[Pkg-samba-maint] Bug#732342: Stack Trace

[Andrew Bartlett]

On Tue, 2014-01-07 at 16:58 -0800, Steve Langasek wrote:
> On Wed, Jan 08, 2014 at 01:54:32PM +1300, Andrew Bartlett wrote:
> 
> > > > Reading symbols from /usr/lib/x86_64-linux-gnu/libhdb.so.9...Reading
> > > > symbols from
> > > > /usr/lib/debug/usr/lib/x86_64-linux-gnu/libhdb.so.9.2.0...done.
> > > > done.
> > > > Loaded symbols for /usr/lib/x86_64-linux-gnu/libhdb.so.9
> 
> > > > That happened with the samba server in PDC mode, running "passwd"
> > > > via sssd or changing the password via Windows 8.
> 
> > > I'm sorry to say that this stack trace shows signs of stack corruption.
> > > "0x0000000000000000" and "0x0000000000000008" are not valid addresses to
> > > appear in a backtrace.
> 
> > > You may have better luck debugging by running under valgrind, which can
> > > often detect stack corruption errors at runtime /before/ they clobber the
> > > stack.
> 
> > I strongly suspect in this and in 734355 that Heimdal and Samba have got
> > out of sync.  We use libhdb (and other parts) from Heimdal in a quite
> > intimate manner.
> 
> By "intimate", do you mean "using private interfaces"?

I understand the interfaces are public, but I'm pretty sure that Samba
is the only external user of some of these, so we find out about
breakages the hard way.  Also, it seem that the ABI changes are not
tracked at the .so level, so auto dep-solving may not find them. 

Andrew Bartlett

-- 
Andrew Bartlett
http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba



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