From mboxrd@z Thu Jan 1 00:00:00 1970 From: Philippe Gerum In-Reply-To: <1302531493.2054.355.camel@domain.hid> References: <4D9F0679.7080109@domain.hid> <1302268379.2101.35.camel@domain.hid> <4DA30C80.3010107@domain.hid> <1302531493.2054.355.camel@domain.hid> Content-Type: text/plain; charset="UTF-8" Date: Mon, 11 Apr 2011 16:23:05 +0200 Message-ID: <1302531785.2054.356.camel@domain.hid> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-core] kernel threads crash List-Id: Xenomai life and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jesper Christensen Cc: xenomai@xenomai.org On Mon, 2011-04-11 at 16:18 +0200, Philippe Gerum wrote: > On Mon, 2011-04-11 at 16:13 +0200, Jesper Christensen wrote: > > I have updated to xenomai 2.5.6, but i'm still seeing exceptions > > (considerably less often though): > > > > Xenomai: suspending kernel thread b92a39d0 ('tt_upgw_0') at 0xb92a39d0 > > after exception #1792 > > You should build your code statically into the kernel, not as a module, > and find out which code raises the MCE. It's a program check exception, not a machine check, but the rest remains applicable. > > CONFIG_DEBUG_INFO=y, then objdump -dl vmlinux, looking for the NIP > mentioned. > > > > > /Jesper > > > > > > On 2011-04-08 15:12, Philippe Gerum wrote: > > > On Fri, 2011-04-08 at 14:58 +0200, Jesper Christensen wrote: > > > > > >> Hi > > >> > > >> I'm trying to implement some gateway functionality in the kernel on a > > >> emerson CPCI6200 board, but have run into some strange errors. The > > >> kernel module is made up of two threads that run every 1 ms. I have also > > >> made use of the rtpc dispatcher in rtnet to dispatch control messages > > >> from a netlink socket to the RT part of my kernel module. > > >> > > >> The problem is that when loaded the threads get suspended due to exceptions: > > >> > > >> Xenomai: suspending kernel thread b929cbc0 ('tt_upgw_0') at 0xb929cbc0 > > >> after exception #1792 > > >> > > >> or > > >> > > >> Xenomai: suspending kernel thread b929cbc0 ('tt_upgw_0') at 0x0 after > > >> exception #1025 > > >> > > >> or > > >> > > >> Xenomai: suspending kernel thread b911f518 ('rtnet-rtpc') at 0xb911f940 > > >> after exception #1792 > > >> > > >> > > >> I have ported the "gianfar" driver from linux to rtnet. > > >> > > >> The versions and hardware are listed below. The errors are most likely > > >> due to faulty software on my part, but i would like to ask if there are > > >> any known issues with the versions or hardware i'm using. I would also > > >> like to ask if there are any ways of further debugging the errors as i > > >> am not getting very far with the above messages. > > >> > > > A severe bug at kthread init was fixed in the 2.5.5.2 - 2.5.6 timeframe, > > > which would cause exactly the kind of weird behavior you are seeing > > > right now. The bug triggered random code execution due to stack memory > > > pollution at init on powerpc for Xenomai kthreads: > > > http://git.xenomai.org/?p=xenomai-rpm.git;a=commit;h=90699565cbce41f2cec193d57857bb5817efc19a > > > http://git.xenomai.org/?p=xenomai-rpm.git;a=commit;h=da20c20d4b4d892d40c657ad1d32ddb6d0ceb47c > > > http://git.xenomai.org/?p=xenomai-rpm.git;a=commit;h=a5886b354dc18f054b187b58cfbacfb60bccaf47 > > > > > > You need at the very least those three patches (from the top of my > > > head), but it would be much better to upgrade to 2.5.6. > > > > > > > > >> > > >> > > >> System info: > > >> > > >> Linux kernel: 2.6.29.6 > > >> i-pipe version: 2.7-04 > > >> processor: powerpc mpc8572 > > >> xenomai version: 2.5.3 > > >> rtnet version: 0.9.12 > > >> > > >> > > > > > > > > > _______________________________________________ > > Xenomai-core mailing list > > Xenomai-core@domain.hid > > https://mail.gna.org/listinfo/xenomai-core > -- Philippe.