I suffer from the same application hang with usb devices that others
seem to have encountered too. USB devices work fine after bootup, but
after the system has been up a while any application accessing a usb
device hangs. The program does not respond anymore and ps lists its
state as DW. The device is completely hung up at this point, and refuses
to work until a reboot. This problem came with the 2.6.6 kernel version
(the only 2.6.x series kernel I've run on this machine). In 2.4.x it
works fine.

Then I tried with the usbfs unmounted. The problem doesn't occur
anymore. No matter how many days the system stays up, or how many times
the device is accessed by a program, it continues to work as normal.



This almost a vanilla 2.6.6 kernel. Only a lirc patch is applied.

Linux meri 2.6.6 #2 Mon May 24 21:56:18 EEST 2004 i686 athlon i386
GNU/Linux

00:11.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 1b)
00:11.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 1b)
00:11.4 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 1b)

util-linux 2.12(-18) Fedora Core 2.



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