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[Bug 3310] New: Correctly restoring channel's FDs nonblocking mode
https://bugzilla.mindrot.org/show_bug.cgi?id=3310

Bug ID: 3310
Summary: Correctly restoring channel's FDs nonblocking mode
Product: Portable OpenSSH
Version: 8.6p1
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: ssh
Assignee: unassigned-bugs@mindrot.org
Reporter: dbelyavs@redhat.com

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 4d5456c

The PR intended to fix the issue is
https://github.com/openssh/openssh-portable/pull/246

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