[Click] Click-git: Kernel crash w/ Queue element overflow?

[Nuutti Varis]

Hey, 

While trying to run throughput measurements with Click in a kernel, running a simple EtherSwitch configuration (attached as etherswitch.click) in a topology of:

EndHostA::ethI0 <==> ethI0::EtherSwitch1::ethI1 <==> ethI1::EtherSwitch2::ethI0 <==> ethI0::EndHostB
192.168.2.1 ---------------------------------------------------------------------------> 192.168.2.2
FastUDPSrc w/ 64B packet, 300kpp/s

I stumbled upon a kernel crash, seemingly when the Queue elements started dropping packets due to overflow. I tried this with two different kernel versions (2.6.31.12 and 2.6.24.7) and with either 2.6.24.7 manual patch, or with --enable-fixincludes. Interestingly, the kernel crash does not happen when I disable SMP from the kernel. Additionally, normal linux bridging does not crash the kernel on overflows. Partial/full crash dumps as attachments from various days of testing.

Configuration stuff of the EtherSwitch{1,2}:
- Dumps arch indicated in the filename, either amd64 or ia32
- MTU of ethI1 is 1540 (tried with 1500 as well, no difference)
- Click is configured with --enable-linuxmodule --enable-userlevel --enable-etherswitch [--enable-fixincludes]
- Kernel does not have any pre-empting enabled.
- Both e1000e poll-patched and vanilla cause the problem
- e1000e versions 0.4.1.7 and 1.0.2-k2 (comes with 2.6.31.12) cause the problem


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--
Nuutti Varis (nvaris at cc.hut.fi)
PhD Student, Aalto University School of Science and Technology
Department of Communications and Networking