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From: Russ Cox <rsc@swt...>
Subject: drawterm sigsegv on linux 2.6.18
Date: Tue, 29 May 2007 08:26:02 -0400

> When I do a "du -a /" on a plan9 cpu server via drawterm,  drawterm
> gets a sigsegv after a while.  Gdb  reports that the sigsegv arrived
> when tas.c:9 (inline assembler code to do test and set) is called.  I
> cannot see anything wrong with the tas code though.

The problem isn't in tas but its caller -- note that tas
is being passed a null pointer.  Thanks for the gdb 
stack trace, which was very helpful.

The fix this change to kern/devfs-posix.c (a similar
change applies to kern/devfs-win32.c too):

 		cname = addelem(cname, name[i]);
 		wq->qid[i] = nc->qid;
 	}
-	nc->name = nil;
-	cnameclose(cname);
+	nc->name = cname;
 	if(i != nname){
 		cclose(nc);
 		wq->clone = nil;

The bug is only triggered when traversing paths 
more than 16 levels deep on the local machine.

Russ