bisecting fixing commit since 01364dad1d4577e27a57729d41053f661bb8a5b9
building syzkaller on 78267cec1aaa5e066d66e6a6c76fea1753e51b46
testing commit 01364dad1d4577e27a57729d41053f661bb8a5b9 with gcc (GCC) 8.4.1 20210217
kernel signature: 16f0ba3230964eeaab6bc62e519050f8d9328a5bc697d47aa79a3e0d34187f5c
all runs: crashed: possible deadlock in kcm_ioctl
testing current HEAD cfb41ef9deb1e6572ac218ddfcec9567e5d1c101
testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217
kernel signature: 61dbb1411b8e5190d43d28d1706b233e406f5d6431e247e4deba1b93ec41b365
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 22m6.611001555s (build: 14m59.704529156s, test: 6m18.18239162s)
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