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fvdl@NetBSD.org said:
> Ok, that narrows it down to changes that only affect the
> MULTIPROCESSOR case.

Didn't follow the thread from the beginning, but there was a change
by me which unfortunately affects multiprocessor systems: I changed
the kernel memory allocator to respect the execute permission bit.
(This used to work all the time for alpha.)
I don't understand all the details yet, but MP systems need some
pieces of memory mapped with execute permission; see the appended
patch.
sorry for any breakage
Matthias



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Index: sys/arch/amd64/amd64/cpu.c
===================================================================
RCS file: /cvsroot/src/sys/arch/amd64/amd64/cpu.c,v
retrieving revision 1.10
diff -u -p -r1.10 cpu.c
--- sys/arch/amd64/amd64/cpu.c	7 Jun 2006 22:37:14 -0000	1.10
+++ sys/arch/amd64/amd64/cpu.c	12 Jul 2006 19:18:54 -0000
@@ -249,7 +249,8 @@ cpu_attach(parent, self, aux)
 	 * structure, otherwise use the primary's.
 	 */
 	if (caa->cpu_role == CPU_ROLE_AP) {
-		ci = malloc(sizeof(*ci), M_DEVBUF, M_WAITOK);
+		ci = (struct cpu_info *)uvm_km_alloc(kernel_map, sizeof(*ci),
+			0, UVM_KMF_WIRED | UVM_KMF_EXEC);
 		memset(ci, 0, sizeof(*ci));
 #if defined(MULTIPROCESSOR)
 		if (cpu_info[cpunum] != NULL)
@@ -289,7 +290,8 @@ cpu_attach(parent, self, aux)
 	/*
 	 * Allocate UPAGES contiguous pages for the idle PCB and stack.
 	 */
-	kstack = uvm_km_alloc(kernel_map, USPACE, 0, UVM_KMF_WIRED);
+	kstack = uvm_km_alloc(kernel_map, USPACE, 0,
+			      UVM_KMF_WIRED|UVM_KMF_EXEC);
 	if (kstack == 0) {
 		if (caa->cpu_role != CPU_ROLE_AP) {
 			panic("cpu_attach: unable to allocate idle stack for"

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