Re: Freeze with BPF BIOCSFEEDBACK

[christos%astron.com@localhost (Christos Zoulas)]

In article <20151216223612.GA1594%falu.nl@localhost>, Rhialto  <rhialto%falu.nl@localhost> wrote:
>-=-=-=-=-=-
>
>I just had a freeze which likely was caused by BPF. This was with a
>distributed GERNERIC version of 7.0/amd64.
>
>I was running a PDP-10 emulator, klh10, https://github.com/Rhialto/klh10
>which I configured to use BPF to communicate with the outside world.
>I ran my tops-20 installation, and as soon as the network got active,
>my real machine froze. Since I was in X, I could see nothing change any
>more.
>
>I tried it on my laptop also with 7.0 installed. Not even the caps-lock
>led was active. After a while it unfroze for a bit, then refroze.
>There were no green kernel messages.
>
>I am working on it so the actual code I ran was not exactly like in the
>repository. The important difference seems to be this below:
>
>#if defined(BIOCSFEEDBACK)
>    i = 1;
>    if (ioctl(fd, BIOCSFEEDBACK, (char *) &i) < 0)
>	esfatal(1, "BIOCSFEEDBACK failed");
>#endif
>
>where fd is a BPF descriptor.
>
>which I had added. When I commented it out, and tried again, tops-20
>worked fine. However, you can't communicate with it from the host. The
>BIOCSFEEDBACK was supposed to make that work.
>
>Any ideas? Seems like a bug...

Update to bpf.c to head, I just committed a fix.

christos