[Bug libc/17977] gethostbyname_r hangs forever

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https://sourceware.org/bugzilla/show_bug.cgi?id=17977

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b57525f1a376149840f740a31535681c07152ba4

commit b57525f1a376149840f740a31535681c07152ba4
Author: Dmitry V. Levin <ldv@altlinux.org>
Date:   Thu Jun 18 21:40:46 2015 +0000

    Fix potential hanging of gethostbyaddr_r/gethostbyname_r

    When "reorder" resolver option is enabled, threads of a multi-threaded
process
    could hang in gethostbyaddr_r, gethostbyname_r, or gethostbyname2_r.

    Due to a trivial bug in _res_hconf_reorder_addrs, simultaneous
    invocations of this function in a multi-threaded process could result to
    _res_hconf_reorder_addrs returning without releasing the lock it holds,
    causing other threads to block indefinitely while waiting for the lock
    that is not going to be released.

    [BZ #17977]
    * resolv/res_hconf.c (_res_hconf_reorder_addrs): Fix unlocking
    when initializing interface list, based on the bug analysis
    and the patch proposed by Eric Newton.
    * resolv/tst-res_hconf_reorder.c: New test.
    * resolv/Makefile [$(have-thread-library) = yes] (tests): Add
    tst-res_hconf_reorder.
    ($(objpfx)tst-res_hconf_reorder): Depend on $(libdl)
    and $(shared-thread-library).
    (tst-res_hconf_reorder-ENV): New variable.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=47852c972d1ad80d8b38d9e94507b27df0ede421

commit 47852c972d1ad80d8b38d9e94507b27df0ede421
Author: Dmitry V. Levin <ldv@altlinux.org>
Date:   Mon Jun 22 09:57:14 2015 +0000

    _res_hconf_reorder_addrs: fix typo in comment

    * resolv/res_hconf.c (_res_hconf_reorder_addrs): Fix typo in comment.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                      |   16 ++++++
 NEWS                           |   20 ++++----
 resolv/Makefile                |    4 ++
 resolv/res_hconf.c             |    6 +-
 resolv/tst-res_hconf_reorder.c |  112 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 145 insertions(+), 13 deletions(-)
 create mode 100644 resolv/tst-res_hconf_reorder.c

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