OOPS in idescsi_end_request

While burning a CD tonight I ended up taking an oops on my system. I had the lkcd patch applied to my 2.4.19 kernel, so I was able to look at the
oops after my system rebooted. After digging into it a little and
looking at the ide-scsi code I think I found the problem but am not sure. How can idescsi_reset simply return SCSI_RESET_SUCCESS to the scsi mid layer? I think what is happening is that a command times out, idescsi_abort is called, which returns SCSI_ABORT_SNOOZE. Later on idescsi_reset gets called, which returns SCSI_RESET_SUCCESS. At this point the scsi mid-layer owns the scsi_cmnd and returns the failure back up the chain. Later on, the command gets run through idescsi_end_request, which then tries to access the scsi_cmnd structure which is it no longer owns.

Any help is appreciated. I have a complete lkcd dump of the failure if anyone would like more information...

-Brian King

Here is the last bit in the log buffer:

<4>scsi : aborting command due to timeout : pid 2534304, scsi0,
channel 0, id 1, lun 0 Write (10) 00 00 01 1e 91 00 00 1b 00
<4>hdk: timeout waiting for DMA
<4>ide_dmaproc: chipset supported ide_dma_timeout func only: 14 <4>hdk: status timeout: status=0xd8 { Busy }
<4>hdk: drive not ready for command
<4>hdk: ATAPI reset complete
<4>hdk: irq timeout: status=0x80 { Busy }
<4>hdk: ATAPI reset complete
<4>hdk: irq timeout: status=0x80 { Busy }
<1>Unable to handle kernel NULL pointer dereference at virtual
address 00000184

    <4> printing eip:
    <4>e0fd22f1
    <1>*pde = 00000000
    <4>Oops: 0002
    <4>CPU:    0
    <4>EIP:    0010:[<e0fd22f1>]    Tainted: PF
    <4>EFLAGS: 00010046
    <4>eax: 00000000   ebx: 00000000   ecx: dfef8000   edx: c75bcbc0
    <4>esi: 00000080   edi: c0491938   ebp: d5908000   esp: c0435ea4
    <4>ds: 0018   es: 0018   ss: 0018
    <4>Process swapper (pid: 0, stackpage=c0435000)
    <4>Stack: c0491938 00000000 00000000 c0491938 00000088 000001f4 
c03349e2 c75bcbc0
    <4>       ce0a3b80 c0491938 00000080 00000080 c75bcbc0 c0222d6c 
00000000 c1671580
    <4>       00000080 c04918f4 c0491938 c0434000 c1671580 e0fd2550 
c0223b30 c0491938
    <4>Call Trace:    [<c0222d6c>] [<e0fd2550>] [<c0223b30>] 
[<c0223990>] [<c0127af0>]
    <4>  [<c01233d4>] [<c01232a6>] [<c01230ed>] [<c010a97f>] 
[<c010d173>] [<c0106f80>]
    <4>  [<c0106fa3>] [<c0107012>] [<c0105000>]
    <4>
    <4>Code: c7 80 84 01 00 00 00 00 07 00 75 72 9c 5e fa bb 00 e0 ff ff

From lkcd:

================================================================
STACK TRACE FOR TASK: 0xc0434000 (swapper)

0 [ide-scsi]idescsi_end_request+129 [0xe0fd22f1]
TRACE ERROR 0x800000000
================================================================

Hi

yeah i know the bug i just dont know how to fix it.
the cd drive generates an error and the item of the request Q becomes null and the idescsi_end_quest expects it to be there.

i have been able to trigger this though the whole 2.4.x tree i mail this list about every 2 version i just havnt been lucky enough to have any help with it yet. I think i might have trigger it in the 2.2.x tree as well but i didnt know very much back then either.