[FS#533] anon_mount 1 in fstab freezes boot in wrt3200acm

[LEDE Bugs]

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FS#533 - anon_mount 1 in fstab freezes boot in wrt3200acm
User who did this - Hannu Nyman (hnyman)

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Really strange.
I flashed the other partition with LEDE master with kernel 4.9, and tested fstab anon_mount there. It seemed to work there, so I switched the router to boot again from the same 17.01 firmware that failed yesterday with anon_mount 1. And to my surprise anon_mount 1 works now with the 17.01 firmware, too. (The same firmware as yesterday, as I have not reflashed it)

The only difference is that now the other partition has been flashed once with LEDE, as yesterday there was still the Netgear OEM firmware in the other partition.

Now "/sbin/block mount" works also with anon_mount 1 active, and shows a second ubi partition. Unlike yesterday:

    17.01.0-rc2, r3131-42f3c1f

    root at LEDE:~# /sbin/block mount
    block: /dev/ubiblock0_0 is already mounted on /rom
    block: /dev/ubi0_1 is already mounted on /overlay
    block: /dev/ubi1_0 is already mounted on /mnt/ubi1_0

    root at LEDE:~# df
    Filesystem           1K-blocks      Used Available Use% Mounted on
    /dev/root                 2560      2560         0 100% /rom
    tmpfs                   256812       592    256220   0% /tmp
    /dev/ubi0_1              58604      5512     50064  10% /overlay
    overlayfs:/overlay       58604      5512     50064  10% /
    ubi1:syscfg              71908       476     67724   1% /tmp/syscfg
    tmpfs                      512         0       512   0% /dev
    /dev/ubi1_0              71908       476     67724   1% /mnt/ubi1_0

It looks like the syscfg partition gets now mounted both as /tmp/syscfg and /mnt/ubi1_0

So, just a hypothesis, but possibly /sbin/block misdetects something when it scans the partitions, if the other partition contains the Netgear OEM firmware. Possibly some naming or formatting is slightly different?

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=533#comment1878