bisecting fixing commit since ca4f2c56d4162a4a5236f2099b55453fb98296f9
building syzkaller on 0487ea6f5d997a8363eba0d2eb0ea7a925444555
testing commit ca4f2c56d4162a4a5236f2099b55453fb98296f9
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: a6c596c8bc1b6fcbd3da81381c76c667aa3ecc401bd690ea956db750645f3e4e
all runs: crashed: KASAN: use-after-free Read in hci_send_acl
testing current HEAD cd529693461026636f76d0395a42cb2439bbd368
testing commit cd529693461026636f76d0395a42cb2439bbd368
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: c758f00c4ab7c68f2db6417e99588f2012cf4904a1cd262f2d83a5bbf715cde8
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 28m35.339165425s (build: 21m26.87194344s, test: 6m29.735666434s)
the crash still happens on HEAD
commit msg: Linux 4.14.253
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1