[Bug malloc/22408] malloc_info access heaps without arena lock, ignores heaps

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https://sourceware.org/bugzilla/show_bug.cgi?id=22408

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7a9368a1174cb15b9f1d6342e0e10dd90dae238d

commit 7a9368a1174cb15b9f1d6342e0e10dd90dae238d
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Nov 15 11:39:01 2017 +0100

    malloc: Add missing arena lock in malloc_info [BZ #22408]

    Obtain the size information while the arena lock is acquired, and only
    print it later.

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

Summary of changes:
 ChangeLog                |    9 ++++
 malloc/Makefile          |    2 +
 malloc/malloc.c          |   16 +++++--
 malloc/tst-malloc_info.c |  101 ++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 124 insertions(+), 4 deletions(-)
 create mode 100644 malloc/tst-malloc_info.c

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