bisecting fixing commit since b850307b279cbd12ab8c654d1a3dfe55319cc475
building syzkaller on 6e569755ce2f0efcad474398871ff75693e770fc
testing commit b850307b279cbd12ab8c654d1a3dfe55319cc475 with gcc (GCC) 8.4.1 20210217
kernel signature: 1d900e3752fe3b82a335aab10adcd39c87d7d1ec4105fd1bb280decc6342a638
all runs: crashed: general protection fault in do_con_write
testing current HEAD cfb41ef9deb1e6572ac218ddfcec9567e5d1c101
testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217
kernel signature: 5d35f84ca13644ee880896d3430daaccf3545e86bfc7333317d11aae9d4e44cb
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 22m14.03247825s (build: 15m34.595571267s, test: 6m10.417590627s)
the crash still happens on HEAD
commit msg: Linux 4.14.237
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1