Re: Changes to the FireWire kernel drivers in Linux 3.1

[Jack C. <jac...@ma...>]

Stephan Richter,

I have been relying on Ubuntu 11.10 and I must reboot to minimize expose to this problem.
Also, I redistribute a shareware application in a bootable iso file, and I need to remaster when this is fixed.

Please send a heads-up when you know anything positive about this problem.  Thanks.

Jack Chaney


On Nov 3, 2011, at 11:05 AM, Stefan Richter wrote:

> On Oct 05 Stefan Richter wrote:
>> PS, unrelated to the 1394 subsystem but related to 1394 storage devices:
>> The last few kernel releases had multiple bugs WRT hot removal of hard
>> disks, CD ROM drives, card readers and so on.  The word is that the last
>> known one of these bugs has been fixed in 3.1-rc9 from yesterday.
> 
> Not true.  Sadly, the Linux block layer remains buggy WRT device removal.
> AFAIU a thorough rework of the block layer with introduction of proper
> reference counting is required to get this class of bugs really fixed.
> Considering that there was a steady, frequent stream of related bug reports
> for about a year now, and presumed fix after presumed fix was applied
> without ultimate progress in the matter, it is easy to make an estimate
> how quick this is going to be resolved.
> 
> While I did not see a kernel panic anymore myself lately, processes and
> kernel threads tend to fall into uninterruptible wait state if a storage
> device is removed.
> 
> Note to self:  Always kill udisks-deamon before removing a CD-ROM drive or
> a card reader, to reduce exposure to race conditions.
> -- 
> Stefan Richter
> -=====-==-== =-== ---==
> http://arcgraph.de/sr/
> 
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