2.6.23 regression: do_nanosleep will not return

Hi,

we have a system here were e.g. "sleep 1" will never finish. This is an 
issue of 2.6.23, on all older kernel versions it did work fine.

Seems to hang in do_nanosleep() 

[  153.775792] sleep         S 0000000000000000     0  5372   5341              
[  153.782385]  ffff81007f0a9ea8 0000000000000082 0000000000000000 0000000000008efc                                                                             
[  153.790635]  ffff81007f0a9e48 ffffffff802447b4 ffff81007f0c3080 0000000300000000                                                                             
[  153.798938]  ffff81007f0c39c8 ffff81007f0c37c0 000000004001d908 0000000000000000                                                                             
[  153.806991] Call Trace:                                                      
[  153.809937]  [<ffffffff8048e4cd>] do_nanosleep+0x42/0x75                     
[  153.815727]  [<0000000000000001>]                                            
[  153.819383]                                                                  
[  153.775792] sleep         S 0000000000000000     0  5372   5341              


[  330.669444] SysRq : Show Pending Timers                                      
[  330.673552] Timer List Version: v0.3                                         
[  330.677326] HRTIMER_MAX_CLOCK_BASES: 2                                       
[  330.681282] now at 255011372633 nsecs                                        
[  330.829981] active timers:                                                   
[  330.832859]  #0: <ffff81007f0e3de8>, hrtimer_wakeup, S:01                    
[  330.838805]  # expires at 260156346358 nsecs [in 5144973725 nsecs]           

[  337.046189] now at 261387685432 nsecs                                        
[  337.194966] active timers:                                                   
[  337.197834]  #0: <ffff81007f0e3de8>, hrtimer_wakeup, S:01                    
[  337.203793]  # expires at 260156346358 nsecs [in 18446744072478212542 nsecs] 
[  330.669444] SysRq : Show Pending Timers


Any ideas?

Thanks,
Bernd

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