* [Xenomai] [POWERPC] bug alert with CONFIG_XENO_HW_UNLOCKED_SWITCH, >= kernel 3.4
@ 2013-06-05 10:39 Philippe Gerum
2013-06-05 11:20 ` Gilles Chanteperdrix
0 siblings, 1 reply; 3+ messages in thread
From: Philippe Gerum @ 2013-06-05 10:39 UTC (permalink / raw)
To: Xenomai@xenomai.org
A bad bug has been fixed in the unlocked context switching code for
powerpc platforms. This affects all I-pipe patches for 3.4 kernels and
above. The typical manifestation of this bug is random segmentation
faults in user-space applications (sometimes after hours under stress
load), usually the Xenomai-dependent ones.
A work around not to change the kernel code is to disable
CONFIG_XENO_HW_UNLOCKED_SWITCH. Patches for fixing this issue are
available for 3.5.7 and above:
http://git.xenomai.org/?p=ipipe.git;a=commit;h=614aa59453dacf7693fbb18229c27676c2803dbb
http://git.xenomai.org/?p=ipipe.git;a=commit;h=04ea520ab96a16ec65529a2efed92c9a4a8bda34
You might need this companion patch too:
http://git.xenomai.org/?p=ipipe.git;a=commit;h=047a21b3b203a1fbfce21284f01e376a2cf54c19
HTH,
--
Philippe.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Xenomai] [POWERPC] bug alert with CONFIG_XENO_HW_UNLOCKED_SWITCH, >= kernel 3.4
2013-06-05 10:39 [Xenomai] [POWERPC] bug alert with CONFIG_XENO_HW_UNLOCKED_SWITCH, >= kernel 3.4 Philippe Gerum
@ 2013-06-05 11:20 ` Gilles Chanteperdrix
2013-06-05 11:21 ` Gilles Chanteperdrix
0 siblings, 1 reply; 3+ messages in thread
From: Gilles Chanteperdrix @ 2013-06-05 11:20 UTC (permalink / raw)
To: Philippe Gerum; +Cc: Xenomai@xenomai.org
On 06/05/2013 12:39 PM, Philippe Gerum wrote:
>
> A bad bug has been fixed in the unlocked context switching code for
> powerpc platforms. This affects all I-pipe patches for 3.4 kernels and
> above. The typical manifestation of this bug is random segmentation
> faults in user-space applications (sometimes after hours under stress
> load), usually the Xenomai-dependent ones.
>
> A work around not to change the kernel code is to disable
> CONFIG_XENO_HW_UNLOCKED_SWITCH. Patches for fixing this issue are
> available for 3.5.7 and above:
>
> http://git.xenomai.org/?p=ipipe.git;a=commit;h=614aa59453dacf7693fbb18229c27676c2803dbb
> http://git.xenomai.org/?p=ipipe.git;a=commit;h=04ea520ab96a16ec65529a2efed92c9a4a8bda34
Well, with these patches, the whole mm switch now runs with irqs off, is
this the intended effect?
--
Gilles.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Xenomai] [POWERPC] bug alert with CONFIG_XENO_HW_UNLOCKED_SWITCH, >= kernel 3.4
2013-06-05 11:20 ` Gilles Chanteperdrix
@ 2013-06-05 11:21 ` Gilles Chanteperdrix
0 siblings, 0 replies; 3+ messages in thread
From: Gilles Chanteperdrix @ 2013-06-05 11:21 UTC (permalink / raw)
To: Philippe Gerum; +Cc: Xenomai@xenomai.org
On 06/05/2013 01:20 PM, Gilles Chanteperdrix wrote:
> On 06/05/2013 12:39 PM, Philippe Gerum wrote:
>
>>
>> A bad bug has been fixed in the unlocked context switching code for
>> powerpc platforms. This affects all I-pipe patches for 3.4 kernels and
>> above. The typical manifestation of this bug is random segmentation
>> faults in user-space applications (sometimes after hours under stress
>> load), usually the Xenomai-dependent ones.
>>
>> A work around not to change the kernel code is to disable
>> CONFIG_XENO_HW_UNLOCKED_SWITCH. Patches for fixing this issue are
>> available for 3.5.7 and above:
>>
>> http://git.xenomai.org/?p=ipipe.git;a=commit;h=614aa59453dacf7693fbb18229c27676c2803dbb
>> http://git.xenomai.org/?p=ipipe.git;a=commit;h=04ea520ab96a16ec65529a2efed92c9a4a8bda34
>
>
> Well, with these patches, the whole mm switch now runs with irqs off, is
> this the intended effect?
>
Sorry, misread the code.
--
Gilles.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2013-06-05 11:21 UTC | newest]
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2013-06-05 10:39 [Xenomai] [POWERPC] bug alert with CONFIG_XENO_HW_UNLOCKED_SWITCH, >= kernel 3.4 Philippe Gerum
2013-06-05 11:20 ` Gilles Chanteperdrix
2013-06-05 11:21 ` Gilles Chanteperdrix
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