NetBSD Problem Report #50045

From www@NetBSD.org  Sun Jul 12 12:53:51 2015
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Date: Sun, 12 Jul 2015 12:53:49 +0000 (UTC)
From: pbraun@nethence.com
Reply-To: pbraun@nethence.com
To: gnats-bugs@NetBSD.org
Subject: wpa_supplicant unreliable, dropping connections
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>Number:         50045
>Category:       bin
>Synopsis:       wpa_supplicant unreliable, dropping connections
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jul 12 12:55:00 +0000 2015
>Last-Modified:  Tue Jul 14 01:25:00 +0000 2015
>Originator:     pierre-philipp
>Release:        7.0_RC1 and current
>Organization:
Nethence
>Environment:
tested with 7.0_RC1 kernel & user land
tested with current (2015 07 10) kernel & user land
probably with older releases also
>Description:
Very similar to problem report 32536
http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=32536

Using wpa supplicant, the connection drops when I download something, i.e. pkg_add some package remotely with PKG_PATH pointing to my nearest mirror in my country.  It seems to happens when ever there is high traffic as mentionned in the other problem report.  I do not do any ssl tunnel and I get the same trouble.

I use the wpi driver.  If you want I will try with some atheros card eventually to see if it also happens with it.  I don't know if it is related to the driver, wpa_supplicant or something else. Nothing appears in the logs, just no network when it's heavily sollicitated.

I tried wpa supplicant on FreeBSD 10.1 release and there is no issue with it, it holds the load just fine. Too bad I would like to use NetBSD on that laptop. Thank you.
>How-To-Repeat:
wpa_supplicant.conf:
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel

network={
        ssid="MYWLAN"
        scan_ssid=1
        key_mgmt=WPA-PSK
        psk="MySecretPassphrase"
}

called with:
wpa_supplicant -B -i wpi0 -c /etc/wpa_supplicant.conf
dhclient wpi0

The AP provides WPA/WPA2 AES-TKIP.
>Fix:

>Audit-Trail:
From: David Young <dyoung@pobox.com>
To: gnats-bugs@NetBSD.org
Cc: gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Subject: Re: bin/50045: wpa_supplicant unreliable, dropping connections
Date: Sun, 12 Jul 2015 14:38:13 -0500

 On Sun, Jul 12, 2015 at 12:55:00PM +0000, pbraun@nethence.com wrote:
 > >Number:         50045
 > >Category:       bin
 > >Synopsis:       wpa_supplicant unreliable, dropping connections
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    bin-bug-people
 > >State:          open
 > >Class:          sw-bug
 > >Submitter-Id:   net
 > >Arrival-Date:   Sun Jul 12 12:55:00 +0000 2015
 > >Originator:     pierre-philipp
 > >Release:        7.0_RC1 and current
 > >Organization:
 > Nethence
 > >Environment:
 > tested with 7.0_RC1 kernel & user land
 > tested with current (2015 07 10) kernel & user land
 > probably with older releases also
 > >Description:
 > Very similar to problem report 32536
 > http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=32536
 > 
 > Using wpa supplicant, the connection drops when I download something, i.e. pkg_add some package remotely with PKG_PATH pointing to my nearest mirror in my country.  It seems to happens when ever there is high traffic as mentionned in the other problem report.  I do not do any ssl tunnel and I get the same trouble.

 Perhaps renewal of security associations is timing out because of delays
 caused by buffer bloat in the driver?  That might be worth a look.  Does
 latency (measured by a ping) get very high?

 Dave

 -- 
 David Young
 dyoung@pobox.com    Urbana, IL    (217) 721-9981

From: pierre-philipp braun <pbraun@nethence.com>
To: gnats-bugs@NetBSD.org
Cc: gnats-admin@netbsd.org,  netbsd-bugs@netbsd.org
Subject: Re: bin/50045: wpa_supplicant unreliable, dropping connections
Date: Tue, 14 Jul 2015 03:23:12 +0200

 >  Perhaps renewal of security associations is timing out because of delays
 >  caused by buffer bloat in the driver?  That might be worth a look.  Does
 >  latency (measured by a ping) get very high?

 Yes it used to happen, I remember seeing ping responses up to 1900ms 
 instead of usual ~22ms.  However, today, what I get is just a *skip* of 
 ping sequences until I break (^C) the process requesting to much 
 traffic.  For example skipping ping probes from 510 to 523:
 64 bytes from x.x.x.x: icmp_seq=509 ttl=56 time=22.900188 ms
 64 bytes from x.x.x.x: icmp_seq=524 ttl=56 time=22.311495 ms

 uname -a:
 NetBSD Host-001 7.99.19 NetBSD 7.99.19 (GENERIC.201507090800Z) #0: Thu 
 Jul  9 08:50:21 UTC 2015 
 builds@b45.netbsd.org:/home/builds/ab/HEAD/amd64/201507090800Z-obj/home/source/ab/HEAD/src/sys/arch/amd64/compile/GENERIC 
 amd64

 When I break the pkg_add process fetching the binary from a near mirror, 
 the ping probes now resume!  So the WPA supplicant seems to be rather 
 more self-healing in -current.  Are there actually changes since 7.0_RC1 
 and current 2015-07-09?  As far as I can remember this didn't happen 
 before so I can only assume it's related to my userland upgrade.  For 
 the pings being skipped instead of getting high response time, however, 
 I don't know.

 Thanks

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