XFS hang during xfs_fsr run

[Christoph Hellwig]

On Thu, Mar 04, 2010 at 03:20:39PM +0100, Michael Weissenbacher wrote:
> Hi Christoph/Dave!
>> Also when you next rebuilt the kernel please make sure to include
>> CONFIG_KALLSYMS in the configuration, possibly CONFIG_KALLSYMS_ALL too.
>> This will help greatly with decoding any kind of warning / oops.
> Thanks for this information. Unfortunately my current kernel was built  
> without CONFIG_KALLSYMS. I'm now recompiling with CONFIG_KALLSYMS and  
> CONFIG_KALLSYMS_ALL set. I reckon that my old traces can't be  
> ksymoops'ed even if i enable that kernel option now? I will see if i can  
> get a fresh trace then (even though i hope it won't happen again).

There's an old userspace ksymoops tool which we used before kallysyms
was around.  I don't remember the exact usage, just that it was a real
pain.

> Whats's interesting is that i have the no-defrag flag set on the whole  
> /var/log directory and still it seemed to hang on that log file.

What no-defrag flag?