ZFS crashes on heavy threaded environment

Pawel Jakub Dawidek pjd at FreeBSD.org
Mon Nov 17 08:30:20 PST 2008


On Thu, Nov 13, 2008 at 06:53:41PM -0800, Xin LI wrote:
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> Xin LI wrote:
> > Hi, Pawel,
> > 
> > We can still reproduce the ZFS crash (threading+heavy I/O load) on a
> > fresh 7.1-STABLE build, in a few minutes:
> > 
> > /usr/local/bin/iozone -M -e -+u -T -t 128 -S 4096 -L 64 -r 4k -s 30g -i
> > 0 -i 1 -i 2 -i 8 -+p 70 -C
> > 
> > I have included a backtrace output from my colleague who has his hands
> > on the test environment.  Should there is more information necessary
> > please let us know and we wish to provide help on this.
> 
> Further datapoint.  The system used to run with untuned loader.conf, and
> my colleague just reported that with the following loader.conf, the
> problem can be triggered sooner:
> 
> vm.kmem_size_max=838860800
> vm.kmem_size_scale="2"
> 
> The system is running FreeBSD/amd64 7.1-PRERELEASE equipped with 8GB of
> RAM with GENERIC kernel.

With new ZFS I get:

Memory allocation failed:: Cannot allocate memory

Is this expected?

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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