[Interest] Will TSAN_OPTIONS=detect_deadlocks=1 work when Qt is compiled with -sanitize thread?
Nuno Santos
nuno.santos at imaginando.pt
Fri Jul 19 12:52:06 CEST 2024
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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