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Date: Tue, 26 Apr 2005 14:24:48 +0530
From: Vivek Goyal <vgoyal@in.ibm.com>
To: "Randy.Dunlap" <rddunlap@osdl.org>
Cc: Nagesh Sharyathi <sharyathi@in.ibm.com>, vgoyal@in.ibm.com, akpm@osdl.org,
       ebiederm@xmission.com, fastboot@lists.osdl.org,
       linux-kernel@vger.kernel.org, maneesh@in.ibm.com
Subject: Re: [Fastboot] Re: Kdump Testing
Message-ID: <20050426085448.GB4234@in.ibm.com>
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> 
> 2.6.12-rc2-mm3 reboots vmlinux-recover-UP on panic.
> (vmlinux-recover-SMP hangs during [early] reboot, but -UP
> goes further....)
> 
> (BTW, how does I do serial console from the second
> kernel...?  It has the drivers, but not the command
> line info?  TBD.)
> 


While pre-loading the capture kernel using kexec, you can specify the command
line options to second kernel using --append="". You must already be passing
the root device. Add you serial console parameters as well something like
--append="console=ttyS0, 38400"


> vmlinux-recover-UP gets to this point, hand-written,
> several lines missing:
> 
> kfree_debugcheck: bad ptr c3dbffb0h.  ( == %esi)
> kernel BUG at <bad filename>:23128!
> invalid operand: 0000 [#1]
> DEBUG_PAGEALLOC
> EIP is at kfree_debugcheck+0x45/0x50
> 
> Stack dump shows lots of ext3 cache and inode functions...
> 

Can you post a full serial console output of second kernel? That would help.

Thanks
Vivek

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