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

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Message-ID: <082a6db6838d3aee5ca39eabd35d4da0c9691a0d.camel@gmail.com>
Date: Thu, 31 Aug 2023 18:03:04 +0300
From: Eduard Zingerman <eddyz87@...il.com>
To: 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 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?

[...]