Systemd-udevd 100% cpu for 6 days, ubuntu studio jammy

Did you check the log for the service using journalctl ?

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Same problem on Intel i9
Ubuntu studio Jammy livecd
Kernel 5.15.0-54-lowlatency
Journalctl -g udev shows nothing

Journal: 26 entries 4 days ago at boot
Unshare failed
Snapd[1473]: Udevmon.go:149: udev event error...no buffer space available
Nothing for next 4 days,
100% CPU load for 4 days

Hotplug mouse: recognized, shows in dmesg,
No response of cursor
Hotplug drive is ok.

Do you have the possibility to verify whether this happens only on a system running in livecd mode, or also after installation on a hard disk?

Do you use the ubuntu studio 22.04 installer iso file or the updated 22.04.1 iso?

I9: studio daily livecd from November.
No systemd-udev cpu load until closing lid of laptop
Now 100%. Screen blanked, NOT sleeping, fan racing, slow to resume.
Sleep on menu did sleep it.

Can't install until I have a 2nd drive

Parted error
Possibly related?
Rm took a very long time!
Mkpart gave this warning after several minutes:
Failed to wait for daemon to reply: Connection timed out

A few minutes later repeated the message

Parted: set flag:
Same warnings,
5 minutes to finish
Nothing in dmesg

Pvcreate & vgcreate work after 5 min delay
Lvcreate hangs forever

Above fail was to be a
New LVM on the 12thgen i9's NVME drive.
(Works on my ryzen)

AMD FX, K5.15.0-54 Generic,
Ubuntu budgie jammy
Lvs hangs

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After another sleep/wake
Ryzen 4600G also has this problem
k5.15.0-48-lowlatency
Systemd 249.11-0ubuntu3.6

Also usb ethernet did not get an IP
(was online before suspend)

Tried:
Systemctl stop Systemd-udevd
Restarted immediately, still 100% CPU.

i9 pegs all cores to 100% frequency:
I turned turbo off, found the pid, ran
sudo taskset -p 0x008000 $udevdpid
cd /sys/devices/system/cpu/cpu19/cpufreq
echo 400000|sudo tee scaling_max_freq

Lvm fail workaround:
(I found this online,
No idea if it is safe,
Seems ok so far)
sudo pkill -SIGCONT lvcreate

Workaround 2:
(No idea if this is safe, worked for me AFAIKT)
sudo dmsetup udevcomplete_all
(Sometimes needed 2x or more)

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Partprobe also freezes
Cryptsetup freezes, partition is open but no entry in /dev/mapper

Plug in usb ethernet, no message in dmesg for 2 days, no IP from DHCP

Same udev issue, linux 5.13.0-52 generic focal, live boot usb3, 2nd usb3 drive

A10 : kubuntu lunar, kernel 6.1,
Systemd-Udevd 100% CPU after sleep, livecd
Udev 252.4-1ubuntu1

Udev 245.4-4ubuntu3.17 also fails after sleep

i9: udevd still fails
5.19.0-1018 lowlatency
Studio livecd 230303

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Ubuntu cunnamon lunar
Kernel 6.2
i9 12900
udevd still fails after
Sleeping a livecd boot.

Another Lvm workaround:
DM_DISABLE_UDEV=1 lvcreate ...

Ryzen: workaround:
systemctl status systemd-udevd*
# should list 3 units
systemctl stop systemd-udevd*
# cpu load normal
systemctl start systemd-udevd-control.socket systemd-udevd-kernel.socket
# hotplug now works. YMMV.

After hotplug,
systemctl status systemd-udevd*
Gave errors for new device sda...unshare ... snap ...
But device is working

Ryzen will no longer sleep after udevd restart

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FYI: same result on peppermintOS, kernel 5.10.149, udev 3.2.9
Sleep livecd wakes w. Udev 100% cpu
So not strictly a ubuntu issue,
Or just a systemd issue (no systemd)
Or a deep sleep issue (15W asleep)
workaround:
sudo ./eudev restart

Besides sleeping,
On ryzen (jammy)
Adding a partition to a usb drive
Triggers udevd to 100% cpu

Did Cinnamon lunar 'poor man' install
(Copied livecd iso to a small partition )
Sd card booted to internal nvme
Removed sd card reader
Sleep wake now ok, no udevd issue
(with no sd card reader)
Looks like a USB issue

This question was expired because it remained in the 'Open' state without activity for the last 15 days.