Date: Sat, 3 Jul 2004 15:34:13 -0700 (PDT) From: Nate Lawson <nate@root.org> To: Jon Noack <noackjr@alumni.rice.edu> Cc: current@freebsd.org Subject: Re: LoR in slab allocator and swapper Message-ID: <20040703153337.U65630@root.org> In-Reply-To: <40E662D5.8070009@alumni.rice.edu> References: <20040703000302.T58868@root.org> <40E662D5.8070009@alumni.rice.edu>
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On Sat, 3 Jul 2004, Jon Noack wrote: > On 07/03/04 02:04, Nate Lawson wrote: > > Just in case no one has reported this one: > > > > [...] > > lock order reversal > > 1st 0xc1a31108 vm object (vm object) @ /usr/src/sys/vm/swap_pager.c:1313 > > 2nd 0xc08c6300 swap_pager swhash (swap_pager swhash) @ /usr/src/sys/vm/swap_pager.c:1799 > > 3rd 0xc103fce4 vm object (vm object) @ /usr/src/sys/vm/uma_core.c:923 > > Yeah, it's been reported a few dozen times. It's a false positive and > is harmless. See #1 on the LOR status page: > http://sources.zabbadoz.net/freebsd/lor.html > > We're working on getting a new FAQ entry for LORs > (http://www.freebsd.org/cgi/query-pr.cgi?pr=68595) which will have a > pointer to the LOR status page given above. Once this is done, the idea > is to update the lock order reversal message to point to this FAQ entry > so we can better educate users on LORs and eliminate people reporting > the same LOR tons of times. Thanks, that's a good summary. A better thing would be to add this to the static WITNESS ordering so it knows that combination is ok. -Nate
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