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From: Kumar Gala <galak@kernel.crashing.org>
To: Robert Hancock <hancockr@shaw.ca>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.20 kernel hang with USB drive and vfat doing ftruncate
Date: Fri, 16 Feb 2007 23:05:43 -0600	[thread overview]
Message-ID: <92CB3192-9176-4D30-B818-16A9C979F5E9@kernel.crashing.org> (raw)
In-Reply-To: <45D639F3.8030609@shaw.ca>


On Feb 16, 2007, at 5:10 PM, Robert Hancock wrote:

> Kumar Gala wrote:
>> I'm seeing an issue with a stock 2.6.20 kernel running on an  
>> embedded PPC.  I've got a usb flash drive plugged in and the  
>> filesystem on the drive is vfat.  Running with 64M and no swap.
>> If I execute a series of large (100M+) ftruncate() on the disk the  
>> kernel will hang and never return.  It seems to be stuck in the  
>> idle loop().
>
> On FAT filesystems this forces the entire file contents of that  
> size to be written out with zeros. Are you sure the kernel just  
> isn't busy writing out all that data to the disk?

I'm pretty sure, seeing as if I run the test it takes maybe 20-30  
seconds to create the file if it succeeds.  However, I've weighted 10  
minutes and still no prompt.

I'm also able to break in with a HW debugger and am always in the  
idle loop.

- k

  reply	other threads:[~2007-02-17  5:06 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <fa.bxsB54F+7+006rE+o/VWUj5keQk@ifi.uio.no>
2007-02-16 23:10 ` 2.6.20 kernel hang with USB drive and vfat doing ftruncate Robert Hancock
2007-02-17  5:05   ` Kumar Gala [this message]
     [not found] ` <fa.zK5W70l1vhk1YNxuwxFwZ8t1uIs@ifi.uio.no>
     [not found]   ` <fa.qFxa41A3LU3cQ19L+5DTEFMtCEY@ifi.uio.no>
2007-02-20  5:28     ` Robert Hancock
2007-02-16 19:54 Kumar Gala
2007-02-18 16:10 ` OGAWA Hirofumi
2007-02-19 21:58   ` Kumar Gala
2007-02-19 22:19     ` OGAWA Hirofumi
2007-02-19 22:27       ` Kumar Gala
2007-02-20 17:20         ` OGAWA Hirofumi
2007-02-19 22:06   ` Kumar Gala
2007-02-21 20:18     ` OGAWA Hirofumi
2007-02-21 20:57       ` Andrew Morton

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