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Date: Tue, 01 Jul 2014 16:56:06 +0200
From: Richard Weinberger <richard@nod.at>
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To: Akshay Bhat <abhat@lutron.com>
Subject: Re: UBIFS Panic
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Am 01.07.2014 16:46, schrieb Akshay Bhat:
> 
> 
> 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.

Good. I'll dig into that by the end of the week.

Thanks,
//richard