bisecting fixing commit since 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
building syzkaller on 749688d22abef3f3cb9a0480e15c19a3f2ed8e13
testing commit 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: ad09e3e503f5d9a1d7435575fb2d44b58f2b6cde6c7817d5b724667ff96f28e4
all runs: crashed: KASAN: use-after-free Read in xfrm6_tunnel_destroy
testing current HEAD 66722c42ec916e92cadda46316f8f6e3fdcaedc6
testing commit 66722c42ec916e92cadda46316f8f6e3fdcaedc6
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 56697d878ab1a2ad0e52660b94e60dfca2d1ec36b5e9f6277ec1cecfcde05c21
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 37m39.163871146s (build: 24m2.443833901s, test: 12m31.65443629s)
the crash still happens on HEAD
commit msg: Linux 4.14.256
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1