Bug seems to have been fixed in linux-backports-modules-
wireless-2.6.32-24-generic per #22 and #25. Closing
** Changed in: linux (Ubuntu)
Status: Incomplete => Fix Released
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Sorry Manoj, I just saw that I never replied with the final results.
We had linux-backports-modules-wireless-2.6.32-24-generic in production
on a few thousand devices with the AR9285 chipset through probably
December 2012 with no issues.
Thanks again,
-Jack
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Oops. Forgot to mention:
Linux version 3.2.27+ (dc4@dc4-arm-01) (gcc version 4.7.2 20120731 (prerelease)
(crosstool-NG linaro-1.13.1+bzr2458 - Linaro GCC 2012.08) ) #114 PREEMPT Tue
Sep 4 00:15:33 BST 2012
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FYI,
I'm getting VERY similar errors on my raspberry pi with an
Bus 001 Device 004: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n
WLAN Adapter
To me this sounds as if the "ath" driver is not at fault, but something else.
The fact that the older laptop DOES suffer this problem and
After a long run with the snapshot, finally getting around to testing
the backport (linux-backports-modules-wireless-2.6.32-24-generic now).
Will probably take a couple of weeks to complete testing.
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Can you please try the package linux-backports-modules-
wireless-2.6.32-23-generic and report if that fixes you problem ?
** Changed in: linux (Ubuntu)
Status: Triaged => Incomplete
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Manoj Iyer (manjo)
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ath9k module causing MI
Problem seems to be resolved in the 2010-06-17 snapshot of compat-
wireless.
http://wireless.kernel.org/download/compat-wireless-2.6/compat-
wireless-2010-06-17.tar.bz2
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ath9k module causing MIC challenge failures
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** Tags removed: kernel-candidate
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ath9k module causing MIC challenge failures
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** Tags added: kernel-candidate kernel-reviewed
** Tags removed: kernel-needs-review
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It looks like the issue is in ath9k reporting a one of the received
broadcast data frames (likely the first one after the group keys have
been set or are in the process of being set) as a decrypted frame even
when the data is not really correctly decrypted. mac80211 will then
process the frame and
Thanks. For some reason, this issue does not seem to show up on my main
laptop, but once I started testing with an older (and quite a bit
slower) laptop, I was able to reproduce the issue. I'm now able to
reproduce it at will within couple of minutes by using just that single
laptop and a continuou
Log from Apple AirPort.
** Attachment added: "ectest_10 Log.txt"
http://launchpadlibrarian.net/49285307/ectest_10%20Log.txt
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ath9k module causing MIC challenge failures
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Worked like a charm. Cycled the interface on two stations once every 30
seconds before going to lunch, about 15 MIC failures in the last hour
and ten or so.
Station 1c:4b:d6:a3:7a:b4 generated three of them. Syslog from station
attached, with log from AP to follow. First failure about 13:32
local
Thanks Jouni.
Absolutely. It's been a while since I've done a kernel patch and
compile, but I suspect it's like riding a bike.
I have not had a "natural" MIC failure yet this morning, but I've also
been thinking about the most graceful way to generate it. I suspect
with maybe three clients, two
Thanks. Based on the information here so far, this looks likely to be a
race condition in either ath9k or mac80211 which would end up in
triggering incorrect Michael MIC failure event immediately after the
group key is configured (i.e., a broadcast frame being received from the
AP at more or less t
Thanks, Jouni. I see you're correct regarding the countermeasures not
being triggered in that log.
There are actually two different scenarios that may or may not be
related: the MIC failures when multiple stations are associated within a
tight window, and the periodic MIC failures when stations ar
Regarding comment #7: The AP did not detect Michael MIC failure in that
case at May 26 13:10:02; only one of the associated stations did. As
such, this by itself should not trigger TKIP countermeasures. In fact,
the AP would not be detecting Michael MIC failures in this kind of setup
if all the ass
Retest with nine clients generated a MIC failure in 3 hours 55 minutes.
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** Changed in: linux (Ubuntu)
Importance: Undecided => High
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Test with nine clients generated a MIC failure in 2 hours 37 minutes.
Retesting.
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Completed 16-hour test with four clients and no MIC failures. Will do
another 16-hour test with nine clients.
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Based on some info from the ath9k-devel mailing list ( http://www.mail-
archive.com/ath9k-de...@lists.ath9k.org/msg02724.html ), confirmed that
power management is off on the interface.
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Continuing to test 2.6.34-999-generic. Had a client generate a MIC
failure after several hours of continuous connectivity.
Most interesting is cross-correlating the logs between the access point
(in this case an Apple AirPort) and the client that caused the MIC
failure.
Access point:
May 26 13:1
I have not been able to reproduce the bug with our Broadcom-based
devices, but I'm open to ideas. Does anyone believe it's possible the
bug is with wpa_supplicant?
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** Tags added: kernel-needs-review kernel-net
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Tested using 30 machines updated to the latest BIOS version, first with
kernel 2.6.31-19-generic (UNR 9.10), then with 2.6.34-999-generic (UNE
10.04), still generating MIC failures.
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I was reluctant to believe it would affect the outcome, but I can't deny
the data. With feedback from ASUS, updated the BIOS to the latest
version (1401) and initial tests with kernel build 2.6.34-999-generic
are looking good. Will do wider tests tomorrow against UNR 9.10 (30-60
machines) and like
** Changed in: linux (Ubuntu)
Status: Incomplete => Triaged
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Confirmed bug exists in kerne 2.6.34-999-generic build date
201005121008.
** Tags removed: needs-upstream-testing
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Hi Jack,
If you could also please test the latest upstream kernel available that would
be great. It will allow additional upstream developers to examine the issue.
Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the
upstream kernel, please remove the 'needs-upstrea
** Attachment added: "AlsaDevices.txt"
http://launchpadlibrarian.net/48468883/AlsaDevices.txt
** Attachment added: "BootDmesg.txt"
http://launchpadlibrarian.net/48468884/BootDmesg.txt
** Attachment added: "Card0.Amixer.values.txt"
http://launchpadlibrarian.net/48468885/Card0.Amixer.valu
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