I do experience the same problem. Today I had two near hangs.
Running at this time were X, some xterms, less, one make. A usual situation
which has worked for most of the last 100 2.1 developer kernels.
(No changed hardware. No changed configuration, except CONFIG_FB_MATROX
enabled (I have a Matrox Mystique). But the computer was displaying
the XF86_SVGA/Matrox Server, like it did in the last months with older
versions. No changed compiler, no changed libc, no changed tools.)
- The machine was up for half an hour.
- Most applications were still usable. (Mouse moved, Consoles switched,
xterm scrolled, xcpuinfo was still running).
Harddisks were still accessed by applications (including syslog, sync,
emergenyc umount, so no SCSI hang.)
- Applications did not terminate. I terminated the less, it cleared the xterm
but did not return to the shellprompt. Dito the other applications.
- xcpuinfo Load Meter slowly growed to 100% System Time.
- SysRq-showPc showed nearly everytime an EIP within 'schedule()'.
I suspect the scheduler is broken in some cases.
I will try to debug further, but this is rather difficult.
Marcus
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