bisecting fixing commit since 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
building syzkaller on 749688d22abef3f3cb9a0480e15c19a3f2ed8e13
testing commit 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 9e254738cb2ea814a84d9a88ed36a48aa558ec863653374fbed6af30316c568e
all runs: crashed: WARNING in ipvlan_unregister_nf_hook
testing current HEAD f96eb53cbd76415edfba99c2cfa88567a885a428
testing commit f96eb53cbd76415edfba99c2cfa88567a885a428
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 563f30e9879d4b794ff9b32ef1f71cc9d0d558349867110397453cf8f7a24c91
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 29m35.376429562s (build: 21m36.510785146s, test: 6m36.630730047s)
the crash still happens on HEAD
commit msg: Linux 4.14.246
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1