bisecting fixing commit since 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
building syzkaller on 749688d22abef3f3cb9a0480e15c19a3f2ed8e13
testing commit 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 389d3f98f9f8223ac93269b32ccb42aa72f3285f0e1d1c019eb79da562c67810
all runs: crashed: WARNING in ipvlan_unregister_nf_hook
testing current HEAD ed99bf0e81b558df39f7db2fa96d0228be4198c6
testing commit ed99bf0e81b558df39f7db2fa96d0228be4198c6
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: a085c3304842bcbe8f002a41b5555cce36b2d2d96a570a800ebddbba028229d0
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 27m50.644852048s (build: 18m39.334126602s, test: 8m13.752740511s)
the crash still happens on HEAD
commit msg: Linux 4.14.250
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1