strange kernel messages..
Simon Barner
barner at in.tum.de
Wed Aug 4 06:54:39 PDT 2004
Roberto Nunnari wrote:
> Hello.
>
> Please send replies also to my mailbox, as I'm not on this list.
>
> Can anybody tell me what are these messages about? Are them
> just informational or do I have to worry?
>
> Aug 2 18:23:59 web kernel: lock order reversal
> Aug 2 18:23:59 web kernel: 1st 0xc07066e0 UMA lock (UMA lock) @
> /usr/src/sys/vm/uma_core.c:1200
> Aug 2 18:23:59 web kernel: 2nd 0xc0c31100 system map (system map) @
> /usr/src/sys/vm/vm_map.c:2210
> Aug 2 19:12:21 web kernel: lock order reversal
> Aug 2 19:12:21 web kernel: 1st 0xc8c1c39c vm object (vm object) @
> /usr/src/sys/vm/swap_pager.c:1323
> Aug 2 19:12:21 web kernel: 2nd 0xc0705b80 swap_pager swhash (swap_pager
> swhash) @ /usr/src/sys/vm/swap_pager.c:1838
> Aug 2 19:12:21 web kernel: 3rd 0xc6853108 vm object (vm object) @
> /usr/src/sys/vm/uma_core.c:873
This is a so-called lock order reversal (LOR). To learn more about LORs
in general and specifically about the one you are seeing, please see
here:
http://sources.zabbadoz.net/freebsd/lor.html --> # 007
Simon
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