bisecting fixing commit since b98aebd298246df37b472c52a2ee1023256d02e3
building syzkaller on 5ea87a6638e52a94361b26b8576a1605585815fb
testing commit b98aebd298246df37b472c52a2ee1023256d02e3 with gcc (GCC) 8.4.1 20210217
kernel signature: dfdbb410d946c0b9996c8b91c632b6710a08b82774854694faa9bbd502d1af3d
run #0: crashed: general protection fault in kernfs_kill_sb
run #1: crashed: general protection fault in kernfs_kill_sb
run #2: crashed: general protection fault in kernfs_kill_sb
run #3: crashed: general protection fault in kernfs_kill_sb
run #4: crashed: general protection fault in kernfs_kill_sb
run #5: crashed: general protection fault in kernfs_kill_sb
run #6: crashed: general protection fault in kernfs_kill_sb
run #7: crashed: general protection fault in kernfs_kill_sb
run #8: crashed: general protection fault in kernfs_kill_sb
run #9: crashed: general protection fault in kernfs_kill_sb
run #10: crashed: general protection fault in kernfs_kill_sb
run #11: crashed: general protection fault in kernfs_kill_sb
run #12: crashed: general protection fault in kernfs_kill_sb
run #13: crashed: general protection fault in kernfs_kill_sb
run #14: crashed: general protection fault in kernfs_kill_sb
run #15: crashed: general protection fault in vfs_kern_mount
run #16: crashed: general protection fault in kernfs_kill_sb
run #17: crashed: general protection fault in kernfs_kill_sb
run #18: crashed: general protection fault in kernfs_kill_sb
run #19: crashed: general protection fault in kernfs_kill_sb
testing current HEAD 4e68c9b0763ff55eaa69d6e519f07515f1c9037b
testing commit 4e68c9b0763ff55eaa69d6e519f07515f1c9037b with gcc (GCC) 8.4.1 20210217
kernel signature: 88199821f7a86594b8107cab6ff731a3262ce0e47b6950bf9463ffea04d2a84f
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 21m36.976879811s (build: 14m46.815839113s, test: 6m9.265018649s)
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