[Interest] Will TSAN_OPTIONS=detect_deadlocks=1 work when Qt is compiled with -sanitize thread?

[Nuno Santos]

Dennis,
Robert,

One more question.

When using thread sanitiser in the MacOS version I can only see "SUMMARY: ThreadSanitizer: data race”. A lot of them.

Can data race cause deadlocks?

Or should I explicitly look for deadlock: "lock-order-inversion (potential deadlock)”

Thanks!

Regards,

Nuno

> On 19 Jul 2024, at 11:41, Nuno Santos <nuno.santos at imaginando.pt> wrote:
> 
> Dennis,
> 
> I’m willing to try to run this on Linux and see if I can spot anything there. It might take me a while to setup though.
> 
> I have built Qt with -sanitize thread. 
> 
> When using that kit, the -fsanitize=thread option is automatically applied to the program as well, manually applying:
> 
> QMAKE_CXXFLAGS += -fsanitize=thread
> 
> Makes that option appear two times in the compilation:
> 
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -c -pipe -stdlib=libc++ -fsanitize=thread -O2 -std=gnu++1z  -arch arm64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.2.sdk -mmacosx-version-min=11.0 -fsanitize=thread -fno-omit-frame-pointer -Wall -Wextra …
> 
> Regarding compiler versions:
> 
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ --version
> Apple clang version 15.0.0 (clang-1500.1.0.2.5)
> Target: arm64-apple-darwin23.4.0
> Thread model: posix
> 
> Regards,
> 
> Nuno
> 
>> On 19 Jul 2024, at 11:34, Dennis Luehring <dl.soluz at gmx.net> wrote:
>> 
>> Am 19.07.2024 um 12:30 schrieb Nuno Santos:
>>> That’s the biggest problem. It happens soooo RARELY.
>>> 
>>> We can’t find a sistematic way of reproducing it. That is why I was trying to find a more analytical way of detecting it.
>> 
>> can you're app be build and run on linux - sometimes the problems
>> getting better detectable when switching OS - another time :)
>> 
>> 
>> still not clear if you really build Qt AND your app with TSAN (i don't
>> think so) and if you're using latest compilers available
>> 
>> 
>> 
>> 
>> 
>> 
>> 
> 

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