linux-kernel - Re: kernel BUG at net/rxrpc/local

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Message-ID: <22318.1564586386@warthog.procyon.org.uk>
Date:   Wed, 31 Jul 2019 16:19:46 +0100
From:   David Howells <dhowells@...hat.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     dhowells@...hat.com,
        syzbot <syzbot+1e0edc4b8b7494c28450@...kaller.appspotmail.com>,
        Eric Biggers <ebiggers@...nel.org>,
        David Miller <davem@...emloft.net>,
        linux-afs@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: kernel BUG at net/rxrpc/local_object.c:LINE!

Dmitry Vyukov <dvyukov@...gle.com> wrote:

> Please send a patch for testing that enables this tracing
> unconditionally. This should have the same effect. There is no way to
> hook into a middle of the automated process and arbitrary tune things.

I don't know how to do that off hand.  Do you have an example?

Anyway, I think rxrpc_local_processor() is broken with respect to refcounting
as it gets scheduled when usage==0, but that doesn't stop it being rescheduled
again by a network packet before it manages to close the UDP socket.

David