bisecting fixing commit since 69b94dd6dcd14d9bfcba35a492f5e27c15cf4d0a
building syzkaller on cb93dc6ac64225e09f44bac6c6cce1dae1b248b0
testing commit 69b94dd6dcd14d9bfcba35a492f5e27c15cf4d0a with gcc (GCC) 8.4.1 20210217
kernel signature: a9b24464f51ef1060446c2648c905c3b9755e8a1caf7052ed6dc63f13a0eb88b
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing current HEAD 4e68c9b0763ff55eaa69d6e519f07515f1c9037b
testing commit 4e68c9b0763ff55eaa69d6e519f07515f1c9037b with gcc (GCC) 8.4.1 20210217
kernel signature: cce02ffe632ec78f0dda3ac247e2f97f73450f5a9e447b670691669d8db8a1fe
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 26m15.816922607s (build: 19m19.23430115s, test: 6m26.176196828s)
the crash still happens on HEAD
commit msg: Linux 4.14.239
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1