FS#3833 - run ash's script over ssh often not executed

[openwrt-bot]

anmikf:

Supply the following if possible:

• Device problem occurs on
  NAME="OpenWrt"
  VERSION="19.07.7"
  ID="openwrt"
  ID_LIKE="lede openwrt"
  PRETTY_NAME="OpenWrt 19.07.7"
  VERSION_ID="19.07.7"
  HOME_URL="https://openwrt.org/"
  BUG_URL="https://bugs.openwrt.org/"
  SUPPORT_URL="https://forum.openwrt.org/"
  BUILD_ID="r11306-c4a6851c72"
  OPENWRT_BOARD="x86/64"
  OPENWRT_ARCH="x86_64"
  OPENWRT_TAINTS=""
  OPENWRT_DEVICE_MANUFACTURER="OpenWrt"
  OPENWRT_DEVICE_MANUFACTURER_URL="https://openwrt.org/"
  OPENWRT_DEVICE_PRODUCT="Generic"
  OPENWRT_DEVICE_REVISION="v0"
  OPENWRT_RELEASE="OpenWrt 19.07.7 r11306-c4a6851c72"

• Software versions of OpenWrt/LEDE release, packages, etc.

• Steps to reproduce
  1:create file '/root/test' with content:EOF
  set -x
  echo tag1
  sleep 100 &
  echo tag2
  EOF

2:run commandline:
ssh localhost 'ash /root/test'

3:the output of this commandline is out of order
!!!!!AND!!!!!
the script command 'sleep 100 &' is often not executed

[ynezz]

OpenWrt 19.07 release is EOL, try to reproduce the issue with latest supported release and feel free to ask for issue reopening if the problem is still present, thanks.