WSL2中已安装dot但KCachegrind无法显示控制流图求助

环境信息 #

• 操作系统：WSL2

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.6 LTS
Release:        20.04
Codename:       focal

• KCachegrind版本：

$ kcachegrind --version
kcachegrind 25.04.1

• Dot版本：

$ dot -V
dot - graphviz version 2.43.0 (0)

已执行排查步骤 #

• 直接测试dot功能：

echo "digraph G { A -> B }" | dot -Tpng -o test.png
# test.png已成功生成

• 检查/tmp权限：

$ ls -ld /tmp
drwxrwxrwt 9 root root 12288 Jun  9 14:39 /tmp

错误现象 #

运行KCachegrind时，控制流图无法显示，仅提示：

No graph available because the layouting process failed. Trying to run the following command did not work dot -Tplain-ext
Please check that dot is installed.

自行执行dot -Tplain-ext test.dot命令可正常输出，但运行KCachegrind时日志显示：

$ kcachegrind callgrind_original.out.55340
Selected  "main"
ControlFlowGraphView::refresh: Starting process  QProcess(0x566cd5d2b660) , ' QProcess(0x566cd5d2b660) '
Running 'objdump -C -d --start-address=0x11E0 --stop-address=0x201A /home/user/prog/test/real'...
ControlFlowGraphView::dotError: Got  QProcess::WriteError  from QProcess  QProcess(0x566cd5d2b660)
QProcess: Destroyed while process ("dot") is still running.
ControlFlowGraphView::dotExited: QProcess  QProcess(0x566cd5d2b660)

尝试以root身份运行KCachegrind时，出现DBus会话总线未找到的错误，即使执行提示的export命令也无法解决。

求助问题 #

导致该问题的原因是什么？如何让KCachegrind正常显示控制流图？

内容的提问来源于stack exchange，提问作者ColrblindMartian