Sendmsg failing with EINVAL when trying to run Servo

[samlh]

I tried compiling and running the Servo web browser in WSL (using Xvfb), and ran into an issue related to the IPC implementation:

[pid 24291] socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, [9, 11]) = 0

[pid 24313] sendmsg(9, {msg_name(0)=NULL, msg_iov(2)=[{"c\0\0\0\0\0\0\0", 8}, {"\0\0\0\0\0\0\0\0\0\0\0\21http://servo.org/\0\0\0"..., 99}], msg_controllen=24, {cmsg_len=24, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {53, 54}}, msg_flags=0}, 0 <unfinished ...>
[pid 24313] <... sendmsg resumed> )     = -1 EINVAL (Invalid argument)

Interesting sendmsg features used are:

• Socket type SOCK_SEQPACKET
• msg_iovlen == 2
• SCM_RIGHTS to send file descriptors

Source code is available as MIT/Apache if you want to take a look.

May be related to #376

[misenesi]

Hi @samlh,

We currently only have a support for passing just one file descriptor at a time via unix sockets. Marking it as a bug and will look into fixing this.

Thank you for reporting this.

[sunilmut]

Just an update that the fix for this has been checked in the dev branch and should soon hit the release branch. Please keep the feedback coming. We are looking at them.

[sunilmut]

Just FYI that this should be fixed in 15042. If the issue persists, please let us know. Thanks again for the post.