AddressSanitizer. (Except on macOS it will not find memory leaks) You should be
able to find the double free quite quickly. You do NOT Have to rebuild Qt with
the address sanitizer flags, just your own codes. We just got done using ASAN
on our own code base and it was able to pinpoint the same kind of issue. The
issue was in our code but it didn't die until deep inside of Qt code which was
never helpful. I'm 100% behind ASAN as an excellent code quality tool. We now
have a nightly CI build with ASAN running to help find new codes that might
have the same issues as before.
--
Mike Jackson
On 9/23/20, 8:56 AM, "Interest on behalf of Ben Haller via Interest"
<interest-boun...@qt-project.org on behalf of interest@qt-project.org> wrote:
Thanks Giuseppe; this looks very interesting. I’d love to be able to run
Valgrind.
Thanks also to Mitch; I see your email now, and it also looks very useful.
To avoid spamming the list with thank-yous, I’ll just say in advance, thanks to
all others who might respond with helpful suggestions. :->
Cheers,
-B.
Benjamin C. Haller
Messer Lab
Cornell University
> On Sep 23, 2020, at 8:41 AM, Giuseppe D'Angelo via Interest
<interest@qt-project.org> wrote:
>
> Il 23/09/20 14:08, Ben Haller via Interest ha scritto:
>> Thanks for the suggestion. However, this problem is only on macOS, and
Valgrind doesn’t appear to run on any macOS later than 10.12 (“preliminary”
support for 10.13, according to their website; I’m not sure what that means).
I’m on macOS 10.15.6, and I’m using Qt 5.14.2 which has a minimum macOS version
of 10.13, so Valgrind seems to be a no-go for at least one reason, perhaps two
reasons (depending on “preliminary”).
>
> There is a fork of Valgrind to support more modern macOS versions
>
> https://github.com/LouisBrunner/valgrind-macos/
>
> (Note: never used it myself, not a mac user).
>
> Another option is getting a recent Clang version and rebuilding Qt and
your app with AddressSanitizer.
>
> HTH,
>
> --
> Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Senior Software Engineer
> KDAB (France) S.A.S., a KDAB Group company
> Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
> KDAB - The Qt, C++ and OpenGL Experts
>
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