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    SubjectRe: 2.6.21-mm2 - 100% CPU on ksoftirqd/1
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    On Wed, 09 May 2007 01:23:22 PDT, Andrew Morton said:
    > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21/2.6.21-mm2/

    Boots up to multiuser mostly OK. However...

    It comes up with a screaming ksoftirqd - usually /1 but one boot had /0.
    Just sitting there, 100% CPU according to 'top'. Tried 'echo t > /proc/sysrq-trigger' to get
    a trace, but it was always running on the other CPU - even after I reniced
    it down to 19 and launched 2 'for(;;)' C programs to suck the cycles. It would
    be failing to get any CPU - until I did the 'echo t' and then it would be
    "running" again. Anybody got any good debugging ideas here?

    Oddly enough, the kernel panic I was seeing at X server shutdown, related to
    -x86_64-mm-reloc64-__pa-and-__pa_symbol-address-space-separation.patch,
    seems to be gone now (not extensively tested - but it did survive one shutdown
    without crashing at a point that *had* been a 100% fatal from -rc5-mm3 to 21-mm1.
    I wish I understood why.

    Replicated with a boot to single-user and an untainted kernel - by that point,
    it was spinning at 100% already.

    Any ideas how to debug this one?

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