Date: Wed, 05 Aug 2015 09:30:28 -1000 From: parv <parv@bitter-almonds.com> To: Ian Lepore <ian@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: 8-stable crashing recently in ufsdirhash Message-ID: <119E4C6D-ABFD-4D82-B353-D3829088233B@bitter-almonds.com> In-Reply-To: <1438783814.70393.138.camel@freebsd.org> References: <ED2C19BC-7F91-420E-B8B9-063AB53D3649@bitter-almonds.com> <1438783814.70393.138.camel@freebsd.org>
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On August 5, 2015 4:10:14 AM HST, Ian L wrote: >On Tue, 2015-08-04 at 23:54 -1000, parv wrote: >> Please CC me as I cannot properly use my laptop, Thinkpad X200 >(i386). >> >> 8-stable has been crashing a lot since source update of Jul 2015[0]. >After building debug kernel, kgdb shows lock reversal order & in >ufsdirhash. File systems (/, var, misc) are all UFS, with var & misc >having soft updates enabled. >> >> Crash had happened just after boot (during mktemp); when I tried to >delete a directory (/misc/obj); when I tried to edit (vi /etc/fstab) so >that / would be mounted readonly. Most recent crash ... >> >> http://imagebin.ca/v/2B50NARvIHsH >> >> Any clue would be appreciated. ... >When you say you built a debug kernel, does that include option >WITNESS_KDB? If so, remove that so you can find the real error. LORs >related to ufs_dirhash have been reported for years, and nobody with >the >appropriate skills seems to be interested in fixing them; they just get >declared to be harmless. I will try that as soon as I can. Currently after every little fs operation, I am thrown in debugger-reboot-fsck cycle. As such I cannot do anything. This is my own damn fault because the non-debug kernel would run for some random but meaningful amount of time before crash & reboot. I tried booting /boot/kernel.old/kernel from boot prompt but that presented debugger soon after boot. BTW is it possible to set kernel.old to boot next time at boot prompt? --
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