DragonFly users List (threaded) for 2008-06
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Re: HAMMER lockup

From: Gergo Szakal <bastyaelvtars@xxxxxxxxx>
Date: Mon, 30 Jun 2008 20:56:25 +0200

On Mon, 30 Jun 2008 11:45:37 -0700 (PDT)
Matthew Dillon <dillon@apollo.backplane.com> wrote:

> :
> :I could still hang the machine again. I could break into DDB and make
> :photos of the DDB output.
> :
> :http://medica.semi.szote.u-szeged.hu/~szg/100OLYMP.tar
> :
> :(And I'll set up a serial console now. :-D)
> :
> :-- 
> :Gergo Szakal MD <bastyaelvtars@gmail.com>
>     Cool, those are perfect.  It's exactly the same lockup I am
> getting on my test box.  I should be able to fix it today.
>     bufdaemon_hw is stuck in "newbuf" while trying to flush buffers
> through HAMMER.
>     HAMMER is reserving space in the strategy_write() code and must
> also allocate a memory-record to placemark the operation.  This means
> HAMMER must do various getblks and breads.  The buffer cache is
> supposed to have enough clean buffers to satisfy those operations but
> sometimes it doesn't.
> 					-Matt
> 					Matthew Dillon 
> 					<dillon@backplane.com>

(you forgot CC'ing users@)

Thanks, I'll try it out as soon as you commit it.

By the way, for some reason rtorrent is a great filesystem testing
application. There has been an ext3 bug caught with it and I also
caught a bug in FreeBSD's ZFS implementation with rtorrent, and now

Gergo Szakal MD <bastyaelvtars@gmail.com>
University of Szeged, Hungary
Faculty Of General Medicine

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