Re: wpa_supplicant craps out under heavy load

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Bill Davidsen wrote:
Justin P. Mattock wrote:
I've noticed this with ubuntu about a year ago,
and now I see this with redhat(fedora)

under wpa_supplicant.log I see:

CTRL-EVENT-CONNECTED - Connection to xx:xx:xx:xx:xx:xx completed (auth)
[id=0 id_str=]
CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys
Trying to associate with xx:xx:xx:xx:xx:xx (SSID='XX' freq=2422 MHz)
Association request to the driver failed
Associated with xx:xx:xx:xx:xx:xx
CTRL-EVENT-CONNECTED - Connection to xx:xx:xx:xx:xx:xx completed
(reauth) [id=0 id_str=]
CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys
Trying to associate with xx:xx:xx:xx:xx:xx (SSID='XX' freq=2422 MHz)
Association request to the driver failed
Associated with xx:xx:xx:xx:xx:xx
CTRL-EVENT-CONNECTED - Connection to xx:xx:xx:xx:xx:xx completed
(reauth) [id=0 id_str=]
CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys
Trying to associate with xx:xx:xx:xx:xx:xx (SSID='XX' freq=2422 MHz)
Association request to the driver failed
Associated with xx:xx:xx:xx:xx


the above is caused probably all the time, but not noticeable until
heavy load.

The system becomes vary sluggish, hulu craps out, radio craps out
(not fun)...

When you say heavy load, do you mean heavy network load (traffic) or system load (CPU)? I think there are timeouts in the key exchange which might fail if the system were really loaded. Then again that probably wouldn't effect established connections. The snippet below looks as if the connection was dropping and resetting, may be a driver issue.
After disabling NetworkManager and compiling wpa_supplicant from
the source(using the default .config they supply for compiling)

wpa_supplicant looks like this:

[[email protected] wpa_supplicant]$
sudo /home/name/Sources/wpa_supplicant-0.6.9/wpa_supplicant/wpa_supplicant -Dwext -ieth1 -c /home/name/wpa CTRL-EVENT-SCAN-RESULTS Trying to associate with xx:xx:xx:xx:xx:xx (SSID='XX' freq=2422 MHz)
ioctl[SIOCSIWAP]: Device or resource busy
Association request to the driver failed
Associated with xx:xx:xx:xx:xx:xx
CTRL-EVENT-CONNECTED - Connection to xx:xx:xx:xx:xx:xx completed (auth)
[id=0 id_str=]

still shows some errors, but I'm able to stream music, plus watch movies
without having a sluggish system, nor having stuckage of internet.

I would file a bug, but there probably already is, since this is
something I've seen for some time now right!

Justin P. Mattock

Using a humble old Celeron laptop and FC11, doing
  ssh host2 "dd bs=5k count=50k" </dev/zero >/dev/null
doesn't show much CPU in use.

Casual test, one line and 'top' to see who uses CPU.

Thanks for the bug#, will follow there.

heavy load as in internet traffic.
(could be high cpu load as well).

 As for the whole  wpa_supplicant crapping out thing,
I did experience sluggishness  but after looking into it
I think it was readahead. i.g. compiling libc from git went good,
but after a reboot readahead did not like that(segfaulted and gave the
same slow sluggishness as I experienced earlier before a libc compile and install).
After uninstalling readahead the system seems to be stable, but I
probably will hit that
wpa_supplicant thing(if I don't use the source version I compiled).

From what I remember when this happened when I used debian/ubuntu I ended up downgrading wpa_supplicant, and the key exchange reacted as it should(at the moment I dont have a wpa network
but it is happening without encryption as well).

Now worries, just one of those things..

Justin P. Mattock

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