In support/shell-container.c (run_command_arra): 228 if (new_stderr != 2) 229 { 230 dup2 (new_stderr, 2); 231 close (new_stdout); 232 } This looks like a typo. We should close new_stderr after the dup2.
Fixed in 542160f0b6a7c26758c9575a8876f6624a5dd65f