Hi Mark,
On Fri, 2026-10-23 at 07:20 -0700, Mark Harris wrote:
> Mark Wielaard wrote:
>
> > > 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?
O darn. I hadn't looked clearly at those results apparently.
Yes, they fail in the same way. Looks like this is an arm64 specific
issue. I have it reproduced now. Trying to figure out why this is
happening.
Thanks,
Mark
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