bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75
building syzkaller on f721e4a097714a9054b9fe1aadf427afbbd2c157
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 155a97925f4ca22a5ac164ab746d3972afe5f634a227dbb13762221100c8cc0b
run #0: crashed: KASAN: use-after-free Read in lock_sock_nested
run #1: crashed: KASAN: use-after-free Read in lock_sock_nested
run #2: crashed: KASAN: use-after-free Read in lock_sock_nested
run #3: crashed: KASAN: use-after-free Read in lock_sock_nested
run #4: crashed: KASAN: use-after-free Read in lock_sock_nested
run #5: crashed: KASAN: use-after-free Read in lock_sock_nested
run #6: crashed: KASAN: use-after-free Read in lock_sock_nested
run #7: crashed: KASAN: use-after-free Read in lock_sock_nested
run #8: crashed: KASAN: use-after-free Read in lock_sock_nested
run #9: crashed: KASAN: use-after-free Read in lock_sock_nested
run #10: crashed: KASAN: use-after-free Read in lock_sock_nested
run #11: crashed: KASAN: use-after-free Read in lock_sock_nested
run #12: crashed: KASAN: use-after-free Read in lock_sock_nested
run #13: crashed: KASAN: use-after-free Read in lock_sock_nested
run #14: crashed: KASAN: use-after-free Read in lock_sock_nested
run #15: crashed: KASAN: use-after-free Read in lock_sock_nested
run #16: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #17: crashed: KASAN: use-after-free Read in lock_sock_nested
run #18: crashed: KASAN: use-after-free Read in lock_sock_nested
run #19: crashed: KASAN: use-after-free Read in lock_sock_nested
testing current HEAD 964f3712e6a7447d9d3203f2be3f6c50e78ea179
testing commit 964f3712e6a7447d9d3203f2be3f6c50e78ea179
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 9252293131374620f66fcfa44db9da2fc7d7c80b8000380a2ec0dd41795c49ef
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 26m45.511269039s (build: 17m18.2331651s, test: 8m51.513250592s)
the crash still happens on HEAD
commit msg: Linux 4.14.240
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1