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

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Message-Id: <20181207.235141.2138062629640003368.anemo@mba.ocn.ne.jp>
Date:   Fri, 07 Dec 2018 23:51:41 +0900 (JST)
From:   Atsushi Nemoto <anemo@....ocn.ne.jp>
To:     geert@...ux-m68k.org
Cc:     trond.myklebust@...merspace.com, linux-nfs@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: NFS/TCP crashes on MIPS/RBTX4927 in v4.20-rcX (bisected)

On Wed, 5 Dec 2018 14:41:30 +0100, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> When using these options, I do see a slowdown in early boot, but the issue
> is still there.

Hmm, the NIC of the board is NE2000 variants, so DMA coherency will
not be an issue anyway.  So strange ...

The board has a PCI slot.  If you had an legacy PCI NIC card, trying
with it might help finding the bug.

> 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.

---
Atsushi Nemoto