Mark Wielaard wrote:
>
> Hi Mark,
>
> On Thu, Oct 22, 2026 at 11:20:44PM -0700, Mark Harris wrote:
> > I encountered 50 regtest failures running Valgrind 3.28.0.RC1
> > 1ab15ca91e86 on Fedora Linux 44 (COSMIC) aarch64.
>
> That is a bit more than we like, but it seems most can be explained.
>
> > == 795 tests, 48 stderr failures, 1 stdout failure, 0 stderrB
> > failures, 1 stdoutB failure, 0 post failures ==
> >
> > The failures fall into a few categories.
> >
> > 21 tests failed due to extra inherited fds from the desktop
> > environment; these pass if rerun outside of the desktop environment:
> > none/tests/fdleak_cmsg (stderr)
> > none/tests/fdleak_cmsg_supp (stderr)
> > none/tests/fdleak_cmsg_xml (stderr)
> > none/tests/fdleak_creat (stderr)
> > none/tests/fdleak_creat_sup (stderr)
> > none/tests/fdleak_creat_xml (stderr)
> > none/tests/fdleak_dup (stderr)
> > none/tests/fdleak_dup2 (stderr)
> > none/tests/fdleak_dup2_xml (stderr)
> > none/tests/fdleak_dup_xml (stderr)
> > none/tests/fdleak_fcntl (stderr)
> > none/tests/fdleak_fcntl_xml (stderr)
> > none/tests/fdleak_ipv4 (stderr)
> > none/tests/fdleak_open (stderr)
> > none/tests/fdleak_pipe (stderr)
> > none/tests/fdleak_socketpair (stderr)
> > none/tests/linux/getdents_filter (stdout)
> > none/tests/track_high (stderr)
> > none/tests/track_yes (stderr)
> > none/tests/rlimit64_nofile (stderr)
> > none/tests/rlimit_nofile (stderr)
>
> That probably means there is some bug (file descriptor leak) in your
> desktop environment, it probably launches programs with some still
> open file descriptor which then gets inherited.
Agreed.
>
> > 10 failed because "Max number of guard pages is too low":
> > memcheck/tests/err_disable4 (stderr)
> > memcheck/tests/thread_alloca (stderr)
> > helgrind/tests/annotate_smart_pointer (stderr)
> > helgrind/tests/pth_barrier3 (stderr)
> > drd/tests/annotate_smart_pointer (stderr)
> > drd/tests/concurrent_close (stderr)
> > drd/tests/pth_barrier3 (stderr)
> > drd/tests/pth_barrier_thr_cr (stderr)
> > drd/tests/pth_create_chain (stderr)
> > drd/tests/swapcontext (stderr)
>
> I don't understand these. Would you be able to recompile with this
> patch:
>
> diff --git a/coregrind/m_aspacemgr/aspacemgr-linux.c
> b/coregrind/m_aspacemgr/aspacemgr-linux.c
> index 6ede41a0151f..a9ee0e3e670d 100644
> --- a/coregrind/m_aspacemgr/aspacemgr-linux.c
> +++ b/coregrind/m_aspacemgr/aspacemgr-linux.c
> @@ -1107,7 +1107,7 @@ static void guard_page_install ( Addr addr ) {
> Addr addr_aligned = addr & ~(VKI_PAGE_SIZE - 1);
> if (nguardpages_used >= VG_N_GUARDS) {
> VG_(printf)("Use --max-guard-pages=INT to specify a larger number of\n"
> - "guard pages and rerun valgrind\n");
> + "guard pages (current %u) and rerun valgrind\n",
> VG_N_GUARDS);
> VG_(core_panic)("Max number of guard pages is too low");
> }
> // bisect
>
> We might be not be initializing VG_N_GUARDS correctly. Or something
> in your environment installs lots (500+?) guardpages for some reason.
With this patch, tests like memcheck/tests/err_disable4 show:
Use --max-guard-pages=INT to specify a larger number of
guard pages (current 500) and rerun valgrind
I just noticed that 9 of these 10 are also listed as failures in your
Fedora aarch64 run. Are yours failing for a different reason?
>
> > 8 are missing a line in the backtrace:
> > memcheck/tests/fwrite (stderr)
> > memcheck/tests/linux/sys-copy_file_range (stderr)
> > memcheck/tests/linux/sys-preadv_pwritev (stderr)
> > memcheck/tests/sendmsg (stderr)
> > memcheck/tests/writev1 (stderr)
> > none/tests/track_bad (stderr)
> > none/tests/track_new (stderr)
> > none/tests/use_after_close (stderr)
> >
> > 7 have different varinfo descriptions:
> > memcheck/tests/dw4 (stderr)
> > memcheck/tests/varinfo2 (stderr)
> > memcheck/tests/varinfo4 (stderr)
> > memcheck/tests/varinfo5 (stderr)
> > memcheck/tests/varinfo6 (stderr)
> > memcheck/tests/varinforestrict (stderr)
> > helgrind/tests/hg05_race2 (stderr)
>
> These are also seen on other arm64 setups. We seem to not
> correctly/exactly unwind.
Ok
>
> > 4 have other failures:
> > gdbserver_tests/hgtls (stdoutB)
> > helgrind/tests/tc20_verifywrap (stderr)
> > drd/tests/pth_detached3 (stderr)
> > drd/tests/tls_threads (stderr)
>
> These also (sometimes) fail on other arches.
Ok
>
> > Full regtest diffs: https://paste.centos.org/view/95f06742
>
> Thanks,
>
> Mark
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