[HTC Sensation] zandgreen:
I haven't found anything worth mentioning yet, here is the log when I try activate tethering with Barnacle Wifi Tether:

WARNING: generic atexit() called from legacy shared library
WIFI: Failed to connect to supplicant: No such file or directory
NAT: restart: Network is down

Here is the logcat:

D/barnacle(10742): WIFI: Could not set freq: Invalid argument
D/barnacle(10742): WIFI: Could not set freq: Invalid argument
W/libc (10742): WARNING: generic atexit() called from legacy shared library
D/barnacle(10742): WIFI: Could not parse /init.rc
D/barnacle(10742): WIFI: Found service: '/system/bin/wpa_supplicant -Dnl80211 -iwlan0 -c /data/misc/wifi/wpa_supplicant.conf' socket: 'wpa_wlan0 dgram 660 wifi wifi'
D/barnacle(10742): WIFI: Created socket '/dev/socket/wpa_wlan0' with mode '660', user '1010', group '1010'
D/barnacle(10742): WIFI: wpa_supplicant custom-started
E/WifiHW (10742): Supplicant not running, cannot connect
I/wpa_supplicant(10744): Successfully initialized wpa_supplicant
E/wpa_supplicant(10744): Failed to open config file '/data/data/net.szym.barnacle/files/wpa.conf', error: Permission denied
E/wpa_supplicant(10744): Failed to read or parse configuration '/data/data/net.szym.barnacle/files/wpa.conf'.
I/ActivityManager( 444): Start proc mobi.mgeek.TunnyBrowser for broadcast mobi.mgeek.TunnyBrowser/com.dolphin.browser.push.http.NetworkStateObserver: pid=10745 uid=10086 gids={50086, 3003, 1015, 1028}
I/BarnacleService( 3775): log: WARNING: generic atexit() called from legacy shared library
I/BarnacleService( 3775): log: WIFI: wpa_supplicant started
I/dalvikvm(10745): Turning on JNI app bug workarounds for target SDK version 6...
E/WifiHW (10742): Supplicant not running, cannot connect
I/ActivityManager( 444): No longer want com.android.voicedialer (pid 8120): empty #17
E/WifiHW (10742): Supplicant not running, cannot connect
D/PicasaUploader(10724): wifiOnlyPhoto changed to true
D/PicasaUploader(10724): wifiOnlyVideo changed to true
D/PicasaUploader(10724): syncOnBattery changed to true
D/PicasaUploaderSync(10724): sync account database
D/PicasaUploaderSync(10724): accounts in DB=1
D/PicasaUploaderSyncManager(10724): active network: NetworkInfo: type: mobile[EDGE], state: CONNECTED/CONNECTED, reason: dataEnabled, extra: free, roaming: true, failover: true, isAvailable: true
D/PicasaUploaderSyncManager(10724): background data: true
D/dalvikvm(10745): GC_CONCURRENT freed 149K, 12% free 2643K/2972K, paused 3ms+65ms, total 101ms
D/barnacle(10742): WIFI: stopping wpa_supplicant
I/BarnacleService( 3775): log: WIFI: Failed to connect to supplicant: No such file or directory
D/PicasaUploaderSyncManager(10724): battery info: true
I/ActivityThread(10745): Pub tunnydownloads: com.dolphin.browser.downloads.DownloadProvider
I/ActivityThread(10745): Pub dolphinbrowserhd: com.dolphin.browser.provider.BrowserProvider
I/ActivityThread(10745): Pub tunnybrowser: mobi.mgeek.TunnyBrowser.BrowserProvider
I/ActivityThread(10745): Pub dolphin_voice_en: com.dolphin.browser.voice.command.VoiceCommandProvider
I/ActivityThread(10745): Pub mobi.mgeek.TunnyBrowser.htmlfileprovider: com.dolphin.browser.provider.FileContentProvider
D/dalvikvm( 3775): GC_CONCURRENT freed 254K, 11% free 3872K/4304K, paused 33ms+4ms, total 70ms
D/dalvikvm(10724): GC_CONCURRENT freed 333K, 19% free 2404K/2948K, paused 3ms+32ms, total 70ms
I/UpdateCheckReceiver(10689): Got connectivity change, has connection: false
D/barnacle(10741): NAT: --- Cleanup --- 0 maps IN: 0 0 OUT: 0 0

When using another WIFI tethering app "WiFi Tether", I get a reboot.