[LEDE-DEV] Update to util-linux 2.30.1 breaks x86_64 squashfs-combined

[Lucian Cristian]

On 29.09.2017 14:07, Felix Fietkau wrote:
> On 2017-09-29 13:04, Daniel Golle wrote:
>> On Fri, Sep 29, 2017 at 12:20:08PM +0200, Felix Fietkau wrote:
>>> On 2017-09-11 02:33, Philip Prindeville wrote:
>>>> Changing the subject from the previous thread as it turned out to not have to do with sysupgrade at all.
>>>>
>>>> What I can tell is this, having added some tracing to fstools.
>>>>
>>>> We get to the call to system() in rootdisk_volume_init():
>>>>
>>>> https://git.lede-project.org/?p=project/fstools.git;a=blob;f=libfstools/rootdisk.c;h=dd00c1b4e5b4aa9b748610fa3e93d301a67101a7;hb=HEAD#l269
>>>>
>>>> and it never seems to return.  The value of “str” is “mkfs.f2fs -q -l rootfs_data /dev/loop0”.
>>>>
>>>> What would cause this to hang rather than return an error?
>>> I've used sysrq to trace this and found out that it's hanging in the
>>> getrandom system call, which could be used through util-linux library
>>> code. That also explains why the update broke it.
>>>
>>> I will prepare a patch that forces util-linux to stick to /dev/urandom
>>> instead - that should hopefully fix this for good.
>> mkfs.f2fs also uses getrandom(3) and hangs there for some minutes when
>> creating the initial snapshot...
> I don't see any direct calls to getrandom from mkfs.f2fs, so I assume
> they are issued through util-linux libuuid. That would explain why my
> change fixes the issue (with f2fs as overlay fs) for me, and results in
> the following new warning:
>
> [    8.756017] random: mkfs.f2fs: uninitialized urandom read (16 bytes read)
>
> - Felix
>
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tested on sun7i on 2.30.1 and 2.30.2 and seems to work

[    8.808332] mount_root: rootdisk overlay filesystem has not been 
formatted yet
[    8.957393] random: mkfs.f2fs: uninitialized urandom read (16 bytes read)
[    8.969056] random: fast init done
[    9.321046] random: crng init done