systemd-swap fails to start as service (exit code 203)

[tlonic]

I'm on Arch, running the latest version of systemd-swap in community.

When I try to start the systemd-swap service, it fails.

• systemd-swap.service - Manage swap spaces on zram, files and partitions.
  Loaded: loaded (/usr/lib/systemd/system/systemd-swap.service; enabled; vendor preset: disabled)
  Active: failed (Result: exit-code) since Sun 2021-01-03 13:16:29 EST; 43s ago
  Process: 1236 ExecStart=/usr/bin/systemd-swap start (code=exited, status=203/EXEC)
  Main PID: 1236 (code=exited, status=203/EXEC)

Jan 03 13:16:29 valine systemd[1]: Starting Manage swap spaces on zram, files and partitions....
Jan 03 13:16:29 valine systemd[1236]: systemd-swap.service: Failed to execute /usr/bin/systemd-swap: Operation not permitted
Jan 03 13:16:29 valine systemd[1236]: systemd-swap.service: Failed at step EXEC spawning /usr/bin/systemd-swap: Operation not permitted
Jan 03 13:16:29 valine systemd[1]: systemd-swap.service: Main process exited, code=exited, status=203/EXEC
Jan 03 13:16:29 valine systemd[1]: systemd-swap.service: Failed with result 'exit-code'.
Jan 03 13:16:29 valine systemd[1]: Failed to start Manage swap spaces on zram, files and partitions..

However, running systemd-swap manually works perfectly.

# systemd-swap start
INFO: Removing working directory...
INFO: Removing files in /mnt/Media/swapfc/...
INFO: Zswap: backup current configuration: start
INFO: Zswap: backup current configuration: complete
INFO: Zswap: set new parameters: start
INFO: Zswap: Enable: 1, Comp: zstd, Max pool %: 25, Zpool: z3fold
INFO: Zswap: set new parameters: complete
INFO: Writing destroy info...
INFO: swapD: pick up devices from systemd-gpt-auto-generator
INFO: swapD: searching swap devices
INFO: swapFC: on-demand swap activation at >5055 MiB memory usage

[vilgotf]

"Operation not permitted", could you run it in debug mode and post output when it fails?
https://github.com/Nefelim4ag/systemd-swap/blob/b00c92864fd9258a072181c23300e28f2a071e5f/src/systemd-swap.py#L63

[blacklight]

Same issue here - also occurring on Arch Linux:

$ sudo systemctl start systemd-swap.service
Job for systemd-swap.service failed because the control process exited with error code.
See "systemctl status systemd-swap.service" and "journalctl -xe" for details.

$ sudo systemctl status systemd-swap.service
● systemd-swap.service - Manage swap spaces on zram, files and partitions.
     Loaded: loaded (/usr/lib/systemd/system/systemd-swap.service; enabled; vendor preset: disabled)
     Active: failed (Result: exit-code) since Fri 2021-02-19 21:36:36 CET; 3s ago
    Process: 6626 ExecStart=/usr/bin/systemd-swap start (code=exited, status=203/EXEC)
   Main PID: 6626 (code=exited, status=203/EXEC)

Feb 19 21:36:36 volta systemd[1]: Starting Manage swap spaces on zram, files and partitions....
Feb 19 21:36:36 volta systemd[6626]: systemd-swap.service: Failed to execute /usr/bin/systemd-swap: Operation not permitted
Feb 19 21:36:36 volta systemd[6626]: systemd-swap.service: Failed at step EXEC spawning /usr/bin/systemd-swap: Operation not permitted
Feb 19 21:36:36 volta systemd[1]: systemd-swap.service: Main process exited, code=exited, status=203/EXEC
Feb 19 21:36:36 volta systemd[1]: systemd-swap.service: Failed with result 'exit-code'.
Feb 19 21:36:36 volta systemd[1]: Failed to start Manage swap spaces on zram, files and partitions..

Note that the output above is printed with IS_DEBUG=True, no extra debug lines are available.

When I start it through the systemd-swap executable everything works fine though.

[oold]

I did some searching and the issue could be that python3 is not where the script expects it to be, which would be /usr/bin/python3. Could also be something with SELinux or the file not having executable permissions. Whatever it is, it fails when trying to spawn the process with execve().