Re: kernel panic. pppoe

On Monday 29 May 2006 11:05, sekes wrote:
> Cause my message has been lost in threads i repost it again here.
>
> http://lists.freebsd.org/pipermail/freebsd-current/2006-May/062955.html
> Sorry for annoying :-)
>
> Strange panic occurs in the kernel every time i'm trying to make PPPoE
> connection
> This problem is very important to me because since all that time it
> presents in the kernel i am not able to establish any succesfull internet
> sessions longer than on 10-15 minutes:(
>
> panic: mutex Giant not owned at /usr/src/sys/net/if.c:2209
> cpuid = 0
> KDB: enter: panic
> [thread pid 11 tid 100005 ]
> Stopped at      kdb_enter+0x2b: nop
> db>
> db>
> db>
> db> bt
> Tracing pid 11 tid 100005 td 0xc28916c0
> kdb_enter(3230725374) at kdb_enter+43
> panic(3230722033,3230813051,3230769714,2209,3264851968) at panic+295
> _mtx_assert(3231693000,1,3230769714,2209) at _mtx_assert+102
> if_start(3264851968) at if_start+38
> ether_output_frame(3264851968,3265936896,3265938176,0,3270958224) at
> ether_output_frame+384
> ng_ether_rcvdata(3270304512,3270958224,1717,3231718100,0) at
> ng_ether_rcvdata+308
> ng_apply_item(0,3265938176,5,0,0) at ng_apply_item+278
> ng_snd_item(3270958224,0,3270958224,3266710848,3270315648) at
> ng_snd_item+230
> pppoe_ticker(3270315648,3270304384,0,0,3227049343) at pppoe_ticker+229
> ng_apply_item(1,622,2,1,0) at ng_apply_item+495
> ng_snd_item(3270958272,0,3548757204,3228176966,3270958272) at
> ng_snd_item+230
> ng_callout_trampoline(3270958272) at ng_callout_trampoline+13
> softclock(0) at softclock+518
> ithread_execute_handlers(3263761156,3263960576) at
> ithread_execute_handlers+234
> ithread_loop(3263596944,3548757304) at ithread_loop+103
> fork_exit(3228039632,3263596944,3548757304) at fork_exit+164
> fork_trampoline() at fork_trampoline+8
> --- trap 1, eip = 0, esp = 3548757356, ebp = 0 ---

Looks like you have a NIC that still requires the Giant lock around the 
network stack and you found a callpath that does not pick it up.  As a 
workaround you can try to disable the mpsafe networking (debug.mpsafenet=0), 
be sure to tell us if that helps and examine "ifp" in the if_start frame if 
possible.

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