Comment 22 for bug 1561621

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=fc5ad7024c620cdfe9b76e94638aac83b99c5bf8

commit fc5ad7024c620cdfe9b76e94638aac83b99c5bf8
Author: Andreas Schwab <email address hidden>
Date: Tue Aug 8 16:21:58 2017 +0200

    Don't use IFUNC resolver for longjmp or system in libpthread (bug 21041)

    Unlike the vfork forwarder and like the fork forwarder as in bug 19861,
    there won't be a problem when the compiler does not turn this into a tail
    call.

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Summary of changes:
 ChangeLog | 6 ++++++
 nptl/pt-longjmp.c | 31 ++++++++++---------------------
 nptl/pt-system.c | 24 ++++++++----------------
 3 files changed, 24 insertions(+), 37 deletions(-)