From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4DA31108.9080000@domain.hid> Date: Mon, 11 Apr 2011 16:32:40 +0200 From: Jesper Christensen MIME-Version: 1.0 References: <4D9F0679.7080109@domain.hid> <1302268379.2101.35.camel@domain.hid> <4DA30C80.3010107@domain.hid> <1302531493.2054.355.camel@domain.hid> <4DA30E14.6070401@domain.hid> <1302532049.2054.357.camel@domain.hid> In-Reply-To: <1302532049.2054.357.camel@domain.hid> Content-Type: text/plain; charset="UTF-8" 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: Philippe Gerum Cc: xenomai@xenomai.org How do i see that? /Jesper On 2011-04-11 16:27, Philippe Gerum wrote: > On Mon, 2011-04-11 at 16:20 +0200, Jesper Christensen wrote: > >> Problem is the NIP in question is the address of the thread structure as >> seen in the error message. >> > LR? > > >> /Jesper >> >> >> On 2011-04-11 16:18, 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. >>> >>> 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 >>>> >>>> >>> >>> >> >