An exception may happen when IPEND[4] is set, i.e, interrupt is globally
disabled. The exception handler cannot lower its priority to IRQ5.
Index: mach-common/entry.S
===================================================================
--- mach-common/entry.S (revision 6699)
+++ mach-common/entry.S (working copy)
@@ -356,6 +356,10 @@ ENTRY(_ex_trap_c)
p4.h = hi(SAFE_USER_INSTRUCTION);
retx = p4;
+ /* enable irq globally */
+ [--sp] = reti;
+ r6 = [sp++];
+
r6 = 0x3f;
sti r6;
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