linux-kernel - RE: cifs causes BUG: soft lockup detected on CPU

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Date:	Thu, 29 Mar 2007 11:35:13 +0200
From:	"Valentin Zaharov" <karlos_@...vision.net.il>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	<linux-kernel@...r.kernel.org>,
	"Steven French" <sfrench@...ibm.com>
Subject: RE: cifs causes BUG: soft lockup detected on CPU

I get this error when try to apply the patch:

patch -p1 < cifs.patch
patching file include/linux/fs.h
patch: **** malformed patch at line 26: /*

Am I missing something or patch is bad?  

Thanks in advance

-----Original Message-----
From: Andrew Morton [mailto:akpm@...ux-foundation.org] 
Sent: Thursday, March 29, 2007 11:22 AM
To: Valentin Zaharov
Cc: linux-kernel@...r.kernel.org; Steven French
Subject: Re: cifs causes BUG: soft lockup detected on CPU

On Thu, 29 Mar 2007 11:13:04 +0200 "Valentin Zaharov"
<karlos_@...vision.net.il> wrote:

> I've tried different kernel versions.
> Right now iam using generic 2.6.9-42 on one machine and 2.6.20.1 on 
> another one.
> I also tried various distributions ( Suse, CentOS, RHEL4 ) - not sure 
> it is relevant.
> Tried installing latest cifs modules, tried changing CIFSMaxBufSize to

> 15000,  without luck.
> Freezes are totally random - sometimes they happen 2-4 times a day, 
> sometimes it can take 2 weeks.

Yeah, it's a relatively recently known-bug, I'm afraid.

Probably this will keep you out of trouble until it gets fixed for real:

--- a/include/linux/fs.h~a
+++ a/include/linux/fs.h
@@ -627,25 +627,7 @@ extern void inode_double_unlock(struct i
  */
 static inline loff_t i_size_read(const struct inode *inode)  { -#if
BITS_PER_LONG==32 && defined(CONFIG_SMP)
-	loff_t i_size;
-	unsigned int seq;
-
-	do {
-		seq = read_seqcount_begin(&inode->i_size_seqcount);
-		i_size = inode->i_size;
-	} while (read_seqcount_retry(&inode->i_size_seqcount, seq));
-	return i_size;
-#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
-	loff_t i_size;
-
-	preempt_disable();
-	i_size = inode->i_size;
-	preempt_enable();
-	return i_size;
-#else
 	return inode->i_size;
-#endif
 }
 
 /*
_

-
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