[Bug 529714] Re: rhythmbox crashed with SIGSEGV in _nss_wins_gethostbyname_r()

[Chow Loong Jin]

Okay, I think I've found the issue, based on a crash with liferea:-

At wins.c:95, we have
DEBUGLEVEL = 0;

Somewhere in source3/include/debug.h, we have
#define DEBUGLEVEL *debug_level
extern int DEBUGLEVEL;

In source3/lib/debug.c, we have:
int DEBUGLEVEL = &debug_all_class_hack;


Based on this, all seems well and good, except that due to a problematic build system, libnss_wins.so dynamically resolves this debug_level variable when loaded by libc. In the case of liferea, it uses a global int debug_level somewhere around its source code. I reckon the other applications that are affected by this bug also use something similar.

Given that Natty is really near, and I reckon it's too late to be trying
something grand like controlling what symbols do and do not get
exported/dynamically resolved during load, I have come up with a patch
that renames debug_level to smb_debug_level in source3/include/debug.h.
This should solve the issue for the time being.

I'm now test-building the patched package, and will post a follow-up
comment.

** Patch added: "debdiff-debuglevel.patch"
   https://bugs.launchpad.net/ubuntu/+source/samba/+bug/529714/+attachment/2089845/+files/debdiff-debuglevel.patch

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https://bugs.launchpad.net/bugs/529714

Title:
  rhythmbox crashed with SIGSEGV in _nss_wins_gethostbyname_r()