Hi Richard,

I'm currently in the process of updating the kernel version within OpenWrt. (4.14.68 to 4.14.69)

Testing shows some issues on devices using specifically UBIFS.
Altering a perfect valid writable file shows weird errors:


[ Node 2 | node-2 ] ls -l /root/custom/scripts/banner.sh
-rwxr-xr-x    1 root     root           283 Sep 11 09:52 /root/custom/scripts/banner.sh

[ Node 2 | node-2 ] cat /root/custom/scripts/banner.sh
#!/bin/sh

if [ ! -f /root/.banner_ok ]
then
    RELEASE=$(cat /root/build_date)
    VERSION=$(cat /root/version)

    echo "Generating banner: $VERSION $RELEASE"
    sed s/VERSION/$VERSION/g /root/custom/banner > /etc/banner
    sed -i s/RELEASE/$RELEASE/g /etc/banner

    touch /root/.banner_ok
fi

[ Node 2 | node-2 ] echo "test" > /root/custom/scripts/banner.sh
-ash: can't create /root/custom/scripts/banner.sh: nonexistent directory



I'm also noticing other apps fail because /etc doesn't exists yet after UBIFS boot loading.
these 2 issues were not seen on 4.14.68.

The bootlog doesn't show any error:
https://pastebin.com/raw/dJx47uBp


I'm only seeing these issues on UBIFS enabled volumes.

It seems it's related to one of your 5 commits, but I'm still in the process of bisecting to find the actual culprit. As soon as I've found it, I'll let you know, but maybe you already have an idea here?



Thanks,

Koen

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