backtrace symbols are bolixed...

backtrace symbols are bolixed...

[David Miller]

Sometime in the last day or so backtrace symbol printouts
have become useless:

[    0.000000] WARNING: at mm/bootmem.c:535 __stop_notes+0xbb10/0x1d660()
[    0.000000] Modules linked in:
[    0.000000] Call Trace:
[    0.000000]  [00000000008611b4] __stop_notes+0xbb10/0x1d660
[    0.000000]  [000000000086195c] __stop_notes+0xc2b8/0x1d660
[    0.000000]  [0000000000861a28] __stop_notes+0xc384/0x1d660
[    0.000000]  [0000000000858678] __stop_notes+0x2fd4/0x1d660
[    0.000000]  [000000000085684c] __stop_notes+0x11a8/0x1d660
[    0.000000]  [00000000006e8bdc] _etext+0xfffffffffffe59f4/0xe18
[    0.000000]  [0000000000000000] (null)

I'll try to bisect but maybe someone can figure it out quickly
meanwhile.

Re: backtrace symbols are bolixed...

[Stephen Rothwell]

Hi Dave,

On Fri, 19 Jun 2009 00:21:01 -0700 (PDT) David Miller <davem@davemloft.net> wrote:
>
> Sometime in the last day or so backtrace symbol printouts
> have become useless:
> 
> [    0.000000] WARNING: at mm/bootmem.c:535 __stop_notes+0xbb10/0x1d660()
> [    0.000000] Modules linked in:
> [    0.000000] Call Trace:
> [    0.000000]  [00000000008611b4] __stop_notes+0xbb10/0x1d660
> [    0.000000]  [000000000086195c] __stop_notes+0xc2b8/0x1d660
> [    0.000000]  [0000000000861a28] __stop_notes+0xc384/0x1d660
> [    0.000000]  [0000000000858678] __stop_notes+0x2fd4/0x1d660
> [    0.000000]  [000000000085684c] __stop_notes+0x11a8/0x1d660
> [    0.000000]  [00000000006e8bdc] _etext+0xfffffffffffe59f4/0xe18
> [    0.000000]  [0000000000000000] (null)
> 
> I'll try to bisect but maybe someone can figure it out quickly
> meanwhile.

Try the following patch:

From: Mike Frysinger <vapier@gentoo.org>
Date: Mon, 15 Jun 2009 07:52:48 -0400
Subject: [PATCH] kallsyms: fix inverted valid symbol checking

The previous commit (17b1f0de) introduced a slightly broken consolidation
of the memory text range checking.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
 scripts/kallsyms.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 3cb5789..64343cc 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -167,11 +167,11 @@ static int symbol_valid_tr(struct sym_entry *s)
 	for (i = 0; i < ARRAY_SIZE(text_ranges); ++i) {
 		tr = &text_ranges[i];
 
-		if (s->addr >= tr->start && s->addr < tr->end)
-			return 0;
+		if (s->addr >= tr->start && s->addr <= tr->end)
+			return 1;
 	}
 
-	return 1;
+	return 0;
 }
 
 static int symbol_valid(struct sym_entry *s)
-- 
1.6.3.1


-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au
http://www.canb.auug.org.au/~sfr/

Re: backtrace symbols are bolixed...

[Ingo Molnar]

* David Miller <davem@davemloft.net> wrote:

> Sometime in the last day or so backtrace symbol printouts
> have become useless:
> 
> [    0.000000] WARNING: at mm/bootmem.c:535 __stop_notes+0xbb10/0x1d660()
> [    0.000000] Modules linked in:
> [    0.000000] Call Trace:
> [    0.000000]  [00000000008611b4] __stop_notes+0xbb10/0x1d660
> [    0.000000]  [000000000086195c] __stop_notes+0xc2b8/0x1d660
> [    0.000000]  [0000000000861a28] __stop_notes+0xc384/0x1d660
> [    0.000000]  [0000000000858678] __stop_notes+0x2fd4/0x1d660
> [    0.000000]  [000000000085684c] __stop_notes+0x11a8/0x1d660
> [    0.000000]  [00000000006e8bdc] _etext+0xfffffffffffe59f4/0xe18
> [    0.000000]  [0000000000000000] (null)
> 
> I'll try to bisect but maybe someone can figure it out quickly
> meanwhile.

I saw this too. One change that went upstream when i started seeing 
these weird backtraces is:

 ad6ccfa: kernel/kallsyms.c: replace deprecated __initcall with device_initcall and fix

Sam and Andrew Cc:-ed.

	Ingo

Re: backtrace symbols are bolixed...

[David Miller]

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Fri, 19 Jun 2009 17:30:52 +1000

> Try the following patch:
> 
> From: Mike Frysinger <vapier@gentoo.org>
> Date: Mon, 15 Jun 2009 07:52:48 -0400
> Subject: [PATCH] kallsyms: fix inverted valid symbol checking
> 
> The previous commit (17b1f0de) introduced a slightly broken consolidation
> of the memory text range checking.
> 
> Signed-off-by: Mike Frysinger <vapier@gentoo.org>

That fixed it, thanks!

Re: backtrace symbols are bolixed...

[David Miller]

From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 19 Jun 2009 09:30:53 +0200

> * David Miller <davem@davemloft.net> wrote:
> 
>> Sometime in the last day or so backtrace symbol printouts
>> have become useless:
>> 
>> [    0.000000] WARNING: at mm/bootmem.c:535 __stop_notes+0xbb10/0x1d660()
>> [    0.000000] Modules linked in:
>> [    0.000000] Call Trace:
>> [    0.000000]  [00000000008611b4] __stop_notes+0xbb10/0x1d660
>> [    0.000000]  [000000000086195c] __stop_notes+0xc2b8/0x1d660
>> [    0.000000]  [0000000000861a28] __stop_notes+0xc384/0x1d660
>> [    0.000000]  [0000000000858678] __stop_notes+0x2fd4/0x1d660
>> [    0.000000]  [000000000085684c] __stop_notes+0x11a8/0x1d660
>> [    0.000000]  [00000000006e8bdc] _etext+0xfffffffffffe59f4/0xe18
>> [    0.000000]  [0000000000000000] (null)
>> 
>> I'll try to bisect but maybe someone can figure it out quickly
>> meanwhile.
> 
> I saw this too. One change that went upstream when i started seeing 
> these weird backtraces is:

The patch from Mike Frysinger posted by Stephen Rothwell fixes
it for me.