NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
INFO: task syz-executor.3:11627 blocked for more than 140 seconds.
      Not tainted 4.14.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D27544 11627   6362 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3384
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
 loop_reread_partitions drivers/block/loop.c:624 [inline]
 loop_set_status+0xeeb/0x12b0 drivers/block/loop.c:1193
 loop_set_status64+0x92/0xe0 drivers/block/loop.c:1311
 lo_ioctl+0x587/0x1cd0 drivers/block/loop.c:1441
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x540/0x1830 block/ioctl.c:594
 block_ioctl+0xd9/0x120 fs/block_dev.c:1883
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45c237
RSP: 002b:00007fbdd1f2b9f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbdd1f2c6d4 RCX: 000000000045c237
RDX: 00007fbdd1f2bab0 RSI: 0000000000004c04 RDI: 0000000000000004
RBP: 0000000000000003 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000003
R13: 00007fbdd1f2c6d4 R14: 0000000000000004 R15: 000000000078bf0c
INFO: task syz-executor.3:11637 blocked for more than 140 seconds.
      Not tainted 4.14.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D28880 11637   6362 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3384
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 __blkdev_get+0x191/0x1090 fs/block_dev.c:1455
 blkdev_get+0x88/0x890 fs/block_dev.c:1611
 blkdev_open+0x1cc/0x250 fs/block_dev.c:1772
 do_dentry_open+0x44b/0xec0 fs/open.c:777
 vfs_open+0x105/0x220 fs/open.c:888
 do_last fs/namei.c:3428 [inline]
 path_openat+0x628/0x2970 fs/namei.c:3569
 do_filp_open+0x179/0x3c0 fs/namei.c:3603
 do_sys_open+0x296/0x410 fs/open.c:1081
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4160e1
RSP: 002b:00007fbdd1f0aa90 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fbdd1f0b6d4 RCX: 00000000004160e1
RDX: 00007fbdd1f0aafa RSI: 0000000000000002 RDI: 00007fbdd1f0aaf0
RBP: 0000000000000007 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000293 R12: 0000000000000007
R13: 00007fbdd1f0b6d4 R14: 00007fbdd1f0b9c0 R15: 000000000078bfac
INFO: task systemd-udevd:11631 blocked for more than 140 seconds.
      Not tainted 4.14.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
systemd-udevd   D28464 11631   3650 0x00000104
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3384
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 lo_open+0x19/0xb0 drivers/block/loop.c:1634
 __blkdev_get+0xa8c/0x1090 fs/block_dev.c:1537
 blkdev_get+0x88/0x890 fs/block_dev.c:1611
 blkdev_open+0x1cc/0x250 fs/block_dev.c:1772
 do_dentry_open+0x44b/0xec0 fs/open.c:777
 vfs_open+0x105/0x220 fs/open.c:888
 do_last fs/namei.c:3428 [inline]
 path_openat+0x628/0x2970 fs/namei.c:3569
 do_filp_open+0x179/0x3c0 fs/namei.c:3603
 do_sys_open+0x296/0x410 fs/open.c:1081
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7fda899f3840
RSP: 002b:00007ffc830f9448 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000557d221bb9e0 RCX: 00007fda899f3840
RDX: 0000557d204fdfe3 RSI: 00000000000a0800 RDI: 0000557d221ce370
RBP: 00007ffc830f95c0 R08: 0000557d204fd670 R09: 0000000000000010
R10: 0000557d204fdd0c R11: 0000000000000246 R12: 00007ffc830f9510
R13: 0000557d221ba970 R14: 0000000000000003 R15: 000000000000000e
INFO: task syz-executor.2:11638 blocked for more than 140 seconds.
      Not tainted 4.14.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D28864 11638   6363 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3384
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 loop_control_ioctl+0x181/0x3f0 drivers/block/loop.c:2007
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45c369
RSP: 002b:00007f041a092c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000011600 RCX: 000000000045c369
RDX: 0000000000000003 RSI: 0000000000004c81 RDI: 0000000000000007
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffc3645fedf R14: 00007f041a0939c0 R15: 000000000078bf0c

Showing all locks held in the system:
1 lock held by khungtaskd/1061:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff81477894>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
2 locks held by syz-executor.3/11627:
 #0:  (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff83a816d7>] lo_ioctl+0x87/0x1cd0 drivers/block/loop.c:1414
 #1:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff82f71d0b>] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
1 lock held by syz-executor.3/11637:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a4fb1>] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455
2 locks held by systemd-udevd/11631:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a4fb1>] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455
 #1:  (loop_index_mutex){+.+.}, at: [<ffffffff83a78599>] lo_open+0x19/0xb0 drivers/block/loop.c:1634
2 locks held by syz-executor.2/11638:
 #0:  (loop_index_mutex){+.+.}, at: [<ffffffff83a7e787>] loop_control_ioctl+0x67/0x3f0 drivers/block/loop.c:1993
 #1:  (&lo->lo_ctl_mutex){+.+.}, at: [<ffffffff83a7e8a1>] loop_control_ioctl+0x181/0x3f0 drivers/block/loop.c:2007

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

NMI backtrace for cpu 1
CPU: 1 PID: 1061 Comm: khungtaskd Not tainted 4.14.189-syzkaller #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+0x1b2/0x283 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x13a/0x17f lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
 watchdog+0x5b9/0xb40 kernel/hung_task.c:274
 kthread+0x30d/0x420 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
CPU: 0 PID: 3643 Comm: systemd-journal Not tainted 4.14.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888093c76100 task.stack: ffff888093c78000
RIP: 0010:___bpf_prog_run+0x1e66/0x5a70 kernel/bpf/core.c:1140
RSP: 0018:ffff888093c7fa48 EFLAGS: 00000246
RAX: 1ffff1101278ff6b RBX: dffffc0000000000 RCX: ffff888093c7fe68
RDX: 0000000000000001 RSI: ffffc900018e0030 RDI: ffffc900018e0051
RBP: ffff888093c7fb58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff86af31e0
R13: 1ffff1101278ff50 R14: ffffc900018e0050 R15: ffff888093c7fb58
FS:  00007fd162d448c0(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd160211020 CR3: 0000000093d56000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Code: 83 e2 07 0f b6 04 18 38 d0 7f 08 84 c0 0f 85 e7 27 00 00 41 0f b6 46 01 83 e0 0f 4c 8d 7c c5 00 4c 89 f8 48 c1 e8 03 80 3c 18 00 <0f> 85 01 32 00 00 49 8d 7e 04 4d 8b 3f 48 89 f8 48 c1 e8 03 0f