Folks, I found the problem, it was a dumb error on my part. I was singly-removing a doubly-linked list entry. Bad Joel. Fix is in SVN revision 1176. Bugzilla 636 (http://oss.oracle.com/bugzilla/show_bug.cgi?id=636), tracking this problem, has been marked FIXED.
Joel -- Life's Little Instruction Book #237 "Seek out the good in people." Joel Becker Principal Software Developer Oracle E-mail: [EMAIL PROTECTED] Phone: (650) 506-8127 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]