Hello,

Kernel is 2.6.9-rc1-mm5. I just found this on dmesg. Not sure what the box was 
doing at that time:

Badness in cfq_sort_rr_list at drivers/block/cfq-iosched.c:428
 [<c01e3674>] cfq_add_crq_rb+0xe2/0x144
 [<c01e4215>] cfq_enqueue+0x33/0x5f
 [<c01e42ad>] cfq_insert_request+0x6c/0xe3
 [<c01de2d2>] __elv_add_request+0x3f/0x79
 [<c01e0940>] __make_request+0x402/0x449
 [<c01e0aa2>] generic_make_request+0x11b/0x12d
 [<c01e0b5f>] submit_bio+0xab/0xb3
 [<c0156261>] mpage_bio_submit+0x23/0x29
 [<c015658d>] do_mpage_readpage+0x242/0x29d
 [<e0b97fdc>] xfs_iomap+0x3be/0x3cc [xfs]
 [<c0197d4f>] radix_tree_node_alloc+0x13/0x46
 [<c012736b>] add_to_page_cache+0x2f/0x64
 [<c0156680>] mpage_readpages+0x98/0x10a
 [<c016fd6d>] reiserfs_get_block+0x0/0x109d
 [<c02b517a>] arp_bind_neighbour+0x3f/0x6a
 [<c0295886>] rt_intern_hash+0x2d8/0x2e8
 [<c0170e20>] reiserfs_readpages+0x16/0x1a
 [<c016fd6d>] reiserfs_get_block+0x0/0x109d
 [<c012cae5>] read_pages+0x27/0xec
 [<c012a89d>] buffered_rmqueue+0x13b/0x166
 [<c012a9c7>] __alloc_pages+0xff/0x2de
 [<c02878af>] kfree_skbmem+0x17/0x1c
 [<c012cdd9>] do_page_cache_readahead+0xe8/0x109
 [<c012cf36>] page_cache_readahead+0x13c/0x1a7
 [<c01278ad>] do_generic_mapping_read+0xcd/0x33a
 [<c0127d47>] __generic_file_aio_read+0x165/0x17f
 [<c0127b1a>] file_read_actor+0x0/0xc8
 [<c0127e57>] generic_file_read+0xaa/0xc3
 [<c01223cd>] autoremove_wake_function+0x0/0x3a
 [<c013d705>] vfs_read+0xae/0xd8
 [<c0144fdd>] kernel_read+0x38/0x41
 [<c0145760>] prepare_binprm+0xbd/0xc8
 [<c0145b3c>] do_execve+0x146/0x247
 [<c0146f61>] getname+0x5d/0x94
 [<c01038fb>] sys_execve+0x2b/0x59
 [<c0104975>] sysenter_past_esp+0x52/0x71

Do you need more info?

Thanks,
Norberto