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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 23:30:24 +0200
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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.

> 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?

Thanks,
//richard