nova: avoid fault during thread migration

triggert by cpu_balancer.run on Qemu

Fixes #4742

repos/base-nova/ports/nova.hash

@@ -1 +1 @@
-55bf35a51a039d4fe420fcc310c4271b615913eb
+c7c2e9cf8d1bcd15608da93d5aa152d32aef1a33

repos/base-nova/ports/nova.port

@@ -4,7 +4,7 @@ DOWNLOADS := nova.git
 
 # r10 branch
 URL(nova) := https://github.com/alex-ab/NOVA.git
-REV(nova) := 953b8d36d909f87d8465e43ab35c22b636d04c87
+REV(nova) := 0cb9c8abfe9cb9d0992c8dbe048f55610fb54539
 DIR(nova) := src/kernel/nova
 
 PATCHES   := $(sort $(wildcard $(REP_DIR)/patches/*.patch))

repos/os/run/cpu_balancer.run

@@ -127,6 +127,7 @@ append config {
 		<binary name="shim"/>
 		<affinity xpos="1" ypos="0" width="2" height="1"/>
 		<resource name="RAM" quantum="3M"/>
+		<config percent="95"/>
 		<route>
 
 			<!-- by shim binary -->
@@ -163,4 +164,4 @@ build_boot_image { core ld.lib.so init timer cpu_balancer cpu_burner top dynamic
 append qemu_args " -nographic"
 append qemu_args " -smp [expr $cpu_width * $cpu_height],cores=$cpu_width,threads=$cpu_height"
 
-run_genode_until {.*thread xpos="1" ypos="0" name="signal handler" policy="max-utilize".*\n} 60
+run_genode_until {.*thread xpos="[1-9]" ypos="0" name="signal handler" policy="max-utilize".*\n} 60