From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4DA30E14.6070401@domain.hid> Date: Mon, 11 Apr 2011 16:20:04 +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> In-Reply-To: <1302531493.2054.355.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 Problem is the NIP in question is the address of the thread structure as seen in the error message. /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 >> >