INFO: task hung in blkdev_reread_part
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syzbot
Apr 11, 2019, 7:39:13 AM4/11/19
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 1ec8f1f0 Linux 4.14.111
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1595f6af200000
kernel config: https://syzkaller.appspot.com/x/.config?x=fdadf290ea9fc6f9
dashboard link: https://syzkaller.appspot.com/bug?extid=c14eb8e64a2a458891ee
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c14eb8...@syzkaller.appspotmail.com
INFO: task syz-executor.0:7169 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D24992 7169 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
blkdev_reread_part+0x1f/0x40 block/ioctl.c:192
loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:615
loop_clr_fd+0x844/0xae0 drivers/block/loop.c:1069
lo_ioctl+0x8d0/0x1c70 drivers/block/loop.c:1415
__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: 0033:0x458167
RSP: 002b:00007fffea7e8d68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458167
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 0000000000001843 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffea7e8da0 R14: 00000000000cf2b6 R15: 00007fffea7e8db0
INFO: task syz-executor.5:7173 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D24992 7173 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: 0033:0x412270
RSP: 002b:00007ffe78510668 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00000000000cf59a RCX: 0000000000412270
RDX: 00007ffe785106fa RSI: 0000000000000002 RDI: 00007ffe785106f0
RBP: 00000000000017d5 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe785106a0 R14: 00000000000cf25f R15: 00007ffe785106b0
INFO: task syz-executor.2:7174 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D24528 7174 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: 0033:0x412270
RSP: 002b:00007ffedb7123e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00000000000cf350 RCX: 0000000000412270
RDX: 00007ffedb71247a RSI: 0000000000000002 RDI: 00007ffedb712470
RBP: 000000000000181a R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffedb712420 R14: 00000000000cf2e4 R15: 00007ffedb712430
INFO: task syz-executor.3:7175 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D24992 7175 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: 0033:0x412090
RSP: 002b:00007fff7cd77da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000412090
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 0000000000001823 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff7cd77de0 R14: 00000000000cf2ae R15: 00007fff7cd77df0
INFO: task syz-executor.1:7176 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D24992 7176 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: 0033:0x458167
RSP: 002b:00007ffca6b3a968 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458167
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 00000000000018d3 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffca6b3a9a0 R14: 00000000000cf2bf R15: 00007ffca6b3a9b0
INFO: task syz-executor.4:7177 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D25168 7177 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: 0033:0x412270
RSP: 002b:00007ffcb2f375b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00000000000cf30f RCX: 0000000000412270
RDX: 00007ffcb2f3764a RSI: 0000000000000002 RDI: 00007ffcb2f37640
RBP: 0000000000001798 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcb2f375f0 R14: 00000000000cf2e7 R15: 00007ffcb2f37600
INFO: task blkid:29850 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D29040 29850 7135 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: 0033:0x7f22250c7120
RSP: 002b:00007ffe80fc67a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f22250c7120
RDX: 00007ffe80fc8f33 RSI: 0000000000000000 RDI: 00007ffe80fc8f33
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000214f030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
INFO: task blkid:29851 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D28608 29851 7134 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: 0033:0x7f6ef9113120
RSP: 002b:00007ffdf6906548 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6ef9113120
RDX: 00007ffdf6907f40 RSI: 0000000000000000 RDI: 00007ffdf6907f40
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000010d0030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
Showing all locks held in the system:
1 lock held by khungtaskd/1009:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81486028>]
debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4544
1 lock held by rsyslogd/7004:
#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff8193df4b>]
__fdget_pos+0xab/0xd0 fs/file.c:769
2 locks held by getty/7126:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7127:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7128:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7129:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7130:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7131:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7132:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.0/7169:
#0: (loop_ctl_mutex/1){+.+.}, at: [<ffffffff83737707>]
lo_ioctl+0x87/0x1c70 drivers/block/loop.c:1405
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffff82ca511f>]
blkdev_reread_part+0x1f/0x40 block/ioctl.c:192
2 locks held by syz-executor.5/7173:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a3455>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff83730e7d>] lo_open+0x1d/0xb0
drivers/block/loop.c:1624
2 locks held by syz-executor.2/7174:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a3455>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff83730e7d>] lo_open+0x1d/0xb0
drivers/block/loop.c:1624
3 locks held by syz-executor.3/7175:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a2bc6>]
__blkdev_put+0xa6/0x7f0 fs/block_dev.c:1778
#1: (loop_index_mutex){+.+.}, at: [<ffffffff83735a2e>]
lo_release+0x1e/0x1b0 drivers/block/loop.c:1667
#2: (loop_ctl_mutex#2){+.+.}, at: [<ffffffff83735a94>] __lo_release
drivers/block/loop.c:1644 [inline]
#2: (loop_ctl_mutex#2){+.+.}, at: [<ffffffff83735a94>]
lo_release+0x84/0x1b0 drivers/block/loop.c:1668
1 lock held by syz-executor.1/7176:
#0: (loop_ctl_mutex/1){+.+.}, at: [<ffffffff83737707>]
lo_ioctl+0x87/0x1c70 drivers/block/loop.c:1405
2 locks held by syz-executor.4/7177:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a3455>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff83730e7d>] lo_open+0x1d/0xb0
drivers/block/loop.c:1624
1 lock held by blkid/29850:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a3455>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
2 locks held by blkid/29851:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a3455>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff83730e7d>] lo_open+0x1d/0xb0
drivers/block/loop.c:1624
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1009 Comm: khungtaskd Not tainted 4.14.111 #1
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:194 [inline]
watchdog+0x5d8/0xb80 kernel/hung_task.c:250
kthread+0x31c/0x430 kernel/kthread.c:232
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff861a94c2
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: 1ec8f1f0 Linux 4.14.111
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1595f6af200000
kernel config: https://syzkaller.appspot.com/x/.config?x=fdadf290ea9fc6f9
dashboard link: https://syzkaller.appspot.com/bug?extid=c14eb8e64a2a458891ee
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c14eb8...@syzkaller.appspotmail.com
INFO: task syz-executor.0:7169 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D24992 7169 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
blkdev_reread_part+0x1f/0x40 block/ioctl.c:192
loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:615
loop_clr_fd+0x844/0xae0 drivers/block/loop.c:1069
lo_ioctl+0x8d0/0x1c70 drivers/block/loop.c:1415
__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: 0033:0x458167
RSP: 002b:00007fffea7e8d68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458167
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 0000000000001843 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffea7e8da0 R14: 00000000000cf2b6 R15: 00007fffea7e8db0
INFO: task syz-executor.5:7173 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D24992 7173 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: 0033:0x412270
RSP: 002b:00007ffe78510668 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00000000000cf59a RCX: 0000000000412270
RDX: 00007ffe785106fa RSI: 0000000000000002 RDI: 00007ffe785106f0
RBP: 00000000000017d5 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe785106a0 R14: 00000000000cf25f R15: 00007ffe785106b0
INFO: task syz-executor.2:7174 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D24528 7174 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: 0033:0x412270
RSP: 002b:00007ffedb7123e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00000000000cf350 RCX: 0000000000412270
RDX: 00007ffedb71247a RSI: 0000000000000002 RDI: 00007ffedb712470
RBP: 000000000000181a R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffedb712420 R14: 00000000000cf2e4 R15: 00007ffedb712430
INFO: task syz-executor.3:7175 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D24992 7175 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: 0033:0x412090
RSP: 002b:00007fff7cd77da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000412090
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 0000000000001823 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff7cd77de0 R14: 00000000000cf2ae R15: 00007fff7cd77df0
INFO: task syz-executor.1:7176 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D24992 7176 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: 0033:0x458167
RSP: 002b:00007ffca6b3a968 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458167
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 00000000000018d3 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffca6b3a9a0 R14: 00000000000cf2bf R15: 00007ffca6b3a9b0
INFO: task syz-executor.4:7177 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D25168 7177 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: 0033:0x412270
RSP: 002b:00007ffcb2f375b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00000000000cf30f RCX: 0000000000412270
RDX: 00007ffcb2f3764a RSI: 0000000000000002 RDI: 00007ffcb2f37640
RBP: 0000000000001798 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcb2f375f0 R14: 00000000000cf2e7 R15: 00007ffcb2f37600
INFO: task blkid:29850 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D29040 29850 7135 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: 0033:0x7f22250c7120
RSP: 002b:00007ffe80fc67a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f22250c7120
RDX: 00007ffe80fc8f33 RSI: 0000000000000000 RDI: 00007ffe80fc8f33
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000214f030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
INFO: task blkid:29851 blocked for more than 140 seconds.
Not tainted 4.14.111 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D28608 29851 7134 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: 0033:0x7f6ef9113120
RSP: 002b:00007ffdf6906548 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6ef9113120
RDX: 00007ffdf6907f40 RSI: 0000000000000000 RDI: 00007ffdf6907f40
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000010d0030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
Showing all locks held in the system:
1 lock held by khungtaskd/1009:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81486028>]
debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4544
1 lock held by rsyslogd/7004:
#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff8193df4b>]
__fdget_pos+0xab/0xd0 fs/file.c:769
2 locks held by getty/7126:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7127:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7128:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7129:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7130:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7131:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7132:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861a89e3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83107006>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.0/7169:
#0: (loop_ctl_mutex/1){+.+.}, at: [<ffffffff83737707>]
lo_ioctl+0x87/0x1c70 drivers/block/loop.c:1405
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffff82ca511f>]
blkdev_reread_part+0x1f/0x40 block/ioctl.c:192
2 locks held by syz-executor.5/7173:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a3455>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff83730e7d>] lo_open+0x1d/0xb0
drivers/block/loop.c:1624
2 locks held by syz-executor.2/7174:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a3455>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff83730e7d>] lo_open+0x1d/0xb0
drivers/block/loop.c:1624
3 locks held by syz-executor.3/7175:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a2bc6>]
__blkdev_put+0xa6/0x7f0 fs/block_dev.c:1778
#1: (loop_index_mutex){+.+.}, at: [<ffffffff83735a2e>]
lo_release+0x1e/0x1b0 drivers/block/loop.c:1667
#2: (loop_ctl_mutex#2){+.+.}, at: [<ffffffff83735a94>] __lo_release
drivers/block/loop.c:1644 [inline]
#2: (loop_ctl_mutex#2){+.+.}, at: [<ffffffff83735a94>]
lo_release+0x84/0x1b0 drivers/block/loop.c:1668
1 lock held by syz-executor.1/7176:
#0: (loop_ctl_mutex/1){+.+.}, at: [<ffffffff83737707>]
lo_ioctl+0x87/0x1c70 drivers/block/loop.c:1405
2 locks held by syz-executor.4/7177:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a3455>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff83730e7d>] lo_open+0x1d/0xb0
drivers/block/loop.c:1624
1 lock held by blkid/29850:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a3455>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
2 locks held by blkid/29851:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a3455>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff83730e7d>] lo_open+0x1d/0xb0
drivers/block/loop.c:1624
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1009 Comm: khungtaskd Not tainted 4.14.111 #1
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:194 [inline]
watchdog+0x5d8/0xb80 kernel/hung_task.c:250
kthread+0x31c/0x430 kernel/kthread.c:232
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff861a94c2
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Oct 5, 2019, 2:24:08 PM10/5/19
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: db189223 Linux 4.14.147
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1330c493600000
kernel config: https://syzkaller.appspot.com/x/.config?x=14d726467704dd7
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=152aae8f600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c14eb8...@syzkaller.appspotmail.com
audit: type=1400 audit(1570299421.645:37): avc: denied { map } for
pid=7115 comm="sh" path="/bin/dash" dev="sda1" ino=1473
scontext=system_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
INFO: task syz-executor174:7090 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
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
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4414b7
RSP: 002b:00007ffd613be128 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004414b7
RDX: 00007ffd613be1c0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 0000000000000004 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 00000000004022c0
R13: 0000000000000005 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor174:7093 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
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
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4414b7
RSP: 002b:00007ffd613be128 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004414b7
RDX: 00007ffd613be1c0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 0000000000000004 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 00000000004022c0
R13: 0000000000000005 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor174:7102 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4415a9
RSP: 002b:00007ffd613be368 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004415a9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00000000000d2c52 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004022c0
R13: 0000000000402350 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor174:7104 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4415a9
RSP: 002b:00007ffd613be368 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004415a9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00000000000d2b30 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004022c0
R13: 0000000000402350 R14: 0000000000000000 R15: 0000000000000000
INFO: task blkid:7106 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
__blkdev_get+0x2c7/0x1120 fs/block_dev.c:1472
vfs_open+0x105/0x220 fs/open.c:891
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: 0033:0x7f084344b120
RSP: 002b:00007ffeb592fa88 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f084344b120
RDX: 00007ffeb5931f41 RSI: 0000000000000000 RDI: 00007ffeb5931f41
Not tainted 4.14.147 #0
__blkdev_get+0xaad/0x1120 fs/block_dev.c:1537
vfs_open+0x105/0x220 fs/open.c:891
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: 0033:0x7f78144f1120
RSP: 002b:00007ffd7ea24788 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f78144f1120
RDX: 00007ffd7ea25f41 RSI: 0000000000000000 RDI: 00007ffd7ea25f41
Not tainted 4.14.147 #0
__blkdev_get+0xaad/0x1120 fs/block_dev.c:1537
vfs_open+0x105/0x220 fs/open.c:891
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: 0033:0x7f9018b95120
RSP: 002b:00007ffc1fe71568 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9018b95120
RDX: 00007ffc1fe72f41 RSI: 0000000000000000 RDI: 00007ffc1fe72f41
Not tainted 4.14.147 #0
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4415a9
RSP: 002b:00007ffd613be368 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004415a9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00000000000d2bf2 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004022c0
R13: 0000000000402350 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor174:7111 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4415a9
RSP: 002b:00007ffd613be368 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004415a9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00000000000d2c82 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004022c0
R13: 0000000000402350 R14: 0000000000000000 R15: 0000000000000000
INFO: task blkid:7112 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
__blkdev_get+0x2c7/0x1120 fs/block_dev.c:1472
vfs_open+0x105/0x220 fs/open.c:891
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: 0033:0x7f082586e120
RSP: 002b:00007ffc99c74318 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f082586e120
RDX: 00007ffc99c75f41 RSI: 0000000000000000 RDI: 00007ffc99c75f41
#0: (tasklist_lock){.+.+}, at: [<ffffffff814875e8>]
debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4544
2 locks held by getty/6965:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6966:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6967:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6968:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6969:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6970:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6971:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor174/7090:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff8373bf2f>]
lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffff82cafcaf>]
blkdev_reread_part+0x1f/0x40 block/ioctl.c:192
2 locks held by syz-executor174/7093:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff8373bf2f>]
lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffff82cafcaf>]
blkdev_reread_part+0x1f/0x40 block/ioctl.c:192
1 lock held by syz-executor174/7102:
#0: (loop_index_mutex){+.+.}, at: [<ffffffff8373bab5>]
loop_control_ioctl+0x65/0x2f0 drivers/block/loop.c:1982
2 locks held by syz-executor174/7104:
#0: (loop_index_mutex){+.+.}, at: [<ffffffff8373bab5>]
loop_control_ioctl+0x65/0x2f0 drivers/block/loop.c:1982
#1: (&lo->lo_ctl_mutex#2){+.+.}, at: [<ffffffff8373bba3>]
loop_control_ioctl+0x153/0x2f0 drivers/block/loop.c:1996
2 locks held by blkid/7106:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a8d65>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff837356dd>] lo_open+0x1d/0xb0
drivers/block/loop.c:1623
2 locks held by blkid/7108:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a8d65>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff837356dd>] lo_open+0x1d/0xb0
drivers/block/loop.c:1623
2 locks held by blkid/7109:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a8d65>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff837356dd>] lo_open+0x1d/0xb0
drivers/block/loop.c:1623
1 lock held by syz-executor174/7110:
#0: (loop_index_mutex){+.+.}, at: [<ffffffff8373bab5>]
loop_control_ioctl+0x65/0x2f0 drivers/block/loop.c:1982
1 lock held by syz-executor174/7111:
#0: (loop_index_mutex){+.+.}, at: [<ffffffff8373bab5>]
loop_control_ioctl+0x65/0x2f0 drivers/block/loop.c:1982
2 locks held by blkid/7112:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a8d65>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff837356dd>] lo_open+0x1d/0xb0
drivers/block/loop.c:1623
2 locks held by blkid/7113:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a8d65>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff837356dd>] lo_open+0x1d/0xb0
drivers/block/loop.c:1623
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1012 Comm: khungtaskd Not tainted 4.14.147 #0
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 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff861c48ae
HEAD commit: db189223 Linux 4.14.147
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1330c493600000
kernel config: https://syzkaller.appspot.com/x/.config?x=14d726467704dd7
dashboard link: https://syzkaller.appspot.com/bug?extid=c14eb8e64a2a458891ee
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10be0699600000
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=152aae8f600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c14eb8...@syzkaller.appspotmail.com
pid=7115 comm="sh" path="/bin/dash" dev="sda1" ino=1473
scontext=system_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
INFO: task syz-executor174:7090 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor174 D28368 7090 6995 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
context_switch kernel/sched/core.c:2807 [inline]
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:614
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_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
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
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
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4414b7
RSP: 002b:00007ffd613be128 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004414b7
RDX: 00007ffd613be1c0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 0000000000000004 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 00000000004022c0
R13: 0000000000000005 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor174:7093 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor174 D28208 7093 6990 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
context_switch kernel/sched/core.c:2807 [inline]
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:614
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_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
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
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
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4414b7
RSP: 002b:00007ffd613be128 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004414b7
RDX: 00007ffd613be1c0 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 0000000000000004 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000202 R12: 00000000004022c0
R13: 0000000000000005 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor174:7102 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor174 D28168 7102 6993 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
context_switch kernel/sched/core.c:2807 [inline]
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
loop_control_ioctl+0x65/0x2f0 drivers/block/loop.c:1982
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
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
file_ioctl fs/ioctl.c:500 [inline]
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
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4415a9
RSP: 002b:00007ffd613be368 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004415a9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00000000000d2c52 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004022c0
R13: 0000000000402350 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor174:7104 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor174 D28528 7104 6994 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
context_switch kernel/sched/core.c:2807 [inline]
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
loop_control_ioctl+0x153/0x2f0 drivers/block/loop.c:1996
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
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
file_ioctl fs/ioctl.c:500 [inline]
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
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4415a9
RSP: 002b:00007ffd613be368 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004415a9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00000000000d2b30 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004022c0
R13: 0000000000402350 R14: 0000000000000000 R15: 0000000000000000
INFO: task blkid:7106 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D28936 7106 7005 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
context_switch kernel/sched/core.c:2807 [inline]
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:1623
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+0x2c7/0x1120 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+0x73b/0xeb0 fs/open.c:777
blkdev_open+0x1d1/0x260 fs/block_dev.c:1770
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
path_openat+0x8bd/0x3f70 fs/namei.c:3566
do_filp_open+0x18e/0x250 fs/namei.c:3600
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: 0033:0x7f084344b120
RSP: 002b:00007ffeb592fa88 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f084344b120
RDX: 00007ffeb5931f41 RSI: 0000000000000000 RDI: 00007ffeb5931f41
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000f10030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
INFO: task blkid:7108 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D28656 7108 6660 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
context_switch kernel/sched/core.c:2807 [inline]
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:1623
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+0xaad/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+0x73b/0xeb0 fs/open.c:777
blkdev_open+0x1d1/0x260 fs/block_dev.c:1770
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
path_openat+0x8bd/0x3f70 fs/namei.c:3566
do_filp_open+0x18e/0x250 fs/namei.c:3600
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: 0033:0x7f78144f1120
RSP: 002b:00007ffd7ea24788 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f78144f1120
RDX: 00007ffd7ea25f41 RSI: 0000000000000000 RDI: 00007ffd7ea25f41
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000168a030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
INFO: task blkid:7109 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D29040 7109 6972 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
context_switch kernel/sched/core.c:2807 [inline]
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:1623
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+0xaad/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+0x73b/0xeb0 fs/open.c:777
blkdev_open+0x1d1/0x260 fs/block_dev.c:1770
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
path_openat+0x8bd/0x3f70 fs/namei.c:3566
do_filp_open+0x18e/0x250 fs/namei.c:3600
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: 0033:0x7f9018b95120
RSP: 002b:00007ffc1fe71568 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9018b95120
RDX: 00007ffc1fe72f41 RSI: 0000000000000000 RDI: 00007ffc1fe72f41
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000008b9030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
INFO: task syz-executor174:7110 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor174 D28528 7110 6992 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
context_switch kernel/sched/core.c:2807 [inline]
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
loop_control_ioctl+0x65/0x2f0 drivers/block/loop.c:1982
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
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
file_ioctl fs/ioctl.c:500 [inline]
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
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4415a9
RSP: 002b:00007ffd613be368 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004415a9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00000000000d2bf2 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004022c0
R13: 0000000000402350 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor174:7111 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor174 D28528 7111 6991 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
context_switch kernel/sched/core.c:2807 [inline]
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
loop_control_ioctl+0x65/0x2f0 drivers/block/loop.c:1982
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
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
file_ioctl fs/ioctl.c:500 [inline]
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
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4415a9
RSP: 002b:00007ffd613be368 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004415a9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00000000000d2c82 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004022c0
R13: 0000000000402350 R14: 0000000000000000 R15: 0000000000000000
INFO: task blkid:7112 blocked for more than 140 seconds.
Not tainted 4.14.147 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D28568 7112 7007 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
context_switch kernel/sched/core.c:2807 [inline]
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:1623
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+0x2c7/0x1120 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+0x73b/0xeb0 fs/open.c:777
blkdev_open+0x1d1/0x260 fs/block_dev.c:1770
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
path_openat+0x8bd/0x3f70 fs/namei.c:3566
do_filp_open+0x18e/0x250 fs/namei.c:3600
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: 0033:0x7f082586e120
RSP: 002b:00007ffc99c74318 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f082586e120
RDX: 00007ffc99c75f41 RSI: 0000000000000000 RDI: 00007ffc99c75f41
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001cb2030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
Showing all locks held in the system:
1 lock held by khungtaskd/1012:
Showing all locks held in the system:
#0: (tasklist_lock){.+.+}, at: [<ffffffff814875e8>]
debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4544
2 locks held by getty/6965:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6966:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6967:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6968:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6969:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6970:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6971:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861c3dc3>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff83111406>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor174/7090:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff8373bf2f>]
lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffff82cafcaf>]
blkdev_reread_part+0x1f/0x40 block/ioctl.c:192
2 locks held by syz-executor174/7093:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff8373bf2f>]
lo_ioctl+0x8f/0x1ce0 drivers/block/loop.c:1404
#1: (&bdev->bd_mutex){+.+.}, at: [<ffffffff82cafcaf>]
blkdev_reread_part+0x1f/0x40 block/ioctl.c:192
1 lock held by syz-executor174/7102:
#0: (loop_index_mutex){+.+.}, at: [<ffffffff8373bab5>]
loop_control_ioctl+0x65/0x2f0 drivers/block/loop.c:1982
2 locks held by syz-executor174/7104:
#0: (loop_index_mutex){+.+.}, at: [<ffffffff8373bab5>]
loop_control_ioctl+0x65/0x2f0 drivers/block/loop.c:1982
#1: (&lo->lo_ctl_mutex#2){+.+.}, at: [<ffffffff8373bba3>]
loop_control_ioctl+0x153/0x2f0 drivers/block/loop.c:1996
2 locks held by blkid/7106:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a8d65>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff837356dd>] lo_open+0x1d/0xb0
drivers/block/loop.c:1623
2 locks held by blkid/7108:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a8d65>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff837356dd>] lo_open+0x1d/0xb0
drivers/block/loop.c:1623
2 locks held by blkid/7109:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a8d65>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff837356dd>] lo_open+0x1d/0xb0
drivers/block/loop.c:1623
1 lock held by syz-executor174/7110:
#0: (loop_index_mutex){+.+.}, at: [<ffffffff8373bab5>]
loop_control_ioctl+0x65/0x2f0 drivers/block/loop.c:1982
1 lock held by syz-executor174/7111:
#0: (loop_index_mutex){+.+.}, at: [<ffffffff8373bab5>]
loop_control_ioctl+0x65/0x2f0 drivers/block/loop.c:1982
2 locks held by blkid/7112:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a8d65>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff837356dd>] lo_open+0x1d/0xb0
drivers/block/loop.c:1623
2 locks held by blkid/7113:
#0: (&bdev->bd_mutex){+.+.}, at: [<ffffffff819a8d65>]
__blkdev_get+0x145/0x1120 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<ffffffff837356dd>] lo_open+0x1d/0xb0
drivers/block/loop.c:1623
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1012 Comm: khungtaskd Not tainted 4.14.147 #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
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
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]
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]
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 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff861c48ae
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