This is with OpenSSH 3.4p1.
In the function wtmpx_get_entry() in the file loginrec.c from lines
1264 through 1292 there is a while-loop with the test condition
of "!found". Within the while-loop when the test condition wtmpx_islogin()
returns true the action "found = 1;" should be done.
Otherwise the while-loop will loop forever on a wtmpx login entry and the
entry following it. Found while running the code.
When "found = 1;" is added before line  1286 (the "continue;") the code performs
as would be expected.