Yet another DOD bug

[Dan Sugalski]

Looks like we've a bug in the DOD tracing. As far as I can tell (and 
it's somewhat tough, as my program's rather large) there's a bug 
where metadata on loadlib-loaded libraries doesn't get properly 
marked as live.

The symptoms are straightforward -- the getprop call inside dynext.c 
during library loading fails with a "get_pmc_keyed() not implemented 
in class NCI" message. Littering the source with debugging messages, 
the property PMC on the entries in the library hash changes type. 
Throwing a sweepoff/sweepon pair around the library loading code 
makes the problem go away, so it seems like the PMC is getting 
collected and reused.

I don't have a test case at the moment, though I'll try and work one 
up. (I'm running on 2 hours sleep and far too much caffeine, so I'm 
not at my best. Sorry)

I don't know if this affects all property hashes, or only those on 
loaded libraries.
--
                                        Dan

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Dan Sugalski                          even samurai
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