UBI/UBIFS corruptions during random power-cuts

[Bhuvanchandra DV]

On 02/13/2017 05:15 PM, Bhuvanchandra DV wrote:
> On 02/13/2017 01:27 PM, Richard Weinberger wrote:
>
>> Bhuvan,
>>
>> Am 13.02.2017 um 04:34 schrieb Bhuvanchandra DV:
>>> On 02/10/2017 06:31 PM, Richard Weinberger wrote:
>>>
>>>> Bhuvan,
>>>>
>>>> Am 09.02.2017 um 05:59 schrieb Bhuvanchandra DV:
>>>>>> Just in case, you can trigger this also with a fresh filesystem?
>>>>>> Or did you always keep the same one?
>>>>> Yes, I triggered it with fresh filesystem.
>>>> Okay. Not good.
>>>>
>>>> How do you trigger this? What workload is running while the power-cut
>>>> happens?
>>> The issue is triggered when doing a continous external power-cut for 
>>> every
>>> 25sec since power ON. After a week or two observed this issue. There 
>>> is no
>>> additional work load on CPU during the test, it just boots to a lxde 
>>> desktop.
>> So, the power-cut happens while the system is idle? Hmm.
>
> May be not, sometimes power-cut might happen during boot. Sometimes I 
> observed
> journalctl logging just before power-cut.
>
>>
>>>> Did you try also kernel 4.9?
>>> I did ran similar testes on our downstream kernel 4.4 and 4.9 kernel 
>>> few weeks
>>> back, observed similar issues.
>> Okay, so I didn't break it lately. Puh... ;)
>
> :)
>
>>
>>>> Does it also only happen then xattrs are used?
>>> Didn't check that. How exactly to check whether xattr is used ?
>> i.e. is a LSM such das SELinux being used?
>
> No, not used so far.

I was wrong, systemd version which we use lately is enabled with access control lists(ACL).
...
[    3.324846] systemd[1]: systemd 230 running in system mode. (+PAM -AUDIT -SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP -LIBCRYPTSETUP -GCRYPT -GNUTLS +ACL +XZ -LZ4 -SECCOMP +BLKI)
...

Will do the test with a systemd without ACL support.

--
Bhuvan


>
> -- 
> Bhuvan
>
>>
>> Thanks,
>> //richard
>