.c:1644 [inline]
 lo_release+0x84/0x1b0 drivers/block/loop.c:1668
 __blkdev_put+0x436/0x7f0 fs/block_dev.c:1791
 blkdev_put+0x88/0x510 fs/block_dev.c:1856
 blkdev_close+0x8b/0xb0 fs/block_dev.c:1863
 __fput+0x277/0x7a0 fs/file_table.c:210
 ____fput+0x16/0x20 fs/file_table.c:244
 task_work_run+0x119/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1da/0x220 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+0x4a9/0x630 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x412b40
RSP: 002b:00007ffd3a556938 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000412b40
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 00000000000000cd R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd3a556970 R14: 000000000003e93b R15: 00007ffd3a556980
INFO: task syz-executor.0:7100 blocked for more than 140 seconds.
      Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D24992  7100      1 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7be/0x1cf0 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_open+0x1d/0xb0 drivers/block/loop.c:1624
 __blkdev_get+0xab1/0x1120 fs/block_dev.c:1537
 blkdev_get+0xa8/0x8e0 fs/block_dev.c:1612
 blkdev_open+0x1d1/0x260 fs/block_dev.c:1770
 do_dentry_open+0x73e/0xeb0 fs/open.c:758
 vfs_open+0x105/0x230 fs/open.c:872
 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:1065
 SYSC_open fs/open.c:1083 [inline]
 SyS_open+0x2d/0x40 fs/open.c:1078
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x412d20
RSP: 002b:00007ffeb3c7a2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000003eb2e RCX: 0000000000412d20
RDX: 00007ffeb3c7a38a RSI: 0000000000000002 RDI: 00007ffeb3c7a380
RBP: 00000000000000c6 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffeb3c7a330 R14: 000000000003e7f9 R15: 00007ffeb3c7a340
INFO: task syz-executor.2:7101 blocked for more than 140 seconds.
      Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D24992  7101      1 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7be/0x1cf0 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_open+0x1d/0xb0 drivers/block/loop.c:1624
 __blkdev_get+0x2c9/0x1120 fs/block_dev.c:1472
 blkdev_get+0xa8/0x8e0 fs/block_dev.c:1612
 blkdev_open+0x1d1/0x260 fs/block_dev.c:1770
 do_dentry_open+0x73e/0xeb0 fs/open.c:758
 vfs_open+0x105/0x230 fs/open.c:872
 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:1065
 SYSC_open fs/open.c:1083 [inline]
 SyS_open+0x2d/0x40 fs/open.c:1078
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x412d20
RSP: 002b:00007ffdd221f4e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000003eb46 RCX: 0000000000412d20
RDX: 00007ffdd221f57a RSI: 0000000000000002 RDI: 00007ffdd221f570
RBP: 00000000000000ba R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdd221f520 R14: 000000000003e7fa R15: 00007ffdd221f530
INFO: task syz-executor.3:7103 blocked for more than 140 seconds.
      Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D24832  7103      1 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7be/0x1cf0 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_open+0x1d/0xb0 drivers/block/loop.c:1624
 __blkdev_get+0x2c9/0x1120 fs/block_dev.c:1472
 blkdev_get+0xa8/0x8e0 fs/block_dev.c:1612
 blkdev_open+0x1d1/0x260 fs/block_dev.c:1770
 do_dentry_open+0x73e/0xeb0 fs/open.c:758
 vfs_open+0x105/0x230 fs/open.c:872
 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:1065
 SYSC_open fs/open.c:1083 [inline]
 SyS_open+0x2d/0x40 fs/open.c:1078
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x412d20
RSP: 002b:00007ffc94775878 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000003e7b2 RCX: 0000000000412d20
RDX: 00007ffc9477590a RSI: 0000000000000002 RDI: 00007ffc94775900
RBP: 000000000000005b R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc947758b0 R14: 000000000003e48b R15: 00007ffc947758c0
INFO: task syz-executor.4:7104 blocked for more than 140 seconds.
      Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D24992  7104      1 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7be/0x1cf0 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+0x87/0x1c70 drivers/block/loop.c:1405
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x983/0x1880 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+0x7b9/0x1070 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458c17
RSP: 002b:00007ffca5608c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c17
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 0000000000000088 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffca5608cd0 R14: 000000000003e93a R15: 00007ffca5608ce0
INFO: task syz-executor.1:8944 blocked for more than 140 seconds.
      Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D29120  8944   7102 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7be/0x1cf0 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_reread_part+0x1f/0x40 block/ioctl.c:192
 loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:615
 loop_set_status+0xc28/0x1200 drivers/block/loop.c:1184
 loop_set_status64+0xa6/0xf0 drivers/block/loop.c:1302
 lo_ioctl+0x5c1/0x1c70 drivers/block/loop.c:1432
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x983/0x1880 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+0x7b9/0x1070 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458c17
RSP: 002b:00007f4bad8a09f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4bad8a16d4 RCX: 0000000000458c17
RDX: 00007f4bad8a0ab0 RSI: 0000000000004c04 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000003 R14: 0000000000000004 R15: 00000000ffffffff
INFO: task blkid:8941 blocked for more than 140 seconds.
      Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid           D29040  8941   7062 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7be/0x1cf0 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+0x87/0x1c70 drivers/block/loop.c:1405
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x983/0x1880 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+0x7b9/0x1070 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f52df0d7347
RSP: 002b:00007ffd50326a38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000632030 RCX: 00007f52df0d7347
RDX: 0000000000000000 RSI: 0000000000005331 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007f52df3875a0 R09: 0000000000000008
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000005
INFO: task blkid:8942 blocked for more than 140 seconds.
      Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid           D29040  8942   7260 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7be/0x1cf0 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_open+0x1d/0xb0 drivers/block/loop.c:1624
 __blkdev_get+0xab1/0x1120 fs/block_dev.c:1537
 blkdev_get+0xa8/0x8e0 fs/block_dev.c:1612
 blkdev_open+0x1d1/0x260 fs/block_dev.c:1770
 do_dentry_open+0x73e/0xeb0 fs/open.c:758
 vfs_open+0x105/0x230 fs/open.c:872
 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:1065
 SYSC_open fs/open.c:1083 [inline]
 SyS_open+0x2d/0x40 fs/open.c:1078
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f37f69b5120
RSP: 002b:00007ffd45992908 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f37f69b5120
RDX: 00007ffd45993f34 RSI: 0000000000000000 RDI: 00007ffd45993f34
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001f16030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
INFO: task blkid:8943 blocked for more than 140 seconds.
      Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid           D28808  8943   7063 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7be/0x1cf0 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_open+0x1d/0xb0 drivers/block/loop.c:1624
 __blkdev_get+0xab1/0x1120 fs/block_dev.c:1537
 blkdev_get+0xa8/0x8e0 fs/block_dev.c:1612
 blkdev_open+0x1d1/0x260 fs/block_dev.c:1770
 do_dentry_open+0x73e/0xeb0 fs/open.c:758
 vfs_open+0x105/0x230 fs/open.c:872
 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:1065
 SYSC_open fs/open.c:1083 [inline]
 SyS_open+0x2d/0x40 fs/open.c:1078
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f69b68d9120
RSP: 002b:00007ffde36ba2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f69b68d9120
RDX: 00007ffde36bbf34 RSI: 0000000000000000 RDI: 00007ffde36bbf34
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002189030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
INFO: task blkid:8946 blocked for more than 140 seconds.
      Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid           D29040  8946   7268 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7be/0x1cf0 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+0x73e/0xeb0 fs/open.c:758
 vfs_open+0x105/0x230 fs/open.c:872
 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:1065
 SYSC_open fs/open.c:1083 [inline]
 SyS_open+0x2d/0x40 fs/open.c:1078
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f70e3436120
RSP: 002b:00007fff0166fd08 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f70e3436120
RDX: 00007fff01670f34 RSI: 0000000000000000 RDI: 00007fff01670f34
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000d38030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005

Showing all locks held in the system:
1 lock held by khungtaskd/1008:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff81487148>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4541
2 locks held by getty/7055:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7056:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7057:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7058:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7059:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7060:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7061:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
3 locks held by syz-executor.5/7099:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a7b16>] __blkdev_put+0xa6/0x7f0 fs/block_dev.c:1778
 #1:  (loop_index_mutex){+.+.}, at: [<ffffffff8373bf4e>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1667
 #2:  (loop_ctl_mutex#2){+.+.}, at: [<ffffffff8373bfb4>] __lo_release drivers/block/loop.c:1644 [inline]
 #2:  (loop_ctl_mutex#2){+.+.}, at: [<ffffffff8373bfb4>] lo_release+0x84/0x1b0 drivers/block/loop.c:1668
2 locks held by syz-executor.0/7100:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a83a5>] __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
 #1:  (loop_index_mutex){+.+.}, at: [<ffffffff8373739d>] lo_open+0x1d/0xb0 drivers/block/loop.c:1624
2 locks held by syz-executor.2/7101:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a83a5>] __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
 #1:  (loop_index_mutex){+.+.}, at: [<ffffffff8373739d>] lo_open+0x1d/0xb0 drivers/block/loop.c:1624
2 locks held by syz-executor.3/7103:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a83a5>] __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
 #1:  (loop_index_mutex){+.+.}, at: [<ffffffff8373739d>] lo_open+0x1d/0xb0 drivers/block/loop.c:1624
1 lock held by syz-executor.4/7104:
 #0:  (loop_ctl_mutex/1){+.+.}, at: [<ffffffff8373dc27>] lo_ioctl+0x87/0x1c70 drivers/block/loop.c:1405
2 locks held by syz-executor.1/8944:
 #0:  (loop_ctl_mutex/1){+.+.}, at: [<ffffffff8373dc27>] lo_ioctl+0x87/0x1c70 drivers/block/loop.c:1405
 #1:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff82cab2af>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:192
1 lock held by blkid/8941:
 #0:  (loop_ctl_mutex/1){+.+.}, at: [<ffffffff8373dc27>] lo_ioctl+0x87/0x1c70 drivers/block/loop.c:1405
2 locks held by blkid/8942:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a83a5>] __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
 #1:  (loop_index_mutex){+.+.}, at: [<ffffffff8373739d>] lo_open+0x1d/0xb0 drivers/block/loop.c:1624
2 locks held by blkid/8943:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a83a5>] __blkdev_get+0x145/0x1120 fs/block_dev.c:1457
 #1:  (loop_index_mutex){+.+.}, at: [<ffffffff8373739d>] lo_open+0x1d/0xb0 drivers/block/loop.c:1624
1 lock held by blkid/8946:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a83a5>] __blkdev_get+0x145/0x1120 fs/block_dev.c:1457

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

NMI backtrace for cpu 0
CPU: 0 PID: 1008 Comm: khungtaskd Not tainted 4.14.114 #4
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+0x138/0x19c 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+0x31c/0x430 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7603 Comm: syz-executor.2 Not tainted 4.14.114 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888058b38380 task.stack: ffff888058f20000
RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:164 [inline]
RIP: 0010:lock_acquire+0x15e/0x430 kernel/locking/lockdep.c:3992
RSP: 0018:ffff888058f27e00 EFLAGS: 00000086
RAX: 0000000000000000 RBX: ffff888058b38380 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8778ef60
RBP: ffff888058f27e68 R08: 0000000000000000 R09: 0000000000000282
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8778ef60
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
FS:  00007f3ce7bdc700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009532e000 CR4: 00000000001406e0
Call Trace:
 rcu_lock_acquire include/linux/rcupdate.h:244 [inline]
 rcu_read_lock include/linux/rcupdate.h:631 [inline]
 SYSC_ioprio_get block/ioprio.c:220 [inline]
 SyS_ioprio_get+0x4f7/0xa00 block/ioprio.c:175
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x20000553
RSP: 002b:00007f3ce7bdbbd8 EFLAGS: 00000297 ORIG_RAX: 00000000000000fc
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000020000553
RDX: 74dcc826bd53a815 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000000000c6 R08: 0000000000000005 R09: 0000000000000006
R10: 0000000000000007 R11: 0000000000000297 R12: 000000000000000b
R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff
Code: 48 0f a3 05 65 9e dc 06 0f 82 c1 01 00 00 4c 8b 4d c8 44 89 f2 6a 00 4c 89 e7 6a 00 45 89 d8 44 89 f9 44 89 ee ff 75 10 ff 75 d0 <49> c1 e9 09 49 83 f1 01 41 83 e1 01 e8 31 9e ff ff 48 b8 00 00