netdev - Re: [BUG bpf-next] bpf/net: Hitting gpf when running selftests

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Message-ID: <37423e512767dd10f4ac427923d0c6a38a9f2474.camel@gmail.com>
Date: Thu, 31 Aug 2023 18:43:10 +0300
From: Eduard Zingerman <eddyz87@...il.com>
To: Xu Kuohai <xukuohai@...wei.com>, Jiri Olsa <olsajiri@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>,  Andrii Nakryiko <andrii@...nel.org>,
 netdev@...r.kernel.org, bpf@...r.kernel.org, Martin KaFai Lau
 <kafai@...com>,  Song Liu <songliubraving@...com>, Yonghong Song
 <yhs@...com>, John Fastabend <john.fastabend@...il.com>, KP Singh
 <kpsingh@...omium.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo
 <haoluo@...gle.com>, Hou Tao <houtao1@...wei.com>
Subject: Re: [BUG bpf-next] bpf/net: Hitting gpf when running selftests

On Thu, 2023-08-31 at 23:34 +0800, Xu Kuohai wrote:
> On 8/31/2023 11:03 PM, Eduard Zingerman wrote:
> > On Thu, 2023-08-31 at 13:52 +0300, Eduard Zingerman wrote:
> > > On Wed, 2023-08-30 at 23:07 +0200, Jiri Olsa wrote:
> > > > On Wed, Aug 30, 2023 at 08:58:11PM +0200, Jiri Olsa wrote:
> > > > > hi,
> > > > > I'm hitting crash below on bpf-next/master when running selftests,
> > > > > full log and config attached
> > > > 
> > > > it seems to be 'test_progs -t sockmap_listen' triggering that
> > > 
> > > Hi,
> > > 
> > > I hit it as well, use the following command to reproduce:
> > > 
> > >    for i in $(seq 1 100); do \
> > >      ./test_progs -a 'sockmap_listen/sockmap VSOCK test_vsock_redir' \
> > >      | grep Summary; \
> > >    done
> > > 
> > 
> > For what its worth, bisect points to the following commit:
> > 147f3efaa241 ("sched/fair: Implement an EEVDF-like scheduling policy")
> > 
> > Which was merged into bpf-next 3 days ago as a part of:
> > 3ca9a836ff53 ("Merge tag 'sched-core-2023-08-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")
> > 
> > Scheduling changes uncovered some old race condition?
> > 
> 
> As replied in another mail, I think the issue is introduced by this commit:
> 
> 405df89dd52c ("bpf, sockmap: Improved check for empty queue")

Sorry, missed sibling sub-thread.