Re: Chrome engine based browsers (Iridium and Chromium) crashed while accessing NanoKVM USB (recognizes as USB camera + audio + uhid device emulation) device

Update

When camera access is allowed on the page, I can see the remote PC desktop, but when press "Select Serial Device" button Iridium/Chromium browsers crashed.

On Wednesday, October 29th, 2025 at 12:55 PM, Martin <martingot@protonmail.com> wrote:

> Hello
>
> First time some tests have been performed with OpenBSD 7.7 + Iridium and Chromium browsers with connected NanoKVM USB (USB camera + audio + uhid input device emulation) composite device.
>
> The same machine (OpenBSD 7.7 and 7.8 after upgrade) hosts nginx server with web page to access NanoKVM USB.
>
> By opening a link http://nanokvm.local in Iridium or Chromium browser on the same machine resolves and opens NanoKVM access page with drop down menu which asks to access camera and microphone device. Once permissions are granted "Select USB device" drop down menu has appeared with "USB3 Video" and "Select Serial Device" button to access NanoKVM USB video from remote PC where NanoKVM is connected.
>
> Once "Select Serial Device" button is pressed on the nanokvm.local web page, Iridium and Chromium browsers crash with core dump.
>
> I would like to solve this in some way, if it was possible.
>
> Some related system setting and commands are listed below:
>
> 1. sysctl kern.video.record=1
>
> 2. chmod 660 /dev/video* (NanoKVM USB uses video0)
> crw-rw---- 1 root wheel /dev/video -> video0
>
> crw-rw---- 1 root wheel /dev/video0
> crw-rw---- 1 root wheel /dev/video1
> crw-rw---- 1 root wheel /dev/video2
> crw-rw---- 1 root wheel /dev/video3
>
> 3. chmod 660 /dev/uhid* (NanoKVM USB uses uhid0)
> crw-rw---- 1 root wheel /dev/uhid0
> crw-rw---- 1 root wheel /dev/uhid1
> crw-rw---- 1 root wheel /dev/uhid2
> crw-rw---- 1 root wheel /dev/uhid3
> crw-rw---- 1 root wheel /dev/uhid4
> crw-rw---- 1 root wheel /dev/uhid5
> crw-rw---- 1 root wheel /dev/uhid6
> crw-rw---- 1 root wheel /dev/uhid7
>
> 4. chmod 660 /dev/audio* (NanoKVM USB uses audio1)
> crw-rw---- 1 root wheel /dev/audio0
> crw-rw---- 1 root wheel /dev/audio1
> crw-rw---- 1 root wheel /dev/audio2
> crw-rw---- 1 root wheel /dev/audio3
>
> 5. Run Iridium (Chromium) with command to get NanoKVM USB device accessible:
>
> iridium --user-data-dir="/tmp" --unsafely-treat-insecure-origin-as-secure=http://nanokvm.local
>
> 6. dmesg part with KVM USB composite device detected:
>
> uvideo0 at uhub0 port 6 configuration 1 interface 0 "MACROSILICON USB3 Video" rev 3.20/31.00 addr 4
> video0 at uvideo0
> uaudio0 at uhub0 port 6 configuration 1 interface 3 "MACROSILICON USB3 Video" rev 3.20/31.00 addr 4
> uaudio0: class v1, high-speed, sync, channels: 0 play, 2 rec, 1 ctls
> audio1 at uaudio0
> uhidev0 at uhub0 port 6 configuration 1 interface 4 "MACROSILICON USB3 Video" rev 3.20/31.00 addr 4
> uhidev: iclass 3/0
> uhid0 at uhidev0: input=0, output=0, feature=8
>
> Martin