Tracking down LORs

Scott Long scottl at
Thu Aug 19 15:53:35 PDT 2004

Roman Kurakin wrote:
> Hi,
>     Currently I am trying to track down a couple of LORS
> in my code. But it seems that I do not undestand smth or all
> things id realy so bad.
>     So I want to ask some questions to find out if my thoughts
> correct or wrong.
> 1. If I am right LOR means that we have at least two mutexs.
> Lets call them a and b. If we set a, then b in first case
> and b then a in second we could get dead loop, and thus LOR.


> 2. If I have some driver that have mutex a, and we have some
> sytem code that could call this driver with Giant (b), we would
> get LOR if driver lock a and some other part of system will
> try to lock Giant?

The general rule is that NO other locks should be held when Giant
is grabbed.


More information about the freebsd-current mailing list