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List:       linux-btrfs
Subject:    Re: [PATCH v2]Btrfs: pwrite blocked when writing from the mmaped buffer of the same page
From:       Rui Miguel Silva <rmfrfs () gmail ! com>
Date:       2011-01-28 18:27:17
Message-ID: 201101281827.17306.rmfrfs () gmail ! com
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On Friday, January 28, 2011 04:47:21 pm Maria Wikström wrote:
> fre 2011-01-28 klockan 03:54 +0100 skrev Johannes Hirte:
> > On Friday 28 January 2011 02:26:43 Zhong, Xin wrote:
> > > Please try the fix in below link:
> > > http://www.spinics.net/lists/linux-btrfs/msg08051.html
> > > 
> > > Thanks!
> > 
> > This doesn't fix it for me. At least there is a difference. Whereas the
> > svn process started consuming 100% CPU without any further interaction
> > before, the system just hang now. The svn process starts eating the CPU
> > when I cancel the emerge via ctrl-c. Additional I see a flush-btrfs task
> > now consuming CPU time.
> > 
> > regards,
> > 
> >   Johannes
> > 
> > --
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> 
> The patch makes the process exit cleanly but complains that there is no
> space left. It should be a few GB but it is only a few MB!? I delete 5GB
> and controls that the space is usable. Try again but this time it almost
> hangs the system, I can blink the leds and move the mouse but noting
> more.
> I boot 2.6.36.1 and use a snapshot as root, "emerge libgcrypt" compiles
> and installs fine. Boots back into 2.6.37 and try again and the system
> hangs again.
> 
> // Maria
> 

Hi Maria,
I had something similar with vanilla 2.6.37 just for running:
cscope -R -b -q

allways hang complety the process, only solution reboot.
I just applied the  btrfs patches that arrived in the main tree between the 
2.6.37 and 2.6.38-rc1 and they seem to fix the issue.

I did not have the time to try to found which patch fixed the problem.

Hope this could help you.

Cheers,
  //Rui
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