Date: Fri, 30 Nov 2007 02:10:02 GMT From: Antony Mawer <gnats@mawer.org> To: freebsd-rc@FreeBSD.org Subject: Re: conf/118255: savecore never finding kernel core dumps (rcorder problem) Message-ID: <200711300210.lAU2A2i3017886@freefall.freebsd.org>
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The following reply was made to PR conf/118255; it has been noted by GNATS. From: Antony Mawer <gnats@mawer.org> To: bug-followup@FreeBSD.org, koitsu@FreeBSD.org Cc: Subject: Re: conf/118255: savecore never finding kernel core dumps (rcorder problem) Date: Fri, 30 Nov 2007 12:30:17 +1100 There seems to be conflicting information about what constitutes the correct behaviour here. The original 4.4BSD "Unix System Manager's Manual (SMM)", found here: http://docs.freebsd.org/44doc/smm/02.config/paper-6.html Indicates the following (found under the "System dumps" heading): - Kernel dumps write from the end of swap and work backwards - The kernel uses swap from the front and works forward - This way it reduces the chance of swapping overwriting the dump during the boot process until savecore is run This somewhat more modern posting suggests that is still the case: http://unix.derkeiler.com/Mailing-Lists/FreeBSD/stable/2005-11/0703.html However the FreeBSD Developers' Handbook suggests a behaviour that does not match the current reality: http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html#EXTRACT-DUMP Can anyone speak with more authority on this...? --Antony
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