From: Philippe Gerum <rpm@xenomai.org>
To: "Xenomai@xenomai.org" <Xenomai@xenomai.org>
Subject: [Xenomai] [POWERPC] bug alert with CONFIG_XENO_HW_UNLOCKED_SWITCH, >= kernel 3.4
Date: Wed, 05 Jun 2013 12:39:29 +0200 [thread overview]
Message-ID: <51AF1561.6090401@xenomai.org> (raw)
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.
next reply other threads:[~2013-06-05 10:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-05 10:39 Philippe Gerum [this message]
2013-06-05 11:20 ` [Xenomai] [POWERPC] bug alert with CONFIG_XENO_HW_UNLOCKED_SWITCH, >= kernel 3.4 Gilles Chanteperdrix
2013-06-05 11:21 ` Gilles Chanteperdrix
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