Re: 2.6.20 kernel hang with USB drive and vfat doing ftruncate

[Kumar Gala <galak@kernel.crashing.org>]

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
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