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Bug#836848: marked as done (libasan3: AddressSanitizer breaks when LD_PRELOAD is defined)

Your message dated Thu, 07 Feb 2019 03:13:19 +0000
with message-id <E1gra7r-000G9u-7I@fasolo.debian.org>
and subject line Bug#920171: Removed package(s) from unstable
has caused the Debian Bug report #836848,
regarding libasan3: AddressSanitizer breaks when LD_PRELOAD is defined
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
836848: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=836848
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: libasan3
Version: 6.2.0-3
Severity: normal

When LD_PRELOAD is defined (which can be a consequence of gtk3-nocsd
being installed and the user being in an X11 session), I get:

cventin:~> gcc -fsanitize=address t.c
cventin:~> ./a.out
==22051==ASan runtime does not come first in initial library list; you should either link runtime to your application or manually preload it with LD_PRELOAD.

Something should be done. This was very confusing at first, because
the problem first came here when I ran a configure script which was
working a few days ago (after investigation, it is now clear that
the reason was that it wasn't under a X11 session a few days ago),
and just saw:

checking whether we are cross compiling... configure: error: in `/home/vlefevre/tmp/mpfr-old':
configure: error: cannot run C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details

I could see the error message, but the reason wasn't clear yet
(I initially thought of a regression after a recent upgrade).

So, I think that if possible, having LD_PRELOAD already set shouldn't
affect ASan. Shouldn't -static-libasan be the default, for instance?

If this is not possible, various things should be clarified:

1. The error message should be more informative, e.g. when LD_PRELOAD
is set, say that LD_PRELOAD is set but ASan runtime does not appear
in LD_PRELOAD or does not come first.

2. The gcc(1) man page does not mention LD_PRELOAD at all. Ditto for
the GCC manual.

3. How to find the right ASan runtime *automatically* should also be
documented.

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-1-amd64 (SMP w/12 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libasan3 depends on:
ii  gcc-6-base  6.2.0-3
ii  libc6       2.24-2
ii  libgcc1     1:6.2.0-3
ii  libstdc++6  6.2.0-3

libasan3 recommends no packages.

libasan3 suggests no packages.

-- no debconf information

--- End Message ---
--- Begin Message --- 
Version: 6.5.0-2+rm

Dear submitter,

as the package gcc-6 has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/920171

The version of this package that was in Debian prior to this removal
can still be found using http://snapshot.debian.org/.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Scott Kitterman (the ftpmaster behind the curtain)

--- End Message ---
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