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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Message-ID: <CA+i-1C0NADVWC+0tiRTMACqupGpGzK-QZ3sciZq=AYUJL802og@mail.gmail.com>
Date:   Fri, 2 Jul 2021 11:44:06 +0200
From:   Brendan Jackman <jackmanb@...gle.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Sandipan Das <sandipan@...ux.ibm.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Florent Revest <revest@...omium.org>
Subject: Re: [BUG soft lockup] Re: [PATCH bpf-next v3] bpf: Propagate stack
 bounds to registers in atomics w/ BPF_FETCH

On Thu, 1 Jul 2021 at 16:15, Jiri Olsa <jolsa@...hat.com> wrote:
> On Thu, Jul 01, 2021 at 04:32:03PM +0530, Naveen N. Rao wrote:
> > Yes, I think I just found the issue. We aren't looking at the correct BPF
> > instruction when checking the IMM value.
>
> great, nice catch! :-) that fixes it for me..

Ahh, nice. +1 thanks for taking a look!