Re: [Qemu-devel] [PATCH 0/3] iotests: Fix test 039

[Max Reitz <mreitz@redhat.com>]

On 2014-11-25 at 14:48, Markus Armbruster wrote:
> Max Reitz <mreitz@redhat.com> writes:
>
>> On 2014-11-25 at 14:20, Markus Armbruster wrote:
>>> Max Reitz <mreitz@redhat.com> writes:
>>>
>>>> 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.
>>> To me, this sounds like a case of "doctor, it hurts when I do this".
>> What do you mean? That I don't want the iotests to run as root? Or
>> that I don't want to go the alternative of filtering out the "(core
>> dumped)" message?
> I mean:
>
>      Doctor, it hurts when I write weird stuff to
>      /proc/sys/kernel/core_pattern.
>
>      Don't do that then.
>
> If you want to be a nicer doc than me, go right ahead.

I don't write weird stuff there. My default system configuration does 
(and mine is not the only one):

$ uname -r
3.17.3-200.fc20.x86_64
$ cat /proc/sys/kernel/core_pattern
|/usr/sbin/chroot /proc/%P/root /usr/libexec/abrt-hook-ccpp %s %c %p %u 
%g %t e

Max