Date: Sat, 13 Apr 2002 12:11:42 -0300 (ART) From: Fernando Gleiser <fgleiser@cactus.fi.uba.ar> To: User Tomdean <tomdean@speakeasy.org> Cc: <freebsd-questions@FreeBSD.ORG> Subject: Re: How do I Create a Crash Dump? Message-ID: <20020413120630.J5464-100000@cactus.fi.uba.ar> In-Reply-To: <200204130138.g3D1chF01203@celebris.tddhome>
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On Fri, 12 Apr 2002, User Tomdean wrote: > I have been chasing a problem and have been unable to get a crash > dump. I want to create a dump using ddb and panic. > > So, I break into ddb and enter panic. Then 'call boot(0)' and the > system reboots. The disks were not dismounted. Ok. When the system > reboots, I see: You need to panic twice. The first panic breaks to DDB and the second panics the kernel. > > ... > dumpon: crash dumps to /dev/ad0s2b (116, 196609) > Checking for core dump: dumplo = 570507264 (1114272 * 512) > savecore: magic number mismatch (544c4645 != 8fca0101) > savecore: no core dump See above. The machine rebooted because you told it to do so. If you say panic a second time the kernel will do the crash dump to the dumpdev. Fer > ... > > How do I get past this point? > > I have > makeoptions DEBUG=-g #Build kernel with gdb(1) debug symbols > options DDB #debugger > options BREAK_TO_DEBUGGER #a BREAK on a comconsole goes to > #DDB, if available. > options ALT_BREAK_TO_DEBUGGER > in the kernel config. > > I have > dumpdev="/dev/ad0s2b" # Device name to crashdump to (or NO). > dumpdir="/var/crash" # Directory where crash dumps are to be stored > savecore_flags="-v" # Used if dumpdev is enabled above, and present. > in /etc/rc.conf > > tomdean > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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