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

On Sun, 2009-08-02 at 10:52 +0200, Stef Simoens wrote:

Hey Benjamin,

Thanks for the bisection. I'll have a look when I'm back from skiing :-)
In the meantime, maybe Fujita has an idea ?

Mesh is an old crappy piece of HW with an old driver full of dark
secrets that Paulus wrote eons ago, so I'd rather avoid cracking it
open :-)
 
Cheers,
Ben.

Benjamin Herrenschmidt schreef: 

quoted

On Thu, 2009-07-30 at 01:42 +0200, Stef Simoens wrote:
  

quoted

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 [off-list ref]
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
    scsi_req_map_sg.
    
    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 [off-list ref]
    Signed-off-by: James Bottomley
[off-list ref]

: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 ...
mice  
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.
-- 
Kr,
Stef Simoens
plain text document attachment (git-bisect-log)
git bisect start
# good: [8e0ee43bc2c3e19db56a4adaa9a9b04ce885cd84] Linux 2.6.29
git bisect good 8e0ee43bc2c3e19db56a4adaa9a9b04ce885cd84
# bad: [577c9c456f0e1371cbade38eaf91ae8e8a308555] Linux 2.6.30-rc1
git bisect bad 577c9c456f0e1371cbade38eaf91ae8e8a308555
# bad: [5658ae9007490c18853fbf112f1b3516f5949e62] V4L/DVB (10342): gspca - stv06xx: Add ctrl caching to the vv6410.
git bisect bad 5658ae9007490c18853fbf112f1b3516f5949e62
# good: [08abe18af1f78ee80c3c3a5ac47c3e0ae0beadf6] Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
git bisect good 08abe18af1f78ee80c3c3a5ac47c3e0ae0beadf6
# good: [6e15cf04860074ad032e88c306bea656bbdd0f22] Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2
git bisect good 6e15cf04860074ad032e88c306bea656bbdd0f22
# bad: [eedf2c5296a8dfaaf9aec1a938c1d3bd73159a30] Merge git://git.kernel.org/pub/scm/linux/kernel/git/arjan/linux-2.6-async-for-30
git bisect bad eedf2c5296a8dfaaf9aec1a938c1d3bd73159a30
# good: [0870352bc6e0dee485c86a0c99dd60e7089c8917] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6
git bisect good 0870352bc6e0dee485c86a0c99dd60e7089c8917
# good: [febb02bdfe5e2c6ceaa0a38d8b7afca3d98f415a] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
git bisect good febb02bdfe5e2c6ceaa0a38d8b7afca3d98f415a
# bad: [21283916322f579a580e413652cdefbfa3ec676f] [SCSI] zfcp: remove undefined subtype for status read response
git bisect bad 21283916322f579a580e413652cdefbfa3ec676f
# good: [6864abd8b730435d6ae9cb061095229a5a85153f] [SCSI] osd: Kconfig file for in-tree builds
git bisect good 6864abd8b730435d6ae9cb061095229a5a85153f
# bad: [b3f1f9aa082b2ab86dec4db3d8b1566af345387e] [SCSI] ses: code_set == 1 is tested twice
git bisect bad b3f1f9aa082b2ab86dec4db3d8b1566af345387e
# bad: [ea41e41588c248ee8b8162869c1e1c0565a4b3f6] [SCSI] scsi_dh_rdac: Retry for Quiescence in Progress in rdac device handler
git bisect bad ea41e41588c248ee8b8162869c1e1c0565a4b3f6
# bad: [f078727b250c2653fc9a564f15547c17ebac3f99] [SCSI] remove scsi_req_map_sg
git bisect bad f078727b250c2653fc9a564f15547c17ebac3f99
# good: [78a42ce8fb2604c459e9ebb2a4f2d546b8250111] [SCSI] osst: make all the buffer the same size
git bisect good 78a42ce8fb2604c459e9ebb2a4f2d546b8250111
# good: [26243043f207b3faa00594a33e10b2103205f27b] [SCSI] osst: replace scsi_execute_async with the block layer API
git bisect good 26243043f207b3faa00594a33e10b2103205f27b