p11_library_mutex problems on W32

Stef Walter stefw at redhat.com
Tue Apr 2 12:49:45 PDT 2013

Thanks for digging into the issue.

Typically I build mingw builds every so often before major releases,
and fix issues I see. So you may be seeing some win32 related code rot
related to some recent p11-kit refactoring.

On 04/01/2013 08:14 PM, LRN wrote:
> p11-kit.exe crashed on me.

What version? And what platform are you running on? Do the tests (ie:
make check) crash? Can you file a bug?

> Tried to debug it, discovered that it crashes in p11_lock(). 
> Debugged it further.

Hmmm, smells like a mutex is not being initialized on win32. Perhaps
being erroneously used by code that's not in a library.

> Turns out, the value gdb prints for &p11_library_mutex changes 
> depending on which part of the code it's in. It's one value inside
>  tool.c and any code called from the .exe file, and another in code
>  called from DllMain.

The p11-kit library and trust module, each use their own locking and
their own 'big' global mutex, callable through p11_lock() and

These are all called the same thing (ie: p11_library_mutex) but are
different instances as they are in separate DLLs. Not meant to be shared.

> Looked up how p11-kit is linked and (oh, the horror!) discovered 
> that it's linked to libp11-library.a (statically, obviously). The 
> very file that does all these mutex-related things. And libp11-kit 
> is linked to it too. Statically. Which is how they get two versions
> of everything.

Yes, the plan is to link common code statically into the various
modules that use it. But it was a regression (due to recent
refactoring) to link the mutex code into p11-kit.

So attached are three patches which I'd be interested if you could
test. If you would like to file a bug here, that's actually a better
way to iterate on these sorts of fixes:


My guess is that the first patch will fix your problem. The second
patch cleans up the way we build the code, and hopefully makes things
a bit clearer. The third patch fixes another WIN32 build problem.

Looking forward to hearing how it goes (on a newly filed bugzilla bug
if possible).


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