BUG in dma-mapping.h:218 // MESH SCSI driver not working

Stef Simoens stef.simoens at scarlet.be
Sun Aug 2 18:52:55 EST 2009

Hey Benjamin,

Benjamin Herrenschmidt schreef:
> On Thu, 2009-07-30 at 01:42 +0200, Stef Simoens wrote:
>> What would be the best approach?
>> - if the kernel boots, it's obviously 'good'
>> - but what if the kernel hits the 'BUG', should I apply your patch
>> then? If it doesn't work with your patch, would it be 'bad' then? 
A few reboots later...
As you said, during my bisecting, at a certain moment I needed your 
patch (I booted, got a problem, patched the tree with your patch, 
rebooted, it worked).

Then, git says:
f078727b250c2653fc9a564f15547c17ebac3f99 is first bad commit
commit f078727b250c2653fc9a564f15547c17ebac3f99
Author: FUJITA Tomonori <fujita.tomonori at lab.ntt.co.jp>
Date:   Sun Dec 14 01:23:45 2008 +0900

    [SCSI] remove scsi_req_map_sg
    No one uses scsi_execute_async with data transfer now. We can remove
    Only scsi_eh_lock_door uses scsi_execute_async. scsi_eh_lock_door
    doesn't handle sense and the callback. So we can remove
    scsi_io_context too.
    Signed-off-by: FUJITA Tomonori <fujita.tomonori at lab.ntt.co.jp>
    Signed-off-by: James Bottomley <James.Bottomley at HansenPartnership.com>

:040000 040000 c4621d866c1ee5fd8d30e44f702a4966b8ebdc44 
3ffca800399e52ef12f1001721c0c7ff431efafd M    drivers
:040000 040000 805c02c4ad3c63c45dffa18f413e92bfca99caf6 
6fb58bb5fb19c4198fa7d626d6241086655c6307 M    include

At this moment, the reason for the crash is different then in v2.6.30
I noted the following (I hope to have written the most important stuff).
driver 'sd' needs update
mesh: lost arbitration 
sd 0:0:0:0 sda read CAPACITY failed
sd ...
sd 0:0:0:0 sdb read CAPACITY failed
sd ...
sd ...
mice: PS/2 ...
TCP cubic ...
Initializing XFRM ...
NET ... protcol 17  
XFS ...
VFS : unable to mount root FS

If you want more input ... please let me know.

Stef Simoens

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