[Xorp-hackers] xorp_fea crashes when interface is removed from OS at in-opportune time.

Ben Greear greearb at candelatech.com
Fri Oct 19 22:29:36 PDT 2007

Pavlin Radoslavov wrote:
>> However, you can imagine that at any time an interface may leave, and if it
>> leaves before Xorp notices, then you can get those crashes.  I'm all for 
>> having
>> errors in the logs, but allowing an external event to crash the router seems
>> like a bad idea.
> Absolutely agree, an external event should not crash the router.
> Again, the assert is there to tell the developer there is an unusual
> problem that needs to be investigated.
It seems to take a while to propagate information through xorp, so it is 
for the code to not yet have discovered the interface is gone, and yet 
try the system
call to get the interface name/index.

There is absolutely no way you can be *certain* an interface is in the 
linux kernel when you
make that call, so you *have* to be able to handle failure cases if you 
want your app to
be robust.

> If the tool can be used to easily reproduce the problem, then yes
> please send me a copy of it with simple instructions how to use it
> to trigger the problem.
I'm not sure it will reproduce this particular issue, but it should help 
you with other
testing, especially with virtual routers and such.  I'll send you 
information off-list
on how to get it set up.


> Thanks,
> Pavlin

Ben Greear <greearb at candelatech.com> 
Candela Technologies Inc  http://www.candelatech.com

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