https://bugs.winehq.org/show_bug.cgi?id=55710
--- Comment #22 from Paul Gofman pgofman@codeweavers.com --- I guess one quick way to approach what is at the address is to hack-insert infinite sleep into sigsys_handler with, e. g., Eax == 0 (letting test 0xffff syscall still to be processed), and then watch /proc/<pid>/maps.