Re: 2.6.15-rt17

[Steven Rostedt]

On Tue, 21 Feb 2006, Michal Piotrowski wrote:

> Hi,
>
> On 21/02/06, Ingo Molnar <mingo@xxxxxxx> wrote:
> > i have released the 2.6.15-rt17 tree, which can be downloaded from the
> > usual place:
> [snip]
> > to build a 2.6.15-rt17 tree, the following patches should be applied:
> >
> >   http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.15.tar.bz2
> >   http://redhat.com/~mingo/realtime-preempt/patch-2.6.15-rt17
> >
> >         Ingo
>
> I have noticed some bugs
>
> ----------------------------->
> | new stack-footprint maximum: swapper/0, 788 bytes (out of 4044 bytes).
> ------------|
> {   24} [<c0135e7d>] debug_stackoverflow+0x80/0xb2
> {   28} [<c01364e9>] __mcount+0x3b/0xb2
> {   20} [<c010ebd8>] mcount+0x14/0x18
> {  124} [<c01dc5cf>] number+0xe/0x204
> {   76} [<c01dcbc3>] vsnprintf+0x3fe/0x438
> {   28} [<c01dcc18>] vscnprintf+0x1b/0x2b
> {  128} [<c011bd04>] vprintk+0x7a/0x23d
> {   20} [<c011bc88>] printk+0x18/0x1a
> {  172} [<c010ec2a>] MP_processor_info+0x4a/0x1b4
> {   36} [<c010ee2e>] mp_register_lapic+0x9a/0xa0
> {   24} [<c0482d5e>] acpi_parse_lapic+0x45/0x56
> {   28} [<c048dda6>] acpi_table_parse_madt_family+0xb0/0x100
> {   28} [<c048de10>] acpi_table_parse_madt+0x1a/0x1c
> {   32} [<c048312a>] acpi_parse_madt_lapic_entries+0x49/0x9a
> {    8} [<c048327d>] acpi_process_madt+0x23/0xb3
> {   24} [<c0483540>] acpi_boot_init+0x3c/0x4c
> {   20} [<c04805d4>] setup_arch+0x1af/0x1ed
> {   24} [<c047c72f>] start_kernel+0x30/0x19a
>

Ingo,

Maybe the following patch is needed, so that people know that this is not
a bug.

-- Steve

Index: linux-2.6.15-rt17/kernel/latency.c
===================================================================
--- linux-2.6.15-rt17.orig/kernel/latency.c	2006-02-21 11:44:54.000000000 -0500
+++ linux-2.6.15-rt17/kernel/latency.c	2006-02-22 07:20:55.000000000 -0500
@@ -418,6 +418,8 @@ static notrace void __print_worst_stack(
 	printk("| new stack-footprint maximum: %s/%d, %ld bytes (out of %ld bytes).\n",
 		worst_stack_comm, worst_stack_pid,
 		MAX_STACK-worst_stack_left, (long)MAX_STACK);
+	printk("| This is not a BUG\n");
+	printk("| turn off CONFIG_DEBUG_STACK_OVERFLOW if you don't want this\n");
 	printk("------------|\n");

 	show_stackframe();
-
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