[Bug malloc/16573] mtrace hangs when MALLOC_TRACE is defined

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https://sourceware.org/bugzilla/show_bug.cgi?id=16573

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e621246ec6393ea08ae50310f9d5e72500f8c9bc

commit e621246ec6393ea08ae50310f9d5e72500f8c9bc
Author: Carlos O'Donell <carlos@redhat.com>
Date:   Mon Apr 8 17:35:05 2019 -0400

    malloc: Set and reset all hooks for tracing (Bug 16573)

    If an error occurs during the tracing operation, particularly during a
    call to lock_and_info() which calls _dl_addr, we may end up calling back
    into the malloc-subsystem and relock the loader lock and deadlock. For
    all intents and purposes the call to _dl_addr can call any of the malloc
    family API functions and so we should disable all tracing before calling
    such loader functions.  This is similar to the strategy that the new
    malloc tracer takes when calling the real malloc, namely that all
    tracing ceases at the boundary to the real function and any faults at
    that point are the purvue of the library (though the new tracer does
    this on a per-thread basis in an MT-safe fashion). Since the new tracer
    and the hook deprecation are not yet complete we must fix these issues
    where we can.

    Tested on x86_64 with no regressions.

    Co-authored-by: Kwok Cheung Yeung <kcy@codesourcery.com>
    Reviewed-by: DJ Delorie <dj@redhat.com>

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

Summary of changes:
 ChangeLog       |   15 +++++++++++
 malloc/mtrace.c |   72 +++++++++++++++++++++++++++++++++++--------------------
 2 files changed, 61 insertions(+), 26 deletions(-)

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