On 10/15/2015 04:20 PM, Dmitry Vyukov wrote: > Hello, > > I am trying to run a program in lkvm sandbox so that it communicates > with a program on host. I run lkvm as: > > ./lkvm sandbox --disk sandbox-test --mem=2048 --cpus=4 --kernel > /arch/x86/boot/bzImage --network mode=user -- /my_prog > > /my_prog then connects to a program on host over a tcp socket. > I see that host receives some data, sends some data back, but then > my_prog hangs on network read. > > To localize this I wrote 2 programs (attached). ping is run on host > and pong is run from lkvm sandbox. They successfully establish tcp > connection, but after some iterations both hang on read. > > Networking code in Go runtime is there for more than 3 years, widely > used in production and does not have any known bugs. However, it uses > epoll edge-triggered readiness notifications that known to be tricky. > Is it possible that lkvm contains some networking bug? Can it be > related to the data races in lkvm I reported earlier today? > > I am on commit 3695adeb227813d96d9c41850703fb53a23845eb. Hey Dmitry, How long does it take to reproduce? I've been running ping/pong as you've described and it looks like it doesn't get stuck (read/writes keep going on both sides). Can you share your guest kernel config maybe? Thanks, Sasha -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
