diff -u qemu-kvm-0.12.3+noroms/debian/changelog qemu-kvm-0.12.3+noroms/debian/changelog
--- qemu-kvm-0.12.3+noroms/debian/changelog
+++ qemu-kvm-0.12.3+noroms/debian/changelog
@@ -1,3 +1,9 @@
+qemu-kvm (0.12.3+noroms-0ubuntu9.1) lucid-proposed; urgency=low
+
+  * Apply a patch to fix a slow (but huge) memory leak (LP: #588293)
+
+ -- Serge Hallyn <serge.hallyn@canonical.com>  Tue, 15 Jun 2010 07:52:46 -0500
+
 qemu-kvm (0.12.3+noroms-0ubuntu9) lucid; urgency=low
 
   * Architecture-specific fixes (LP: #568904)
diff -u qemu-kvm-0.12.3+noroms/debian/patches/series qemu-kvm-0.12.3+noroms/debian/patches/series
--- qemu-kvm-0.12.3+noroms/debian/patches/series
+++ qemu-kvm-0.12.3+noroms/debian/patches/series
@@ -11,0 +12 @@
+block-Fix-multiwrite-memory-leak-in-error-case.patch
only in patch2:
unchanged:
--- qemu-kvm-0.12.3+noroms.orig/debian/patches/block-Fix-multiwrite-memory-leak-in-error-case.patch
+++ qemu-kvm-0.12.3+noroms/debian/patches/block-Fix-multiwrite-memory-leak-in-error-case.patch
@@ -0,0 +1,30 @@
+commit 7eb58a6c556c3880e6712cbf6d24d681261c5095
+Author: Kevin Wolf <kwolf@redhat.com>
+Date:   Tue Apr 6 18:24:07 2010 +0200
+
+    block: Fix multiwrite memory leak in error case
+    
+    Previously multiwrite_user_cb was never called if a request in the multiwrite
+    batch failed right away because it did set mcb->error immediately. Make it look
+    more like a normal callback to fix this.
+
+    (re-based from upstream fix)
+    
+    Reported-by: Juan Quintela <quintela@redhat.com>
+    Signed-off-by: Kevin Wolf <kwolf@redhat.com>
+    Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
+
+Index: qemu-kvm-0.12.3+noroms/block.c
+===================================================================
+--- qemu-kvm-0.12.3+noroms.orig/block.c	2010-06-15 08:27:50.000000000 -0500
++++ qemu-kvm-0.12.3+noroms/block.c	2010-06-15 08:29:10.244281888 -0500
+@@ -1761,7 +1761,8 @@
+                 reqs[i].error = EIO;
+                 goto fail;
+             } else {
+-                mcb->error = EIO;
++                mcb->num_requests++;
++                multiwrite_cb(mcb, -EIO);
+                 break;
+             }
+         } else {