bisecting fixing commit since 69b94dd6dcd14d9bfcba35a492f5e27c15cf4d0a
building syzkaller on 70c104a18f3d409bc6dde950b50258d3d280d99b
testing commit 69b94dd6dcd14d9bfcba35a492f5e27c15cf4d0a with gcc (GCC) 8.4.1 20210217
kernel signature: cfbfc81ea2b43196f4a9f3a6922b6cb25ee4067d142f36850b06801568583650
run #0: crashed: BUG: unable to handle kernel paging request in __alloc_skb
run #1: crashed: BUG: unable to handle kernel paging request in __alloc_skb
run #2: crashed: BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet
run #3: crashed: BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet
run #4: crashed: BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet
run #5: crashed: BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet
run #6: crashed: BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet
run #7: crashed: BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet
run #8: crashed: BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet
run #9: crashed: BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet
run #10: crashed: INFO: rcu detected stall in rtnl_newlink
run #11: crashed: INFO: rcu detected stall in corrupted
run #12: crashed: INFO: rcu detected stall in corrupted
run #13: crashed: INFO: rcu detected stall in corrupted
run #14: crashed: INFO: rcu detected stall in rtnl_newlink
run #15: crashed: INFO: rcu detected stall in rtnl_newlink
run #16: crashed: INFO: rcu detected stall in rtnl_newlink
run #17: crashed: INFO: rcu detected stall in rtnl_newlink
run #18: crashed: INFO: rcu detected stall in rtnl_newlink
run #19: crashed: INFO: rcu detected stall in rtnl_newlink
testing current HEAD 96afcb20f36f07683aaa342e592ea8ec76fd1fa6
testing commit 96afcb20f36f07683aaa342e592ea8ec76fd1fa6 with gcc (GCC) 8.4.1 20210217
kernel signature: fce3294aae7855e64e254874733b0fa7213a68528d1d47f43097b2eb85e10002
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 29m21.885992972s (build: 20m41.36662929s, test: 7m56.932441945s)
the crash still happens on HEAD
commit msg: Linux 4.14.233
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1