Hi Murphy, I got a insufficient buffer headroom error; like the following:
ofdatapath: lib/ofpbuf.c:168: ofpbuf_prealloc_headroom: Assertion `size <= ofpbuf_headroom(b)' failed. Nov 08 04:52:18|00004|fault|EMER|Caught signal 6. 0x08057b5f 0xb8075400 (__kernel_sigreturn+0x0) 0xb7f2c098 (abort+0x188) 0xb7f235ce (__assert_fail+0xee) 0x0805ac79 0x0805ac9e (ofpbuf_push_uninit+0x1e) 0x08051303 (dp_output_control+0x53) 0x08053aed (execute_actions+0x1ed) 0x080522e1 0x080534ac (dp_run+0x3bc) 0x0805474d (udatapath_cmd+0x54d) 0x08054802 (main+0x22) 0xb7f15775 (__libc_start_main+0xe5) Nov 08 04:52:18|00010|netdev|ERR|ioctl(SIOCGIFFLAGS) on tap0 device failed: No such device Nov 08 04:52:18|00011|port_watcher|WARN|could not get flags for tap0 Nov 08 04:52:18|00012|rconn|WARN|unix:/var/run/dp0: connection dropped (Connection reset by peer) It happens only on the second switch on the path, while the other one keeps connected to the controller. 2011/11/8 Murphy McCauley <jam...@nau.edu> > How do the switches crash? With an assertion about insufficient buffer > headroom or something? Or about a bad buffer ID (are you applying multiple > actions?)? Or do they just segfault? > > Feel free to send along a capture of the OpenFlow traffic between NOX and > the switch (along with the NOX and switch logs if possible), and we can > take a look. Though I'd be surprised if it was NOX sending something > invalid that was causing your problem. > > If you can develop a very simple application that crashes the switches, > that would be valuable, and you might try sending it to one of the OpenFlow > mailing lists too. > > Any which way, the simplest answer is probably to use Open vSwitch instead > of the OpenFlow reference implementation. > > -- Murphy > > On Nov 8, 2011, at 1:31 AM, andrea simeoni wrote: > > > Hi guys, > > > > I'm running a test with 2 hosts, 2 OF switches and 1 controller. The > switches and hosts are on 4 different ubuntu virtual machines and the > controller is on the host machine. For switches I use the user space OF > implementation. > > I modified the simplerouting code to install a OFPP_CONTROLLER action in > both switches when a flow needs to be routed. To install actions I use the > simple API provided by routeinstaller. It happens that both switches crash > and close connection to controller. > > I tried the SAME controller on mininet (also with the same network > topology) and things seem be working. > > Any suggestions? > > -- > > Andrea Simeoni > > _______________________________________________ > > nox-dev mailing list > > nox-dev@noxrepo.org > > http://noxrepo.org/mailman/listinfo/nox-dev > > -- Andrea Simeoni
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