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After launching the command several times, with debug (posted by new code in a new branch for the investigation) confirming that the same daemon handles operations from the new client instances, its strace now has numerous FDs to report after select() - so I guess it is a problem of detecting an exit of the counterpart. 0.000000 [D2] parse_at: is 'heartbeat at localhost' in AT

After launching the command several times, with debug (posted by new code in a new branch for the investigation) confirming that the same daemon handles operations from the new client instances, its strace now has numerous FDs to report after select() - so I guess it is a problem of detecting an exit of the counterpart. 0.000000 [D2] parse_at: is 'heartbeat at localhost' in AT

Hi, Great work Jim! I?m glad you could reproduce the problem and found a potential culprit. Just for my own interest I restored upsshed from my backups (version 2.7.4-13) and it seems to running ok, so no big runtime changes regarding that with Debian 12. It is not hogging CPU. From the daemon log the heartbeat seems to be working ok. Only difference between the old logs (pre Debian 12 update)

Hi, Great work Jim! I?m glad you could reproduce the problem and found a potential culprit. Just for my own interest I restored upsshed from my backups (version 2.7.4-13) and it seems to running ok, so no big runtime changes regarding that with Debian 12. It is not hogging CPU. From the daemon log the heartbeat seems to be working ok. Only difference between the old logs (pre Debian 12 update)

So... determining that FD is to be reaped proved hard. Internet lore suggests fcntl() and poll() on the FD, but it just seems valid to them. The errno is also usually not raised (once I saw a "111: Connection refused" though). So the best dumb idea so far is to bail out if we spent the whole loop (128 attempts) and only got zero-sized read replies and no errors.

So... determining that FD is to be reaped proved hard. Internet lore suggests fcntl() and poll() on the FD, but it just seems valid to them. The errno is also usually not raised (once I saw a "111: Connection refused" though). So the best dumb idea so far is to bail out if we spent the whole loop (128 attempts) and only got zero-sized read replies and no errors.

So, got some good news: I hear(*) I managed to reproduce the problem with current NUT master and an adapted copy of your posted configs and script :D Experimental debugging now sounds possible. (*) PC under the desk wails with all its cooling fans as soon as I started the client which spawned a daemon and itself had exited: $ UPSNAME=heartbeat at localhost NOTIFYTYPE=ONBATT

So, got some good news: I hear(*) I managed to reproduce the problem with current NUT master and an adapted copy of your posted configs and script :D Experimental debugging now sounds possible. (*) PC under the desk wails with all its cooling fans as soon as I started the client which spawned a daemon and itself had exited: $ UPSNAME=heartbeat at localhost NOTIFYTYPE=ONBATT