bisecting fixing commit since b850307b279cbd12ab8c654d1a3dfe55319cc475
building syzkaller on eabcced43245881efa7769d938bcaf795ed48742
testing commit b850307b279cbd12ab8c654d1a3dfe55319cc475 with gcc (GCC) 8.4.1 20210217
kernel signature: 1b62c9dbed18a2a990ac098db34ab88dc33e36a25ead8535022e97d6377ad445
run #0: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #1: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #2: crashed: KASAN: use-after-free Read in __ext4_check_dir_entry
run #3: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #4: crashed: KASAN: use-after-free Read in __ext4_check_dir_entry
run #5: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #6: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #7: crashed: KASAN: use-after-free Read in __ext4_check_dir_entry
run #8: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #9: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #10: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #11: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #12: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #13: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #14: crashed: KASAN: out-of-bounds Read in __ext4_check_dir_entry
run #15: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #16: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #17: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #18: OK
run #19: crashed: KASAN: use-after-free Read in __ext4_check_dir_entry
testing current HEAD cfb41ef9deb1e6572ac218ddfcec9567e5d1c101
testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217
kernel signature: 8b43ed7103d7b3b4041979c1adaae81c8542cee9357ba485a1819beb7006d5da
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 27m41.171098016s (build: 15m12.203636647s, test: 12m1.498127742s)
the crash still happens on HEAD
commit msg: Linux 4.14.237
crash: unregister_netdevice: waiting for DEV to become free
can: request_module (can-proto-0) failed.
can: request_module (can-proto-0) failed.
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1