danyangz/slim

Slim: OS Kernel Support for a Low-Overhead Container Overlay Network

slim's Issues

Doubts about sockets in file router.cpp

Dear Dr. Zhuo. Sorry to bother you. I have a question in the source code. I try my best but I still can't understand that. So I ask you for help. I'll be very grateful if you explain my doubts.

My question is: on line 268 of the file router.cpp, it calls socket () to create a new socket; but, on line 544 of the file router.cpp, it calls close () to close the socket just created. Why it creates a new socket (i.e. line 268 of router.cpp),and then close the socket (i.e. line 544 of router.cpp) immediately.

Thanks in advance.

Nginx:worker process 1762 exited on signal 11 (core dumped)

Hi,

I am facing an error when trying to run Slim on nginx.

In host B, I run the command as follows:

root@ubuntu-16:/var/log/nginx# LD_PRELOAD=/slim/socket/SlimSocket.so VNET_PREFIX=10.32.0.0/12 /usr/sbin/nginx

In host A, I run the command:

root@ubuntu-16:/slim# LD_PRELOAD=/slim/socket/SlimSocket.so VNET_PREFIX=10.32.0.0/12 curl -i -X GET http://10.44.0.0/:80
connect() write 8 bytes to router.
curl: (52) Empty reply from server
root@ubuntu-16:/slim# 

and the error.log of nginx is:

root@ubuntu-16:/var/log/nginx# cat error.log 
2020/12/06 13:17:09 [alert] 1705#1705: worker process 1710 exited on signal 11 (core dumped)
root@ubuntu-16:/var/log/nginx#

note: I run the nginx and wget in ubuntu container.

Would be glad to hear some ideas on how to resolve the issue.

Thanks.

Segmentation fault

Hi,

I am facing a segmentation fault error when trying to run Slim on Centos 7.5 with Docker 19.03.6.

Below is some output from my debug effort with gdb:

$ docker run --cap-add=SYS_PTRACE --name c1 -v /tmp/slim/:/slim -it pingpong:v1
[root@c1 socket]# gdb --args env LD_PRELOAD=/slim/socket/SlimSocket.so iperf3 -s
(gdb) run
Starting program: /usr/bin/env LD_PRELOAD=/slim/socket/SlimSocket.so iperf3 -s
warning: Error disabling address space randomization: Operation not permitted
process 115 is executing new program: /usr/bin/iperf3
WARNING: VNET_PREFIX is not set. Using 0.0.0.0/0.
All connections are treated as virtual network connections.
[TRACE] New client with sock 4.
[TRACE] result of pthread_create --> 0
[TRACE] Start to handle the request from client sock 4.
[TRACE] Start to read from sock 4
[TRACE] Get request cmd 0
[DEBUG] SOCKET_SOCKET
[TRACE] write rsp 4 bytes to sock 4

Program received signal SIGSEGV, Segmentation fault.
fd_store (type=fd_fsocket, host_fd=10, overlay_fd=-1, app_fd=-1) at socket.c:116
116 fdi->host_fd = host_fd;
(gdb) bt
#0 fd_store (type=fd_fsocket, host_fd=10, overlay_fd=-1, app_fd=-1) at socket.c:116
#1 socket (domain=, type=type@entry=1, protocol=protocol@entry=0) at socket.c:507
#2 0x00007ffff78cb640 in netannounce (domain=0, proto=proto@entry=1, local=0x0, port=) at net.c:158
#3 0x00007ffff78c7b5e in iperf_server_listen (test=test@entry=0x603010) at iperf_server_api.c:75
#4 0x00007ffff78c8372 in iperf_run_server (test=test@entry=0x603010) at iperf_server_api.c:469
#5 0x0000000000400f3b in run (test=test@entry=0x603010) at main.c:152
#6 0x0000000000400d29 in main (argc=2, argv=0x7fffffffe778) at main.c:111

Would be glad to hear some ideas on how to resolve the issue.

Thanks,
Vladimir