This was caused by the unused hostapd instance running after being
re-enabled by mistake. This cause an additional scan result with the
same rank to be seen which would then be connected to by luck of the
draw.
This really needs to be done to many more autotests but since this
one seems to have random failures ensure that all the tests still
run if one fails. In addition add better cleanup for hwsim rules.
This tests ensures IWD disconnects after receiving an association
timeout event. This exposes a current bug where IWD does not
transition to disconnected after an association timeout when
FT-roaming.
This adds another radio so IWD hits the FT failure path after
authentication to the first BSS fails. This causes a wiphy work
item to be rescheduled which previously was unsafe.
The packet loss test had a few problems. First being that the RSSI for
the original BSS was not low enough to change the rank. This meant any
roam was just lucky that the intended BSS was first in the results.
The second problem is timing related, and only happens on UML. Disabling
the rules after the roaming condition sometimes allows IWD to fully
roam and connect before the next state change checks.
A new test which blocks all data frames once connected, then tries
to send 100 packets. This should result in the kernel sending a
packet loss event to userspace, which IWD should react to and roam.
During investigation another separate crash was found. The original is
caused by a disconnect event coming in after a neighbor report scan
was completed (roam failed) during the full roam scan.
The second crash is caused by a disconnect coming in during a full
roam scan when no neighbor report scan was ever issued.
The FT-over-DS test was allowed to fail as it stood. If FT-over-DS
failed it would just do a normal over-Air transition which satisfied
all the checks. To prevent this Authenticate frames are blocked after
the initial connection so if FT-over-DS fails there is no other way
to roam.
With the addition of connect_bssid/roam very few tests actually
require hwsim. Since hwsim can lead to problems with scan results
its best to have it off by default and have each test that needs
it explicitly turn it on.
Tests which previously turned it off have had that option removed.
Tests that do require hwsim still are vulnerable to scan result
problems, so for these tests beacon_int was added to the hostapd
config which seems to help with reliability somewhat.
James Prestwood