bisecting fixing commit since 69b94dd6dcd14d9bfcba35a492f5e27c15cf4d0a
building syzkaller on 340ea5301c27db4a3678f13acc430e04706a0cc6
testing commit 69b94dd6dcd14d9bfcba35a492f5e27c15cf4d0a
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: b198dfea256c69a510a6ed17c82ec5c4f7f9be842ffd340b21c90299a5213e9f
all runs: crashed: divide error in fbcon_switch
testing current HEAD 8ee0807eedf3bc60c8a47a7dd95387102bcfd063
testing commit 8ee0807eedf3bc60c8a47a7dd95387102bcfd063
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: e6e0885819a4aeb09b7d6b793a469b0c72cb9fca9fe9d27d2a4ecb0519fabae5
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 26m21.225085347s (build: 19m18.18410177s, test: 6m26.536514527s)
the crash still happens on HEAD
commit msg: Linux 4.14.259
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1