[Bug 1583237] Re: lxc-attach strange tty behavior (kills command) when stderr is redirected to a file

John Doe torok.flow at gmail.com
Wed May 18 16:15:59 UTC 2016


"sudo lxc-attach -n utest -- dd if=/dev/zero of=/tmp/foo bs=1M count=10
2>&1" Works

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https://bugs.launchpad.net/bugs/1583237

Title:
  lxc-attach strange tty behavior (kills command) when stderr is
  redirected to a file

Status in autopkgtest package in Ubuntu:
  New
Status in lxc package in Ubuntu:
  New

Bug description:
  On a fresh Ubuntu 16 release, commands started by lxc-attach such as
  dd are being killed WHEN REDIRECTING stderr (to a file), and lxc-
  attach return a zero status. Command works fine without the
  redirection.

  This scenario is working on Ubuntu 15 with previous lxc release, but
  not on new LXC 2.0.0 (same issue on 2.0.1 too)

  sudo apt-get -y install lxc
  sudo lxc-create -n utest -t ubuntu -- -a amd64 -b $USER
  sudo lxc-start -d --name utest

  sudo lxc-attach -n utest -- dd if=/dev/zero of=/tmp/foo bs=1M count=10 2>/tmp/bar
  sudo lxc-attach -n utest -- ls -lh /tmp/foo
  -rw-r--r-- 1 root root 0 May 18 05:46 /tmp/foo

  Might be related to bug 1553097 (and/or
  https://github.com/lxc/lxc/pull/873)

  NOTE: Sometimes the "sudo lxc-attach -n utest_bizio_tests -- ls -lh
  /tmp/foo" ALSO does not return anything (no output)

  I'm available for any additional info.

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