[openib-general] Re: [PATH] problem dlopen libibverbs.so

[Michael S. Tsirkin]

Quoting r. Gleb Natapov <glebn at voltaire.com>:
> Subject: Re: [PATH] problem dlopen libibverbs.so
> 
> On Wed, Jul 20, 2005 at 05:57:28PM +0300, Michael S. Tsirkin wrote:
> > Quoting r. Gleb Natapov <glebn at voltaire.com>:
> > > Subject: Re: [PATH] problem dlopen libibverbs.so
> > > 
> > > On Wed, Jul 20, 2005 at 05:24:22PM +0300, Michael S. Tsirkin wrote:
> > > > Quoting r. Gleb Natapov <glebn at voltaire.com>:
> > > > > It appears that libmthca relies on back linking to find symbols from
> > > > > libibverbs but back linking doesn't work in the later case.
> > > > > 
> > > > > I linked libmthca with libibverbs and this solved the problem.
> > > > 
> > > > I wander, however, what happends if you load libibverbs from path
> > > > a, and mthca is linked with libibverbs from path b?
> > > > Any idea?
> > >
> > > If two libibverbs are different it can fail or even crash I think.
> > > This is the same as if libibverb tries to load libmthca compiled from
> > > different svn revision.
> > 
> > May be a problem then: it might be quite hard to debug such crashes.
>
> Like any other problem caused by mismatched libraries.

Right, but I think we dont want another dependency if it can work
without it.

> > What about passing RTLD_GLOBAL to dlopen, instead?
>
> The strange thing is it doesn't work, but it should according to man
> page.

Better debug it then.


-- 
MST