* problem with "undefined instruction"
@ 2011-04-30 16:23 Sebastian Reichel
2011-04-30 16:42 ` Santosh Shilimkar
` (2 more replies)
0 siblings, 3 replies; 9+ messages in thread
From: Sebastian Reichel @ 2011-04-30 16:23 UTC (permalink / raw)
To: linux-omap
[-- Attachment #1: Type: text/plain, Size: 1268 bytes --]
Hi,
I'm currently trying to get a mainline based kernel running on my pandaboard.
The problem is, that it's crashing very early during the init phase because of
"undefined instruction" exceptions:
[ 1.867980] udevd (56): undefined instruction: pc=401e6ed4
[ 1.874603] Code: 9cd0 fffe e92d 4ff0 (ed2d)
[ 1.977752] modprobe (69): undefined instruction: pc=400c6ed4
[ 1.977783] Code: 9cd0 fffe e92d 4ff0 (ed2d)
[ 1.978240] init (1): undefined instruction: pc=40149ed4
[ 1.978240] Code: 9cd0 fffe e92d 4ff0 (ed2d)
[ 2.005706] Kernel panic - not syncing: Attempted to kill init!
Exactly the same userland boots fine with the original 2.6.35 kernel, so it's
probably not the userland's fault. But I searched for the byte combination
anyway and found it in libc.so:
32ecc: 9cd0 ldr r4, [sp, #832] ; 0x340
32ece: fffe e92d vtbl.8 d30, {d14-d15}, d29
00032ed0 <_IO_vfprintf>:
32ed0: e92d 4ff0 stmdb sp!, {r4, r5, r6, r7, r8, r9, sl, fp, lr}
32ed4: ed2d 8b02 vpush {d8}
Can you please tell me what's missing in my kernel? I uploaded
.config and full boot messages here:
http://elektranox.org/omap-kernel/config.txt (kernel's .config)
http://elektranox.org/omap-kernel/dmesg.txt (full boot output)
-- Sebastian
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: problem with "undefined instruction"
2011-04-30 16:23 problem with "undefined instruction" Sebastian Reichel
@ 2011-04-30 16:42 ` Santosh Shilimkar
2011-04-30 16:44 ` Måns Rullgård
2011-06-06 12:56 ` Sebastian Reichel
2 siblings, 0 replies; 9+ messages in thread
From: Santosh Shilimkar @ 2011-04-30 16:42 UTC (permalink / raw)
To: Sebastian Reichel; +Cc: linux-omap
On 4/30/2011 9:53 PM, Sebastian Reichel wrote:
> Hi,
>
> I'm currently trying to get a mainline based kernel running on my pandaboard.
> The problem is, that it's crashing very early during the init phase because of
> "undefined instruction" exceptions:
>
> [ 1.867980] udevd (56): undefined instruction: pc=401e6ed4
> [ 1.874603] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> [ 1.977752] modprobe (69): undefined instruction: pc=400c6ed4
> [ 1.977783] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> [ 1.978240] init (1): undefined instruction: pc=40149ed4
> [ 1.978240] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> [ 2.005706] Kernel panic - not syncing: Attempted to kill init!
>
> Exactly the same userland boots fine with the original 2.6.35 kernel, so it's
> probably not the userland's fault. But I searched for the byte combination
> anyway and found it in libc.so:
>
> 32ecc: 9cd0 ldr r4, [sp, #832] ; 0x340
> 32ece: fffe e92d vtbl.8 d30, {d14-d15}, d29
>
> 00032ed0<_IO_vfprintf>:
> 32ed0: e92d 4ff0 stmdb sp!, {r4, r5, r6, r7, r8, r9, sl, fp, lr}
> 32ed4: ed2d 8b02 vpush {d8}
>
Looks like NEON instructions are taking an exception. Can you disable
VFP, NEON and give a one more shot.
> Can you please tell me what's missing in my kernel? I uploaded
> .config and full boot messages here:
>
Config seems to enable needed NEON/VFP options.
Regards
Santosh
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: problem with "undefined instruction"
2011-04-30 16:23 problem with "undefined instruction" Sebastian Reichel
2011-04-30 16:42 ` Santosh Shilimkar
@ 2011-04-30 16:44 ` Måns Rullgård
2011-04-30 16:57 ` Santosh Shilimkar
2011-06-06 12:56 ` Sebastian Reichel
2 siblings, 1 reply; 9+ messages in thread
From: Måns Rullgård @ 2011-04-30 16:44 UTC (permalink / raw)
To: linux-omap
Sebastian Reichel <sre@debian.org> writes:
> Hi,
>
> I'm currently trying to get a mainline based kernel running on my pandaboard.
> The problem is, that it's crashing very early during the init phase because of
> "undefined instruction" exceptions:
>
> [ 1.867980] udevd (56): undefined instruction: pc=401e6ed4
> [ 1.874603] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> [ 1.977752] modprobe (69): undefined instruction: pc=400c6ed4
> [ 1.977783] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> [ 1.978240] init (1): undefined instruction: pc=40149ed4
> [ 1.978240] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> [ 2.005706] Kernel panic - not syncing: Attempted to kill init!
>
> Exactly the same userland boots fine with the original 2.6.35 kernel, so it's
> probably not the userland's fault. But I searched for the byte combination
> anyway and found it in libc.so:
>
> 32ecc: 9cd0 ldr r4, [sp, #832] ; 0x340
> 32ece: fffe e92d vtbl.8 d30, {d14-d15}, d29
>
> 00032ed0 <_IO_vfprintf>:
> 32ed0: e92d 4ff0 stmdb sp!, {r4, r5, r6, r7, r8, r9, sl, fp, lr}
> 32ed4: ed2d 8b02 vpush {d8}
Your userland appears to be built with Thumb2. Make sure CONFIG_THUMB
is enabled in your kernel.
--
Måns Rullgård
mans@mansr.com
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: problem with "undefined instruction"
2011-04-30 16:44 ` Måns Rullgård
@ 2011-04-30 16:57 ` Santosh Shilimkar
2011-04-30 17:09 ` Måns Rullgård
0 siblings, 1 reply; 9+ messages in thread
From: Santosh Shilimkar @ 2011-04-30 16:57 UTC (permalink / raw)
To: Måns Rullgård; +Cc: linux-omap
On 4/30/2011 10:14 PM, Måns Rullgård wrote:
> Sebastian Reichel<sre@debian.org> writes:
>
[..]
>>
>> 32ecc: 9cd0 ldr r4, [sp, #832] ; 0x340
>> 32ece: fffe e92d vtbl.8 d30, {d14-d15}, d29
>>
>> 00032ed0<_IO_vfprintf>:
>> 32ed0: e92d 4ff0 stmdb sp!, {r4, r5, r6, r7, r8, r9, sl, fp, lr}
>> 32ed4: ed2d 8b02 vpush {d8}
>
> Your userland appears to be built with Thumb2. Make sure CONFIG_THUMB
> is enabled in your kernel.
>
Oh yes. The config has CONFIG_ARM_THUMB=y but THUMB2 isn't enabled.
CONFIG_THUMB2_KERNEL=y should fix the problem.
Regards
Santosh
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: problem with "undefined instruction"
2011-04-30 16:57 ` Santosh Shilimkar
@ 2011-04-30 17:09 ` Måns Rullgård
0 siblings, 0 replies; 9+ messages in thread
From: Måns Rullgård @ 2011-04-30 17:09 UTC (permalink / raw)
To: linux-omap
Santosh Shilimkar <santosh.shilimkar@ti.com> writes:
> On 4/30/2011 10:14 PM, Måns Rullgård wrote:
>> Sebastian Reichel<sre@debian.org> writes:
>>
>
> [..]
>
>>>
>>> 32ecc: 9cd0 ldr r4, [sp, #832] ; 0x340
>>> 32ece: fffe e92d vtbl.8 d30, {d14-d15}, d29
>>>
>>> 00032ed0<_IO_vfprintf>:
>>> 32ed0: e92d 4ff0 stmdb sp!, {r4, r5, r6, r7, r8, r9, sl, fp, lr}
>>> 32ed4: ed2d 8b02 vpush {d8}
>>
>> Your userland appears to be built with Thumb2. Make sure CONFIG_THUMB
>> is enabled in your kernel.
>>
> Oh yes. The config has CONFIG_ARM_THUMB=y but THUMB2 isn't enabled.
Sorry, I meant CONFIG_ARM_THUMB and that is indeed enabled. Must be
something else.
> CONFIG_THUMB2_KERNEL=y should fix the problem.
No, that builds the kernel in Thumb2 mode and you probably don't want
that.
--
Måns Rullgård
mans@mansr.com
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: problem with "undefined instruction"
2011-04-30 16:23 problem with "undefined instruction" Sebastian Reichel
2011-04-30 16:42 ` Santosh Shilimkar
2011-04-30 16:44 ` Måns Rullgård
@ 2011-06-06 12:56 ` Sebastian Reichel
2011-06-07 11:53 ` Tony Lindgren
2 siblings, 1 reply; 9+ messages in thread
From: Sebastian Reichel @ 2011-06-06 12:56 UTC (permalink / raw)
To: linux-omap
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On Sat, Apr 30, 2011 at 06:23:57PM +0200, Sebastian Reichel wrote:
> I'm currently trying to get a mainline based kernel running on my pandaboard.
> The problem is, that it's crashing very early during the init phase because of
> "undefined instruction" exceptions:
>
> [ 1.867980] udevd (56): undefined instruction: pc=401e6ed4
> [ 1.874603] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> [ 1.977752] modprobe (69): undefined instruction: pc=400c6ed4
> [ 1.977783] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> [ 1.978240] init (1): undefined instruction: pc=40149ed4
> [ 1.978240] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> [ 2.005706] Kernel panic - not syncing: Attempted to kill init!
>
> Exactly the same userland boots fine with the original 2.6.35 kernel, so it's
> probably not the userland's fault.
I found the source of this problem. VFPv3 support is not working
correctly when OMAP2 (and thus CPU_V6) is enabled in the kernel
config.
I guess this should be mentioned in the kernel config (or fixed if
possible).
-- Sebastian
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: problem with "undefined instruction"
2011-06-06 12:56 ` Sebastian Reichel
@ 2011-06-07 11:53 ` Tony Lindgren
2011-06-23 19:53 ` Sebastian Reichel
0 siblings, 1 reply; 9+ messages in thread
From: Tony Lindgren @ 2011-06-07 11:53 UTC (permalink / raw)
To: Sebastian Reichel; +Cc: linux-omap
* Sebastian Reichel <sre@debian.org> [110606 15:51]:
> On Sat, Apr 30, 2011 at 06:23:57PM +0200, Sebastian Reichel wrote:
> > I'm currently trying to get a mainline based kernel running on my pandaboard.
> > The problem is, that it's crashing very early during the init phase because of
> > "undefined instruction" exceptions:
> >
> > [ 1.867980] udevd (56): undefined instruction: pc=401e6ed4
> > [ 1.874603] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> > [ 1.977752] modprobe (69): undefined instruction: pc=400c6ed4
> > [ 1.977783] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> > [ 1.978240] init (1): undefined instruction: pc=40149ed4
> > [ 1.978240] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> > [ 2.005706] Kernel panic - not syncing: Attempted to kill init!
> >
> > Exactly the same userland boots fine with the original 2.6.35 kernel, so it's
> > probably not the userland's fault.
>
> I found the source of this problem. VFPv3 support is not working
> correctly when OMAP2 (and thus CPU_V6) is enabled in the kernel
> config.
>
> I guess this should be mentioned in the kernel config (or fixed if
> possible).
This should be easy to fix now. Do you have a minimal test program that
triggers this?
Tony
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: problem with "undefined instruction"
2011-06-07 11:53 ` Tony Lindgren
@ 2011-06-23 19:53 ` Sebastian Reichel
2011-06-27 12:12 ` Tony Lindgren
0 siblings, 1 reply; 9+ messages in thread
From: Sebastian Reichel @ 2011-06-23 19:53 UTC (permalink / raw)
To: Tony Lindgren; +Cc: linux-omap
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On Tue, Jun 07, 2011 at 02:53:31PM +0300, Tony Lindgren wrote:
> * Sebastian Reichel <sre@debian.org> [110606 15:51]:
> > On Sat, Apr 30, 2011 at 06:23:57PM +0200, Sebastian Reichel wrote:
> > > I'm currently trying to get a mainline based kernel running on my pandaboard.
> > > The problem is, that it's crashing very early during the init phase because of
> > > "undefined instruction" exceptions:
> > >
> > > [ 1.867980] udevd (56): undefined instruction: pc=401e6ed4
> > > [ 1.874603] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> > > [ 1.977752] modprobe (69): undefined instruction: pc=400c6ed4
> > > [ 1.977783] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> > > [ 1.978240] init (1): undefined instruction: pc=40149ed4
> > > [ 1.978240] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> > > [ 2.005706] Kernel panic - not syncing: Attempted to kill init!
> > >
> > > Exactly the same userland boots fine with the original 2.6.35 kernel, so it's
> > > probably not the userland's fault.
> >
> > I found the source of this problem. VFPv3 support is not working
> > correctly when OMAP2 (and thus CPU_V6) is enabled in the kernel
> > config.
> >
> > I guess this should be mentioned in the kernel config (or fixed if
> > possible).
>
> This should be easy to fix now. Do you have a minimal test program that
> triggers this?
Sorry for the delay, here is a minimal test binary, that triggers
the bug: http://elektranox.org/omap-kernel/test
-- Sebastian
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: problem with "undefined instruction"
2011-06-23 19:53 ` Sebastian Reichel
@ 2011-06-27 12:12 ` Tony Lindgren
0 siblings, 0 replies; 9+ messages in thread
From: Tony Lindgren @ 2011-06-27 12:12 UTC (permalink / raw)
To: Sebastian Reichel; +Cc: linux-omap
* Sebastian Reichel <sre@debian.org> [110623 12:49]:
> On Tue, Jun 07, 2011 at 02:53:31PM +0300, Tony Lindgren wrote:
> > * Sebastian Reichel <sre@debian.org> [110606 15:51]:
> > > On Sat, Apr 30, 2011 at 06:23:57PM +0200, Sebastian Reichel wrote:
> > > > I'm currently trying to get a mainline based kernel running on my pandaboard.
> > > > The problem is, that it's crashing very early during the init phase because of
> > > > "undefined instruction" exceptions:
> > > >
> > > > [ 1.867980] udevd (56): undefined instruction: pc=401e6ed4
> > > > [ 1.874603] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> > > > [ 1.977752] modprobe (69): undefined instruction: pc=400c6ed4
> > > > [ 1.977783] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> > > > [ 1.978240] init (1): undefined instruction: pc=40149ed4
> > > > [ 1.978240] Code: 9cd0 fffe e92d 4ff0 (ed2d)
> > > > [ 2.005706] Kernel panic - not syncing: Attempted to kill init!
> > > >
> > > > Exactly the same userland boots fine with the original 2.6.35 kernel, so it's
> > > > probably not the userland's fault.
> > >
> > > I found the source of this problem. VFPv3 support is not working
> > > correctly when OMAP2 (and thus CPU_V6) is enabled in the kernel
> > > config.
> > >
> > > I guess this should be mentioned in the kernel config (or fixed if
> > > possible).
> >
> > This should be easy to fix now. Do you have a minimal test program that
> > triggers this?
>
> Sorry for the delay, here is a minimal test binary, that triggers
> the bug: http://elektranox.org/omap-kernel/test
Heh that's pretty minimal :) I'll take a look why it fails.
Tony
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2011-06-27 12:12 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-04-30 16:23 problem with "undefined instruction" Sebastian Reichel
2011-04-30 16:42 ` Santosh Shilimkar
2011-04-30 16:44 ` Måns Rullgård
2011-04-30 16:57 ` Santosh Shilimkar
2011-04-30 17:09 ` Måns Rullgård
2011-06-06 12:56 ` Sebastian Reichel
2011-06-07 11:53 ` Tony Lindgren
2011-06-23 19:53 ` Sebastian Reichel
2011-06-27 12:12 ` Tony Lindgren
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