from the Linux-erotica dept.
The other day, Michael W Lucas, who is normally known for good technical literature, put up a wild experiment of a short story: Savaged by Systemd. It's erotica, sort of. It's computer erotica, to be specific. It's Linux sysadmin erotica, to be more specific. OK, fine, it's systemd erotica. Really. Anyway, despite the subject and the genre, and in spite of the combination of the two, the e-book is trending and rising in quite a few lists.
Hopefully he can still remain focused on Absolute FreeBSD and be able to get that finished by the next BSDCan.
[Ed note: Has anybody actually bought and read this short story? I wasn't going to spend $2.99 to see what the hubub was about. - cmn32480]
System adminsitrator Chris Siebenmann has found Modern versions of systemd can cause an unmount storm during shutdowns:
One of my discoveries about Ubuntu 20.04 is that my test machine can trigger the kernel's out of memory killing during shutdown. My test virtual machine has 4 GB of RAM and 1 GB of swap, but it also has 347 NFS[*] mounts, and after some investigation, what appears to be happening is that in the 20.04 version of systemd (systemd 245 plus whatever changes Ubuntu has made), systemd now seems to try to run umount for all of those filesystems all at once (which also starts a umount.nfs process for each one). On 20.04, this is apparently enough to OOM[**] my test machine.
[...] Unfortunately, so far I haven't found a way to control this in systemd. There appears to be no way to set limits on how many unmounts systemd will try to do at once (or in general how many units it will try to stop at once, even if that requires running programs). Nor can we readily modify the mount units, because all of our NFS mounts are done through shell scripts by directly calling
mount; they don't exist in
/etc/fstabor as actual
We've been here before and there is certainly more where that came from.
(2020) Linux Home Directory Management is About to Undergo Major Change
(2019) System Down: A systemd-journald Exploit
(2017) Savaged by Systemd
(2017) Linux systemd Gives Root Privileges to Invalid Usernames
(2016) Systemd Crashing Bug
(2015) tmux Coders Asked to Add Special Code for systemd
(2016) SystemD Mounts EFI pseudo-fs RW, Facilitates Permanently Bricking Laptops, Closes Bug Invalid
(2015) A Technical Critique of Systemd
(2014) Devuan Developers Can Be Reached Via email@example.com
(2014) Systemd-resolved Subject to Cache Poisoning