ksh script execution results in a memory fault (coredump)

Issue

• ksh script execution results in a Memory fault (coredump). User executed:

./script -U

• Further looking and debugging at the code we observed one particular line of code where redirection is done while sourcing a utility function shell script:

. /path/to/utility/functions/script 1>/dev/null 2>&1

This redirection leads to the core.

Corresponding stack trace shows invalid descriptor number:

fcntl(12, F_DUPFD, 2)                   = 2
close(12)                               = 0
fcntl(11, F_DUPFD, 4294967295)          = -1 EINVAL (Invalid argument)
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV (core dumped) +++
Memory fault(coredump)