tc qdisc show hangs

[shemminger]

I am glad to see lots of iproute2 commands working but tc command hangs.
Simple example:
$ tc qdisc show

The cause is netlink request to dump qdisc never gets response.

(gdb) where
#0 0x00007ffffec0ec00 in __recvmsg_nocancel () at ../sysdeps/unix/syscall-template.S:81
#1 0x00000000004343c4 in rtnl_dump_filter_l (rth=0x65fe40 , arg=arg@entry=0x7ffffffde290) at libnetlink.c:328
#2 0x00000000004347c3 in rtnl_dump_filter_nc (rth=, filter=filter@entry=0x408200 <print_qdisc>, arg1=, nc_flags=nc_flags@entry=0) at libnetlink.c:416
#3 0x0000000000408e24 in tc_qdisc_list (argc=0, argv=0x7ffffffde450) at tc_qdisc.c:333
#4 0x0000000000407590 in main (argc=3, argv=0x7ffffffde438) at tc.c:343

Suggest that if netlink family for qdisc is not supported, either return error when family is opened, or return error on the netlink request.

[GitTorre]

What tc capabilities are supported in the BoW environment? This is basically what I see when playing around with tc in BoW -> Cannot talk to rtnetlink: Operation not supported.

[shemminger]

On my corp laptop with Win10 creators shemminger@MININT-FU8L5V5:~$ tc qdisc *** hangs need ^C to exit Also the version in Ubuntu WSL is old (like 3yrs since version is data stamp). shemminger@MININT-FU8L5V5:~$ tc -V tc utility, iproute2-ss131122 Current upstream version shemminger@MININT-FU8L5V5:~$ cd iproute2/ shemminger@MININT-FU8L5V5:~/iproute2$ ./tc/tc -V tc utility, iproute2-ss170220 I think the issue is the Ubuntu gets packages from Debian stable which is quite old by now. From: Charles Torre [mailto:[email protected]] Sent: Friday, May 5, 2017 1:10 PM To: Microsoft/BashOnWindows <[email protected]> Cc: Stephen Hemminger <[email protected]>; Author <[email protected]> Subject: Re: [Microsoft/BashOnWindows] tc qdisc show hangs (#2026) What tc capabilities are supported in the BoW environment? This is basically what I see when playing around tc in BoW -> Cannot talk to rtnetlink: Operation not supported. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#2026 (comment)> , or mute the thread <https://github.com/notifications/unsubscribe-auth/ABAYOcIRudvgAjXileQdMNnO4mohNQjgks5r24IcgaJpZM4NKeiX> . <https://github.com/notifications/beacon/ABAYOXEPiEW93T5RqhqWzaBs6W_1MDGtks5r24IcgaJpZM4NKeiX.gif>

[GitTorre]

Yep, tc qdisc hangs for me, as well. Same Win10 OS version. In fact, nothing about tc works...

[jonatino]

Also, have this issue.

• Your Windows build number: Microsoft Windows [Version 10.0.16299.334]

• What you're doing and what's happening:
  Run the following command tc qdisc show

• What's wrong / what should be happening instead:
  The command hangs and never executed.

tc.strace gist here

Currently causing an issue with flent on Windows Linux Subsystems: tohojo/flent#130

[Brian-Perkins]

There is still no support for qdisc, but the hang should be fixed in build 17666.