Re: Panic on boot during scan with pmspcv

[John Baldwin]

On Tuesday, August 25, 2015 02:27:42 PM Conrad Meyer wrote:
> For some reason, it only crops up on UEFI boot. "Legacy" boot "just works."
> 
> It looks like we're locking a mutex in a struct at NULL.
> 
> (trap)
> __mtx_assert+0xdb
> agtiapi_cam_action+0x45
> xpt_action_default+0xbe3(?)
> scsi_scan_bus+0x1cd
> xpt_scanner_thread+0x15c
> ...
> 
> 
> Fault is at 0x18.
> 
> http://i.imgur.com/615PC6b.jpg
> 
> (kgdb) l *(agtiapi_cam_action+0x45)
> 0x806d4ef5 is in agtiapi_cam_action
> (/usr/src/sys/dev/pms/freebsd/driver/ini/src/agtiapi.c:1818).
> 
> Possibly here?
> 
> 1814   mtx_assert( &(pmcsc->pCardInfo->pmIOLock), MA_OWNED );

Probably pCardInfo is NULL.

Looking at the pms driver source is making my stomach churn, but I don't
see anything obvious.  The field is set during attach, so it shouldn't be
NULL when the intrhook runs.  Do you have any other storage devices on
this box?  If so, I would try to kldload the pms driver after you have
booted far enough to setup dumps (either that or setup remote kgdb).

-- 
John Baldwin
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Re: Panic on boot during scan with pmspcv

[Garrett Cooper]

> On Sep 1, 2015, at 13:30, Conrad Meyer  wrote:
> 
>> On Mon, Aug 31, 2015 at 6:20 PM, John Baldwin  wrote:
>> Probably pCardInfo is NULL.
>> 
>> Looking at the pms driver source is making my stomach churn, but I don't
>> see anything obvious.  The field is set during attach, so it shouldn't be
>> NULL when the intrhook runs.  Do you have any other storage devices on
>> this box?  If so, I would try to kldload the pms driver after you have
>> booted far enough to setup dumps (either that or setup remote kgdb).
> 
> In fact, I don't have any storage devices attached to the PMC
> controller on this box. So it's a pretty low priority for me other
> than not panicing. I've configured the BIOS to legacy boot and the
> issue no longer crops up.
> 
> I just wanted to register the stack and unpleasantness on -CURRENT@ in
> case someone else runs into it too and/or PMC is reading and can
> diagnose/fix it.

If you see something, bug it :)!
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Re: Panic on boot during scan with pmspcv

[Conrad Meyer]

On Mon, Aug 31, 2015 at 6:20 PM, John Baldwin  wrote:
> Probably pCardInfo is NULL.
>
> Looking at the pms driver source is making my stomach churn, but I don't
> see anything obvious.  The field is set during attach, so it shouldn't be
> NULL when the intrhook runs.  Do you have any other storage devices on
> this box?  If so, I would try to kldload the pms driver after you have
> booted far enough to setup dumps (either that or setup remote kgdb).
>

In fact, I don't have any storage devices attached to the PMC
controller on this box. So it's a pretty low priority for me other
than not panicing. I've configured the BIOS to legacy boot and the
issue no longer crops up.

I just wanted to register the stack and unpleasantness on -CURRENT@ in
case someone else runs into it too and/or PMC is reading and can
diagnose/fix it.

Best,
Conrad
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Panic on boot during scan with pmspcv

[Conrad Meyer]

For some reason, it only crops up on UEFI boot. Legacy boot just works.

It looks like we're locking a mutex in a struct at NULL.

(trap)
__mtx_assert+0xdb
agtiapi_cam_action+0x45
xpt_action_default+0xbe3(?)
scsi_scan_bus+0x1cd
xpt_scanner_thread+0x15c
...


Fault is at 0x18.

http://i.imgur.com/615PC6b.jpg

(kgdb) l *(agtiapi_cam_action+0x45)
0x806d4ef5 is in agtiapi_cam_action
(/usr/src/sys/dev/pms/freebsd/driver/ini/src/agtiapi.c:1818).

Possibly here?

1814   mtx_assert( (pmcsc-pCardInfo-pmIOLock), MA_OWNED );

Best,
Conrad
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