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Date: Tue, 1 Jul 2014 10:46:18 -0400
From: Akshay Bhat <abhat@lutron.com>
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To: Richard Weinberger <richard@nod.at>
Subject: Re: UBIFS Panic
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On Tue 01 Jul 2014 10:32:34 AM EDT, Richard Weinberger wrote:
> Am 01.07.2014 16:18, schrieb Akshay Bhat:
>>
>>
>> On Tue 01 Jul 2014 03:48:54 AM EDT, Richard Weinberger wrote:
>>> Am 01.07.2014 03:09, schrieb hujianyang:
>>>>>
>>>>> Is enabling UBI_FASTMAP the cause for the panic? If so I can disabled the
>>>>> feature and re-test. Do you see any compatibility issue going from:
>>>>> Current config -> New config -> Failsafe config
>>>>>
>>>>
>>>> I don't know. But I found func ubi_wl_get_peb() in drivers/mtd/ubi/wl.c
>>>> will return an error ENOSPC without any error messages. And this func
>>>> seems related with fastmap feature.
>>>
>>> I have sort of an idea what could going on.
>>> Akshay, can you please confirm that you face the issue only with UBI_FASTMAP=y?
>>
>> I have not been able to recreate the issue with UBI_FASTMAP=n
>
> Okay, you test case basically fills the filesystem over and over?
> And after some time you face the said issue.
> Is this correct?

Yes. From testing, the "some time" is typically after crossing the WL 
threshold.

> Thanks,
> //richard