Re: Disable -lmcheck when Python has threads (Re: [BUG] gdb crash when "python import gtk")

Khoo Yit Phang
2012-08-30T16:11:31Z

Hi,

Here's the corresponding bug report for glibc stating that it is by design: http://sourceware.org/bugzilla/show_bug.cgi?id=9939

Yit
August 30, 2012

On Aug 30, 2012, at 12:08 PM, Khoo Yit Phang wrote:

> Hi,
>
> On Aug 30, 2012, at 12:04 PM, Jan Kratochvil wrote:
>
>> Hi,
>>
>> On Thu, 30 Aug 2012 18:00:46 +0200, Khoo Yit Phang wrote:
>>> I ran into a similar issue as below and tracked it down: the "memory
>>> clobbered before allocated block" (and other related messages) because
>>> -lmcheck is not thread safe, and triggers spuriously when threads are used
>>> in Python (e.g., the "gtk" module).
>>
>> this needs some references to glibc/gtk/python maintainers statements etc.
>>
>> -lmcheck is AFAIK thread safe in glibc itself.
>
> -lmcheck is definitely not thread safe, at least as of glibc 2.13 (Ubuntu 11.04). See the first answer of http://stackoverflow.com/questions/314931/glibcs-lmcheck-option-and-multithreading.
>
> Yit
> August 30, 2012