bisecting fixing commit since b850307b279cbd12ab8c654d1a3dfe55319cc475
building syzkaller on 6e569755ce2f0efcad474398871ff75693e770fc
testing commit b850307b279cbd12ab8c654d1a3dfe55319cc475 with gcc (GCC) 8.4.1 20210217
kernel signature: e97d610740006b7b32dce3db307389a78300ad808c4bcc7cd0bab13e110fd84c
all runs: crashed: general protection fault in do_con_write
testing current HEAD 96afcb20f36f07683aaa342e592ea8ec76fd1fa6
testing commit 96afcb20f36f07683aaa342e592ea8ec76fd1fa6 with gcc (GCC) 8.4.1 20210217
kernel signature: b13ff003dcd6e4dd5d624550e221ffbedc645b756c0717ea75875386ad0eafa8
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 26m27.398420177s (build: 19m36.224091357s, test: 6m22.744736267s)
the crash still happens on HEAD
commit msg: Linux 4.14.233
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1