Bug 195348 - IP traffic through wifi get stuck on each background scan every five minutes
Summary: IP traffic through wifi get stuck on each background scan every five minutes
Status: Closed Overcome By Events
Alias: None
Product: Base System
Classification: Unclassified
Component: wireless (show other bugs)
Version: CURRENT
Hardware: i386 Any
: --- Affects Some People
Assignee: freebsd-wireless (Nobody)
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-11-24 20:30 UTC by Matthias Apitz
Modified: 2021-01-16 23:12 UTC (History)
2 users (show)

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Description Matthias Apitz 2014-11-24 20:30:18 UTC 
The problem is reproducible fine: I'm running in a loop SCP traffic up
and down to my ISP host; when the background scan every five minutes
takes place the traffic gets STALLED and IP comes not to work again:

Nov 23 17:13:33 unixarea dhclient: New Broadcast Address (wlan0): 192.168.2.255
Nov 23 17:13:33 unixarea dhclient: New Routers (wlan0): 192.168.2.1
Nov 23 17:18:33 unixarea kernel: wlan0: ieee80211_bg_scan: active scan, ticks 36537257 duration 150
Nov 23 17:18:33 unixarea kernel: wlan0: [00:13:f7:0d:08:48] sta power save mode on
Nov 23 17:18:33 unixarea kernel: wlan0: scan_task: chan   7g ->   1g [active, dwell min 20ms max 150ms]
Nov 23 17:18:33 unixarea kernel: wlan0: scan_task: stopped, [ticks 36537415, dwell min 20 scanend 36537408]

from now the interface does not let pass frames anymore

Nov 23 17:18:33 unixarea kernel: wlan0: ieee80211_sta_tim_notify: TIM=1
Nov 23 17:18:34 unixarea last message repeated 3 times
Nov 23 17:18:34 unixarea kernel: wlan0: [00:13:f7:0d:08:48] save frame with age 40, 1 now queued
Nov 23 17:18:34 unixarea kernel: wlan0: [00:13:f7:0d:08:48] save frame with age 0, 2 now queued
Nov 23 17:18:34 unixarea kernel: wlan0: ieee80211_sta_tim_notify: TIM=1
Nov 23 17:18:35 unixarea last message repeated 14 times
Nov 23 17:18:35 unixarea kernel: wlan0: [00:13:f7:0d:08:48] save frame with age 0, 3 now queued
Nov 23 17:18:35 unixarea kernel: wlan0: ieee80211_sta_tim_notify: TIM=1
...

I tested the same in an older 10-ALPHA4 laptop (running r255948 from
October 2013) with the same physical WLAN card; there is no problem with
the bg scans every 5 minutes, it just goes ahead after any scan; this is
an issue in head.