On Thu, 28 Jul 2011, Fernando Lopez-Lezcano wrote:

On 07/27/2011 02:37 PM, Thomas Gleixner wrote:

quoted

Dear RT Folks,

I'm pleased to announce the 3.0-rt4 release.

Testing rt5 (lenovo dual core laptop running fc15, kernel based on koji's
3.0.0 build plus rt5)...
----
[    0.000000] =============================================
[    0.000000] [ INFO: possible recursive locking detected ]
[    0.000000] 3.0.0-1.rt5.1.fc15.ccrma.i686.rtPAE #1
[    0.000000] ---------------------------------------------
[    0.000000] swapper/0 is trying to acquire lock:
[    0.000000]  (&parent->list_lock){+.+...}, at: [<c04fb406>]
__cache_free+0x43/0xc3
[    0.000000]
[    0.000000] but task is already holding lock:
[    0.000000]  (&parent->list_lock){+.+...}, at: [<c04fc538>]
do_tune_cpucache+0xf2/0x2bb
[    0.000000]
[    0.000000] other info that might help us debug this:
[    0.000000]  Possible unsafe locking scenario:
[    0.000000]
[    0.000000]        CPU0
[    0.000000]        ----
[    0.000000]   lock(&parent->list_lock);
[    0.000000]   lock(&parent->list_lock);

That's a know issue. Fix is being worked on. I can't find the thread
right now, but it's weird some interaction of debug options
(DEBUG_OBJECTS, DEBUG_SLAB ...) Peter ???
 

(I guess because HIGHMEM is disabled the computer only finds 800M+ of LOWMEM
and that is all top reports - total installed is 4G)

Yes, that's the state for now until someone fixes it :)

Thanks,

	tglx