another attempt [Re: possible SMP problem in fs/inode.c?]

tewalberg en mediaone.net tewalberg en mediaone.net
Jue Ene 20 08:56:43 CST 2000


Yet another attempt to get around this ORBS thing...

The last few days, I've been getting a bunch of messages                                                                            
like:                                                                                                                               
                                                                                                                                    
Jan 11 07:37:21 calvin kernel: iput: inode 09:00/14189 still has locks!                                                             
Jan 11 07:37:23 calvin kernel: iput: inode 09:03/996435 still has locks!                                                            
Jan 11 07:37:36 calvin kernel: iput: inode 09:03/1195010 still has locks!                                                           
Jan 11 07:37:38 calvin kernel: iput: inode 09:03/541708 still has locks!                                                            
Jan 11 07:37:38 calvin kernel: iput: inode 00:01/181600258 still has locks!                                                         
Jan 11 07:37:40 calvin kernel: iput: inode 09:03/1029138 still has locks!                                                           
                                                                                                                                    
I've looked at a number of the files that these represent, and                                                                      
they are not files that are likely to be open and locked, so my                                                                     
guess is that, since this is an SMP machine, maybe iput is getting                                                                  
called on both CPUs with the same inode on (relatively rare)                                                                        
occasions? I'm not sure that makes sense, though... I've only                                                                       
seen the messages during periods of high atime activity (i.e.                                                                       
running find or backups), and I'm not sure this is indicative                                                                       
of a serious problem, but, since the code generating this is                                                                        
inside an '#ifdef INODE_PARANOIA', it kinda makes me wonder...                                                                      
                                                                                                                                    
System is a dual PPro 200MHz using a SuperMicro P6DNE, 512MB,                                                                       
2 WDC AC418000D 18GB IDE drives using RAID1 for all filesystems.                                                                    
Kernel is 2.2.13ac3 plus the ide-tape patch for an OnStream ADR                                                                     
drive.                    

  Also, I find the messages for inodes on dev 00:01 particularly                                                                      
curious, since I have no /dev node with those numbers, and                                                                          
linux/Documentation/devices.txt claims that major 0 is for unnamed                                                                  
devices. Is this /proc or /dev/pts maybe? Is updating the atime                                                                     
on such a pseudo-fs useful? Maybe these should be mounted ro...                                                                     
                                                                                                                                    
Anyway, any insight you can provide me would be useful. Thanks.                                                                     
                                                                                                                                    
                                                                                                                                    
                                tw                                                                                                  
                                                                                                                                    
--                                                                                                                                  
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| Tim Walberg                  | Phone: 847-782-2472      |                                                                         
| TERAbridge Technologies Corp | FAX:   847-623-1717      |                                                                         
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