linux-kernel - Re: [BUG soft lockup] Re: [PATCH bpf-next v3] bpf: Propagate stack bounds to registers in atomics w/ BPF

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Date:   Wed, 30 Jun 2021 14:42:41 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Brendan Jackman <jackmanb@...gle.com>
Cc:     bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Florent Revest <revest@...omium.org>,
        John Fastabend <john.fastabend@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Sandipan Das <sandipan@...ux.ibm.com>
Subject: Re: [BUG soft lockup] Re: [PATCH bpf-next v3] bpf: Propagate stack
 bounds to registers in atomics w/ BPF_FETCH

On Wed, Jun 30, 2021 at 12:34:58PM +0200, Brendan Jackman wrote:
> On Tue, 29 Jun 2021 at 23:09, Jiri Olsa <jolsa@...hat.com> wrote:
> >
> > On Tue, Jun 29, 2021 at 06:41:24PM +0200, Jiri Olsa wrote:
> > > On Tue, Jun 29, 2021 at 06:25:33PM +0200, Brendan Jackman wrote:
> > > > On Tue, 29 Jun 2021 at 18:04, Jiri Olsa <jolsa@...hat.com> wrote:
> > > > > On Tue, Jun 29, 2021 at 04:10:12PM +0200, Jiri Olsa wrote:
> > > > > > On Mon, Jun 28, 2021 at 11:21:42AM +0200, Brendan Jackman wrote:
> 
> > > > > > > atomics in .imm). Any idea if this test was ever passing on PowerPC?
> > > > > > >
> > > > > >
> > > > > > hum, I guess not.. will check
> > > > >
> > > > > nope, it locks up the same:
> > > >
> > > > Do you mean it locks up at commit 91c960b0056 too?
> 
> Sorry I was being stupid here - the test didn't exist at this commit
> 
> > > I tried this one:
> > >   37086bfdc737 bpf: Propagate stack bounds to registers in atomics w/ BPF_FETCH
> > >
> > > I will check also 91c960b0056, but I think it's the new test issue
> 
> So yeah hard to say whether this was broken on PowerPC all along. How
> hard is it for me to get set up to reproduce the failure? Is there a
> rootfs I can download, and some instructions for running a PowerPC
> QEMU VM? If so if you can also share your config and I'll take a look.
> 
> If it's not as simple as that, I'll stare at the code for a while and
> see if anything jumps out.
> 

I have latest fedora ppc server and compile/install latest bpf-next tree
I think it will be reproduced also on vm, I attached my config

jirka

View attachment "config" of type "text/plain" (123499 bytes)