Oops 2.6.13-git6

[Lukas Hejtmanek <xhejtman@mail.muni.cz>]

Hello,

I did some experiments with my cdrom and battery switchnig.

I have modular bay for cdrom or battery. 

I have two ide devices: hda - pata disk, hdb - cdrom. I suspended into ram and
removed cdrom replacing it with battery. I resumed, then I did hotswap -c
0 rescan-ide; hotswap -c probe-ide

dd if=/dev/hdb of=/dev/null bs=512 count=1 results in:
hdb: ATAPI reset complete
hdb: status error: status=0x00 { }
ide: failed opcode was: unknown
hdb: status error: status=0x00 { }
ide: failed opcode was: unknown
hdb: status error: status=0x00 { }
ide: failed opcode was: unknown
hdb: status error: status=0x00 { }
ide: failed opcode was: unknown
hdb: ATAPI reset complete
hdb: status error: status=0x00 { }
ide: failed opcode was: unknown
Unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:
c0160f20
*pde = 00000000
Oops: 0002 [#1]
PREEMPT 
Modules linked in: skge i915 asus_acpi rtc snd_hda_intel snd_hda_codec ehci_hcd 
uhci_hcd
CPU:    0
EIP:    0060:[<c0160f20>]    Not tainted VLI
EFLAGS: 00010282   (2.6.13-git6) 
EIP is at create_empty_buffers+0x30/0xb0
eax: 00000000   ebx: c12d6240   ecx: 00000000   edx: 00000000
esi: 00000000   edi: 00000000   ebp: c1450144   esp: cba8aca0
ds: 007b   es: 007b   ss: 0068
Process dd (pid: 2750, threadinfo=cba8a000 task=d5f145e0)
Stack: c12d6240 00010000 00000001 c12d6258 c12d6240 c0161aee c12d6240 00010000 
       00000000 c1450148 c01deddc 00000001 00000020 00010000 c01df051 c1450148 
       c14500a4 00000000 cba8a000 c12d6240 c1450144 c013dba8 c1450148 00000000 
Call Trace:
 [<c0161aee>] block_read_full_page+0x29e/0x2f0
 [<c01deddc>] radix_tree_node_alloc+0x1c/0x60
 [<c01df051>] radix_tree_insert+0x81/0x130
 [<c013dba8>] add_to_page_cache+0x68/0xc0
 [<c0145811>] read_pages+0xe1/0x160
 [<c0166130>] blkdev_get_block+0x0/0x70
 [<c01430c0>] __alloc_pages+0x300/0x420
 [<c01459e0>] __do_page_cache_readahead+0x150/0x180
 [<c0145b75>] blockable_page_cache_readahead+0x55/0xd0
 [<c0145dd8>] page_cache_readahead+0x118/0x1c0
 [<c013e7b7>] do_generic_mapping_read+0x4d7/0x630
 [<c01771d3>] dput+0x93/0x240
 [<c013ebb4>] __generic_file_aio_read+0x1a4/0x210
 [<c013e910>] file_read_actor+0x0/0x100
 [<c013ed54>] generic_file_read+0xb4/0xe0
 [<c014ecb4>] __handle_mm_fault+0x1b4/0x210
 [<c0131580>] autoremove_wake_function+0x0/0x60
 [<c0116919>] do_page_fault+0x1b9/0x5b1
 [<c015e03c>] vfs_read+0x14c/0x160
 [<c015e331>] sys_read+0x51/0x80
 [<c01031b5>] syscall_call+0x7/0xb
Code: 00 53 83 ec 0c 8b 5c 24 18 89 44 24 08 8b 44 24 1c 8b 74 24 20 89 1c 24 89
 44 24 04 e8 1a f6 ff ff 89 c1 89 c2 8d b6 00 00 00 00 <09> 32 89 d0 8b 52 04 85
 d2 75 f5 89 48 04 b8 00 f0 ff ff 21 e0 


Is there some way how to change battery and cdrom without reboot?

-- 
Lukáš Hejtmánek
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