bisecting fixing commit since ca4f2c56d4162a4a5236f2099b55453fb98296f9
building syzkaller on 0487ea6f5d997a8363eba0d2eb0ea7a925444555
testing commit ca4f2c56d4162a4a5236f2099b55453fb98296f9
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 2ccbe61eabef4d78fe899921cf9bcc2e2994141e4be6c0cf46c3473b62be1585
all runs: crashed: KASAN: use-after-free Read in vlan_dev_get_iflink
testing current HEAD 74766a973637a02c32c04c1c6496e114e4855239
testing commit 74766a973637a02c32c04c1c6496e114e4855239
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 73e09e4670a724a926143713eb7b95e6c087d2d472f813fa67f54a608249a71f
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 24m51.654794334s (build: 17m8.203458118s, test: 6m57.348255668s)
the crash still happens on HEAD
commit msg: Linux 4.14.275
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1