linux-kernel - Re: NFS/TCP crashes on MIPS/RBTX4927 in v4.20-rcX (bisected)

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Message-ID: <CAMuHMdUHxO2aTf+ixnG_U=nzHp85eoPnoqvMUHFP+TJtAL_nEA@mail.gmail.com>
Date:   Fri, 7 Dec 2018 17:19:13 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:     Trond Myklebust <trond.myklebust@...merspace.com>,
        "open list:NFS, SUNRPC, AND..." <linux-nfs@...r.kernel.org>,
        linux-mips@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: NFS/TCP crashes on MIPS/RBTX4927 in v4.20-rcX (bisected)

Hi Nemoto-san,

On Fri, Dec 7, 2018 at 3:51 PM Atsushi Nemoto <anemo@....ocn.ne.jp> wrote:
> On Wed, 5 Dec 2018 14:41:30 +0100, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > My next guess is an unaligned access not using {get,put}_unaligned(), which
> > doesn't seem to work on tx4927, but doesn't cause an exception neither.
>
> IIRC, TX49 can raise an exception on unaligned access.

I thought so, too, but had verified that reading from an unaligned address
didn't raise an exception, but returned a corrupt value instead.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds