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    SubjectRe: Hang: 2.6.32.4 sky2/DMAR (was [PATCH] sky2: Fix WARNING: at lib/dma-debug.c:902 check_sync)
    On 1/22/2010 6:06 PM, Jarek Poplawski wrote:
    > On Fri, Jan 22, 2010 at 05:14:58PM -0500, Michael Breuer wrote:
    >
    >> On 1/22/2010 4:53 PM, Jarek Poplawski wrote:
    >>
    >>> On Fri, Jan 22, 2010 at 01:01:15PM -0500, Michael Breuer wrote:
    >>>
    >>>> Kernel 2.6.32.4 (git) with the following patches applied:
    >>>>
    >>>> af_packet.c (tpacket_snd version 3)
    >>>> sky2.c pskb_may_pull
    >>>> sky2 fix WARNING at lib/dma-debug.c check_sync
    >>>>
    >>> I guess, you meant the "sky2.c receive_copy" patch which you tested
    >>> earlier, or at least you managed to crash DMAR with that patch
    >>> before crashing it with Stephen's "lib/dma-debug.c check_sync" patch,
    >>> right?
    >>>
    >>>
    >> Yes - sorry, correct - all three patches were in the last run.
    >> Previously, I've encountered the crash without these patches.
    >>
    > OK, thanks for testing - it's really very helpful, and supports
    > David's opinion that dmar is a different problem.
    > ...
    >
    >> Not sure I can do that. Note that based on the log messages, there
    >> were no errors/dropped packets involving dhcp. Moving the dhcp
    >> server off of the affected machine is not trivial. The dhcp
    >> correlation is based on logged messages preceding each crash. I
    >> cannot confirm that they're related, however it's really suspicious.
    >> If it helps, HP replaced my unmanaged switch with a managed one so I
    >> can see whether there were any switch events logged the next time I
    >> have a crash.
    >>
    >> At this point, it seems the following is required to trigger the crash:
    >> 1) Uptime of 24-36 hours
    >> 2) High RX load on server (cifs traffic is what I've triggered it with).
    >> 3) Normal DHCP traffic.
    >>
    > Do you mean you got these crashes with the new switch too, and this
    > switch doesn't drop DHCP at all? (Otherwise, let's try this switch
    > first.)
    >
    > Jarek P.
    >
    Nope - just got the new switch. Crash was old switch. That said, I don't
    think (based on the log messages) that the dhcpoffer packet drop was
    happening prior to the crash. I also can't fathom why a DHCPOFFER packet
    dropped after leaving the server would have any bearing on the issue.


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