linux-kernel - Re: [BUG] 2.6.24-rc3-git2 softlockup detected

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Message-ID: <474FBB86.5000004@linux.vnet.ibm.com>
Date:	Fri, 30 Nov 2007 12:58:06 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Kyle McMartin <kyle@...artin.ca>,
	LKML <linux-kernel@...r.kernel.org>, linuxppc-dev@...abs.org,
	Andy Whitcroft <apw@...dowen.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	linux-scsi@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Wilcox <willy@...ian.org>
Subject: Re: [BUG] 2.6.24-rc3-git2 softlockup detected

Andrew Morton wrote:
> On Thu, 29 Nov 2007 23:00:47 -0800 Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
>> On Fri, 30 Nov 2007 01:39:29 -0500 Kyle McMartin <kyle@...artin.ca> wrote:
>>
>>> On Thu, Nov 29, 2007 at 12:35:33AM -0800, Andrew Morton wrote:
>>>> ten million is close enough to infinity for me to assume that we broke the
>>>> driver and that's never going to terminate.
>>>>
>>> how about this? doesn't break things on my pa8800:
>>>
>>> diff --git a/drivers/scsi/sym53c8xx_2/sym_hipd.c b/drivers/scsi/sym53c8xx_2/sym_hipd.c
>>> index 463f119..ef01cb1 100644
>>> --- a/drivers/scsi/sym53c8xx_2/sym_hipd.c
>>> +++ b/drivers/scsi/sym53c8xx_2/sym_hipd.c
>>> @@ -1037,10 +1037,13 @@ restart_test:
>>>  	/*
>>>  	 *  Wait 'til done (with timeout)
>>>  	 */
>>> -	for (i=0; i<SYM_SNOOP_TIMEOUT; i++)
>>> +	do {	
>>>  		if (INB(np, nc_istat) & (INTF|SIP|DIP))
>>>  			break;
>>> -	if (i>=SYM_SNOOP_TIMEOUT) {
>>> +		msleep(10);
>>> +	} while (i++ < SYM_SNOOP_TIMEOUT);
>>> +
>>> +	if (i >= SYM_SNOOP_TIMEOUT) {
>>>  		printf ("CACHE TEST FAILED: timeout.\n");
>>>  		return (0x20);
>>>  	}
>>> diff --git a/drivers/scsi/sym53c8xx_2/sym_hipd.h b/drivers/scsi/sym53c8xx_2/sym_hipd.h
>>> index ad07880..85c483b 100644
>>> --- a/drivers/scsi/sym53c8xx_2/sym_hipd.h
>>> +++ b/drivers/scsi/sym53c8xx_2/sym_hipd.h
>>> @@ -339,7 +339,7 @@
>>>  /*
>>>   *  Misc.
>>>   */
>>> -#define SYM_SNOOP_TIMEOUT (10000000)
>>> +#define SYM_SNOOP_TIMEOUT (1000)
>>>  #define BUS_8_BIT	0
>>>  #define BUS_16_BIT	1
>>>  
>> That might be the fix, but do we know what we're actually fixing?  afaik
>> 2.6.24-rc3 doesn't get this timeout, 2.6.24-rc3-mm2 does get it and we
>> don't know why?
>>
> 
> <looks at Subject:>
> 
> <Checks that Rafael was cc'ed>
> 
> So 2.6.24-rc3 was OK and 2.6.24-rc3-git2 is not?

Yes, the 2.6.24-rc3 was Ok and this is seen from 2.6.24-rc3-git2/3/4.

-- 
Thanks & Regards,
Kamalesh Babulal,
Linux Technology Center,
IBM, ISTL.
-
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