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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