linux-kernel - Error in save_stack_trace() on x86

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Date:	Sun, 11 May 2008 15:09:28 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>,
	"Arjan van de Ven" <arjan@...ux.intel.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Error in save_stack_trace() on x86_64?

Hi,

I am having a problem with v2.6.26-rc1 on x86_64. It seems that
save_stack_trace() is not able to follow page fault boundaries, since
all my saved traces look like this:

RIP: 0010:[<ffffffff8039b004>]  [<ffffffff8039b004>] add_uevent_var+0xb4/0x160
    ...
 [<ffffffff80221f97>] kmemcheck_read+0x127/0x1e0
 [<ffffffff80222269>] kmemcheck_access+0x179/0x1d0
 [<ffffffff8022231f>] kmemcheck_fault+0x5f/0x80
 [<ffffffff8061cd1e>] do_page_fault+0x4de/0x8d0
 [<ffffffff8061a7d9>] error_exit+0x0/0x51
 [<ffffffffffffffff>] 0xffffffffffffffff

I have this in my .config:

CONFIG_STACKTRACE_SUPPORT=y
CONFIG_STACKTRACE=y
...
CONFIG_FRAME_POINTER=y
...
CONFIG_DEBUG_INFO=y


On 32-bit, I am able to see the calls leading up to the page fault as
well. Did I miss something here?


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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