Re: hard freezes with 3.9.0 during io-intensive loads

[Kai Krakow <hurikhan77+btrfs@gmail.com>]

Jan Schmidt <list.btrfs@jan-o-sch.net> schrieb:

>> Apparently, it's not fixed. The system does not freeze now but it threw
>> multiple backtraces right in front of my Xorg session. The backtraces
>> look a little bit different now. Here's what I got:
>> 
>> https://gist.github.com/kakra/8a340f006d01e146865d
>> 
>> Occurence while running "bedup dedup --defrag --size-cutoff
>> $((1024*1024))" which was currently dedup'ing my backup volume with daily
>> snapshots filled by "rsync --inplace" - so I suppose some file contents
>> are pretty scattered.
> 
> At least that looks different for now. I'm not certain about all the fixes
> in btrfs-next. Can you give it a try and bisect if btrfs-next is good?
> That would be really helpful.

I'd prefer to not bisect my production system kernel... That will probably 
take ages as running the "reproducable test" takes about 30-60 minutes 
before the problem hits my system. At least unless you had a suggestion how 
to speed up the process... ;-)

I saw the pull request with those fixes, so I supsect it didn't go into 
3.9.1 but rather will go into 3.9.2?

I probably wait and just do not run the dedup process until I have 3.9.2 
installed. The backup works with occassional hiccups, the system very very 
sometimes freezes but I almost always see the backtraces in dmesg after 
backup. Let's see if it's all gone in 3.9.2.

Regards,
Kai