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    SubjectRe: BUG: soft lockup detected on Phenom with Debian 2.6.24-4
    Laurent,

    you may have triggered the L2 eviction bug (E298).

    Please try

    hexdump -s 0xc0010015 -n 8 -C /dev/cpu/0/msr

    Output is little-endian, so the left-most byte must have bit 3 enabled meaning
    TLB caching is disabled.

    -Peter

    Laurent GUERBY schrieb:
    > On Sun, 2008-03-16 at 15:43 +0100, Laurent GUERBY wrote:
    >> On Sat, 2008-03-08 at 23:00 +0100, Laurent GUERBY wrote:
    >>> Hi,
    >>>
    >>> I have a system with an "AMD64 Phenom 9500" quad core cpu, 4GB RAM,
    >>> "ASUS M3A32 MVP Deluxe wifi" motherboard with latest vendor BIOS
    >>> (0801).
    >>>
    >>> I tried stock debian etch kernel (Debian 2.6.18.dfsg.1-18etch1),
    >>> machine
    >>> froze with no message, debian etch backport kernel same, and then
    >>> Debian 2.6.24-4 from unstable and I got some messages: machine
    >>> is not frozen but some userland processes are (ps says "Dl" state
    >>> with child in "Zs" state) and "events/3" is taking 100% cpu
    >>> according to top:
    >>>
    >>> 18 root 15 -5 0 0 0 R 100 0.0 74:59.46
    >>> events/3
    >>>
    >>> Got to the same state with ubuntu hardy 2.6.24-8-server kernel. All
    >>> kernels are untainted, no X running anyway.
    >>>
    >>> It takes a few hours of doing some stuff, in my case bootstraping or
    >>> testing GCC at -j 4, and then the problem happens.
    >> On 2.6.24-1-amd64 (Debian 2.6.24-4) I got a slightly different
    >> backtrace in /var/log/messages after a few hours of stressing the
    >> machine with compilations, see below. The given process
    >> was stuck and unkillable.
    >>
    >> Any idea on what to do/try?
    >
    > I changed motherboard and went for a (way cheaper but older) ASUS M2A-VM
    > with is based on the AMD 690G chipset with the exact same
    > kernel/phenom/memory/disk/box and installed the latest vendor BIOS
    > (1604). It took longer (25 hours) to get a stuck and unkillable process
    > but it did happen, but I got nothing in /var/log/kern.log this time.
    >
    > In order to rule out a motherboard or memory issue I bought an Athlon X2
    > 4400+ EE and put in replacement of the phenom with the exact same
    > kenel/memory/disk/box and my stress test has been running for 72 hours
    > without any issue so far.
    >
    > So in the end it seems to be a problem specific to phenom 9500 with the
    > linux kernel.
    >
    > Did anyone succeed in getting a stable linux box based on a phenom 9500
    > processor ? "Stable" defined as being able to survive a few days
    > compiling at -j4 (this is for the GCC compile farm after all :).
    >
    > If so I'm interested by the exact motherboard/bios version/kernel
    > version/distro used.
    >
    > As proposed in my first email, ssh root access is possible to my machine
    > (with either motherboard).
    >
    > Thanks in advance,
    >
    > Laurent
    >
    >
    > --
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    >

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