Re: KASAN: null-ptr-deref Write in rxrpc_unuse_local

[syzbot]

syzbot has bisected this bug to:

commit 5c2833938bf50d502586e16b9dad1e3cf88fda6f
Author: David Howells <dhowells@xxxxxxxxxx>
Date:   Wed Jul 31 15:26:05 2019 +0000

    rxrpc: Fix local endpoint refcounting

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1519a11c600000
start commit:   87b983f5 Add linux-next specific files for 20190809
git tree:       linux-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=1719a11c600000
console output: https://syzkaller.appspot.com/x/log.txt?x=1319a11c600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=28eea330e11df0eb
dashboard link: https://syzkaller.appspot.com/bug?extid=20dee719a2e090427b5f
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17ceae36600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10ebc40e600000

Reported-by: syzbot+20dee719a2e090427b5f@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 5c2833938bf5 ("rxrpc: Fix local endpoint refcounting")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection