Latest working kernel version: 2.6.24.3
Earliest failing kernel version: 2.6.25-rc1
Distribution: Archlinux
Hardware Environment: RaLink RT2500 802.11g Cardbus/mini-PCI (rev 01)
Software Environment: 
Problem Description:

With rt2x00-2.0.14 my laptop freezes instantly when I start wpa_supplicant:

root@jan ~ # wpa_supplicant -dd -Dwext -iwlan0 -c/etc/wpa_supplicant.conf
Initializing interface 'wlan0' conf '/etc/wpa_supplicant.conf' driver 'wext' ctrl_interface 'N/A' bridge 'N/A'
Configuration file '/etc/wpa_supplicant.conf' -> '/etc/wpa_supplicant.conf'
Reading configuration file '/etc/wpa_supplicant.conf'
ctrl_interface='/var/run/wpa_supplicant'
eapol_version=1
ap_scan=1
fast_reauth=1
Line: 433 - start of a new network block
ssid - hexdump_ascii(len=9):
     68 61 72 72 69 62 65 72 74                        harribert       
PSK (ASCII passphrase) - hexdump_ascii(len=63): [REMOVED]



I tried rt2x00-2.1.0 (from 2.6.24-zen3) and got a little further (logs attached). It doesn't freeze anymore but still segfaults.