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#1 2020-12-06 21:29:16

Utini
Member
Registered: 2015-09-28
Posts: 481
Website

systemd-resolved at 100% CPU usage, crashing firefox and skype

Hello everyone,

today I noticed that when connecting to my phones wifi hotspot, systemd-resolved will take up too 100% CPU usage.
Additionally firefox and skype crash.
Furthermore I can't resolve any domains.

This is the status of systemd-resolved.service:

Dez 06 21:59:15 S2000 systemd-resolved[644]: Using degraded feature set TCP instead of UDP for DNS server 192.168.208.87.
Dez 06 21:59:35 S2000 systemd-resolved[644]: Using degraded feature set UDP instead of TCP for DNS server 192.168.208.87.
Dez 06 21:59:40 S2000 systemd-resolved[644]: Using degraded feature set TCP instead of UDP for DNS server 192.168.208.87.
Dez 06 22:00:00 S2000 systemd-resolved[644]: Using degraded feature set UDP instead of TCP for DNS server 192.168.208.87.
Dez 06 22:00:05 S2000 systemd-resolved[644]: Using degraded feature set TCP instead of UDP for DNS server 192.168.208.87.
Dez 06 22:00:25 S2000 systemd-resolved[644]: Using degraded feature set UDP instead of TCP for DNS server 192.168.208.87.
Dez 06 22:00:30 S2000 systemd-resolved[644]: Using degraded feature set TCP instead of UDP for DNS server 192.168.208.87.

This is the status of systemd-resolved when connecting to my routers wifi. This will work as usual:

Dez 06 22:00:58 S2000 systemd-resolved[644]: Using degraded feature set UDP instead of UDP+EDNS0 for DNS server 10.5.48.1.
Dez 06 22:15:58 S2000 systemd-resolved[644]: Grace period over, resuming full feature set (UDP+EDNS0) for DNS server 10.5.48.1.
Dez 06 22:15:58 S2000 systemd-resolved[644]: Using degraded feature set UDP instead of UDP+EDNS0 for DNS server 10.5.48.1.

I am also using DNSCrypt if that is of any help.
I can re-produce this problem at any time. So please let me know if there are any logs that I can provider to help solving this issue/bug.

Thanks!


Setup 1: Thinkpad T14s G3, 14" FHD - R7 6850U - 32GB RAM - 2TB Solidigm P44 Pro NVME
Setup 2: Thinkpad X1E G1, 15.6" FHD - i7-8850H - 32GB RAM - NVIDIA GTX 1050Ti - 2x 1TB Samsung 970 Pro NVME
Accessories: Filco Majestouch TKL MX-Brown Mini Otaku, Benq XL2420T (144Hz), Lo(w)gitech G400, Puretrak Talent, Sennheiser HD800S + Meier Daccord FF + Meier Classic FF

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#2 2020-12-07 04:57:54

radix10
Member
Registered: 2020-12-07
Posts: 1

Re: systemd-resolved at 100% CPU usage, crashing firefox and skype

I also encountered the same problem

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#3 2020-12-07 05:31:25

Utini
Member
Registered: 2015-09-28
Posts: 481
Website

Re: systemd-resolved at 100% CPU usage, crashing firefox and skype

Well I fixed it for now simply by stopping and disabling systemd-resolved.service


Setup 1: Thinkpad T14s G3, 14" FHD - R7 6850U - 32GB RAM - 2TB Solidigm P44 Pro NVME
Setup 2: Thinkpad X1E G1, 15.6" FHD - i7-8850H - 32GB RAM - NVIDIA GTX 1050Ti - 2x 1TB Samsung 970 Pro NVME
Accessories: Filco Majestouch TKL MX-Brown Mini Otaku, Benq XL2420T (144Hz), Lo(w)gitech G400, Puretrak Talent, Sennheiser HD800S + Meier Daccord FF + Meier Classic FF

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#4 2020-12-10 20:57:09

eremin
Member
Registered: 2020-12-10
Posts: 1

Re: systemd-resolved at 100% CPU usage, crashing firefox and skype

Same problem, a bit annoying.  Seems this is related to systemd v247 #17870 issue [1].  It is fixed now, so waiting for the package update.

[1] https://github.com/systemd/systemd/issues/17870

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