bisecting fixing commit since 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
building syzkaller on 749688d22abef3f3cb9a0480e15c19a3f2ed8e13
testing commit 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: fc4e7415ab5954f30749350308aeb1eda76e4dd5fd9c55967e12446a6090dfc5
all runs: crashed: WARNING in ipvlan_unregister_nf_hook
testing current HEAD 0447aa205abe1c0c016b4f7fa9d7c08d920b5c8e
testing commit 0447aa205abe1c0c016b4f7fa9d7c08d920b5c8e
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 2935ff3edfd20c3938f6e401be9d93bebb3a66127a3c0689726f9d833a1c8386
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 22m38.845602326s (build: 15m17.635307887s, test: 6m29.621396432s)
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