Ubuntu
linux package

iwlagn stops transferring after few MB data transfer at 5GHz 11n mode

Bug #549223 reported by Mario Sánchez Prada
30
This bug affects 6 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Fix Released
Undecided
Unassigned

Bug Description

As described in https://bugzilla.redhat.com/show_bug.cgi?id=571753, same problem was observed in ubuntu lucid lynx today:

Description of problem:
iwlagn stops transferring all data after few MB data transfer at 5GHz 11n mode.
For example, while viewing some web pages, all data transferring are stopped.

Version-Release number of the distribution:
Description: Ubuntu lucid (development branch)
Release: 10.04

Version-Release number of selected component (if applicable):
Linux 2.6.32-17-generic i686 GNU/Linux

How reproducible:

Steps to Reproduce:
1. connect AP with 5GHz 11n mode.
2. transfer some MBytes data. (ex. viewing some web pages)
3. all data transfer are stopped. ping fails sending data with message "ping:
sendmsg: No buffer space available". You can also realize of this problem by observing a iwl_tx_agg_start message like this one in the output of 'dmesg':
[ 676.468986] iwlagn 0000:03:00.0: iwl_tx_agg_start on ra = 00:23:69:26:cd:24 tid = 0

Actual results:
All data transferring are stopped.

Expected results:
All data transferring are continued.

Additional info:

Original description at:
https://bugzilla.redhat.com/show_bug.cgi?id=571753

The same problem is also describd in this (duplicate) bug:
https://bugzilla.redhat.com/show_bug.cgi?id=574885

See original description
Mario Sánchez Prada (mariospr)
description: updated
Jeremy Foshee (jeremyfoshee)
tags: added: kernel-series-unknown
Revision history for this message
Roland Dreier (roland.dreier) wrote :

Same issue still here (Thinkpad X200 with Intel 5300 wifi), even with 64-bit kernel from linux-image-2.6.32-21-generic.

Revision history for this message
Jeremy Foshee (jeremyfoshee) wrote :

Hi Mario,

Please be sure to confirm this issue exists with the latest development release of Ubuntu. ISO CD images are available from http://cdimage.ubuntu.com/releases/ . If the issue remains, please run the following command from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p linux 549223

Also, if you could 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-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

    [This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

tags: added: needs-kernel-logs
tags: added: needs-upstream-testing
tags: added: kj-triage
Changed in linux (Ubuntu):
status: New → Incomplete
Revision history for this message
Mario Sánchez Prada (mariospr) wrote :

> Hi Mario,
>
> Please be sure to confirm this issue exists with the latest development release of Ubuntu. ISO CD images are available from
> http://cdimage.ubuntu.com/releases/ .

I can't reproduce the bug with latest release of Lucid Lynx (updated 5 min ago!). This is the output of uname -ar:

Linux 2.6.32-21-generic #32-Ubuntu SMP Fri Apr 16 08:10:02 UTC 2010 i686 GNU/Linux

Thanks!

Revision history for this message
Jeremy Foshee (jeremyfoshee) wrote :

Mario,
    That is great news! :-)

Roland,
    Are you still seeing the issue?

Thanks!

~JFo

Revision history for this message
Roland Dreier (roland.dreier) wrote :

Seems to work here now as well. Not sure what changed, as I definitely did see the problem with the same Lucid 2.6.32-21 kernel just a week ago. Odd.

Revision history for this message
Jeremy Foshee (jeremyfoshee) wrote :

I've set the bug as Fix Released. If you see it again, it is an easy thing to change the status of the bug and let me know via comment.

Thanks!

~JFo

Changed in linux (Ubuntu):
status: Incomplete → Fix Released
Revision history for this message
Mario Sánchez Prada (mariospr) wrote :

Great job. Thanks!

I can confirm, once again, that it works like a charm, as I was using my wireless N network for several hours with no problem at all.

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