First of all, the logs that I have come from Syncthing-Fork on Android, which is not the official application, so please forgive me if this forum is not the right place to report the issue. The problem, however, occured when using the official application too, but I just do not have the logs from it right now.
What happens is that Syncthing suddenly crashes after 10-15 minutes of operation. The crash is reproducible in my configuration. Resetting (deleting) the database or even reinstalling Syncthing completely does not help. Also, after the database has become corrupted, Syncthing refuses to start any longer unless I clear the database manually. The corruption comes back very quickly after the reset though.
One perhaps important thing may be that this seems to have started to happen only after formatting the SD card as internal storage (using the method described here: https://fossbytes.com/android-sd-card-internal-storage-adoptable-storage/). I understand that this could be a hardware issue, but this is a remotely administered device, so I cannot swap the card to check it, and I have doubts, as the card itself is high quality, has barely been used, and has not displayed any problems before.
I am attaching the log file below (with personal information removed).
syncthing.log (125.3 KB)
Please let me know if there is anything suspicious there. If necessary, I may try to narrow down the problem to a specific file, as there are only a few dozens files being synced with that device anyway.
The hardware in question is Samsung Galaxy S4 Active LTE-A (SHV-E470S) with Android 7.1 (LineageOS 14.1) installed. Also, I believe that the file system used on the data partition is F2FS, although I would need to re-check this one to be sure.