Re: kernel BUG at fs/btrfs/inode.c:2299

[Maciej Marcin Piechotka <uzytkownik2@gmail.com>]

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On Mon, 2011-09-19 at 02:44 +0200, Maciej Marcin Piechotka wrote:
> On Tue, 2011-08-30 at 14:27 +0800, Miao Xie wrote:
> > > 
> > > Unfortunately it results in freeze of system and I cannot give more
> > > details. Sometimes it happens not from fcron but then it does not result
> > > in freeze (???).
> > 
> > Could you give me the method to reproduce it?
> > 
> > Thanks
> > Miao
> 
> Sorry for spamming in this thread but I'm trying to post my findings in
> hope that somebody will understand what's going on.
> 
> Recent crash gave some valuable information IMHO:
> 
>  1. I started the autocompletion of path in zsh
>  2. At some point the zsh hanged. In ps the process was listed as
> runnable
>  3. Any access to root volume (the one that zsh was trying to readdir)
> finished in hang.
>  4. I was able to access the child volume (/home)
>  5. After some time the bug is hit. At this time strange things happens
> (screen freeze etc.). I guess that there is some strange interaction
> between KMS, X and now-hanged composite manager
> 
> Next time it happend (also during listing root directory of volume 0) I
> observed the following thing - I can log out and unmount home but the
> volume 0 remains busy and cannot be unmounted.
> 
> Things to consider:
> 
>  - It is not enabled/disabled by any mount option
>  - Is it triggered when the parent volume (say volume 0) and child
> volume are both mounted?

I cannot reproduce it when the parent volume is not mounted (snapshots
are to subvolume)

>  - Which case is it failing (I've tried to add printk but I cannot find
> the option in printk to print u64)
>  - Why it happens only during night?
> 
> Regards

Regards

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