Comment 0 for bug 1748242

If pavucontrol "PulseAudio Volume Control" is open it causes 'sudo lsusb -v' to fail if there is a Dell AC511 soundbar attached via USB.

The error message:
 $ sudo lsusb -v

 ----[ snip ]----

 Bus 001 Device 002: ID 413c:a503 Dell Computer Corp.
 lsusb: gconv.c:74: __gconv: Assertion `outbuf != NULL && *outbuf != NULL' failed.
 Aborted

 $ sudo lsusb -v -d 413c:a503

 Bus 001 Device 002: ID 413c:a503 Dell Computer Corp.
 lsusb: gconv.c:74: __gconv: Assertion `outbuf != NULL && *outbuf != NULL' failed.
 Aborted

The bug goes away when "PulseAudio Volume Control" is closed.

Ubuntu 17.10
Linux 4.13.0-32-generic x86_64