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

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - 安迷 (anmikf) 

Attached to Project - OpenWrt/LEDE Project
Summary - run ash's script over ssh often not executed
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Very Low
Priority - Very Low
Reported Version - openwrt-19.07
Due in Version - Undecided
Due Date - Undecided
Details - 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


More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3833

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