> I don't know what's causing this. Is there some algorithm inside ksh > that could be running into complexity issues somehow?
Likely glob. Many glob implementations were found to suffer from complexity issues: https://research.swtch.com/glob The glob(3) in libc was fixed https://github.com/openbsd/src/commit/5c36dd0c22429e7b00ed5df80ed1383807532b59 but ksh's builtin glog still has the issue. A quick ktrace seems to confirm that (I terminated the shell after it hung a while): 58829 sh 5.883025 RET getdents 1832/0x728 58829 sh 40.637429 PSIG SIGTERM caught handler=0x64287f47850 mask=0<> This likely points to the readdir call in globit() before globit() recurses: https://github.com/openbsd/src/blob/master/bin/ksh/eval.c#L1089-L1102
