linux-kernel - Re: 2.6.30-git(16 and 17) system hangs after resume from suspend to disk, mce related?

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Date:	Tue, 23 Jun 2009 12:40:54 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Maciej Rutecki <maciej.rutecki@...il.com>
CC:	Andi Kleen <ak@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.30-git(16 and 17) system hangs after resume from suspend
 to 	disk, mce related?

Maciej Rutecki wrote:
> 2009/6/22 Andi Kleen <ak@...ux.intel.com>:
> 
>> Here's a debug patch for the poller: http://firstfloor.org/ak/mcp-debug
>> Can you apply that and try again and send me the output?
>>
> 
> Dmesg after resume:
> http://unixy.pl/maciek/download/kernel/2.6.30-git17/pc/dmesg-2.6.30-git17-patch.txt
> 
> System hangs when uptime is roughly 5-6 minutes (when I don't change
> check_interval). netconsole doesn't show anything.
> 

I found in the dmesg that mce_init() and mce_cpu_features() are called
on cpu0 twice in short time:

[   82.989005] mcp on cpu 0 flags 2 banks ecc39e70
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:502
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:506
[   82.989005] bank 0
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] bank 1
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] bank 2
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] bank 3
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] bank 4
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] bank 5
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] mcp on cpu 0 finished
[   82.989005] CPU0: Thermal LVT vector (0xfa) already installed
[   82.989005] PM: Restoring platform NVS memory
[   82.989005] mcp on cpu 0 flags 2 banks ecc39e70
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:502
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:506
[   82.989005] bank 0
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] bank 1
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] bank 2
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] bank 3
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] bank 4
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] bank 5
[   82.989005] [0] arch/x86/kernel/cpu/mcheck/mce.c:518
[   82.989005] mcp on cpu 0 finished
[   82.989005] CPU0: Thermal LVT vector (0xfa) already installed

mce_cpu_features() (which prints "Thermal ...") is always paired with
mce_init(), and is called only from mcheck_init() and mce_resume().

One of the above would be from mce_resume(), and if another was from
mcheck_init(), then setup_timer() in mce_init_timer() will break the
pending timer...

[arch/x86/power/cpu.c]
> static void __restore_processor_state(struct saved_context *ctxt)
> {
>  :
> #ifdef CONFIG_X86_32
>         mcheck_init(&boot_cpu_data);
> #endif
> }

Hum?

Maciej, could you try this patch? 

Thanks,
H.Seto

===
[PATCH] x86: Fix mce resume on 32bit

Calling mcheck_init() on resume is required only with CONFIG_X86_OLD_MCE=y.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
---
 arch/x86/power/cpu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index d277ef1..b3d20b9 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -244,7 +244,7 @@ static void __restore_processor_state(struct saved_context *ctxt)
 	do_fpu_end();
 	mtrr_ap_init();
 
-#ifdef CONFIG_X86_32
+#ifdef CONFIG_X86_OLD_MCE
 	mcheck_init(&boot_cpu_data);
 #endif
 }
-- 
1.6.3

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