Public bug reported:
1) The release of Ubuntu you are using, via 'lsb_release -rd' or System ->
About Ubuntu
❯ lsb_release -rd
Description: Ubuntu 21.04
Release: 21.04
2) The version of the package you are using, via 'apt-cache policy pkgname' or
by checking in Software Center
❯ LANG=C apt-cache policy linux-raspi
linux-raspi:
Installed: 5.11.0.1009.7
Candidate: 5.11.0.1009.7
Version table:
*** 5.11.0.1009.7 500
500 http://ports.ubuntu.com/ubuntu-ports hirsute-updates/main arm64
Packages
500 http://ports.ubuntu.com/ubuntu-ports hirsute-security/main arm64
Packages
100 /var/lib/dpkg/status
5.11.0.1007.5 500
500 http://ports.ubuntu.com/ubuntu-ports hirsute/main arm64 Packages
3) What you expected to happen
Processes launched during the NIC load is high will exit normally.
4) What happened instead
I'm using hirsute on Raspberry Pi 4 model B(4GB RAM).
Some processes launched during the NIC load is high might not exit.
What "NIC load is high" means:
- I have configured crontab to run Ookla's speedtest-cli which generates heavy
network traffic every 15 minites.
- During speedtest-cli, Softirq becomes higher.
- SoC(BCM2711) built-in NIC(driver is bcmgenet)
What "may not exit" means:
- Some processes launched during speedtest-cli is running will not exit. It
remains with consuming CPU 100% and not accept any signals including SIGKILL.
- Those processes can't be attached by gdb or strace. Trying to do so, gdb and
strace will freeze.
I could't terminate the processes in any way. But the system could be
rebooted by "sudo reboot" command.
I configured RFS/RPS to distribute Softirq among CPU cores. It was quite
effective, but did not prevent the problem completely.
** Affects: linux-raspi (Ubuntu)
Importance: Undecided
Status: New
** Tags: arm64 hirsute
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https://bugs.launchpad.net/bugs/1932586
Title:
Processes launched during the NIC load is high may hang up.
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