Re: ubi_wl_get_peb: Unable to get a free PEB from user WL pool

Richard Weinberger
2015-08-05T21:52:51Z

Jörg,

Am 05.08.2015 um 23:38 schrieb Jörg Krause:
> On Mi, 2015-08-05 at 23:30 +0200, Richard Weinberger wrote:
>> Jörg,
>>
>> Am 05.08.2015 um 23:22 schrieb Jörg Krause:
>>> Hi,
>>>
>>> after updating a custom build Linux Kernel from 4.0.8 to 4.1.4 my
>>> system fails to attach an MTD partition. Note, that everything
>>> worked
>>> fine with Linux Kernels before 4.1.
>>
>> UBI Fastmap saw a lot of changes in 4.1.
>>
>>> The error message is:
>>> ubi_wl_get_peb: Unable to get a free PEB from user WL pool
>>> autoresize: cannot auto-resize volume 0
>>
>> Can you please share the full kernel log?
>> Especially I'm interested in the fastmap pool sizes.
>
> I attached the kernel boot log.

Thanks.
That's a really small UBI setup.
[ 3.202421] ubi1: default fastmap pool size: 10
[ 3.207174] ubi1: default fastmap WL pool size: 5

>>
>>> The MTD partition has a size of 36 MB. The UBIFS image is created
>>> with:
>>> mkfs.ubifs -v -F -m 2048 -e 124KiB -c 264 -d user -o user.ubifs
>>>
>>> The UBI image is created with:
>>> ubinize -v -o data.ubi -m 2048 -p 128KiB ubinize.ini
>>>
>>> ubinize.ini:
>>> [user]
>>> mode=ubi
>>> image=user.ubifs
>>> vol_id=0
>>> vol_type=dynamic
>>> vol_name=user
>>> vol_flags=autoresize
>>>
>>>
>>> It works, if I replace the vol_flags with vol_size=32480KiB. But
>>> that's
>>> not a final solution for me.
>>>
>>> Any idea what is wrong here?
>>
>> Not sure. Maybe fastmap claims too much PEBs.
>> BTW: Are you actually using fastmap or is it just enabled in your
>> kernel config?
>
> It is enabled in the kernel config. Not sure how to use it.

Then just disable it. :)
Meanwhile I'll find out what exactly is going on.

Thanks,
//richard