Minipot seems to be stuck and causing 100% CPU load

I am using Turris 1.1, HBL branch and in htop I was able to see that one core is being used at 100%.

In log, I was not able to see anything as my message log was flooded by tvheadend (my issue caused by CA module). However, once I restarted minipot (/etc/init.d/sentinel-minipot restart) I was able to see this rows and since then it is working flawlessly:

Aug  1 11:32:07 turris kernel: [221493.956769] Minipot [FTP][5540]: unhandled signal 11 at 00000104 nip b79ec458 lr b79ec438 code 1
Aug  1 11:32:07 turris kernel: [221493.956769] Minipot [FTP][5540]: unhandled signal 11 at 00000104 nip b79ec458 lr b79ec438 code 1

Which was reported to us on support #1112351. It is possible that it happens on other platforms, but currently it is noticed on Turris 1.x routers.

cc: @kkoci