INIT: Entering runlevel: 2

[info] Using makefile-style concurrent boot in runlevel 2.
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added 'ci-upstream-next-kasan-gce-7,10.128.0.18' (ECDSA) to the list of known hosts.
executing program
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syzkaller login: [  152.289270] device gre0 entered promiscuous mode
[  183.775042] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 31s!
[  183.783226] BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 30s!
[  183.791328] Showing busy workqueues and worker pools:
[  183.796529] workqueue events: flags=0x0
[  183.800567]   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
[  183.806765]     pending: cache_reap
[  183.810413]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
[  183.816551]     pending: vmstat_shepherd, cache_reap
[  183.821668] workqueue events_long: flags=0x0
[  183.826074]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[  183.832208]     pending: gc_worker
[  183.835754] workqueue events_power_efficient: flags=0x80
[  183.841200]   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
[  183.847336]     pending: neigh_periodic_work
[  183.851753]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
[  183.857888]     pending: do_cache_clean, neigh_periodic_work
[  183.863700] workqueue mm_percpu_wq: flags=0x8
[  183.868186]   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
[  183.874324]     pending: vmstat_update
[  183.878222] workqueue writeback: flags=0x4e
[  183.882574]   pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256
[  183.888322]     pending: wb_workfn
[  183.891873] workqueue kblockd: flags=0x18
[  183.896028]   pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=1/256
[  183.902338]     pending: blk_timeout_work
[  183.906510] workqueue ipv6_addrconf: flags=0x40008
[  183.911434]   pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1
[  183.917398]     in-flight: 23:addrconf_dad_work
[  183.922080] pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=30s workers=3 idle: 1284 17