bisecting fixing commit since ca4f2c56d4162a4a5236f2099b55453fb98296f9
building syzkaller on 0487ea6f5d997a8363eba0d2eb0ea7a925444555
testing commit ca4f2c56d4162a4a5236f2099b55453fb98296f9
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 077939685bfe0f3c2018fd74c34e199d44b8cb6763553bf1cda54cf75043437b
all runs: crashed: KASAN: use-after-free Read in hci_send_acl
testing current HEAD 501eec4f9e138b958fc7438e7a745c0d6a7c68b3
testing commit 501eec4f9e138b958fc7438e7a745c0d6a7c68b3
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 27878fbb2ab6663211cf4eb8d1ec8c5ba4666445613999bd89337d2988254407
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 32m0.567895471s (build: 24m36.744202823s, test: 6m23.262277503s)
the crash still happens on HEAD
commit msg: Linux 4.14.281
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1