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Date: Mon, 22 Aug 2011 17:12:09 +0200
From: Christoph Hellwig <hch@lst.de>
Message-ID: <20110822151208.GB4130@lst.de>
References: <20110821222547.GA22046@lst.de> <20110822145916.GS5792@us.ibm.com>
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Subject: Re: [Qemu-devel] [PATCH 0/3] better I/O accounting V2
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To: Ryan Harper <ryanh@us.ibm.com>
Cc: Christoph Hellwig <hch@lst.de>, qemu-devel@nongnu.org

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?