Red Hat Bugzilla – Bug 123932
(USB EHCI) Immediate freeze after cat /dev/dsp
Last modified: 2015-01-04 17:06:10 EST
Description of problem:
Doing "cat /dev/dsp" freezes the system instantly and completely.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Boot Fedora Core 2.
2. Type "cat /dev/dsp" in a Terminal window
3. Observe how mouse cursor doesn't move anymore
A pile of DSP garbage in the Terminal window.
The /dev/dsp should normally correspond to my USB soundcard, which for
some unknown reason gets installed as the first card.
The USB module is connected to a USB2.0 hub.
This same hardware setup works great with kernel 2.4.22 and alsa-1.0.4.
[12:49] localhost:/proc/asound/oss>cat sndstat
Sound Driver:3.8.1a-980706 (ALSA v1.0.4rc2 emulation code)
Kernel: Linux localhost.localdomain 2.6.5-1.358 #1 Sat May 8 09:04:50
EDT 2004 i686
Config options: 0
Type 10: ALSA emulation
Micronas GN Netcom USB Digital Audio at usb-0000:00:1d.7-1.1, full speed
Intel 82801DB-ICH4 at 0xd4000000, irq 6
Audio devices: NOT ENABLED IN CONFIG
Synth devices: NOT ENABLED IN CONFIG
Midi devices: NOT ENABLED IN CONFIG
7: system timer
0: USB Mixer
1: Analog Devices AD1980
Reproduced also with Linux 2.6.6.
rmmod ehci_hcd fixes the problem, no freezes occur when only uhci_hcd
Fedora Core 2 has now reached end of life, and no further updates will be
provided by Red Hat. The Fedora legacy project will be producing further kernel
updates for security problems only.
If this bug has not been fixed in the latest Fedora Core 2 update kernel, please
try to reproduce it under Fedora Core 3, and reopen if necessary, changing the
product version accordingly.