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Subject: Re: OOPS in idescsi_end_request
From: James Stevenson <james@stev.org>
To: Brian King <brking@charter.net>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <3E2E12D7.4060707@charter.net>
References: <3E2E12D7.4060707@charter.net>
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Date: 22 Jan 2003 21:49:17 +0000
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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.


On Wed, 2003-01-22 at 03:41, Brian King wrote:
> 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
> ================================================================
> 
> 
> 
> -
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