Re: Problem with perf report --gtk

Ian Rogers
2025-09-09T13:04:56Z

On Tue, Sep 9, 2025 at 3:33 AM Guilherme Amadio <amadio@gentoo.org> wrote:
>
> Hi Arnaldo, Namhyung,
>
> Since sometime we have a bug in Gentoo's bugzilla about perf report --gtk not
> working¹: https://bugs.gentoo.org/937869
>
> I know this feature is not used very much, but I thought I'd report in
> any case. The problem is easily reproducible as shown below:
>
>
> $ perf record -a -g -- sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 1.818 MB perf.data (6648 samples) ]
> $ LD_DEBUG=symbols perf report --gtk 2>&1 | grep '(fatal)'
> 288067: /usr/libexec/perf-core/libperf-gtk.so: error: symbol lookup error: undefined symbol: hashmap_find (fatal)
> $ perf report --gtk
> GTK browser requested but could not find libperf-gtk.so
>
> I tried this with perf 6.16, but this bug seems to have been there since
> at least 6.12.
>
> Please let me know if it's better to file problems at https://bugzilla.kernel.org/.

Thanks for letting us know Guilherme! I suspect I broke things when
trying to fix python things. The code linking libperf-gtk.so is:
https://web.git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/Makefile.perf?h=perf-tools-next#n809
The hashmap symbols are part of the perf-util library:
https://web.git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/util/Build?h=perf-tools-next#n197
So maybe there needs to be a libbpf -lbpf for your case? Alternatively
we may need to reorder the libraries here:
https://web.git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/Makefile.perf?h=perf-tools-next#n464
like:
PERFLIBS += $(LIBPERF_BENCH) $(LIBPERF_TEST) $(LIBPERF_UI) $(LIBPERF_UTIL)
becomes:
PERFLIBS += $(LIBPERF_BENCH) $(LIBPERF_TEST) $(LIBPERF_UTIL) $(LIBPERF_UI)

Thanks,
Ian