INFO: task syz-executor.3:18404 blocked for more than 140 seconds.
Not tainted 4.9.202+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D25544 18404 1 0x00000004
0000000000000083 ffff8801c0145f00 ffff8801d2624d00 ffff8801db71ffc0
ffff8801d1788000 ffff8801db71ffd8 ffff8801c46b7688 ffffffff8280a1de
0000000041b58ab3 ffffffff82e2ad88 00ffffff812051e0 ffff8801db7208b0
Call Trace:
[<000000009c244bb3>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
[<00000000e7905995>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579
[<000000005c87e2ec>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
[<000000005c87e2ec>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
[<0000000000a327f4>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
[<0000000076646e34>] __blkdev_get+0x268/0xeb0 fs/block_dev.c:1287
[<000000003b90387c>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1424
[<0000000071092c10>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1579
[<00000000d708ca02>] do_dentry_open+0x422/0xd20 fs/open.c:791
[<000000005acd11d2>] vfs_open+0x105/0x230 fs/open.c:904
[<0000000021a3bd0c>] do_last fs/namei.c:3457 [inline]
[<0000000021a3bd0c>] path_openat+0xbf5/0x2f60 fs/namei.c:3581
[<000000009d73c2af>] do_filp_open+0x1a1/0x280 fs/namei.c:3615
[<000000002cdabebf>] do_sys_open+0x2f0/0x610 fs/open.c:1097
[<00000000486a3bfa>] SYSC_open fs/open.c:1115 [inline]
[<00000000486a3bfa>] SyS_open+0x2d/0x40 fs/open.c:1110
[<000000004a69949d>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
[<0000000028c2d5a6>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Showing all locks held in the system:
2 locks held by khungtaskd/24:
#0: (rcu_read_lock){......}, at: [<00000000aa0e707f>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline]
#0: (rcu_read_lock){......}, at: [<00000000aa0e707f>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263
#1: (tasklist_lock){.+.+..}, at: [<00000000b029d023>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339
1 lock held by rsyslogd/1900:
#0: (&f->f_pos_lock){+.+.+.}, at: [<00000000dcc464d8>] __fdget_pos+0xa8/0xd0 fs/file.c:782
2 locks held by getty/2028:
#0: (&tty->ldisc_sem){++++++}, at: [<00000000e91f749a>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000bc47ddc6>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.3/18404:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000000b9e403>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<0000000000a327f4>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
2 locks held by syz-executor.1/19411:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000000b9e403>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<0000000000a327f4>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
2 locks held by syz-executor.4/22769:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000000b9e403>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<0000000000a327f4>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
1 lock held by syz-executor.5/23037:
#0: (loop_index_mutex){+.+.+.}, at: [<00000000699b92ea>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1974
1 lock held by syz-executor.5/23048:
#0: (loop_index_mutex){+.+.+.}, at: [<00000000699b92ea>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1974
1 lock held by syz-executor.5/23050:
#0: (loop_index_mutex){+.+.+.}, at: [<00000000699b92ea>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1974
2 locks held by syz-executor.0/23028:
#0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000c25a371a>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404
#1: (&bdev->bd_mutex){+.+.+.}, at: [<00000000dcaca81b>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
1 lock held by syz-executor.0/23036:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000000b9e403>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
2 locks held by syz-executor.5/23029:
#0: (loop_index_mutex){+.+.+.}, at: [<00000000699b92ea>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1974
#1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<000000002a3911cd>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1988
2 locks held by blkid/23031:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000000b9e403>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<0000000000a327f4>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
2 locks held by syz-executor.2/23053:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000000b9e403>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<0000000000a327f4>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.202+ #0
ffff8801d98f7cc8 ffffffff81b55d2b 0000000000000000 0000000000000000
0000000000000000 ffffffff8109a001 dffffc0000000000 ffff8801d98f7d00
ffffffff81b60fcc 0000000000000000 0000000000000000 0000000000000000
Call Trace:
[<000000004e3a0cda>] __dump_stack lib/dump_stack.c:15 [inline]
[<000000004e3a0cda>] dump_stack+0xcb/0x130 lib/dump_stack.c:56
[<00000000f2b7a3e8>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
[<000000005296614f>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
[<000000001fa8aba1>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
[<00000000352a00e8>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
[<00000000352a00e8>] check_hung_task kernel/hung_task.c:126 [inline]
[<00000000352a00e8>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline]
[<00000000352a00e8>] watchdog+0x670/0xaf0 kernel/hung_task.c:263
[<00000000b0788759>] kthread+0x278/0x310 kernel/kthread.c:211
[<0000000027eaab98>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff82819331