Panic: double panic and "IPv4 address: "a.b.c.d" is not on the network" flood in current

[Julian Elischer]

Bartosz Stec wrote:
> I've just been forced to rollback from 9-CURRENT kernel to 8-BETA2 
> kernel due to panics like this:
> 
>    Fatal double fault:
>    eip = 0x808ddcec
>    esp = 0xc7977fc0
>    ebp = 0xc7978038



yeah we found this yesterday if a fix is forthcoming.

> 
> Dump header from device /dev/ad0s1b
> 
>      Architecture: i386
>      Architecture Version: 2
>      Dump Length: 446615552B (425 MB)
>      Blocksize: 512
>      Dumptime: Wed Aug 26 12:13:22 2009
>      Hostname: serwer.obsysa.net
>      Magic: FreeBSD Kernel Dump
>      Version String: FreeBSD 9.0-CURRENT #0: Mon Aug 24 10:45:04 CEST 2009
>        ncpnc at serwer.obsysa.net:/usr/obj/usr/src/sys/ATHLON9
>      Panic String: double fault
>      Dump Parity: 4040556634
>      Bounds: 11
>      Dump Status: good
> 
> Panic seems to be ZFS (or general FS)  related, as it happens with heavy 
> IO, like during scrub or csup.
> My kernel was built without debugging options so here's what I could 
> provide:
> 
>    dmesg.boot (from 8-BETA2):
>    http://obsysa.net/bsd/dmesg.boot
> 
>    kernel config:
>    http://obsysa.net/bsd/ATHLON9
> 
>    vmcore (111MB!):
>    http://obsysa.net/bsd/vmcore.11.bz2
> 
> I also noticed dmesg flood with messages like this:
> 
>    IPv4 address: "78.8.144.1" is not on the network
> 
> I have tun device which is used to connect to ADSL line via PPPoE:
> 
>    tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1492
>            inet 78.8.144.74 --> 78.8.144.1 netmask 0xffffffff
>            Opened by PID 443
> 
> So I guess it's PPP issue, and seems to be harmless for now...
>