INFO: task syz-executor.1:4651 blocked for more than 140 seconds.
Not tainted 4.9.194+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D25544 4651 1 0x00000004
0000000000000083 ffff8801c4548000 0000000000000000 ffff8801db621000
ffffffff83031180 ffff8801db621018 ffff8801a7107688 ffffffff8281af8e
ffffffff81bcd65c ffffffff841f8b40 000060fe2460f7d8 ffff8801db6218f0
Call Trace:
[<000000005880c26a>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
[<00000000b3f96b46>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579
[<0000000060fa625d>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
[<0000000060fa625d>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
[<000000009532e60b>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621
[<0000000084f03786>] __blkdev_get+0x268/0xeb0 fs/block_dev.c:1287
[<000000009724921a>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1424
[<00000000b8f9daf5>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1579
[<00000000d12bf83d>] do_dentry_open+0x422/0xd20 fs/open.c:791
[<00000000d15e2717>] vfs_open+0x105/0x230 fs/open.c:904
[<00000000b390a1af>] do_last fs/namei.c:3541 [inline]
[<00000000b390a1af>] path_openat+0xbf5/0x2f60 fs/namei.c:3665
[<000000000d6ed62b>] do_filp_open+0x1a1/0x280 fs/namei.c:3699
[<000000002214d2f5>] do_sys_open+0x2f0/0x610 fs/open.c:1097
[<00000000cae576fd>] SYSC_open fs/open.c:1115 [inline]
[<00000000cae576fd>] SyS_open+0x2d/0x40 fs/open.c:1110
[<00000000d0f95abc>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
[<0000000084c62786>] 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: [<00000000e75e1dae>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline]
#0: (rcu_read_lock){......}, at: [<00000000e75e1dae>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263
#1: (tasklist_lock){.+.+..}, at: [<00000000d5829008>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1897:
#0: (&f->f_pos_lock){+.+.+.}, at: [<000000008374be51>] __fdget_pos+0xa8/0xd0 fs/file.c:782
2 locks held by getty/2025:
#0: (&tty->ldisc_sem){++++++}, at: [<00000000c9d96c44>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.+.}, at: [<0000000022180d88>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.1/4651:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000c07e8aa1>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000009532e60b>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621
2 locks held by syz-executor.2/10148:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000c07e8aa1>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000009532e60b>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621
2 locks held by syz-executor.4/10806:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000c07e8aa1>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000009532e60b>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621
2 locks held by syz-executor.0/12251:
#0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000e828b045>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404
#1: (&bdev->bd_mutex){+.+.+.}, at: [<0000000052c6b808>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
2 locks held by syz-executor.5/12250:
#0: (loop_index_mutex){+.+.+.}, at: [<0000000033b23b27>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973
#1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<00000000a3b7008b>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1987
2 locks held by blkid/12261:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000c07e8aa1>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000009532e60b>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621
2 locks held by syz-executor.3/12269:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000c07e8aa1>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000009532e60b>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.194+ #0
ffff8801d98d7cc8 ffffffff81b67001 0000000000000001 0000000000000000
0000000000000001 ffffffff81099d01 dffffc0000000000 ffff8801d98d7d00
ffffffff81b7229c 0000000000000001 0000000000000000 0000000000000001
Call Trace:
[<00000000a7db22e5>] __dump_stack lib/dump_stack.c:15 [inline]
[<00000000a7db22e5>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<00000000435b6e3c>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
[<0000000046d4ee33>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
[<00000000b889ab74>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
[<00000000903981a5>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
[<00000000903981a5>] check_hung_task kernel/hung_task.c:126 [inline]
[<00000000903981a5>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline]
[<00000000903981a5>] watchdog+0x670/0xaf0 kernel/hung_task.c:263
[<000000001a5e6504>] kthread+0x278/0x310 kernel/kthread.c:211
[<000000004b7e1640>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8282a0e1