bisecting fixing commit since 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
building syzkaller on 749688d22abef3f3cb9a0480e15c19a3f2ed8e13
testing commit 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: ce65ce229ebc324d80f6e1f8a350b7437b52b9264010e5f181ad96683bed3c49
all runs: crashed: WARNING in ipvlan_unregister_nf_hook
testing current HEAD 21ad423fe5210f5aa50bd43f9ae99b655090a227
testing commit 21ad423fe5210f5aa50bd43f9ae99b655090a227
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: f3c39ea12e0a2f98e01d2156123599c4fd8a47bf2a1d70e9e9fdf217dc3b8258
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 27m34.547532423s (build: 19m30.030306306s, test: 7m12.646009316s)
the crash still happens on HEAD
commit msg: Linux 4.14.265
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1