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Date: Tue, 25 Nov 2014 13:29:29 +0100
From: Max Reitz <mreitz@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 0/3] iotests: Fix test 039
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To: Markus Armbruster <armbru@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <famz@redhat.com>, =?ISO-8859-15?Q?Michael_M=FCller?= <mimu@linux.vnet.ibm.com>, Mao Chuan Li <maochuan@linux.vnet.ibm.com>, qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@redhat.com>

On 2014-11-25 at 13:21, Markus Armbruster wrote:
> Max Reitz <mreitz@redhat.com> writes:
>
>> Test 039 used to fail
> I'm confused: "used to" suggests it doesn't anymore, but you sending a
> patches strongly suggests something's broken.

Well, it used to fail before this series. :-P

You're right, this sounds bad. Currently, 039 does fail, at least on any 
system with a /proc/sys/kernel/core_pattern passing the dump to another 
program. After this series, it does no longer.

>>                        because qemu-io -c abort may generate core dumps
>> even with ulimit -c 0 (and the output then contains "(core dumped)").
> How?

See the patches[1][2] by Mao Chuan Li. If /proc/sys/kernel/core_pattern 
passes the dump to another program, ulimit -c 0 does not matter.

[1] http://lists.nongnu.org/archive/html/qemu-devel/2014-11/msg02092.html
[2] http://lists.nongnu.org/archive/html/qemu-devel/2014-11/msg02093.html

The problem with those patches is that they require access to 
/proc/sys/kernel/core_pattern. I don't like having to run the iotests as 
root.

Max