Date: Sun, 28 Feb 2010 20:56:36 +0000 From: Andrew Brampton <brampton+freebsd@gmail.com> To: freebsd-current@freebsd.org Cc: Attilio Rao <attilio@freebsd.org> Subject: minidump fails on SMP machines Message-ID: <d41814901002281256q6d5eb6ecn38fd5489128e3750@mail.gmail.com>
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Hello, When many interrupts are firing on my amd64 SMP machine, and a panic occurs, dump will fail with the error "Attempt to write outside dump device boundaries". This problem has been discussed before[1][2], and I even filled a PR about it last year[3]. >From what I understand the reason this occurs is because interrupts are not disabled on all cores during the dump. There was even a TODO comment about this in kern_shutdown.c 414 /* XXX This doesn't disable interrupts any more. Reconsider? */ 415 splhigh(); However, looking at my FreeBSD 8.0 and HEAD source, these two lines were removed by commit r196198 by attilio. Now that commit seems to deal with disabling interrupts on other cores, but perhaps not specifically to fix this bug. So my question is, should this dump bug now be fixed? Or should the XXX comment been left in? Or is the dump bug caused by something else? I would appreciate this problem being fixed, as it causes me a lot of headaches when trying to debug my kernel module :(. On a side note, I read that my problem only occurs when using minidump. Is it possible to do a full dump to avoid this problem, if so how? thanks Andrew [1] http://lists.freebsd.org/pipermail/freebsd-current/2008-January/082752.html [2] http://lists.freebsd.org/pipermail/freebsd-current/2008-June/086574.html [3] http://www.freebsd.org/cgi/query-pr.cgi?pr=amd64/139614
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