misc/87421: KERNEL PANIC: ng_ether +ng_eiface + if_bridge

[Gleb Smirnoff]

The following reply was made to PR kern/87421; it has been noted by GNATS.

From: Gleb Smirnoff <glebius at FreeBSD.org>
To: Chris Dionissopoulos <dionch at freemail.gr>
Cc: thompsa at FreeBSD.org, freebsd-gnats-submit at FreeBSD.org
Subject: Re: misc/87421: KERNEL PANIC: ng_ether +ng_eiface + if_bridge
Date: Tue, 18 Oct 2005 15:26:02 +0400

   Chris,
 
   a few questions:
 
 On Fri, Oct 14, 2005 at 05:29:26AM +0000, Chris Dionissopoulos wrote:
 C> FreeBSD mail.local 6.0-BETA5 FreeBSD 6.0-BETA5 #4: Fri Sep 30 19:10:42 EEST 2005     root at mail.local:/usr/obj/usr/src/sys/MAIL  i386
 C> >Description:
 C>               I get a kernel panic when i'm using if_bridge bridge0 interface with 2 virtuals (ng_eiface) and one physical (xl0). 
 C> The panic message is:
 C> sbflush_locked: cc 0 || mb 0xc1aa2400 || mbcnt 512
 
 Can you please obtain a backtrace, like desribed here:
 
   http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-gdb.html
 
 C> >How-To-Repeat:
 C> kldload ng_ether
 C> kldload ng_eiface
 C> 
 C> #create a bridge & 2 virtuals
 C> ifconfig bridge0 create
 C> ngctl mkpeer . eiface hook ether
 C> ngctl mkpeer . eiface hook ether
 C> # give them some settings
 C> ifconfig ngeth0 ether 01:02:03:04:05:00
 C> ifconfig ngeth0 192.168.1.2/24
 C> ifconfig ngeth1 ether 01:02:03:04:05:01
 C> ifconfig ngeth1 192.168.3.2/24
 C> ifconfig bridge0 addm ngeth0 addm ngeth1 addm xl0
 C> ifconfig bridge0 up
 C> 
 C> # Count traffic using ipfw
 C> ipfw add 1 count ip from any to any in recv ngeth0
 C> ipfw add 1 count ip from any to any out xmit ngeth0
 C> ipfw add 2 count ip from any to any in recv ngeth1
 C> ipfw add 2 count ip from any to any out xmit ngeth1
 C> ipfw add 3 count ip from any to any in recv bridge0
 C> ipfw add 4 count ip from any to any out xmit bridge0
 C> 
 C> and wait a few seconds for kernel to panic.
 C> 
 C> Traffic flows via physical(xl0) when i shoot these commands.
 
 It looks like your ngeth interfaces aren't connected to any graph. Is that
 true?
 
 Is it essential that ng_ether node is loaded? You don't use it in your
 example.
 
 Actually, a bug in interoperation between ng_ether and if_bridge has been
 fixed in CURRENT. It is not yet merged to RELENG_6. However, your panic
 looks different. That's why I am asking about backtrace.
 
 -- 
 Totus tuus, Glebius.
 GLEBIUS-RIPN GLEB-RIPE