Hello, OpenSSH incorrectly restores the standard mode (blocking mode) on standard output upon exiting. This causes the next shell scripts commands to potentially fail in EAGAIN. The reproducer is: #!/bin/sh ( ssh localhost true cat /dev/zero ) | sleep 30 Restoring the blocking modes happens with the duped file descriptors and too late. The changes causing this problem was introduced in https://github.com/openssh/openssh-portable/commit/4d5456c7de108e17603a0920c4d15bca87244921 The 2 possible fixes can be found in https://github.com/openssh/openssh-portable/pull/244 (adhoc patch) and https://github.com/openssh/openssh-portable/pull/246 (more robust one). I think it's worth fixing the issue in this, that or any other way. I'll be happy to adopt any of those patches to the state when they become suitable for upstream. Many thanks in advance! -- Dmitry Belyavskiy _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
