[BUG] AS io-scheduler.

[Ian Kumlien <pomac@vapor.com>]

Hi, 

I had emerge --sync failing several times... 

So i checked dmesg and found some info, attached further down.
This is a old VIA C3 machine with one disk, it's been running most
kernels in the 2.6.x series with no problems until now.

PS. Don't forget to CC me
DS.

BUG: unable to handle kernel paging request at virtual address ea86ac54
 printing eip:
c022dfec
*pde = 00000000
Oops: 0000 [#1]
Modules linked in: eeprom i2c_viapro vt8231 i2c_isa skge
CPU:    0
EIP:    0060:[<c022dfec>]    Not tainted VLI
EFLAGS: 00010082   (2.6.22.1 #26)
EIP is at as_can_break_anticipation+0xc/0x190
eax: dfcdaba0   ebx: dfcdaba0   ecx: 0035ff95   edx: cb296844
esi: cb296844   edi: dfcdaba0   ebp: 00000000   esp: ceff6a70
ds: 007b   es: 007b   fs: 0000  gs: 0033  ss: 0068
Process rsync (pid: 1667, ti=ceff6000 task=d59cf5b0 task.ti=ceff6000)
Stack: cb296844 00000001 cb296844 dfcdaba0 00000000 c022efc8 cb296844
00000000 
       dfcffb9c c0227a76 dfcffb9c 00000000 c016e96e cb296844 00000000
dfcffb9c 
       00000000 c022af64 00000000 dfcffb9c 00000008 00000000 08ff6b30
c04d1ec0 
Call Trace:
 [<c022efc8>] as_add_request+0xa8/0xc0
 [<c0227a76>] elv_insert+0xa6/0x150
 [<c016e96e>] bio_phys_segments+0xe/0x20
 [<c022af64>] __make_request+0x384/0x490
 [<c02add1e>] ide_do_request+0x6ee/0x890
 [<c02294ab>] generic_make_request+0x18b/0x1c0
 [<c022b596>] submit_bio+0xa6/0xb0
 [<c013b7b8>] mempool_alloc+0x28/0xa0
 [<c016bb66>] __find_get_block+0xf6/0x130
 [<c016e0bc>] bio_alloc_bioset+0x8c/0xf0
 [<c016b647>] submit_bh+0xb7/0xe0
 [<c016c1f8>] ll_rw_block+0x78/0x90
 [<c019c85d>] search_by_key+0xdd/0xd20
 [<c016c201>] ll_rw_block+0x81/0x90
 [<c011f190>] irq_exit+0x40/0x60
 [<c01066e4>] do_IRQ+0x94/0xb0
 [<c0104bc3>] common_interrupt+0x23/0x30
 [<c018beca>] reiserfs_read_locked_inode+0x6a/0x490
 [<c018e580>] reiserfs_find_actor+0x0/0x20
 [<c018c33b>] reiserfs_iget+0x4b/0x80
 [<c018e570>] reiserfs_init_locked_inode+0x0/0x10
 [<c0189824>] reiserfs_lookup+0xa4/0xf0
 [<c0157b03>] do_lookup+0xa3/0x140
 [<c0159265>] __link_path_walk+0x615/0xa20
 [<c0168a18>] __mark_inode_dirty+0x28/0x150
 [<c01631c1>] mntput_no_expire+0x11/0x50
 [<c01596b2>] link_path_walk+0x42/0xb0
 [<c0159960>] do_path_lookup+0x130/0x150
 [<c015a190>] __user_walk_fd+0x30/0x50
 [<c0154766>] vfs_lstat_fd+0x16/0x40
 [<c01547df>] sys_lstat64+0xf/0x30
 [<c0103c42>] syscall_call+0x7/0xb
 =======================
Code: c0 8b 44 cb 0c 8b 40 08 29 d0 f7 d0 c1 e8 1f 83 f0 01 eb 02 31 c0
5b c3 8d b4 26 00 00 00 00 55 57 56 53 83 ec 04 89 c3 89 14 24 <8b> 90
b4 00 00 00 85 d2 75 04 0f 0b eb fe 83 3c 24 00 74 0c 8b 
EIP: [<c022dfec>] as_can_break_anticipation+0xc/0x190 SS:ESP
0068:ceff6a70
WARNING: at block/as-iosched.c:862 as_remove_queued_request()
 [<c022e560>] as_remove_queued_request+0x40/0xc0
 [<c022e684>] as_move_to_dispatch+0xa4/0x110
 [<c0236626>] __delay+0x6/0x10
 [<c022ee03>] as_dispatch_request+0x2d3/0x310
 [<c02b39b2>] ide_dma_start+0x22/0x30
 [<c02b6be0>] ide_do_rw_disk+0x310/0x3f0
 [<c02279b5>] elv_next_request+0x105/0x120
 [<c02ad876>] ide_do_request+0x246/0x890
 [<c03d5c9d>] schedule+0x45d/0x4c0
 [<c022e7f0>] as_work_handler+0x0/0x20
 [<c022a331>] blk_start_queueing+0x11/0x20
 [<c022e7ff>] as_work_handler+0xf/0x20
 [<c0126bab>] run_workqueue+0x6b/0xe0
 [<c0127200>] worker_thread+0x0/0xc0
 [<c01272b2>] worker_thread+0xb2/0xc0
 [<c01297e0>] autoremove_wake_function+0x0/0x40
 [<c0129658>] kthread+0x38/0x60
 [<c0129620>] kthread+0x0/0x60
 [<c0104d87>] kernel_thread_helper+0x7/0x10
 =======================
WARNING: at block/as-iosched.c:966 as_move_to_dispatch()
 [<c022e6b3>] as_move_to_dispatch+0xd3/0x110
 [<c022ee03>] as_dispatch_request+0x2d3/0x310
 [<c02b39b2>] ide_dma_start+0x22/0x30
 [<c02b6be0>] ide_do_rw_disk+0x310/0x3f0
 [<c02279b5>] elv_next_request+0x105/0x120
 [<c02ad876>] ide_do_request+0x246/0x890
 [<c03d5c9d>] schedule+0x45d/0x4c0
 [<c022e7f0>] as_work_handler+0x0/0x20
 [<c022a331>] blk_start_queueing+0x11/0x20
 [<c022e7ff>] as_work_handler+0xf/0x20
 [<c0126bab>] run_workqueue+0x6b/0xe0
 [<c0127200>] worker_thread+0x0/0xc0
 [<c01272b2>] worker_thread+0xb2/0xc0
 [<c01297e0>] autoremove_wake_function+0x0/0x40
 [<c0129658>] kthread+0x38/0x60
 [<c0129620>] kthread+0x0/0x60
 [<c0104d87>] kernel_thread_helper+0x7/0x10
 =======================

-- 
Ian Kumlien <pomac () vapor ! com> -- http://pomac.netswarm.net

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