kern/140036: [iwn] [lor] lock order reversal with iwn0_com_lock and iwn0 softc lock

[Glen Barber]

Hi,

On Mon, Nov 23, 2009 at 9:30 PM, Benjamin Kaduk <kaduk at mit.edu> >  >
On Sun, 22 Nov 2009, Bernhard Schmidt wrote:
>  >>
>  >> Can you verify that the LOR is gone with the latest checkout of my
>  >> repository?
>  >> Compile instructions:
>  >> http://forums.freebsd.org/showpost.php?p=47627&postcount=16
>  >
>  > I upgraded to today's current (which picked up a number of probably-unrelated
>  > changes), and then installed the driver from
>  > your tree on top of it.
>  > No LOR on boot, and I'll let you know if I see any lockups.

I am seeing this LOR on 8-STABLE (with the latest iwn(4) patches from
the site above).

>
>
>  I got a "lockup" (no idea what actually was happening) while in X tonight;
>  nothing useful is in the logs.

Do you mean "lockup" as in the system becomes non-responsive?  If so,
I am experiencing this as well.

I recently switched my filesystem to ZFS because of the time fsck_ufs
takes, and added the following options to GENERIC to try to track this
down:

KDB
DDB
BREAK_TO_DEBUGGER
ALT_BREAK_TO_DEBUGGER
INVARIANTS
INVARIANT_SUPPORT
WITNESS
WITNESS_SKIPSPIN
SOCKBUF_DEBUG
DIAGNOSTIC
SW_WATCHDOG
DEBUG_VFS_LOCKS


>  I'm not even sure if I can blame iwn for it ...

The last time the system locked, I wasn't in X.  I saw the following
on the console before it became unusable:


firmware error log:
error type      = "SYSASSERT" (0x00000005)
program counter = 0x0000C920
source line     = 0x00000619
error data      = 0x000000FE00000000
branch link     = 0x0000C8420000C842
interrupt link  = 0x0000090E00000000
time            = 1182627
driver status:
tx ring  0: qid=0  cur=1   queued=1
tx ring  1: qid=1  cur=0   queued=0
tx ring  2: qid=2  cur=0   queued=0
tx ring  3: qid=3  cur=0   queued=0
tx ring  4: qid=4  cur=12  queued=0
tx ring  5: qid=5  cur=0   queued=0
tx ring  6: qid=6  cur=0   queued=0
tx ring  7: qid=7  cur=0   queued=0
tx ring  8: qid=8  cur=0   queued=0
tx ring  9: qid=9  cur=0   queued=0
tx ring 10: qid=10 cur=0   queued=0
tx ring 11: qid=11 cur=0   queued=0
tx ring 12: qid=12 cur=0   queued=0
tx ring 13: qid=13 cur=0   queued=0
tx ring 14: qid=14 cur=0   queued=0
tx ring 15: qid=15 cur=0   queued=0
tx ring 16: qid=16 cur=0   queued=0
tx ring 17: qid=17 cur=0   queued=0
tx ring 18: qid=18 cur=0   queued=0
tx ring 19: qid=19 cur=0   queued=0
rx ring: cur=59
iwn0: iwn_apm_stop_master: timeout waiting for master

If there is more information I can provide, please let me know.


-- 
Glen Barber