pktgen: Cannot create thread for cpu 0 (-4)
pktgen: kernel_thread() failed for cpu 1
pktgen: Cannot create thread for cpu 1 (-4)
pktgen: Initialization failed for all threads
IPVS: stopping master sync thread 11744 ...
INFO: task syz-executor2:18358 blocked for more than 140 seconds.
      Not tainted 4.9.113-g47bbcd6 #10
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D28200 18358   8399 0x00000004
 ffff8801a73e0000 0000000000000000 ffff8801d37824c0 ffff8801cee31800
 ffff8801db221c18 ffff8801a73ef6b0 ffffffff839e909d ffffffff855ba770
 ffff8801cee31880 0000000000004626 00ff8801a73e08e0 ffff8801db2224e8
Call Trace:
 [<ffffffff839ea69f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f6ab1>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839ed863>] do_wait_for_common kernel/sched/completion.c:75 [inline]
 [<ffffffff839ed863>] __wait_for_common kernel/sched/completion.c:93 [inline]
 [<ffffffff839ed863>] wait_for_common kernel/sched/completion.c:101 [inline]
 [<ffffffff839ed863>] wait_for_completion+0x203/0x2e0 kernel/sched/completion.c:122
 [<ffffffff811897a4>] flush_work+0x3a4/0x6c0 kernel/workqueue.c:2846
 [<ffffffff811904fe>] __cancel_work_timer+0x17e/0x440 kernel/workqueue.c:2912
 [<ffffffff811907d7>] cancel_work_sync+0x17/0x20 kernel/workqueue.c:2947
 [<ffffffff839c3181>] p9_conn_destroy net/9p/trans_fd.c:857 [inline]
 [<ffffffff839c3181>] p9_fd_close+0x1f1/0x330 net/9p/trans_fd.c:883
 [<ffffffff839b0303>] p9_client_destroy+0x73/0x570 net/9p/client.c:1070
 [<ffffffff8195c616>] v9fs_session_close+0x46/0x110 fs/9p/v9fs.c:434
 [<ffffffff8194c5be>] v9fs_kill_super+0x4e/0xa0 fs/9p/vfs_super.c:226
 [<ffffffff8157a2e5>] deactivate_locked_super+0x75/0xd0 fs/super.c:310
 [<ffffffff8194d1a6>] v9fs_mount+0x3c6/0x810 fs/9p/vfs_super.c:207
 [<ffffffff8157e2ac>] mount_fs+0x28c/0x370 fs/super.c:1206
 [<ffffffff815ddad1>] vfs_kern_mount.part.29+0xd1/0x3d0 fs/namespace.c:991
 [<ffffffff815e53f9>] vfs_kern_mount fs/namespace.c:973 [inline]
 [<ffffffff815e53f9>] do_new_mount fs/namespace.c:2513 [inline]
 [<ffffffff815e53f9>] do_mount+0x3c9/0x2740 fs/namespace.c:2835
 [<ffffffff815e814e>] SYSC_mount fs/namespace.c:3051 [inline]
 [<ffffffff815e814e>] SyS_mount+0xfe/0x110 fs/namespace.c:3028
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9f93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/520:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136675c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136675c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425de7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by kworker/0:3/1840:
 #0:  ("events"){.+.+.+}, at: [<ffffffff8118d08e>] work_static include/linux/workqueue.h:186 [inline]
 #0:  ("events"){.+.+.+}, at: [<ffffffff8118d08e>] set_work_data kernel/workqueue.c:617 [inline]
 #0:  ("events"){.+.+.+}, at: [<ffffffff8118d08e>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0:  ("events"){.+.+.+}, at: [<ffffffff8118d08e>] process_one_work+0x6ee/0x1500 kernel/workqueue.c:2085
 #1:  ((&m->wq)){+.+.+.}, at: [<ffffffff8118d0c8>] process_one_work+0x728/0x1500 kernel/workqueue.c:2089
1 lock held by rsyslogd/3676:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d81ec>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3772:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f8142>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211ee22>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142

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

NMI backtrace for cpu 0
CPU: 0 PID: 520 Comm: khungtaskd Not tainted 4.9.113-g47bbcd6 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8b87d08 ffffffff81eb32a9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9bd0 ffff8801d8b87d40
 ffffffff81ebe5a7 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb32a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb32a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebe5a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebe53a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9cd4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366cf4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366cf4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366cf4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366cf4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fa15c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff839f8ba6