Public bug reported:
Summary:
lshw -C network hangs indefinitely on Ubuntu 24.04.2 with virtual interfaces
such as tailscale0, docker0, vmnet*, and lxcbr0
❯ lsb_release -rd
No LSB modules are available.
Description: Ubuntu 24.04.2 LTS
Release: 24.04
❯ apt-cache policy lshw
lshw:
Installed: 02.19.git.2021.06.19.996aaad9c7-2build3
Candidate: 02.19.git.2021.06.19.996aaad9c7-2build3
Version table:
*** 02.19.git.2021.06.19.996aaad9c7-2build3 500
500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages
500 http://ubuntu.mirror.serversaustralia.com.au/ubuntu noble/main
amd64 Packages
100 /var/lib/dpkg/status
Description:
On Ubuntu 24.04.2 with kernel 6.8.0-56-generic, the lshw command hangs when
scanning network interfaces. This occurs even when filtering for known-good PCI
devices.
Running sudo lshw -C network produces no output and does not complete.
Adding timeouts (e.g. timeout 10s sudo lshw -C network) confirms it does
not return.
The installed version is:
lshw: 02.19.git.2021.06.19.996aaad9c7-2build3
The package passes verification (sudo dpkg -V lshw) and has no missing
files.
lspci and /sys/class/net show that there are two valid PCI interfaces
(eno1 and ens1). However, lshw appears to probe all interfaces under
/sys/class/net/* before filtering, and hangs or exits silently when
encountering virtual interfaces that lack a device/uevent, such as:
docker0 (Docker bridge)
tailscale0 (Tailscale)
lxcbr0 (LXC bridge)
vmnet1, vmnet2, vmnet8 (VMware Workstation)
br-* (custom Docker bridge)
Manual probing of /sys/class/net/*/device/uevent confirms that these
interfaces do not have hardware backing, which causes lshw to fail
silently or stall.
This behavior breaks system administration scripts and diagnostics.
Previous versions of lshw (and tools like lspci, ethtool, etc.) handled
these interfaces gracefully.
Expected behavior:
lshw should gracefully skip virtual interfaces without a device/uevent, or
timeout quickly rather than hanging indefinitely.
How to reproduce:
Use Ubuntu 24.04.2 with kernel 6.8.0-56-generic
Install Docker, Tailscale, VMware Workstation or any software that
creates virtual interfaces
Run: sudo lshw -C network
Observe that the command hangs or exits with no output
Workaround:
Avoid using lshw on systems with active virtual interfaces. Use lspci, ethtool,
and udevadm instead to inspect network hardware.
Some help by ChatGPT in producing this
** Affects: lshw (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2105467
Title:
lshw -C network hangs indefinitely on Ubuntu 24.04.2 with virtual
interfaces (tailscale0, docker0, vmnet, etc.)
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