On Donnerstag, 3. März 2022 13:54:32 CET Tobias Leupold wrote: > Hi all :-) > > I have a very odd problem, and I have no idea what could cause this or even > how to debug this. maybe, someone of you can give me a hint. > > I revently wrote a small helper program for one special purpose: Scanning > documents at a defined size, post processing them a bit and saving the > processed, compressed images as a PDF file to e.g. send them via mail. The > sources can be found at https://invent.kde.org/tleupold/scandoc/ .
Are you using either Qt5 < 5.15 or a kernel version which does not support CLONE_FD? - then you are relying on SIGCHLD for process exit notification. CLONE_FD: https://lwn.net/Articles/636646/ Qt5: https://codereview.qt-project.org/c/qt/qtbase/+/108456/ sane-backends/backend/plustek-usbhw.c messes with the signal handlers and fails to restore it: `sigaction(..., ..., NULL)` Regards, Stefan -- Stefan Brüns / Bergstraße 21 / 52062 Aachen home: +49 241 53809034 mobile: +49 151 50412019
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