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Subject: Re: ubi_wl_get_peb: Unable to get a free PEB from user WL pool
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From: Richard Weinberger <richard@nod.at>
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Date: Wed, 5 Aug 2015 23:45:47 +0200
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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