[systemd-devel] systemd-ask-password causes systemd to use very high CPU

[Barry Scott]

I opened this bug: https://bugzilla.redhat.com/show_bug.cgi?id=1919538 <https://bugzilla.redhat.com/show_bug.cgi?id=1919538>

I'd love to know if there is a work around until you have time to make a fix.

Barry



> On 16 Jan 2021, at 15:42, Barry Scott <barry at barrys-emacs.org> wrote:
> 
> I have a reproducible problem with systemd-ask-password.
> 
> # rpm -q systemd
> systemd-246.7-2.fc33.x86_64
> 
> 1. boot fedora 33
> 2. login to KDE
> 3. start a terminal and run top
> 4. start a terminal and run:
>   systemctl >before
>   systemd-ask-password 'testing: ' </dev/null >p
> 5. Observe that top is showing systemd using ~80% CPU
> 6. stop systemd-ask-password and CPU returns to idle
>   systemctl >after
> 7. Check journal:
> 
> Jan 16 15:18:19 vmf33.chelsea.private systemd[1]: Condition check resulted in Forward Password Requests to Plymouth being skipped.
> Jan 16 15:18:19 vmf33.chelsea.private systemd[1]: Condition check resulted in Forward Password Requests to Plymouth being skipped.
> Jan 16 15:18:19 vmf33.chelsea.private systemd[1]: Condition check resulted in Forward Password Requests to Plymouth being skipped.
> Jan 16 15:18:19 vmf33.chelsea.private systemd[1]: Condition check resulted in Forward Password Requests to Plymouth being skipped.
> Jan 16 15:18:19 vmf33.chelsea.private systemd[1]: Condition check resulted in Forward Password Requests to Plymouth being skipped.
> Jan 16 15:18:19 vmf33.chelsea.private systemd[1]: Condition check resulted in Forward Password Requests to Plymouth being skipped.
> etc...
> 
> # journalctl -b  | grep Condition | wc -l
> 37555
> 
> 8. run again:
>   systemd-ask-password 'testing: ' </dev/null >p
> 9. messgae sent to all terminals:
> Broadcast message from root at vmf33.chelsea.private (Sat 2021-01-16 15:28:02 GMT):
> 
> Password entry required for 'testing:' (PID 1862).
> Please enter password with the systemd-tty-ask-password-agent tool.
> 
> -----
> 
> Looking at the services before and after running systemd-ask-password once I see this diff:
> 
> # diff -u before after | grep '^[-+]'
> --- before      2021-01-16 15:35:51.850438282 +0000
> +++ after       2021-01-16 15:36:08.875736785 +0000
> -  systemd-ask-password-plymouth.path                                                                       loaded active waiting   Forward Password Requests to Plymouth Directory Watch                                                            
> -  systemd-ask-password-wall.path                                                                           loaded active waiting   Forward Password Requests to Wall Directory Watch                                                                
> +  systemd-ask-password-wall.path                                                                           loaded active running   Forward Password Requests to Wall Directory Watch                                                                
> -  fprintd.service                                                                                          loaded active running   Fingerprint Authentication Daemon                                                                                
> +  systemd-ask-password-wall.service                                                                        loaded active running   Forward Password Requests to Wall                                                                                
> -196 loaded units listed. Pass --all to see loaded but inactive units, too.
> +195 loaded units listed. Pass --all to see loaded but inactive units, too.
> 
> I am seeing this behaviour on two systems. A dell laptop and a VMware VM.
> 
> Is there anything I can do to help debug this?
> Or just raise a big report?
> 
> What work around would you suggest I use until this is fixed?
> 
> Barry
> 
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