New ZFSv28 patchset for 8-STABLE: Kernel Panic

[Martin Matuska]

Please don't consider these patches as production-ready.
What we want to do is find and resolve as many bugs as possible.

To help us fix these bugs, a way to reproduce the bug from a clean start
(e.g. in virtualbox) would be great and speed up finding the cause for
the problem.

Your problem looks like some sort of deadlock. In your case, when you
experiene the hang, try running "procstat -k -k PID" in another shell
(console). That will give us valuable information.

Cheers,
mm

Dňa 28.12.2010 18:39, Jean-Yves Avenard  wrote / napísal(a):
> On 29 December 2010 03:15, Jean-Yves Avenard <jyavenard at gmail.com> wrote:
> 
>> # zpool import
>> load: 0.00  cmd: zpool 405 [spa_namespace_lock] 15.11r 0.00u 0.03s 0% 2556k
>> load: 0.00  cmd: zpool 405 [spa_namespace_lock] 15.94r 0.00u 0.03s 0% 2556k
>> load: 0.00  cmd: zpool 405 [spa_namespace_lock] 16.57r 0.00u 0.03s 0% 2556k
>> load: 0.00  cmd: zpool 405 [spa_namespace_lock] 16.95r 0.00u 0.03s 0% 2556k
>> load: 0.00  cmd: zpool 405 [spa_namespace_lock] 32.19r 0.00u 0.03s 0% 2556k
>> load: 0.00  cmd: zpool 405 [spa_namespace_lock] 32.72r 0.00u 0.03s 0% 2556k
>> load: 0.00  cmd: zpool 405 [spa_namespace_lock] 40.13r 0.00u 0.03s 0% 2556k
>>
>> ah ah !
>> it's not the separate log that make zpool crash, it's the cache !
>>
>> Having the cache in prevent from importing the pool again....
>>
>> rebooting: same deal... can't access the pool any longer !
>>
>> Hopefully this is enough hint for someone to track done the bug ...
>>
> 
> More details as I was crazy enough to try various things.
> 
> The problem of zpool being stuck in spa_namespace_lock, only occurs if
> you are using both the cache and the log at the same time.
> Use one or the other : then there's no issue
> 
> But the instant you add both log and cache to the pool, it becomes unusable.
> 
> Now, I haven't tried using cache and log from a different disk. The
> motherboard on the server has 8 SATA ports, and I have no free port to
> add another disk. So my only option to have both a log and cache
> device in my zfs pool, is to use two slices on the same disk.
> 
> Hope this helps..
> Jean-Yves
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