bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75
building syzkaller on 28ac5c9e93a44c3eb145195ffb55591be58ef510
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: ae7269d4f8577462903d15e655f43f55fffb60fb5854d8eaeaaff141e2fa3370
run #0: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #1: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #2: crashed: KASAN: use-after-free Read in l2cap_chan_put
run #3: crashed: BUG: corrupted list in l2cap_chan_put
run #4: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #5: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #6: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #7: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #8: crashed: BUG: corrupted list in l2cap_chan_put
run #9: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #10: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #11: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #12: crashed: BUG: corrupted list in l2cap_chan_put
run #13: crashed: BUG: corrupted list in l2cap_chan_put
run #14: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #15: crashed: BUG: corrupted list in l2cap_chan_put
run #16: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #17: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #18: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #19: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
testing current HEAD 84bae26850e3b384a45f0f9a5f8b3b5983afacd8
testing commit 84bae26850e3b384a45f0f9a5f8b3b5983afacd8
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 8f36ed520a0b841aa7f3806a762b650b44fb00e9560295d5dbf3a2bc5f8c495f
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 42m30.769991352s (build: 29m3.063131881s, test: 12m46.721931442s)
the crash still happens on HEAD
commit msg: Linux 4.14.284
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1