Hi all,

I think I have an oops that might be preempt related with
2.6.0-test8-mm1 when I'm trying to use PostgreSQL.  I don't see this
happen on another system with preempt disabled.  I have a Symbios scsi
controller and an Adaptec raid controller, the latter is what I believe
is being used then the oops occurs. I'll copy the oops and attach my
.config:

Unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:                                                              
c0142e7c      
*pde = 0ce94001
*pte = 00000000
Oops: 0000 [#1]
PREEMPT SMP    
CPU:    4   
EIP:    0060:[<c0142e7c>]    Not tainted VLI
EFLAGS: 00010002                            
EIP is at page_address+0x8/0xa1
eax: 00000000   ebx: 00000000   ecx: 3dbff000   edx: c6568920
esi: f6af4600   edi: 00000010   ebp: 00000008   esp: d8b819f4
ds: 007b   es: 007b   ss: 0068                               
Process postmaster (pid: 14661, threadinfo=d8b80000 task=f6df8710)
Stack: ef0ed780 f6af4600 00000010 00000008 c01fb272 00000000 f6af4600 d05229e0 
       f6af4600 d05229e0 00140820 00000000 00000000 00000000 00000000 ef0ed780 
       00000010 f6af4600 ca1ba220 00000000 c01fb6d6 f6af4600 d05229e0 0a97d5f0 
Call Trace:                                                                    
 [<c01fb272>] __make_request+0x1f2/0x517
 [<c01fb6d6>] generic_make_request+0x13f/0x193
 [<c0260af9>] __map_bio+0x2e/0xe3             
 [<c0260dea>] __clone_and_map+0x16f/0x24f
 [<c011dae1>] autoremove_wake_function+0x0/0x36
 [<c0260f9e>] __split_bio+0xd4/0xe5            
 [<c026104c>] dm_request+0x9d/0xb0 
 [<c01fb6d6>] generic_make_request+0x13f/0x193
 [<c0157c03>] bio_alloc+0xbd/0x179            
 [<f8974bcd>] ext3_get_block+0x3c/0x6f [ext3]
 [<c01fb772>] submit_bio+0x48/0x85           
 [<c0171c07>] mpage_bio_submit+0x23/0x29
 [<c0171f2e>] do_mpage_readpage+0x201/0x3c6
 [<f8974b23>] ext3_get_block_handle+0x265/0x2d3 [ext3]
 [<f8946d6c>] do_get_write_access+0x370/0x6ea [jbd]   
 [<c0136921>] add_to_page_cache+0x4e/0x11c         
 [<c01721fd>] mpage_readpages+0x10a/0x14f 
 [<f8974b91>] ext3_get_block+0x0/0x6f [ext3]
 [<f8975743>] ext3_readpages+0x16/0x1a [ext3]
 [<f8974b91>] ext3_get_block+0x0/0x6f [ext3] 
 [<c013cb65>] read_pages+0x12d/0x139        
 [<c013a924>] buffered_rmqueue+0xe2/0x189
 [<c013aa70>] __alloc_pages+0xa5/0x2e3   
 [<c013ced6>] do_page_cache_readahead+0x126/0x1d7
 [<c013d086>] page_cache_readahead+0xff/0x13a    
 [<c01375ac>] do_generic_mapping_read+0x495/0x49e
 [<c01375b5>] file_read_actor+0x0/0xc8           
 [<c0137817>] __generic_file_aio_read+0x19a/0x1d8
 [<c01375b5>] file_read_actor+0x0/0xc8           
 [<c013787b>] generic_file_aio_read+0x26/0x2a
 [<c0152e07>] do_sync_read+0xa4/0xd4         
 [<c0119df2>] recalc_task_prio+0x8f/0x171
 [<c011dae1>] autoremove_wake_function+0x0/0x36
 [<c011b892>] __wake_up_common+0x2c/0x52       
 [<c011b8e0>] __wake_up+0x28/0x4f       
 [<c0152ec1>] vfs_read+0x8a/0xc8 
 [<c01530c6>] sys_read+0x2b/0x45
 [<c02c60ee>] sysenter_past_esp+0x43/0x65
                                         
Code: c0 75 e8 0f 0b d7 01 49 70 2d c0 eb de 8b 44 24 04 69 c0 01 00 37 9e c1 e8 19 c1 e0 05 05 00 04 3f c0 c3 55 57 56 53 8b 5c 24 14 <8b> 03 a9 00 01 00 00 75 1d 2b 1d 10 34 3f c0 c1 fb 03 69 db cd

Thanks!

-- 
Mark Wong - - markw@osdl.org
Open Source Development Lab Inc - A non-profit corporation
12725 SW Millikan Way - Suite 400 - Beaverton, OR 97005
(503) 626-2455 x 32 (office)
(503) 626-2436      (fax)