Re: 2.6.32.2 SATA link detect failed, 2.6.32.1 works fine

From: fengxiangjun <fengxiangjun@neusoft.com>
To: Bjarke Istrup Pedersen <gurligebis@gmail.com>
Cc: Tejun Heo <tj@kernel.org>, Robert Hancock <hancockrwd@gmail.com>,
	linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org
Subject: Re: 2.6.32.2 SATA link detect failed, 2.6.32.1 works fine
Date: Thu, 24 Dec 2009 09:21:29 +0800 (CST)	[thread overview]
Message-ID: <alpine.LNX.2.00.0912240858050.1682@darkstar.example.net> (raw)
In-Reply-To: <9c30dffe0912230402s5af415c3i83d6f5ba4f8f1841@mail.gmail.com>


Hi, it's timing related.

I just tried booting with an initrd, and i want to capture the full error 
message, but with initrd, the problem went away.

The only difference between the two config is:

--- .config.old	2009-12-24 09:16:31.000000000 +0800
+++ .config	2009-12-23 19:05:17.000000000 +0800
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
 # Linux kernel version: 2.6.32.2
-# Mon Dec 21 18:42:50 2009
+# Wed Dec 23 19:05:17 2009
 #
 CONFIG_64BIT=y
 # CONFIG_X86_32 is not set
@@ -100,7 +100,11 @@
 # CONFIG_USER_NS is not set
 # CONFIG_PID_NS is not set
 # CONFIG_NET_NS is not set
-# CONFIG_BLK_DEV_INITRD is not set
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_INITRAMFS_SOURCE=""
+CONFIG_RD_GZIP=y
+CONFIG_RD_BZIP2=y
+CONFIG_RD_LZMA=y
 CONFIG_CC_OPTIMIZE_FOR_SIZE=y
 CONFIG_SYSCTL=y
 CONFIG_ANON_INODES=y
@@ -1710,8 +1714,11 @@
 CONFIG_CRC32=y
 # CONFIG_CRC7 is not set
 # CONFIG_LIBCRC32C is not set
-CONFIG_ZLIB_INFLATE=m
+CONFIG_ZLIB_INFLATE=y
 CONFIG_ZLIB_DEFLATE=m
+CONFIG_DECOMPRESS_GZIP=y
+CONFIG_DECOMPRESS_BZIP2=y
+CONFIG_DECOMPRESS_LZMA=y
 CONFIG_HAS_IOMEM=y
 CONFIG_HAS_IOPORT=y
 CONFIG_HAS_DMA=y

Right now, I can reproduce this problem only when I
running 2.6.32.2 with a specific kernel config.

If I attach a serial console or use initrd to capture
the fail boot log, the problem disapeared. Even running
2.6.31.1 with the exactly same config, no problem. 

So I will say that it's very hard to reproduce this, it's very
subtly timing related. 

I remember when running 2.6.32-rc8 and 2.6.32, the same
problem happened twice, I just can't reproduce it.
And with 2.6.31.x, never running into this.

Oh well. 

On Wed, 23 Dec 2009, Bjarke Istrup Pedersen wrote:

> Hey,
> 
> Could it be an idea to do a bisect for the patch that makes it break? :)
> 
> /Bjarke
> 
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