Re: WARNING: refcount bug in sctp_wfree

[Qiujun Huang]

On Mon, Mar 16, 2020 at 11:52 PM Will Deacon <will@xxxxxxxxxx> wrote:
>
> On Tue, Mar 10, 2020 at 09:01:18AM -0700, Kees Cook wrote:
> > On Tue, Mar 10, 2020 at 02:39:01AM -0700, syzbot wrote:
> > > syzbot has bisected this bug to:
> > >
> > > commit fb041bb7c0a918b95c6889fc965cdc4a75b4c0ca
> > > Author: Will Deacon <will@xxxxxxxxxx>
> > > Date:   Thu Nov 21 11:59:00 2019 +0000
> > >
> > >     locking/refcount: Consolidate implementations of refcount_t
> >
> > I suspect this is just bisecting to here because it made the refcount
> > checks more strict?
>
> Yes, this is the commit that enables full refcount checking for all
> architectures unconditionally, so it's the canary in the coalmine rather
> than the source of the problem.

Yes, I tracked it down. And sent out a fix:
https://lore.kernel.org/netdev/1584330804-18477-1-git-send-email-hqjagain@xxxxxxxxx

>
> Will