Crash with GRE und IPFW fwd

[hiren panchasara]

On 05/28/15 at 01:42P, Julian Kornberger wrote:
> Hi,
> 
> I have recurring crashes if I forward GRE packets using IPFW with fwd:
> - The first fwd rule forwards incoming traffic into a GRE interface.
> - The second fwd rule forwards GRE packets to a gateway.
> 
> If there is no GRE traffic, the system is stable. As soon as there is 
> GRE traffic i takes araound one to five minutes until is crashes.
> If I omit the second fwd rule, it never crashes.
> 
> I use a FreeBSD 10.1 on a PC Engines APU.1D board.
> Any Ideas how to debug this?
> 
> Kind Regards
> Julian
> 
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0x7c
> fault code              = supervisor read data, page not present
> instruction pointer     = 0x20:0xffffffff80a58105
> stack pointer           = 0x28:0xfffffe00957335e0
> frame pointer           = 0x28:0xfffffe00957336e0
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                          = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 1707 (tcpmssd)

Where is this from? net/tcpmssd port/package? 

If so, try disabling/uninstalling it and see if that helps.

cheers,
Hiren
> trap number             = 12
> panic: page fault
> cpuid = 0
> KDB: stack backtrace:
> #0 0xffffffff80963000 at kdb_backtrace+0x60
> #1 0xffffffff80928125 at panic+0x155
> #2 0xffffffff80d258df at trap_fatal+0x38f
> #3 0xffffffff80d25bf8 at trap_pfault+0x308
> #4 0xffffffff80d2525a at trap+0x47a
> #5 0xffffffff80d0b142 at calltrap+0x8
> #6 0xffffffff81a15797 at gre_output+0x467
> #7 0xffffffff80a59024 at ip_output+0x11b4
> #8 0xffffffff819b257a at div_send+0x33a
> #9 0xffffffff8099e0b5 at sosend_generic+0x475
> #10 0xffffffff809a4425 at kern_sendit+0x245
> #11 0xffffffff809a4749 at sendit+0x129
> #12 0xffffffff809a460d at sys_sendto+0x4d
> #13 0xffffffff80d26211 at amd64_syscall+0x351
> #14 0xffffffff80d0b42b at Xfast_syscall+0xfb
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