[Mono-dev] malloc error executing OBS-built mono

Miguel de Icaza miguel at xamarin.com
Wed Oct 21 18:44:12 UTC 2015

Hello Miguel,

I also had to apply this change in order to avoid an unallowed warning
> message:
> I: Statement might be overflowing a buffer in strncat. Common mistake:
>    BAD: strncat(buffer,charptr,sizeof(buffer)) is wrong, it takes the
>    left over size as 3rd argument
>    GOOD: strncat(buffer,charptr,sizeof(buffer)-strlen(buffer)-1)

We replaced that code with the glib string operations just yesterday:


But thanks for sharing.

> At this point I’m able to build mono RPM packages and they’re working as I
> install them using a test OpenSUSE 12.3 virtual machine. However, when the
> GTK# builds are started –which use the mono packages as build requirement–,
> the worker is unable to run the mono executable: apparently, malloc is
> corrupting the heap or something. This is a sample execution as extracted
> from the OBS build logs:
> [  101s] + /opt/plasticscm5/mono/bin/mono /opt/plasticscm5/mono/lib/mono/4.5/gacutil.exe -l
> [  101s] *** Error in `/opt/plasticscm5/mono/bin/mono': malloc: top chunk is corrupt: 0x08ab9230 ***
What you want to do at this point in time is to run the process under gdb,
as this will show where malloc detected the error, and then you should get
both the unmanaged stack trace, and if possible the managed one (with the
mono_stack gdb macro)

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