stop_sane_threads delays scan after button bress

[ukos-git]

I have a script, where I call scanimage which instantaneously starts scanning.

If I call the script through the scanbd daemon on button press, I am getting a delay of about 25s between button press and scan start similar to the error description on this mailing list. I have activated debug level and the reason for the delay is the following:

/usr/sbin/scanbd: stop_sane_threads: an action is active, waiting ...

scanbd/src/scanbd/sane.c

Line 1192 in a481c27

slog(SLOG_DEBUG, "sane_trigger_action: an action is active, waiting ...");

I am using scanbd as device handler for the hardware scanner. saned only has access to the net device.
scanbd was configured on debian stretch using the arch linux instructions.

scanbd version: 1.4.4-1+b2
hardware: Fujitsu ScanSnap S1500M
device name 'net:localhost:fujitsu:ScanSnap S1500:8176'