kqueue LOR

[Kostik Belousov]

On Fri, Sep 07, 2007 at 11:49:50AM -0700, Maxim Sobolev wrote:
> Hi,
> 
> On my 6.2 system I am seeing LOR discussed almost 1 year ago here:
> 
> http://lists.freebsd.org/pipermail/freebsd-stable/2006-November/031048.html
> http://lists.freebsd.org/pipermail/freebsd-stable/2006-December/031197.html
> 
> lock order reversal:
>  1st 0xc52cb500 kqueue (kqueue) @ kern/kern_event.c:1547
>  2nd 0xc4e4d80c struct mount mtx (struct mount mtx) @ 
> ufs/ufs/ufs_vnops.c:138
> 
> Do you have any plans to commit the suggested fix?
I suspect that the LOR is bogus. I was never able to get the information
where the reverse lock order happen. What I asked of the most reporters is
to apply sys/kern/subr_witness.c rev. 1.222 to RELENG_6 and provide me
with the LOR report, if any.

Note that doing that on RELENG_6_2 makes no sense, most likely you will
get LORs with cdev mutex, fixed in RELENG_6.
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