syzbot


INFO: task hung in __blkdev_get

Status: auto-closed as invalid on 2020/02/28 16:13
Reported-by: syzbot+29067ccee0d84204a7e9@syzkaller.appspotmail.com
First crash: 2000d, last: 1543d
Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-49 INFO: task hung in __blkdev_get C 1504 1543d 1775d 0/3 public: reported C repro on 2019/04/12 00:00
android-44 INFO: task hung in __blkdev_get syz 521 1545d 1773d 0/2 public: reported syz repro on 2019/04/14 00:02
upstream INFO: task hung in __blkdev_get (3) fs 1 1769d 1769d 0/26 closed as invalid on 2019/05/08 13:05
upstream INFO: task hung in __blkdev_get (2) udf 11 1867d 1991d 0/26 closed as dup on 2018/09/08 15:48
linux-4.14 INFO: task hung in __blkdev_get ntfs vfs C 741 365d 1776d 0/1 upstream: reported C repro on 2019/04/11 13:17
upstream INFO: task hung in __blkdev_get fs C 662 2138d 2264d 5/26 fixed on 2018/05/08 18:30
linux-4.19 INFO: task hung in __blkdev_get vfs ntfs C error 144 358d 1652d 0/1 upstream: reported C repro on 2019/08/13 00:10
upstream INFO: task hung in __blkdev_get (4) fs 1 1587d 1587d 0/26 auto-closed as invalid on 2020/01/15 05:33
upstream INFO: task hung in __blkdev_get (5) fs 8 1166d 1380d 0/26 auto-closed as invalid on 2021/03/11 14:46

Sample crash report:
INFO: task syz-executor.5:1839 blocked for more than 140 seconds.
      Not tainted 4.14.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D24560  1839      1 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 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/0xe20 fs/open.c:789
 vfs_open+0x105/0x230 fs/open.c:903
 do_last fs/namei.c:3539 [inline]
 path_openat+0xb6c/0x2be0 fs/namei.c:3681
 do_filp_open+0x1a1/0x280 fs/namei.c:3715
 do_sys_open+0x2ca/0x590 fs/open.c:1096
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4143f0
RSP: 002b:00007fffa8006c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000002e76e RCX: 00000000004143f0
RDX: 00007fffa8006d2a RSI: 0000000000000002 RDI: 00007fffa8006d20
RBP: 00000000000001d3 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffa8006cd0 R14: 000000000002e6d4 R15: 00007fffa8006ce0
INFO: task syz-executor.3:8340 blocked for more than 140 seconds.
      Not tainted 4.14.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D25312  8340      1 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 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/0xe20 fs/open.c:789
 vfs_open+0x105/0x230 fs/open.c:903
 do_last fs/namei.c:3539 [inline]
 path_openat+0xb6c/0x2be0 fs/namei.c:3681
 do_filp_open+0x1a1/0x280 fs/namei.c:3715
 do_sys_open+0x2ca/0x590 fs/open.c:1096
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4143f0
RSP: 002b:00007ffc10b9b868 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000002e772 RCX: 00000000004143f0
RDX: 00007ffc10b9b8fa RSI: 0000000000000002 RDI: 00007ffc10b9b8f0
RBP: 000000000000003c R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc10b9b8a0 R14: 000000000002e708 R15: 00007ffc10b9b8b0
INFO: task syz-executor.1:8350 blocked for more than 140 seconds.
      Not tainted 4.14.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D25312  8350      1 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 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/0xe20 fs/open.c:789
 vfs_open+0x105/0x230 fs/open.c:903
 do_last fs/namei.c:3539 [inline]
 path_openat+0xb6c/0x2be0 fs/namei.c:3681
 do_filp_open+0x1a1/0x280 fs/namei.c:3715
 do_sys_open+0x2ca/0x590 fs/open.c:1096
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4143f0
RSP: 002b:00007ffcd7ee3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000002ea17 RCX: 00000000004143f0
RDX: 00007ffcd7ee30ba RSI: 0000000000000002 RDI: 00007ffcd7ee30b0
RBP: 0000000000000033 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcd7ee3060 R14: 000000000002e6ed R15: 00007ffcd7ee3070
INFO: task syz-executor.4:8892 blocked for more than 140 seconds.
      Not tainted 4.14.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D25312  8892      1 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 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/0xe20 fs/open.c:789
 vfs_open+0x105/0x230 fs/open.c:903
 do_last fs/namei.c:3539 [inline]
 path_openat+0xb6c/0x2be0 fs/namei.c:3681
 do_filp_open+0x1a1/0x280 fs/namei.c:3715
 do_sys_open+0x2ca/0x590 fs/open.c:1096
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4143f0
RSP: 002b:00007ffc5df64ac8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000002e76d RCX: 00000000004143f0
RDX: 00007ffc5df64b5a RSI: 0000000000000002 RDI: 00007ffc5df64b50
RBP: 0000000000000039 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc5df64b00 R14: 000000000002e6ca R15: 00007ffc5df64b10
INFO: task syz-executor.0:10095 blocked for more than 140 seconds.
      Not tainted 4.14.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D28096 10095   9556 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893
 blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
 loop_reread_partitions+0x7f/0x90 drivers/block/loop.c:614
 loop_set_status+0xbff/0x11f0 drivers/block/loop.c:1183
 loop_set_status64+0xa5/0x100 drivers/block/loop.c:1301
 lo_ioctl+0xd1/0x1a30 drivers/block/loop.c:1431
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x8d0/0x1870 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/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a4e7
RSP: 002b:00007f7125a299f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7125a2a6d4 RCX: 000000000045a4e7
RDX: 00007f7125a29ab0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000004
R13: 0000000000000004 R14: 0000000000000005 R15: 00000000ffffffff
INFO: task syz-executor.0:10106 blocked for more than 140 seconds.
      Not tainted 4.14.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29104 10106   9556 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 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/0xe20 fs/open.c:789
 vfs_open+0x105/0x230 fs/open.c:903
 do_last fs/namei.c:3539 [inline]
 path_openat+0xb6c/0x2be0 fs/namei.c:3681
 do_filp_open+0x1a1/0x280 fs/namei.c:3715
 do_sys_open+0x2ca/0x590 fs/open.c:1096
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x414411
RSP: 002b:00007f7125a087a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000414411
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f7125a08850
RBP: 000000000075bfc8 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f7125a096d4
R13: 00000000004ca412 R14: 00000000004e2ab8 R15: 00000000ffffffff
INFO: task syz-executor.0:10129 blocked for more than 140 seconds.
      Not tainted 4.14.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29152 10129   9556 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 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/0xe20 fs/open.c:789
 vfs_open+0x105/0x230 fs/open.c:903
 do_last fs/namei.c:3539 [inline]
 path_openat+0xb6c/0x2be0 fs/namei.c:3681
 do_filp_open+0x1a1/0x280 fs/namei.c:3715
 do_sys_open+0x2ca/0x590 fs/open.c:1096
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x414411
RSP: 002b:00007f71259a57a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000414411
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f71259a5850
RBP: 000000000075c1c0 R08: 000000000000000f R09: 0000000000000000
R10: 00007f71259a69d0 R11: 0000000000000293 R12: 00007f71259a66d4
R13: 00000000004ca412 R14: 00000000004e2ab8 R15: 00000000ffffffff
INFO: task syz-executor.2:10094 blocked for more than 140 seconds.
      Not tainted 4.14.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D27376 10094   8880 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893
 loop_control_ioctl+0x183/0x310 drivers/block/loop.c:1997
 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/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a679
RSP: 002b:00007f7cd45bec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000007
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7cd45bf6d4
R13: 00000000004c40dc R14: 00000000004d8b58 R15: 00000000ffffffff
INFO: task syz-executor.2:10114 blocked for more than 140 seconds.
      Not tainted 4.14.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D29856 10114   8880 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893
 loop_control_ioctl+0x71/0x310 drivers/block/loop.c:1983
 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/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a679
RSP: 002b:00007f7cd459dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000007
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7cd459e6d4
R13: 00000000004c40b1 R14: 00000000004d8b28 R15: 00000000ffffffff
INFO: task syz-executor.2:10121 blocked for more than 140 seconds.
      Not tainted 4.14.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D27184 10121   8880 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893
 loop_control_ioctl+0x71/0x310 drivers/block/loop.c:1983
 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/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a679
RSP: 002b:00007f7cd457cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000008
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7cd457d6d4
R13: 00000000004c40b1 R14: 00000000004d8b28 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/23:
 #0:  (tasklist_lock){.+.+}, at: [<00000000015b2699>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544
1 lock held by rsyslogd/1630:
 #0:  (&f->f_pos_lock){+.+.}, at: [<00000000c4cc23a2>] __fdget_pos+0xb5/0xd0 fs/file.c:769
2 locks held by getty/1758:
 #0:  (&tty->ldisc_sem){++++}, at: [<0000000080b465f6>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000f828aba2>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.5/1839:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<00000000075b23db>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
2 locks held by syz-executor.3/8340:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<00000000075b23db>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
 #1:  (loop_index_mutex){+.+.}, at: [<0000000056a46b38>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
1 lock held by syz-executor.1/8350:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<00000000075b23db>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
2 locks held by syz-executor.4/8892:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<00000000075b23db>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
 #1:  (loop_index_mutex){+.+.}, at: [<0000000056a46b38>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
2 locks held by syz-executor.0/10095:
 #0:  (&lo->lo_ctl_mutex/1){+.+.}, at: [<0000000032bbf5af>] lo_ioctl+0x86/0x1a30 drivers/block/loop.c:1404
 #1:  (&bdev->bd_mutex){+.+.}, at: [<00000000aca1b368>] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
2 locks held by syz-executor.0/10106:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<00000000075b23db>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
 #1:  (loop_index_mutex){+.+.}, at: [<0000000056a46b38>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
1 lock held by syz-executor.0/10129:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<00000000075b23db>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
2 locks held by syz-executor.2/10094:
 #0:  (loop_index_mutex){+.+.}, at: [<00000000941b13fe>] loop_control_ioctl+0x71/0x310 drivers/block/loop.c:1983
 #1:  (&lo->lo_ctl_mutex#2){+.+.}, at: [<00000000e36b2ab4>] loop_control_ioctl+0x183/0x310 drivers/block/loop.c:1997
1 lock held by syz-executor.2/10114:
 #0:  (loop_index_mutex){+.+.}, at: [<00000000941b13fe>] loop_control_ioctl+0x71/0x310 drivers/block/loop.c:1983
1 lock held by syz-executor.2/10121:
 #0:  (loop_index_mutex){+.+.}, at: [<00000000941b13fe>] loop_control_ioctl+0x71/0x310 drivers/block/loop.c:1983
1 lock held by syz-executor.2/10132:
 #0:  (loop_index_mutex){+.+.}, at: [<00000000941b13fe>] loop_control_ioctl+0x71/0x310 drivers/block/loop.c:1983
2 locks held by blkid/10098:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<00000000075b23db>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
 #1:  (loop_index_mutex){+.+.}, at: [<0000000056a46b38>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
2 locks held by blkid/10103:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<00000000075b23db>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
 #1:  (loop_index_mutex){+.+.}, at: [<0000000056a46b38>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
1 lock held by blkid/10108:
 #0:  (&bdev->bd_mutex){+.+.}, at: [<00000000075b23db>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457

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

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.156-syzkaller #0
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xe5/0x154 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x119/0x147 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+0x629/0xbe0 kernel/hung_task.c:274
 kthread+0x31f/0x430 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffffb4ca7033

Crashes (1859):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/11/30 16:13 android-4.14 714ada7cabc7 3a75be00 .config console log report ci-android-414-kasan-gce-root
2019/11/29 19:28 android-4.14 714ada7cabc7 d29b9e84 .config console log report ci-android-414-kasan-gce-root
2019/11/25 17:50 android-4.14 f9b4ab5c8e99 371caf77 .config console log report ci-android-414-kasan-gce-root
2019/11/24 11:29 android-4.14 437a2a739c5f 598ca6c8 .config console log report ci-android-414-kasan-gce-root
2019/11/24 03:17 android-4.14 437a2a739c5f 598ca6c8 .config console log report ci-android-414-kasan-gce-root
2019/11/23 14:56 android-4.14 437a2a739c5f 598ca6c8 .config console log report ci-android-414-kasan-gce-root
2019/11/22 22:56 android-4.14 437a2a739c5f 598ca6c8 .config console log report ci-android-414-kasan-gce-root
2019/11/22 05:00 android-4.14 7bc77fd33905 8098ea0f .config console log report ci-android-414-kasan-gce-root
2019/11/21 16:57 android-4.14 7bc77fd33905 8098ea0f .config console log report ci-android-414-kasan-gce-root
2019/11/19 01:07 android-4.14 460dc7c31cef 5bc70212 .config console log report ci-android-414-kasan-gce-root
2019/11/18 09:37 android-4.14 460dc7c31cef d5696d51 .config console log report ci-android-414-kasan-gce-root
2019/11/18 05:53 android-4.14 460dc7c31cef d5696d51 .config console log report ci-android-414-kasan-gce-root
2019/11/18 00:30 android-4.14 460dc7c31cef d5696d51 .config console log report ci-android-414-kasan-gce-root
2019/11/17 13:09 android-4.14 460dc7c31cef d5696d51 .config console log report ci-android-414-kasan-gce-root
2019/11/15 21:04 android-4.14 460dc7c31cef cdac920b .config console log report ci-android-414-kasan-gce-root
2019/11/15 05:03 android-4.14 460dc7c31cef a24fe792 .config console log report ci-android-414-kasan-gce-root
2019/11/13 09:44 android-4.14 0ac69147fd8c 048f2d49 .config console log report ci-android-414-kasan-gce-root
2019/11/11 09:34 android-4.14 10e570bfc15a dc438b91 .config console log report ci-android-414-kasan-gce-root
2019/11/11 06:47 android-4.14 10e570bfc15a dc438b91 .config console log report ci-android-414-kasan-gce-root
2019/11/07 13:00 android-4.14 6e5cc2351dea d797d201 .config console log report ci-android-414-kasan-gce-root
2019/11/06 13:26 android-4.14 2b2bb0cce0a5 bc2c6e45 .config console log report ci-android-414-kasan-gce-root
2019/11/06 11:31 android-4.14 2b2bb0cce0a5 bc2c6e45 .config console log report ci-android-414-kasan-gce-root
2019/11/01 10:05 android-4.14 6409e7e01d11 a41ca8fa .config console log report ci-android-414-kasan-gce-root
2019/10/31 19:42 android-4.14 6409e7e01d11 a41ca8fa .config console log report ci-android-414-kasan-gce-root
2019/10/27 00:23 android-4.14 2d0e4c21fcee 25bb509e .config console log report ci-android-414-kasan-gce-root
2019/10/25 23:58 android-4.14 3e5dc4ed2d3f c2e837da .config console log report ci-android-414-kasan-gce-root
2019/10/22 08:10 android-4.14 7d642373db4c c59a7cd8 .config console log report ci-android-414-kasan-gce-root
2019/10/18 11:33 android-4.14 234de92896af 8c88c9c1 .config console log report ci-android-414-kasan-gce-root
2019/10/05 18:57 android-4.14 ed203b32ee7e f3f7d9c8 .config console log report ci-android-414-kasan-gce-root
2019/09/29 06:58 android-4.14 d649ef04c3ed eb6b9855 .config console log report ci-android-414-kasan-gce-root
2019/09/27 07:36 android-4.14 d649ef04c3ed 2f1548bc .config console log report ci-android-414-kasan-gce-root
2019/09/23 10:59 android-4.14 8ae37de3fa03 d96e88f3 .config console log report ci-android-414-kasan-gce-root
2019/09/23 03:12 android-4.14 8ae37de3fa03 d96e88f3 .config console log report ci-android-414-kasan-gce-root
2019/09/20 12:20 android-4.14 290dd9dfcbe8 d96e88f3 .config console log report ci-android-414-kasan-gce-root
2019/09/18 11:43 android-4.14 ca30356b2a26 c2dcd700 .config console log report ci-android-414-kasan-gce-root
2019/09/15 03:34 android-4.14 f02af7b02c26 32d59357 .config console log report ci-android-414-kasan-gce-root
2019/09/09 10:11 android-4.14 4eccd8013349 a60cb4cd .config console log report ci-android-414-kasan-gce-root
2019/09/06 05:26 android-4.14 38733badc0e6 040fda58 .config console log report ci-android-414-kasan-gce-root
2019/09/05 16:32 android-4.14 38733badc0e6 040fda58 .config console log report ci-android-414-kasan-gce-root
2019/09/03 02:44 android-4.14 a9d0871a562e 14544a56 .config console log report ci-android-414-kasan-gce-root
2019/09/02 06:03 android-4.14 a9d0871a562e db7c31ca .config console log report ci-android-414-kasan-gce-root
2019/08/26 13:13 android-4.14 f5189d4af2b5 d21c5d9d .config console log report ci-android-414-kasan-gce-root
2019/08/26 05:07 android-4.14 f5189d4af2b5 d21c5d9d .config console log report ci-android-414-kasan-gce-root
2019/08/21 16:20 android-4.14 e204fa49a029 4ea67ff8 .config console log report ci-android-414-kasan-gce-root
2019/08/15 19:14 android-4.14 0e28694fe668 0d298d6b .config console log report ci-android-414-kasan-gce-root
2019/08/08 00:32 android-4.14 b9cd593b1ba7 e6ebef88 .config console log report ci-android-414-kasan-gce-root
2019/08/06 18:28 android-4.14 889977e308d1 c6f01e54 .config console log report ci-android-414-kasan-gce-root
2019/08/06 14:05 android-4.14 889977e308d1 6affd8e8 .config console log report ci-android-414-kasan-gce-root
2019/07/25 10:38 android-4.14 85282d7e792d 32329ceb .config console log report ci-android-414-kasan-gce-root
2018/08/30 04:16 android-4.14 47350a9f13c6 6c7e9d3d .config console log report ci-android-414-kasan-gce-root
* Struck through repros no longer work on HEAD.