FS#4028 - Extroot cannot mount after boot, block: no usable configuration

[openwrt-bot]

Op3n:

I run OpenWRT on my x86 PC(Lenovo tiny series, UEFI+amd64), use the latest 21.02 stable version, squashfs+efi, and burn into USB drive via Rufus, all new flash, no upgrade, no restore backup configuration.
I totally follow [[https://openwrt.org/docs/guide-user/additional-software/extroot_configuration|this guide]] to configure extroot, of course enablemodified the partition /dev/sda1 and something like that. But after reboot I found Extroot partition don't mount automatic as expected.
Try some times still not work I found not checked enable on luci,so I add option enabled '1' in /etc/config/fstab, but still don't work property. I also follow troublshooting on that article increase delay_root, not work, but true, mount it without problems from a shell after boot.

logread | sed -n -e "/- preinit -/,/- init -/p"
Full logs at [[https://pastebin.com/etrRj6Bt|here]] , list relative part below

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user.info kernel: [ 7.764620] block: attempting to load /etc/config/fstab
user.err kernel: [ 7.768095] block: unable to load configuration (fstab: Entry not found)
user.err kernel: [ 7.769569] block: no usable configuration

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I search and found this report:https://bugs.openwrt.org/index.php?do=details&task_id=2231, looks a patch in it but I don't know how to compile and hope use pre-compile stable release. It's old issue, but it still not marked as completed. I don't know if it's relevant.

[openwrt-bot]

Op3n:

Looks that patch will let block read fstab from /tmp/overlay/upper/etc/config/fstab instead original /etc/config/fstab