bug in route tables handling triggered by ppp

[Matthew Dillon]

:...
:#/etc/rc.d/ppp-user start
:Starting ppp as "root"
:Warning: Add! route failed: ff02:: errno: Operation not supported
:Warning: tun0: AIFADDR 213.41.166.51 -> 10.0.0.2 returns 0
:#panic: rtrequest1_msghandler: rtrequest table error was not on CPU #0:
:Note: panic took place two seconds after the shell prompted again.
:db> trace
:Debugger(c02cc075) at Debugger+0x3d
:panic(c02d2b07,c9390c5c,0,c5c9fa00,ff808000) at panic+0x162
:rtrequest1_msghandler(c9390c5c) at rtrequest1_msghandler+0x83
:rtable_service_loop(0,0,0,0,0) at rtable_service_loop+0x13
:lwkt_exit() at lkwt_exit
:
:At complete random, i had a look at ppp(8) and found my set ifaddr line
:quite wrong:
:set ifaddr 213.41.166.51 10.0.0.2 255.255.255.0 0.0.0.0
:After fixing that to:
:set ifaddr 213.41.166.51 62.4.16.246 255.255.255.255 213.41.166.51
:i no longer see panics, even in the 100% reproductible case (single-user
:mode), and my route tables are ok. ppp properly adds default routes (i
:have a native ipv6 link, thanks Nerim!), though it still warns about the
:"ff02::" route entry, which i'll investigate later on.
:
:If anyone really want it thoroughly debugged, i can provide informations
:with kgdb instead of a dump, just let me know.
:
:Francis.

    This is going to be hard to find without a dump.  I know there are 
    definitely issues related to the default route and also issues with IPV6.

    That particular panic occurs if a route table request succeeds on cpu #0
    but then fails on cpu #1's route table, indicating a synchronization 
    issue between the replicated route tables.

					-Matt
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>