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KDAB
After upgrading project to C++20, hotspot shows incorrect flamegraph/stacktrace
Describe the bug
Recently we updated Kate text editor to use C++20. After the switch, I noticed that the flamegraph being shown in hotspot was incorrect consistently. (I am not sure if this will be reproducible in any other C++20 app)
To Reproduce Steps to reproduce the behavior:
- Build kate using
kdesrc-build(needs Qt6):kdesrc-build --include-dependencies kate - Source the prefix:
source /path/to/kate/build/prefix.sh - start kate via perf:
perf record --call-graph dwarf kate -b -n . - exit kate
- open hotspot and see weird stacktraces
CMake flags used:
cmake-options -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_CXX_FLAGS="-fno-omit-frame-pointer" -DECM_ENABLE_SANITIZERS="address;leak" -DCMAKE_BUILD_TYPE=RelWithDebInfo
Expected behavior The stacktrace is correct
Screenshots
output of perf report:
.perfparser file for the above screenshot: perf.data.perfparser.tar.gz
Version Info (please complete the following information):
- Linux Kernel version:
6.6.26-1 - perf version:
6.7-1 - hotspot version:
self-compiled, master branch - if self-compiled hotspot, what version of elfutils:
0.191-1 - Qt version:
5.15.12
Just to recheck: is it better if you have the full QT debug info (looks like some symbols were missing)?
Can you share the orignal perf.data file? I tried reproducing the issue but I couldn't see those weird traces.
Could you try again with the appimage release? We had some problems with an old elfutils version.
@Waqar144 do you still run into this? if so please reopen (and ideally provide a way to reproduce - we cannot so far)
Yes, I am still running into this issue. Tried the latest appImage (1.5.1) as well as the latest master. Attaching the perf.data file: perf.zip
the perf.data file is not relocatable, to analyze it we'd basically need your selfcompiled .so files too