Ever since I tried out the AI plugins (and later removed them again), my machine totally hangs during /admin/upgrade. Not every time but approximately 80% of the time. Usually my whole EC2 instance freezes and I have to do a hard reboot through the AWS EC2 web UI. Today it hangs again. To my surprise it doesn’t freeze completely. When opening the root URL it now shows: Oops The software powering this discussion forum encountered an unexpected problem. We apologize for the inconvenience. Detailed information about the error was logged, and an automatic notification generated. We’ll take a look at it. No further action is necessary. However, if the error condition persists, you can provide additional detail, including steps to reproduce the error, by posting a discussion topic in the site’s feedback category. I now will try to reboot it again and do the usual sudo ./launcher rebuild app stuff which fixed it until now. Fingers crossed it will do this today, again. My question Can anyone give me some hints on where I could take a look into log files or things like this to get at least an error message of why the hangs occur?

@Jagster @uwe_keim please could you report the output of these commands cat /proc/sys/vm/overcommit_memory cat /sys/kernel/mm/transparent_hugepage/enabled On my systems I have # cat /proc/sys/vm/overcommit_memory 1 # cat /sys/kernel/mm/transparent_hugepage/enabled always madvise [never]

$ cat /proc/sys/vm/overcommit_memory 0 and $ cat /sys/kernel/mm/transparent_hugepage/enabled always [madvise] never

Thanks @uwe_keim - I’m going to suppose that those kernel tunables are the reason you needed to add swap, even though it didn’t seem to be used. (The same would apply if you’d needed to add loads of RAM, because the total available memory is RAM+swap.)

I can change server settings any time if you recommend to do so.

root@foorumi-hel:/var/discourse# cat /proc/sys/vm/overcommit_memory 0 root@foorumi-hel:/var/discourse# cat /sys/kernel/mm/transparent_hugepage/enabled always [madvise] never

[image] Uwe Keim: change server settings any time if you recommend I do recommend! This will fix it for future reboots (note that it overwrites files without checking the current state): echo 'sys.kernel.mm.transparent_hugepage.enabled=never' > /etc/sysctl.d/10-huge-pages.conf echo 'vm.overcommit_memory=1' > /etc/sysctl.d/90-vm_overcommit_memory.conf sysctl --system

I’m trying but getting this: $ echo 'sys.kernel.mm.transparent_hugepage.enabled=never' > /etc/sysctl.d/10-huge-pages.conf -bash: /etc/sysctl.d/10-huge-pages.conf: Permission denied $ sudo echo 'sys.kernel.mm.transparent_hugepage.enabled=never' > /etc/sysctl.d/10-huge-pages.conf -bash: /etc/sysctl.d/10-huge-pages.conf: Permission denied My server is an Ubuntu Server 22.04.3 LTS.

Try running it in a root shell, it might be struggling with being in a normal shell. (You’re sudoing the echo, but not the pipe to the file)

Indeed, several ways to do it, here’s one sudo sh -c "echo 'sys.kernel.mm.transparent_hugepage.enabled=never' > /etc/sysctl.d/10-huge-pages.conf"

I’ve ran the scripts and rebooted. Then: $ cat /proc/sys/vm/overcommit_memory 1 and $ cat /sys/kernel/mm/transparent_hugepage/enabled always [madvise] never (So first thing changed from 0 to 1 but second thing still returns the same).

Whole machine hangs during upgrade

Product Support Self-hosting

Ed_S (Ed S) February 2, 2024, 2:20pm 25

Odd. What do you get from

cat /etc/sysctl.d/10-huge-pages.conf

Perhaps try the echo again?

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Whole machine hangs during upgrade

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