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    SubjectRe: Nasty regression from .27.7 to .27.8: idle samba goes crazy
    Holger Hoffstaette wrote at LKML:
    > On Mon, 08 Dec 2008 08:34:22 +0100, Rafael J. Wysocki wrote:
    >
    >> On Monday, 8 of December 2008, Holger Hoffstaette wrote:
    >>> Hi,
    >>>
    >>> I just encountered a nasty symptom for the second time that has started to
    >>> occur after updating my home server from vanilla 2.6.27.7 to .8 (same
    >>> config).
    >>>
    >>> A while after disconnecting a samba client, the smbd samba server
    >>> process goes crazy and consumes 100% CPU. From that time on it is
    >>> unkillable (kill -9 returns but the process continues to run). The only
    >>> recourse is reboot, which works without problem (i.e. unmounting the
    >>> served filesystems is apparently possible?). I tried to attach to the
    >>> process with gdb but that just hung.
    >>>
    >>> The system is a generic old single-core P4 box with a single SATA drive,
    >>> Gentoo userland and Samba is 3.0.33 (in async mode). The kernel has no
    >>> patches or binary drivers. It has been rock solid before the update and
    >>> shows no other signs of weirdness in logs or otherwise. I downgraded to .7
    >>> for now and will see what happens, but since it worked before I am certain
    >>> that this is a regression in the .8 release.
    >>>
    >>> The only commonality is a log entry by samba that seems to correlate with
    >>> both occurrences:
    >>>
    >>> [2008/12/08 01:02:52, 0] lib/util_sock.c:read_data(534)
    >>> read_data: read failure for 4 bytes to client 192.168.100.128. Error = No route to host
    >>>
    >>> .128 is the Windows client machine (connected via a stable GigE link),
    >>> which I shut down pretty much exactly 30 minutes before that (any 30
    >>> minute timeouts in the kernel/network stack?). Both instances of these log
    >>> entries correlate with the CPU spikes which I noticed in my MRTG graphs.
    >>>
    >>> Any suspects or ideas?
    >>>
    >>> thanks
    >>> Holger
    >>
    >> Please bisect.
    >
    > I would love to try, but this is my "production server" (i.e. I need it
    > for real work) and I'll be traveling the next few days. I will try to
    > bisect after that (if nobody else has any ideas) but will have to make
    > sure the bug is actually reproducible after the timeout - for now I only
    > observed it by accident (via mrtg).
    > In the meantime maybe someone else will observe it as well.
    >
    > thanks
    > Holger
    >

    Added Cc: netdev, readded all other Cc's, quoted in full for netdev.
    Good luck,
    --
    Stefan Richter
    -=====-==--- ==-- -=---
    http://arcgraph.de/sr/


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