Hi Mike,

Mike Gran <spk121@yahoo.com> skribis:

> This gives
>
>   Program received signal SIGSEGV, Segmentation fault.
>   [Switching to Thread 0xb7d98b40 (LWP 20488)]
>   0xb7f251ab in smob_mark (addr=0x8608ff0, mark_stack_ptr=0xb7d90308, 
>       mark_stack_limit=0xb7d982f0, env=0) at smob.c:325
>   325           SCM_I_CURRENT_THREAD->current_mark_stack_ptr = mark_stack_ptr;
>
> Here's what's happening internally.  When Guile starts up, it creates 3
> threads
> * Initial thread
> * GC thread from scm_storage_prehistory GC_INIT()
> * signal delivery thread
>
> That second thread is the one from which automatic garbage collection
> occurs.  The way that thread gets created, it has an
> scm_i_current_thread == NULL, apparently.

Is there any chance that you’re using a GC 7.3 pre-release?

There was a similar report on IRC, and the fix appears to be: