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Atari

Member

Registered: 2016-04-20

Posts: 38

[SOLVED] VPS freezes after disk update

Hello,
I've recently changed the plan in my VPS, which increased the capacity of the disk. Then I've increased the partition with parted and resize2fs.
Now I find an odd problem where the VPS becomes unresponsive after a bit. In the monitoring section of the VPS provider it shows that, starting from a certain point, the processor usage became 100% and stays so undefinetely. Furthermore, I suspect it's the same point where journalctl stops reporting any log (https://www.heypasteit.com/clip/0IT8OO).
Yesterday I was able to log in by ssh (today also SSH was unresponsive) and noticed that both journalctl and a process named jbd2 were cumulatively using the whole cpu. Searching on the internet, this seems to be caused by some process emitting too many log entries, but I wasn't able to perform the tracing as reported on https://serverfault.com/questions/47686 … g-99-99-io , because the VPS was too unresponsive, I could not even access the log from journalctl.
Moreover, after a reboot, I was not still able to log in by ssh, while the rest of the services (mail server, web server) seemed to be okay, and I had to fall back to rescue mode.

Any suggestions on how to investigate/solve this issue?

Last edited by Atari (2019-10-01 11:04:47)

Atari

Member

Registered: 2016-04-20

Posts: 38

Re: [SOLVED] VPS freezes after disk update

I've managed to log in again in the VPS after a reboot and before becoming totally unmanageable. Again jbd2/vda1-8 and kworker/u2:0+flush-254:0 this time are using the whole cpu, but iotop shows no activity whatsever. I can create files (with touch), but apparently I cannot write any content, that is also vim became stuck when i pressed :wq.

Atari

Member

Registered: 2016-04-20

Posts: 38

Re: [SOLVED] VPS freezes after disk update

Output of dumpe2fs: https://pastebin.com/maEnhPeu

Atari

Member

Registered: 2016-04-20

Posts: 38

Re: [SOLVED] VPS freezes after disk update

running fatrace and iotop shows normal activity from sshd & exim. Perhaps it's the performance of the disk that dramatically deteriorates over time (few hours) ?

dmesg log: http://ix.io/1WK9

Last edited by Atari (2019-09-24 17:21:48)

Atari

Member

Registered: 2016-04-20

Posts: 38

Re: [SOLVED] VPS freezes after disk update

Hi there,
it turns out that there was nothing wrong with my configuration. The problem did not reappear (for whatever reason) after the VPS has been migrated to a different host by the host provider.