Date: Tue, 2 Mar 2004 23:11:07 -0600 From: Vladimir V Egorin <vladimir@math.uic.edu> To: freebsd-current@freebsd.org Subject: debugging lockups Message-ID: <20040302231107.A964@math.uic.edu>
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I have a FreeBSD-current machine with a system built on Feb 26, 2004. The system hangs hard at seemingly random times. It had the same problem in 5.2 and 5.2.1 releases (but not in 4.8-STABLE) I have tried to investigate this further, as described in the FAQ. I have options DDB options BREAK_TO_DEBUGGER set in the kernel config; the problem is that the system doesn't react to keyboard input (ctrl-alt-esc) after the lockup. X is not running. I can reliably reproduce the problem by starting a process that heavily uses disk and memory (e.g. maple computations, or mencoder), and then killing it. The system locks instantly. I don't believe it's a problem with the hardware at this point: I have tried replacing memory in the machine with no luck, and the system is very stable under heavy loads in 4.8-STABLE. Any suggestions on how to proceed? Do you think I would have more luck with a serial console? Thanks, -- Vladimir
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