[Bug 197498] [net80211]: Setting ssid on running interface in adhoc mode causes panic

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197498

Andriy Voskoboinyk <avos at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|Open                        |In Progress

--- Comment #6 from Andriy Voskoboinyk <avos at freebsd.org> ---
Before https://reviews.freebsd.org/D5145, scanning and <smth> -> INIT (FEXT
REINIT) -> <smth2> state transition were two solid parts. How things were
worked:
1) network.subr executes 'ifconfig <iface> up', INIT -> SCAN (w/ FEXT_REINIT
flag) state transition happens;
2) INIT -> INIT, FEXT_REINIT dropped;
3) INIT -> SCAN, scanning starts (and cannot be interrupted, since
newstate_cb() uses the same taskqueue)
4) network.subr executes hostapd / wpa_supplicant -> interface reinitializes.
5) SCAN -> SCAN (w/ FEXT_REINIT flag); the task was enqueued, but (!) will not
be executed untill scan ends;
6) scan ends (no networks were seen, so it decides to create another one); SCAN
-> RUN state transition is enqueued (FEXT_REINIT is still here, but nstate will
be changed to RUN).
7) newstate_cb() is executed, SCAN -> INIT state transition (everything is
dropped via ieee80211_reset_bss() call).
8) and INIT -> RUN state transition is issued (with corresponding result).

Note: FEXT_REINIT is not added in STA mode, so it's not affected by this bug.

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