bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75
building syzkaller on f721e4a097714a9054b9fe1aadf427afbbd2c157
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75 with gcc (GCC) 8.4.1 20210217
kernel signature: ff2cf74135eb8045d78addbae64569dc4a1c8594f011978bcb2f08a0749f92e2
all runs: crashed: KASAN: use-after-free Read in lock_sock_nested
testing current HEAD cfb41ef9deb1e6572ac218ddfcec9567e5d1c101
testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217
kernel signature: cbe07dcb62e05c0ecfd465d3b5be7e1ba18f7de05d29653079e72233cc5b8a28
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 22m3.868973521s (build: 14m3.505322154s, test: 7m37.022271338s)
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