Date: Mon, 10 Aug 2015 14:25:08 -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: <E9B29C00-00DB-4E5C-820F-A8C9AE98491D@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 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/2B50NARvIHs ... >> [0] crash also happened while svn was trying to update source of 8. >>Now "svn log" wants to connect to the remote repo instead of showing >>the current revision. > >When you say you built a debug kernel, does that include option >WITNESS_KDB? Yes; other things wrt "debug kernel" ... options DDB options GDB options KDB options KDB_TRACE #options KDB_UNATTENDED options INVARIANT options INVARIANT_SUPPORT options WITNESS #options WITNESS_KDB options WITNESS_SKIPSPIN > If so, remove that so you can find the real error. Above is the current state (of kernel configuration). >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. Aye. After installing kernel with W*KDB option missing, FreeBSD 8 now runs meaningfully long enough before crash-reboot. Thanks Ian. I will now do binary search which is causing seemingly random crashes. Crashes seem to coincide with network traffic on wlan device (ath). Between Jun 2015 & Jul 23 2015, only changes relevant are apparently related to TCP & openssh. > (IMO the spewage related to this makes >witness >essentially useless.) Is there any point then in keeping even plain WITNESS option? --
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