NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
INFO: task syz-executor.2:9560 blocked for more than 140 seconds.
      Not tainted 4.14.180-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D28144  9560   6363 0x00000004
Call Trace:
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_timeout+0x946/0xe40 kernel/time/timer.c:1723
 do_wait_for_common kernel/sched/completion.c:91 [inline]
 __wait_for_common kernel/sched/completion.c:112 [inline]
 wait_for_common kernel/sched/completion.c:123 [inline]
 wait_for_completion+0x241/0x390 kernel/sched/completion.c:144
 flush_work+0x3f5/0x780 kernel/workqueue.c:2893
 __cancel_work_timer+0x2d0/0x460 kernel/workqueue.c:2964
 p9_conn_destroy net/9p/trans_fd.c:873 [inline]
 p9_fd_close+0x299/0x420 net/9p/trans_fd.c:899
 p9_client_destroy+0x6b/0x570 net/9p/client.c:1115
 v9fs_session_close+0x45/0x2c0 fs/9p/v9fs.c:511
 v9fs_kill_super+0x49/0x90 fs/9p/vfs_super.c:233
 deactivate_locked_super+0x6c/0xd0 fs/super.c:319
 v9fs_mount+0x670/0x850 fs/9p/vfs_super.c:214
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x3c9/0x24f0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45ca29
RSP: 002b:00007f4058006c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000004f62c0 RCX: 000000000045ca29
RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000
RBP: 000000000078bf00 R08: 0000000020000940 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000752 R14: 00000000004ca315 R15: 00007f40580076d4

Showing all locks held in the system:
1 lock held by khungtaskd/1057:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff81465d33>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
2 locks held by kworker/1:3/7182:
 #0:  ("events"){+.+.}, at: [<ffffffff813b67b7>] work_static include/linux/workqueue.h:199 [inline]
 #0:  ("events"){+.+.}, at: [<ffffffff813b67b7>] set_work_data kernel/workqueue.c:619 [inline]
 #0:  ("events"){+.+.}, at: [<ffffffff813b67b7>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
 #0:  ("events"){+.+.}, at: [<ffffffff813b67b7>] process_one_work+0x727/0x1540 kernel/workqueue.c:2087
 #1:  ((&m->wq)){+.+.}, at: [<ffffffff813b67f1>] process_one_work+0x761/0x1540 kernel/workqueue.c:2091

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

NMI backtrace for cpu 1
CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 4.14.180-syzkaller #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+0x13e/0x194 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x139/0x17e 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+0x5e2/0xb80 kernel/hung_task.c:274
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8640d6be