https://bugs.kde.org/show_bug.cgi?id=471340

            Bug ID: 471340
           Summary: callgrind Error: can not open cache simulation output
                    file callgrind.out.pid
    Classification: Developer tools
           Product: valgrind
           Version: 3.21.0
          Platform: Ubuntu
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: callgrind
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

SUMMARY

When I use this cmd: `valgrind --tool=callgrind --trace-children=yes unbound -d
-c /etc/unbound/unbound.conf` to debug unbound, it shows: 

==19295== Error: can not open cache simulation output file
`callgrind.out.19295'
==19295== could not unlink /tmp/vgdb-pipe-from-vgdb-to-19295-by-unbound-on-???
==19295== could not unlink /tmp/vgdb-pipe-to-vgdb-from-19295-by-unbound-on-???
==19295== could not unlink
/tmp/vgdb-pipe-shared-mem-vgdb-19295-by-unbound-on-???

Do you have similar issues?

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