[FS#3798] flashing the install image leaves overlay filesystem in undefined state

[OpenWrt Bugs]

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

User who did this - Shivaram Lingamneni (slingamn) 

Attached to Project - OpenWrt/LEDE Project
Summary - flashing the install image leaves overlay filesystem in undefined state
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - I'm using the image builder for 21.02.0-rc1, specifically the one targeting bcm2709.

When I flash an install image, the resulting system image references an overlay filesystem (an ext4), the superblock of which is beyond the end of the install image itself. Therefore, flashing an install image may leave files from a previous overlay filesystem in place. This is counterintuitive, because I expected that flashing the install image would leave the OS in a well-defined state.

As a workaround, I've been appending 64KB of zeroes to the end of the install image, which seems to fix the problem.

Reproduction steps:

1. Build an image, flash it, boot it
2. Create files in the overlay filesystem
3. Remove card and reflash; files in the overlay filesystem remain

Thanks for your time!

 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3798

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