Very rarely pine stops working after/while saving an attachment and need to be killed using kill -9 <pid>.
Seems to be some kind of race condition, sometimes it occurs twice a day and then 3 months later ...
I recently got a gdb hooked up to the process and got this stack frame:
While the process was running at 100% CPU usage.
I'm using Alpine 2.00 (LNX 1167 2008-08-23), but since the code haven't changed much i post this here.