ZFS crashes on heavy threaded environment

[Xin LI]

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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.

Cheers,
- --
Xin LI <delphij at delphij.net>	http://www.delphij.net/
FreeBSD - The Power to Serve!
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