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

From: Robert Hancock
Date: Fri Feb 16 2007 - 18:14:51 EST

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?

Robert Hancock Saskatoon, SK, Canada
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