bisecting fixing commit since 69b94dd6dcd14d9bfcba35a492f5e27c15cf4d0a
building syzkaller on 340ea5301c27db4a3678f13acc430e04706a0cc6
testing commit 69b94dd6dcd14d9bfcba35a492f5e27c15cf4d0a with gcc (GCC) 8.4.1 20210217
kernel signature: d0362daffb79ab95c8dd4b59135c58b6da4b29daa4192591e51c70b8fc17aa9d
all runs: crashed: divide error in fbcon_switch
testing current HEAD 96afcb20f36f07683aaa342e592ea8ec76fd1fa6
testing commit 96afcb20f36f07683aaa342e592ea8ec76fd1fa6 with gcc (GCC) 8.4.1 20210217
kernel signature: f182e60dc0122cf3063f8e1c7b908c2daf1254046a293fb442e8adcdb5866b7d
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 26m24.464692185s (build: 19m21.218441502s, test: 6m36.836667108s)
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