[FS#2951] x86_64 ext4 generic: online resizing of root partition fails

[OpenWrt Bugs]

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FS#2951 - x86_64 ext4 generic: online resizing of root partition fails
User who did this - Mario Tremblay (MarioT)

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Issue was already present in the x86_64 image.

Could be related to the partition not aligned to 4k boundary.
Following workaround has allowed me to resize the ext4 "root":

mount -o remount,ro / #Remount root as ReadOnly
tune2fs -O^resize_inode /dev/mmcblk0p2 #Remove reserved GDT blocks
fsck.ext4 /dev/mmcblk0p2 #Fix part, answer yes to remove GDT blocks remnants

#reboot
resize2fs /dev/mmcblk0p2
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=2951#comment9480

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