bisecting fixing commit since ca4f2c56d4162a4a5236f2099b55453fb98296f9
building syzkaller on 0487ea6f5d997a8363eba0d2eb0ea7a925444555
testing commit ca4f2c56d4162a4a5236f2099b55453fb98296f9 with gcc (GCC) 8.4.1 20210217
kernel signature: 49feafb77ec650d455bca08b421897725c919fb5434b9142067a11cb26341f3e
all runs: crashed: KASAN: use-after-free Read in vlan_dev_get_iflink
testing current HEAD 4e68c9b0763ff55eaa69d6e519f07515f1c9037b
testing commit 4e68c9b0763ff55eaa69d6e519f07515f1c9037b with gcc (GCC) 8.4.1 20210217
kernel signature: 8fb2f2b8b0d988a2a7b1a6e7c428b757053dad07a07421276e0e7ba83fd84d90
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 26m3.000337425s (build: 18m36.59497249s, test: 6m40.451283587s)
the crash still happens on HEAD
commit msg: Linux 4.14.239
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1