INFO: task syz-executor.2:8098 blocked for more than 140 seconds.
Not tainted 4.14.157-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D25312 8098 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:00007ffe96089938 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000093549 RCX: 00000000004143f0
RDX: 00007ffe960899ca RSI: 0000000000000002 RDI: 00007ffe960899c0
RBP: 00000000000004e9 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe96089970 R14: 0000000000093364 R15: 00007ffe96089980
INFO: task syz-executor.5:4273 blocked for more than 140 seconds.
Not tainted 4.14.157-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D25312 4273 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:00007fff128ad588 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00000000000933d0 RCX: 00000000004143f0
RDX: 00007fff128ad61a RSI: 0000000000000002 RDI: 00007fff128ad610
RBP: 000000000000010e R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff128ad5c0 R14: 00000000000930a2 R15: 00007fff128ad5d0
INFO: task syz-executor.4:5305 blocked for more than 140 seconds.
Not tainted 4.14.157-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D25312 5305 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:00007ffcbaa0b898 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000009339e RCX: 00000000004143f0
RDX: 00007ffcbaa0b92a RSI: 0000000000000002 RDI: 00007ffcbaa0b920
RBP: 0000000000000106 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcbaa0b8d0 R14: 000000000009337d R15: 00007ffcbaa0b8e0
INFO: task syz-executor.0:8889 blocked for more than 140 seconds.
Not tainted 4.14.157-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D25312 8889 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_reread_part+0x1b/0x40 block/ioctl.c:192
loop_reread_partitions+0x7f/0x90 drivers/block/loop.c:614
loop_clr_fd+0x835/0xad0 drivers/block/loop.c:1068
lo_ioctl+0x460/0x1a30 drivers/block/loop.c:1414
__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:00007ffc512cf6a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a4e7
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 0000000000000020 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc512cf6e0 R14: 000000000009324e R15: 00007ffc512cf6f0
INFO: task syz-executor.3:9440 blocked for more than 140 seconds.
Not tainted 4.14.157-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D27824 9440 8530 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:00007fd10ccb4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd10ccb56d4
R13: 00000000004c40dc R14: 00000000004d9518 R15: 00000000ffffffff
INFO: task syz-executor.3:9448 blocked for more than 140 seconds.
Not tainted 4.14.157-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D29024 9448 8530 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:00007fd10cc93c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000006
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd10cc946d4
R13: 00000000004c40b1 R14: 00000000004d94e8 R15: 00000000ffffffff
INFO: task blkid:9445 blocked for more than 140 seconds.
Not tainted 4.14.157-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid D28736 9445 7325 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: 0033:0x7fb5e71ca120
RSP: 002b:00007fffc6a6e128 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb5e71ca120
RDX: 00007fffc6a6ef41 RSI: 0000000000000000 RDI: 00007fffc6a6ef41
RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000aed030
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005
Showing all locks held in the system:
1 lock held by khungtaskd/23:
#0: (tasklist_lock){.+.+}, at: [<00000000e4fcf9a5>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544
1 lock held by rsyslogd/1638:
#0: (&f->f_pos_lock){+.+.}, at: [<0000000031e700f3>] __fdget_pos+0xb5/0xd0 fs/file.c:769
2 locks held by getty/1766:
#0: (&tty->ldisc_sem){++++}, at: [<00000000a12e2b62>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000034a49c5a>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.2/8098:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000000a1949e5>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<00000000c1d50bf4>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
2 locks held by syz-executor.5/4273:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000000a1949e5>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<00000000c1d50bf4>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
2 locks held by syz-executor.4/5305:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000000a1949e5>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<00000000c1d50bf4>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
2 locks held by syz-executor.0/8889:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000003d136b6f>] lo_ioctl+0x86/0x1a30 drivers/block/loop.c:1404
#1: (&bdev->bd_mutex){+.+.}, at: [<0000000006ab5398>] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192
2 locks held by syz-executor.3/9440:
#0: (loop_index_mutex){+.+.}, at: [<00000000bb773dde>] loop_control_ioctl+0x71/0x310 drivers/block/loop.c:1983
#1: (&lo->lo_ctl_mutex#2){+.+.}, at: [<00000000d6e5e368>] loop_control_ioctl+0x183/0x310 drivers/block/loop.c:1997
1 lock held by syz-executor.3/9448:
#0: (loop_index_mutex){+.+.}, at: [<00000000bb773dde>] loop_control_ioctl+0x71/0x310 drivers/block/loop.c:1983
2 locks held by blkid/9445:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000000a1949e5>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457
#1: (loop_index_mutex){+.+.}, at: [<00000000c1d50bf4>] lo_open+0x19/0xb0 drivers/block/loop.c:1624
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.157-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
CPU: 1 PID: 74 Comm: kworker/1:1H Not tainted 4.14.157-syzkaller #0
task: 000000004a26765f task.stack: 00000000509726ad
RIP: 0010:__switch_to_xtra+0xa/0x15e0 arch/x86/kernel/process.c:485
RSP: 0018:ffff8881d5967cb0 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffff8881d5da4680 RDI: ffff8881d5765e00
RBP: ffff8881d5da4680 R08: 0000000000000001 R09: ffffed103b7644fa
R10: ffffed103b7644f9 R11: ffff8881dbb227cf R12: ffff8881d5765e00
R13: ffffffff9023a8dc R14: ffffffff9023a8e3 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000130 CR3: 000000009c026003 CR4: 00000000001606a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__switch_to+0x851/0x1090 arch/x86/kernel/process_64.c:479
context_switch kernel/sched/core.c:2867 [inline]
__schedule+0x88c/0x1f80 kernel/sched/core.c:3455
schedule+0x92/0x1c0 kernel/sched/core.c:3499
worker_thread+0x270/0xdf0 kernel/workqueue.c:2292
kthread+0x31f/0x430 kernel/kthread.c:232
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404
Code: ff bf 01 00 00 00 e8 f6 43 10 00 65 8b 05 bf c5 5b 72 85 c0 74 01 c3 e8 83 09 fa ff c3 0f 1f 40 00 48 b8 00 00 00 00 00 fc ff df <55> 48 89 e5 41 57 41 56 41 55 49 89 fd 41 54 49 89 f4 53 48 83