bisecting fixing commit since 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
building syzkaller on 749688d22abef3f3cb9a0480e15c19a3f2ed8e13
testing commit 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 29e33059ceaa81c0013aed1ab3d91fb036855fa8b9808b54f70b5f5f9eebab7b
all runs: crashed: KASAN: use-after-free Read in xfrm6_tunnel_destroy
testing current HEAD 0447aa205abe1c0c016b4f7fa9d7c08d920b5c8e
testing commit 0447aa205abe1c0c016b4f7fa9d7c08d920b5c8e
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 08ae281306f3195f23e35cf70d78c858e222a012b14bab07462e07b8c4b54b8f
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 33m8.35251819s (build: 19m10.461107502s, test: 12m55.650688291s)
the crash still happens on HEAD
commit msg: Linux 4.14.254
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1