tests failing on x86_64-linux

[Martin Sebor via Libc-alpha <libc-alpha@sourceware.org>]

I've been seeing quite a few test failures in recent builds, more
than I used to in the past.  Are those expected?  I configure with
no options other than --prefix=/usr and after building without
installing (i.e., just make -j16) run make -j16 check.

The results below are for the top of GCC/Glibc trunk on x86_64
Fedora Linux but I don't think using GCC 10 improves things much
if at all.

The Buildbot (http://glibc-buildbot.reserved-bit.com/waterfall)
doesn't show any useful build results except for aarch64-linux
but of those, the most recent one looks a lot cleaner than what
I see below.

http://glibc-buildbot.reserved-bit.com/builders/glibc-aarch64-linux/builds/2774/steps/check/logs/stdio

Thanks
Martin

UNSUPPORTED: assert/tst-assert-c++
UNSUPPORTED: assert/tst-assert-g++
UNSUPPORTED: debug/tst-chk4
UNSUPPORTED: debug/tst-chk5
UNSUPPORTED: debug/tst-chk6
UNSUPPORTED: debug/tst-lfschk4
UNSUPPORTED: debug/tst-lfschk5
UNSUPPORTED: debug/tst-lfschk6
UNSUPPORTED: dlfcn/bug-atexit3
UNSUPPORTED: elf/tst-audit10
UNSUPPORTED: elf/tst-avx512
FAIL: elf/tst-dlopen-self-container
FAIL: elf/tst-dlopen-tlsmodid-container
UNSUPPORTED: elf/tst-env-setuid
UNSUPPORTED: elf/tst-env-setuid-tunables
FAIL: elf/tst-glibc-hwcaps-cache
FAIL: elf/tst-glibc-hwcaps-prepend-cache
FAIL: elf/tst-ldconfig-bad-aux-cache
FAIL: elf/tst-ldconfig-ld_so_conf-update
FAIL: elf/tst-pldd
XPASS: elf/tst-protected1a
XPASS: elf/tst-protected1b
FAIL: locale/tst-localedef-path-norm
FAIL: localedata/tst-localedef-hardlinks
UNSUPPORTED: math/test-double-libmvec-sincos-avx512
UNSUPPORTED: math/test-float-libmvec-sincosf-avx512
UNSUPPORTED: misc/tst-pkey
UNSUPPORTED: nptl/tst-cancel24
UNSUPPORTED: nptl/tst-cancel24-static
UNSUPPORTED: nptl/tst-minstack-throw
UNSUPPORTED: nptl/tst-once5
FAIL: nptl/tst-pthread-getattr
UNSUPPORTED: nptl/tst-thread-exit-clobber
UNSUPPORTED: nptl/tst-thread_local1
FAIL: nss/tst-nss-db-endgrent
FAIL: nss/tst-nss-db-endpwent
FAIL: nss/tst-nss-files-hosts-long
FAIL: nss/tst-nss-test3
FAIL: nss/tst-reload1
FAIL: posix/bug-ga2
UNSUPPORTED: posix/bug-ga2-mem
UNSUPPORTED: resolv/mtrace-tst-leaks2
FAIL: resolv/tst-leaks2
UNSUPPORTED: stdlib/tst-quick_exit
FAIL: stdlib/tst-system
UNSUPPORTED: stdlib/tst-thread-quick_exit
FAIL: string/tst-strerror
FAIL: string/tst-strsignal
Summary of test results:
      20 FAIL
    4192 PASS
      26 UNSUPPORTED
      16 XFAIL
       2 XPASS
make[1]: *** [Makefile:642: tests] Error 1