Date: Wed, 25 Jan 2006 13:40:06 -0500 From: "Michael R. Wayne" <wayne@staff.msen.com> To: freebsd-hackers@freebsd.org Subject: Debugging a hanging 5.4 system Message-ID: <20060125184006.GQ64778@manor.msen.com>
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We've got a system running 5.4-RELEASE-p8 that occasionally hangs while dump is running. I suspect it's something to do with the SCSI controller hanging: ahc0: <Adaptec aic7896/97 Ultra2 SCSI adapter> because the machine remains pingable and I can hit <CR> on the serial console and keep getting login prompts until I enter a username at which point the machine ceases to respond. I've compiled a kernel with include GENERIC options ALT_BREAK_TO_DEBUGGER options KDB options DDB in preparation for the last crash. There is a portmaster hooked to the serial port so that I can telnet to it and break to the debugger. Obviously, I will not be able to create a crash dump. My question is what specific DDB commands I should use when the system is hung so that I can generate sufficient information to create a useful PR. Any other hints/tips would also be appreciated. /\/\ \/\/
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