Date: Mon, 20 Jul 2009 22:13:32 +0200 From: Peter Schuller <peter.schuller@infidyne.com> To: freebsd-current@freebsd.org Subject: Getting crashdumps to work (trying to submit crash report) Message-ID: <20090720201332.GA95896@hyperion.scode.org>
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--HcAYCG3uE/tztfnV Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hello, Short version: Is there a list of reasons why crashdumps might not work? I have dumpdev on a plain (non-gmirror/non-gstripe/etc) device that is equal to RAM size, but I am not getting a dump for unknown reasons. Long version: so a few months ago I started seeing page faults and/or VM page related panics while bulk-building ports. I was updating CURRENT every month or so a the time and using the bulk building as a test case for ZFS stability issues. While I have stopped seeing deadlocks and such, which is presumably due to the fixes taht have gone in, I instead started seeing these crashes. I never got crash dumps and didn't know why, and was hoping to wait it out a bit. With the advent of 8.0 BETA1 I wanted to give it another shot. I finally realized that having the dumpdev on gstripes/gmirrors was not supported, so I reconfigured my system with a dumpdev on a plain device. I also manually ran the dumpdev command. After I finally made the box crash again (of course the *one* time I had hoped to have proper dumpdev configuration it took several days), I still don't have a dump, and I really don't know why. Is there a checklist of things that need to be correct in order for the kernel to do a dump? Are there certain forms of panic where a dump won't be attempted (such as in this case where it was some a VM page insert or similar)? The problem is that I cannot get a stacktrace interactively since the USB keyboard won't work after a panic, so I really want a crashdump. But since it takes at least a day often, possibly several days, to trigger the crash I'm running out of time if I am to produce some kind of report before 8.0... --=20 / Peter Schuller PGP userID: 0xE9758B7D or 'Peter Schuller <peter.schuller@infidyne.com>' Key retrieval: Send an E-Mail to getpgpkey@scode.org E-Mail: peter.schuller@infidyne.com Web: http://www.scode.org --HcAYCG3uE/tztfnV Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (FreeBSD) iEYEARECAAYFAkpkz+sACgkQDNor2+l1i33+bwCeLbD4Ih2cR/vTaUD+6YBzOUoD xJUAoLEKBJXiFrlMmx28FMSEooMMaFCu =YQcc -----END PGP SIGNATURE----- --HcAYCG3uE/tztfnV--
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