netlink: 68 bytes leftover after parsing attributes in process `syz-executor2'.
netlink: 68 bytes leftover after parsing attributes in process `syz-executor2'.
INFO: task syz-executor5:14356 blocked for more than 140 seconds.
      Not tainted 4.9.125+ #37
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D27832 14356   2143 0x00000004
 ffff8801d32b17c0 ffff880187e36e00 ffff880187e36e00 ffff8801d80d2f80
 ffff8801db621018 ffff8801c5effb48 ffffffff8277d092 0000000000000000
 ffff8801d32b2070 ffffed003a65640d 00ff8801d32b17c0 ffff8801db6218f0
Call Trace:
 [<ffffffff8277e5bf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff8277ef43>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82780bc6>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82780bc6>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff81d8a61a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1915
 [<ffffffff815270dc>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815270dc>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815270dc>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff8152815f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff8152815f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<ffffffff8278c193>] 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: [<ffffffff81309abc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309abc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813e68fc>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1900:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c11c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2028:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278a262>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cdd442>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor5/14356:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81d8a61a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1915
2 locks held by syz-executor5/14404:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81d8a61a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1915
 #1:  (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<ffffffff81d8a726>] loop_control_ioctl+0x186/0x300 drivers/block/loop.c:1929
1 lock held by syz-executor5/14416:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81d8a61a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1915
2 locks held by syz-executor0/14406:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff81d88a8c>] lo_ioctl+0x8c/0x1670 drivers/block/loop.c:1353
 #1:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81aba3be>] blkdev_reread_part+0x1e/0x40 block/ioctl.c:189
1 lock held by syz-executor0/14423:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a428c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
1 lock held by syz-executor0/14435:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a428c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
1 lock held by syz-executor0/14447:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a428c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
2 locks held by blkid/14411:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a428c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81d829eb>] lo_open+0x1b/0xa0 drivers/block/loop.c:1564

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.125+ #37
 ffff8801d9907d08 ffffffff81af0ae9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 ffffffff81afb849 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af0ae9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af0ae9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81afb849>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81afb7dc>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810968d4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8130a04d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8130a04d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8130a04d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8130a04d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8113d9ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278c35c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8278ada6