[PATCH] Use libnss_files.so for tests posix/bug-ga2 and resolv/tst-leaks2 [BZ #26821]

[Stefan Liebler]

On 11/20/20 2:40 PM, H.J. Lu wrote:
> On Fri, Nov 20, 2020 at 4:08 AM Stefan Liebler via Libc-alpha
> <libc-alpha@sourceware.org> wrote:
>>
>> The tests posix/bug-ga2-mem and resolv/mtrace-tst-leaks2 are failing on
>> fedora 33 as mtrace reports memory leaks.
>>
>> The /etc/nsswitch.conf differs between
>> Fedora 32: hosts:      files dns myhostname
>> Fedora 33: hosts:      files resolve [!UNAVAIL=return] myhostname dns
>>
>> Therefore /lib64/libnss_resolve.so.2 (from systemd) and the dependencies
>> libgcc_s.so.1 and libpthread.so.0 are loaded.
>>
>> Usually all malloc'ed resources from getaddrinfo / gethostbyname are freed
>> and the libraries are dlclose'd in nss/nsswitch.c:libc_freeres_fn (free_mem).
>> Unfortunately, /lib64/libnss_resolve.so.2 is marked with DF_1_NODELETE.
>> As this library is not unmapped, you'll see "Memory not freed".
>>
>> Therefore those tests are now only relying on libnss_files.so by making
>> them test-container tests and providing the required configuration files.
>>
>> By moving the tests to tests-container, those are now running with
>> "make check".  Therefore the mtrace part of the tests are also moved
>> from "make xcheck" to "make check".
>>
>> bug-ga2.c is now using test-driver.c in order to support WAIT_FOR_DEBUGGER
>> environment variable.
>> ---
>>  posix/Makefile                           |  6 +++---
>>  posix/bug-ga2.c                          | 13 +++++++------
>>  posix/bug-ga2.root/etc/hosts             |  1 +
>>  posix/bug-ga2.root/etc/nsswitch.conf     |  2 ++
>>  posix/bug-ga2.root/etc/services          |  1 +
>>  resolv/Makefile                          |  7 +++----
>>  resolv/tst-leaks2.c                      |  6 ++++--
>>  resolv/tst-leaks2.root/etc/hosts         |  1 +
>>  resolv/tst-leaks2.root/etc/nsswitch.conf |  1 +
>>  9 files changed, 23 insertions(+), 15 deletions(-)
>>  create mode 100644 posix/bug-ga2.root/etc/hosts
>>  create mode 100644 posix/bug-ga2.root/etc/nsswitch.conf
>>  create mode 100644 posix/bug-ga2.root/etc/services
>>  create mode 100644 resolv/tst-leaks2.root/etc/hosts
>>  create mode 100644 resolv/tst-leaks2.root/etc/nsswitch.conf
>>
> 
> LGTM.
> 
> Thanks.
> 

I've just committed it and I've also closed the bugzilla.

Thanks,
Stefan