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Date: Mon, 22 Aug 2011 10:29:11 -0500
From: Ryan Harper <ryanh@us.ibm.com>
Message-ID: <20110822152911.GT5792@us.ibm.com>
References: <20110821222547.GA22046@lst.de> <20110822145916.GS5792@us.ibm.com>
	<20110822151208.GB4130@lst.de>
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In-Reply-To: <20110822151208.GB4130@lst.de>
Subject: Re: [Qemu-devel] [PATCH 0/3] better I/O accounting V2
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To: Christoph Hellwig <hch@lst.de>
Cc: Ryan Harper <ryanh@us.ibm.com>, qemu-devel@nongnu.org

* Christoph Hellwig <hch@lst.de> [2011-08-22 10:16]:
> On Mon, Aug 22, 2011 at 09:59:16AM -0500, Ryan Harper wrote:
> > * Christoph Hellwig <hch@lst.de> [2011-08-21 17:27]:
> > > changes since V1:
> > >  - rebase to apply against the current qemu.git tree
> > 
> > 
> > Testing on tip + this series with:
> > 
> > ./configure --enable-debug --enable-kvm --enable-io-thread --target-list=x86_64-softmmu
> 
> That is about the same config that I run.
> 
> > [New Thread 0x7ffff4f27700 (LWP 18033)]
> > 
> > Program received signal SIGSEGV, Segmentation fault.
> > 0x00000000004200c1 in bdrv_acct_done (bs=0x12310b0, cookie=0x1c69f50) at /root/git/qemu/block_int.h:239
> > 239         bs->nr_bytes[cookie->type] += cookie->bytes;
> 
> I can't see how this can result in a segfault, unless we get a corrupted
> cookie.  Can you print what cookie->type is from gdb?


(gdb) frame 0
#0  0x00000000004200c1 in bdrv_acct_done (bs=0x12310b0, cookie=0x1c68810) at /root/git/qemu/block_int.h:239 239         bs->nr_bytes[cookie->type] += cookie->bytes;
(gdb) p *cookie
$3 = {bytes = 72057589759737855, start_time_ns = 72057589759737855, type = 16777215}


-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
ryanh@us.ibm.com