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

[Markus Armbruster]

Max Reitz <address@hidden> writes:

> On 2014-11-25 at 14:48, Markus Armbruster wrote:
>> Max Reitz <address@hidden> writes:
>>
>>> On 2014-11-25 at 14:20, Markus Armbruster wrote:
>>>> Max Reitz <address@hidden> writes:
>>>>
>>>>> On 2014-11-25 at 13:21, Markus Armbruster wrote:
>>>>>> Max Reitz <address@hidden> 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

abrt is one of the things I kill with prejudice on all my development
machines.