On 10/07/2010 11:29 AM, Luis R. Rodriguez wrote:
On Thu, Oct 7, 2010 at 11:14 AM, Johannes Berg
<johannes@xxxxxxxxxxxxxxxx> wrote:
On Thu, 2010-10-07 at 10:33 -0700, Ben Greear wrote:
In case it helps, here is a dump of where the corrupted SKB was deleted.
I wonder, do you have a machine with a decent IOMMU? Adding IOMMU
debugging into the mix could help you figure out if it's a DMA problem.
Ben, how much traffic are you RX'ing on these virtual interfaces?
I disabled my user-space application, and this script alone can reproduce
the problem fairly quickly on my system. You will need to change some
of those first variables. Just start it and wait a few minutes and
watch the splats show on the console :)
Note that I am not generating any traffic, but the wpa_supplicants are
doing their thing of course...
I'm using the kernel found here:
http://dmz2.candelatech.com/git/gitweb.cgi?p=linux.wireless-testing.ct/.git;a=summary
It's latest wireless-testing with some of my own patches, and some
I've gathered from here an there. I doubt I'm causing this problem,
but if you can't reproduce it with this script on your kernels,
I can try with base wireless-testing or whatever you are using.
#!/usr/bin/perl
use strict;
my $iw = "./local/sbin/iw";
my $ip = "./local/sbin/ip";
my $wpa_s = "./local/bin/wpa_supplicant";
my $ssid = "candela-n";
my $key = "wpadmz123";
my $phy = "phy0";
my $max = 32;
my $i;
my $bmac = "00:01:02:03:04:";
my $cmd;
# Create stations
for ($i = 0; $i<$max; $i++) {
runCmd("$iw phy $phy interface add sta$i type station");
my $mc5 = "$i";
if (length($mc5) == 1) {
$mc5 = "0$mc5"; # pad mac octet
}
my $mac = "$bmac$mc5";
runCmd("$ip link set sta$i address $mac");
runCmd("$iw dev sta$i set power_save off");
}
# Bring them up with WPA
for ($i = 0; $i<$max; $i++) {
open(FD, ">sta$i" . "_wpa.conf") || die("Couldn't open file: $!\n");
print FD "
ctrl_interface=/var/run/wpa_supplicant
fast_reauth=1
#can_scan_one=1
network={
ssid=\"$ssid\"
proto=WPA
key_mgmt=WPA-PSK
psk=\"$key\"
pairwise=TKIP CCMP
group=TKIP CCMP
}
";
runCmd("$wpa_s -B -i sta$i -c sta$i" . "_wpa.conf -P sta$i" . "_wpa.pid -t -f sta$i" . "_wpa.log");
}
sub runCmd {
my $cmd = shift;
print "$cmd\n";
`$cmd`;
}
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
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