Date: Tue, 03 Feb 2009 22:15:58 +0800 From: Ganbold <ganbold@micom.mng.net> To: Peter Schuller <peter.schuller@infidyne.com> Cc: pjd@freebsd.org, FreeBSD Current <freebsd-current@freebsd.org>, Rong-en Fan <grafan@gmail.com> Subject: Re: process hang in zfs->io_ ? Message-ID: <4988519E.2070103@micom.mng.net> In-Reply-To: <20090201105815.GA73985@hyperion.scode.org> References: <6eb82e0902010024o4094b3a6q3186f2109029a67a@mail.gmail.com> <20090201105815.GA73985@hyperion.scode.org>
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Peter Schuller wrote: >> I'm running current as of 20080130 on an amd64 box. I can make >> processes stuck in zfs->io_ (output truncated in ddb and top) when I >> make some packages via ports tinderbox. The ports tinderbox access >> local disk via nfs (I also tried nullfs). >> >> ddb output of ps and alltrace can be found at >> >> http://www.rafan.org/FreeBSD/zfs/textdump.zfs.20090130.txt >> >> Any ideas? >> > > A workaround is to disable the ZIL (vfs.zfs.zil_disable="1"), if you > can afford that on the system in question. It will break the > durability of fsync(), but retain it's write barrier semantics. > > Btw, does anyone have a good grasp of the status of this bug? I have > seen vague referenced to it being a memory related deadlock for > example, but that's about it. Is the cause known but difficult to fix, > or just unknown? > I've observed similar system hang when I tried to run svn update on FreeBSD head repo from 2 local directories simultaneously. I might be doing something wrong and as I remember I reproduced it a couple of times. It is i386 CURRENT (r187663M) machine and loader.conf settings are: vm.kmem_size="1024M" vm.kmem_size_max="1024M" vfs.zfs.arc_max="100M" thanks, Ganbold
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