This is a known issue where getcontext(3) is writing past the end of
the ucontext_t struct when _XOPEN_SOURCE is not defined (rdar://problem/5578699
). As a workaround, define _XOPEN_SOURCE before including ucontext.h.
While I don't understand why you're getting a bus error (haven't
looked at the library source), the problem appears to go away if you
declare ctx as a global instead of on the stack. Perhaps
getcontext() just won't let you save context onto the stack....
The buffer overflow that wipes out the return address, causing the bus
error. By using a global, the memory corruption still occurs, but
doesn't manifest itself as a bus error with main() returning so quickly.
- Kevin
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