bisecting fixing commit since ca4f2c56d4162a4a5236f2099b55453fb98296f9
building syzkaller on 0487ea6f5d997a8363eba0d2eb0ea7a925444555
testing commit ca4f2c56d4162a4a5236f2099b55453fb98296f9 with gcc (GCC) 8.4.1 20210217
kernel signature: bf6982c2c6be89e70c9efbbc0a3157a59a327682390a945f203d3ffe63379597
all runs: crashed: KASAN: use-after-free Read in vlan_dev_get_iflink
testing current HEAD 3d3abdc8ebd3c3082e4398fc73ceb4c852b66e85
testing commit 3d3abdc8ebd3c3082e4398fc73ceb4c852b66e85 with gcc (GCC) 8.4.1 20210217
kernel signature: 7c3b2192804f5ec05db01838e27841350f1e5678b78326ba7512aec98a4cf6c4
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 30m20.150763062s (build: 22m35.282949323s, test: 7m6.890728505s)
the crash still happens on HEAD
commit msg: Linux 4.14.236
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1