> There seems to be no corruption though.  Looking at the code, I can't
quoted text
> see how the requests could leak...

Didn't look close enough.

Index: linux/arch/um/drivers/ubd_kern.c
===================================================================
--- linux.orig/arch/um/drivers/ubd_kern.c	2007-11-27 19:23:37.000000000 +0100
+++ linux/arch/um/drivers/ubd_kern.c	2007-11-27 19:24:24.000000000 +0100
@@ -1132,6 +1132,7 @@ static void do_ubd_request(struct reques
 					       "errno = %d\n", -n);
 				else if(list_empty(&dev->restart))
 					list_add(&dev->restart, &restart);
+				kfree(io_req);
 				return;
 			}
 
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