LoR in slab allocator and swapper

[Jon Noack]

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.

Jon