#8667 HIGH 8.2.1: wpa_supplicant generates many redundant scan requests before associating

[Zarro Boogs per Child]

#8667: wpa_supplicant generates many redundant scan requests before associating
------------------------+---------------------------------------------------
   Reporter:  jcardona  |       Owner:  dsaxena      
       Type:  defect    |      Status:  new          
   Priority:  high      |   Milestone:  8.2.1        
  Component:  wireless  |     Version:  not specified
 Resolution:            |    Keywords:               
Next_action:  package   |    Verified:  0            
  Blockedby:            |    Blocking:               
------------------------+---------------------------------------------------
Changes (by carrano):

 * cc: ashishs (added)


Comment:

 Analyzing the failing scans from
 [http://dev.laptop.org/attachment/ticket/8667/scan.fail.tgz this log] one
 thing that caught my attention is that among the last messages you'll
 almost always find at the end of the output:

 {{{
 ADDRCONF(NETDEV_CHANGE): msh0: link becomes ready
 }}}


 This happened in 6 of the 7 fails reported bellow:


 {{{
 for i in scan.fail.*; do echo $i; grep -v olpc- $i | tail -n 6; done

 scan.fail.1
 [ 1228.616204] libertas scan: got mesh IE
 [ 1228.616230] libertas scan: SCAN_RESP: BSSID 02:2c:bc:96:dd:89
 [ 1228.616283] libertas scan: scanning 4 of 9 channels
 [ 1229.065121] libertas scan: SCAN_RESP: bssdescriptsize 0
 [ 1229.065153] libertas scan: SCAN_RESP: scan results 0
 [ 1229.065206] libertas scan: scanning 4 of 5 channels
 scan.fail.2
 [ 1503.809944] libertas scan: SCAN_RESP: scan results 0
 [ 1503.809944] libertas scan: scanning 1 of 1 channels
 [ 1503.930637] libertas scan: SCAN_RESP: bssdescriptsize 0
 [ 1503.930637] libertas scan: SCAN_RESP: scan results 0
 [ 1503.930637] libertas scan: scan table:
 [ 1503.930637] ADDRCONF(NETDEV_CHANGE): msh0: link becomes ready
 scan.fail.3
 [ 1573.899593] libertas scan: SCAN_RESP: scan results 0
 [ 1573.899593] libertas scan: scanning 1 of 1 channels
 [ 1574.020817] libertas scan: SCAN_RESP: bssdescriptsize 0
 [ 1574.020817] libertas scan: SCAN_RESP: scan results 0
 [ 1574.020817] libertas scan: scan table:
 [ 1574.020817] ADDRCONF(NETDEV_CHANGE): msh0: link becomes ready
 scan.fail.4
 [ 2101.752710] libertas scan: scanning 1 of 1 channels
 [ 2101.874709] libertas scan: SCAN_RESP: bssdescriptsize 0
 [ 2101.874709] libertas scan: SCAN_RESP: scan results 0
 [ 2101.874709] libertas scan: scan table:
 [ 2101.874709] ADDRCONF(NETDEV_CHANGE): msh0: link becomes ready
 [ 2112.895701] msh0: no IPv6 routers present
 scan.fail.5
 [ 2149.298615] libertas scan: scanning 1 of 1 channels
 [ 2149.422407] libertas scan: SCAN_RESP: bssdescriptsize 0
 [ 2149.422440] libertas scan: SCAN_RESP: scan results 0
 [ 2149.422516] libertas scan: scan table:
 [ 2149.423202] ADDRCONF(NETDEV_CHANGE): msh0: link becomes ready
 [ 2160.405694] msh0: no IPv6 routers present
 scan.fail.6
 [ 2172.706742] libertas scan: scanning 1 of 1 channels
 [ 2172.823242] libertas scan: SCAN_RESP: bssdescriptsize 0
 [ 2172.823654] libertas scan: SCAN_RESP: scan results 0
 [ 2172.825204] libertas scan: scan table:
 [ 2172.825416] ADDRCONF(NETDEV_CHANGE): msh0: link becomes ready
 [ 2183.093512] msh0: no IPv6 routers present
 scan.fail.7
 [ 2218.281645] libertas scan: SCAN_RESP: scan results 0
 [ 2218.281645] libertas scan: scanning 1 of 1 channels
 [ 2218.399022] libertas scan: SCAN_RESP: bssdescriptsize 0
 [ 2218.399055] libertas scan: SCAN_RESP: scan results 0
 [ 2218.404603] libertas scan: scan table:
 [ 2218.405089] ADDRCONF(NETDEV_CHANGE): msh0: link becomes ready
 }}}

-- 
Ticket URL: <http://dev.laptop.org/ticket/8667#comment:11>
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