Konstantin Belousov d48b6d9ad6 Never zero-out db_last_symtab. Whan backtraces are done
in parallel in several threads, one symbol lookup could
clear db_last_symtab when another one going to use it as
starting point for traversal.

Approved by:	pjd (mentor)
MFC after:	1 month
2006-06-16 16:17:52 +00:00
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