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    SubjectRe: still nfs problems [Was: Linux 2.6.37-rc8]
    On 01/05/2011 03:53 PM, Trond Myklebust wrote:
    > On Wed, 2011-01-05 at 14:40 +0100, Uwe Kleine-König wrote:
    >> Hi Russell,
    >> On Wed, Jan 05, 2011 at 11:27:01AM +0000, Russell King - ARM Linux wrote:
    >>> On Wed, Jan 05, 2011 at 12:05:17PM +0100, Uwe Kleine-König wrote:
    >>>> Hello Trond,
    >>>> On Wed, Jan 05, 2011 at 09:40:14AM +0100, Uwe Kleine-König wrote:
    >>>>> On Mon, Jan 03, 2011 at 07:22:38PM -0500, Trond Myklebust wrote:
    >>>>>> The question is whether this is something happening on the server or the
    >>>>>> client. Does an older client kernel boot without any trouble?
    >>>>> I will set up a boot test with 2.6.37 (for statistics) and 2.6.36 to
    >>>>> compare with. If you don't consider .36 to be old enough let me now.
    >>>>> Once the setup is done it should be easy to test .35 (say), too.
    >>>> Marc (cc'd) saw similar[1] problems with .37, when using .36.2 the
    >>>> problems didn't occur. This was more reliable to trigger and he was so
    >>>> kind to bisect the problem.
    >>>> When testing v2.6.36-rc3-51-gafa8ccc init hanged.
    >>>> (babddc72a9468884ce1a23db3c3d54b0afa299f0 is the first bad commit with
    >>>> this hang.) Commit 56e4ebf877b6043c289bda32a5a7385b80c17dee makes the
    >>>> "init hangs" problem the "fileid changed on tab" problem.
    >>>> I could only reproduce that on armv5 machines (imx27, imx28 and at91)
    >>>> but not on armv6 (imx35).
    >>> FYI, I've seen the "fileid changed" problem, and it looked like a 32-bit
    >>> truncation of the fileid. It occurred several times on successive
    >>> reboots, so I tried to capture a tcpdump trace off the server (Linux
    >>> 2.6.23-rc8-ga64314e6 - its ancient because I've had issues with buggy
    >>> IDE drivers trying to move it forward.) However, for the last couple
    >>> of weeks I've been unable to reproduce it.
    >>> The client was based on 2.6.37-rc6.
    >>> The "fileid changed" messages popped up after mounting an export with
    >>> 'nolock,intr,rsize=4096,soft', and then trying to use bash completion
    >>> and 'ls' in a few subdirectories - and entries were missing from the
    >>> directory lists without 'ls' reporting any errors (which I think is bad
    >>> behaviour in itself.)
    >> There was a bug in at least -rc5[1] that was considered already fixed in
    >> -rc4[2]. The later announcements didn't mention it anymore.
    >>> I don't know why it's stopped producing the errors, although once it
    >>> went I never investigated it any further (was far too busy trying to
    >>> get AMBA DMA support working.)
    >> It seems it was fixed for most users though. Trond?
    > As I said, I can't reproduce it.
    > I'm seeing a lot of mention of ARM above. Is anyone seeing this bug on
    > x86, or does it appear to be architecture-specific?

    It _seems_ to be ARMv5 specific[1]. Uwe did some tests and figured out
    that disabling dcache on ARMv5 "fixes" the problem, but

    [1] Uwe fails to reproduce it on ARMv6. The ARMv6 has a L2 cache and
    uses IIRC different instructions to flush the L1 caches. (please correct
    me, if I'm wrong, ARM guys :)

    cheers, Marc

    Pengutronix e.K. | Marc Kleine-Budde |
    Industrial Linux Solutions | Phone: +49-231-2826-924 |
    Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
    Amtsgericht Hildesheim, HRA 2686 | |

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