Hi, We're running commands below on kernel 4.15.0: 1) ip netns add at_ns0 2) ip link add p0 type veth peer name ovs-p0 3) ip link set p0 netns at_ns0 4) ip link set dev ovs-p0 up
However, it always hangs at creating veth peer, command (2) when we run above commands in GNU autotest. Running the same commands in a bash script works fine. Running bisect on iproute2, the first bad commit is commit 72a2ff3916e59d2132a7d613d9e8f5eb372ba43e Author: Chris Mi <chr...@mellanox.com> Date: Fri Jan 12 14:13:15 2018 +0900 lib/libnetlink: Add a new function rtnl_talk_iov rtnl_talk can only send a single message to kernel. Add a new function rtnl_talk_iov that can send multiple messages to kernel. rtnl_talk_iov takes struct iovec * and iovlen as arguments. GDB shows it hangs on #0 0x00007f9c92e6b330 in recvmsg () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x000000000044eac6 in __rtnl_recvmsg () #2 0x000000000044eb95 in rtnl_recvmsg () #3 0x000000000044ed46 in __rtnl_talk_iov () #4 0x000000000044fbb8 in rtnl_talk () #5 0x0000000000422554 in iplink_modify () Any suggestion about how to debug this? Thanks William
