bisecting fixing commit since 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
building syzkaller on 749688d22abef3f3cb9a0480e15c19a3f2ed8e13
testing commit 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: b1806abf23ec3f1d76b589ad067d76d9bec7e2b02a022ffe9a2bb0c842e9648e
all runs: crashed: WARNING in ipvlan_unregister_nf_hook
testing current HEAD bfdef05c8da46b022172695aa493cff7ac667a4b
testing commit bfdef05c8da46b022172695aa493cff7ac667a4b
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 867f0d02aa3bdd654f6d8d79ab55b89ce463566597069e86bcf5798a5ecd1ed8
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 30m6.305761078s (build: 22m4.775782317s, test: 6m30.799429211s)
the crash still happens on HEAD
commit msg: Linux 4.14.261
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1