bisecting fixing commit since b850307b279cbd12ab8c654d1a3dfe55319cc475
building syzkaller on eabcced43245881efa7769d938bcaf795ed48742
testing commit b850307b279cbd12ab8c654d1a3dfe55319cc475
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: bdc8e19813fb486285af178dd3fc460944ddba3c319ab4792a438de7740b20f2
run #0: crashed: KASAN: use-after-free Read in __ext4_check_dir_entry
run #1: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #2: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #3: crashed: KASAN: use-after-free Read in __ext4_check_dir_entry
run #4: crashed: KASAN: out-of-bounds Read in __ext4_check_dir_entry
run #5: crashed: KASAN: use-after-free Read in __ext4_check_dir_entry
run #6: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #7: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #8: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #9: crashed: KASAN: use-after-free 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: use-after-free Read in __ext4_check_dir_entry
run #13: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #14: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #15: crashed: KASAN: use-after-free Read in __ext4_check_dir_entry
run #16: crashed: KASAN: slab-out-of-bounds Read in __ext4_check_dir_entry
run #17: crashed: KASAN: use-after-free Read in __ext4_check_dir_entry
run #18: OK
run #19: OK
testing current HEAD 8ee0807eedf3bc60c8a47a7dd95387102bcfd063
testing commit 8ee0807eedf3bc60c8a47a7dd95387102bcfd063
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: e90dd7752ae689e3f8ccce686cd02978edb69e97152aab9bcfac58bd2f3fef54
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 39m44.994111266s (build: 26m49.426989321s, test: 12m10.896813258s)
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