Re: Crash when loading a module (without executing any code of the module!)

["Michael Tasche" <michael.tasche@web.de>]

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Hi, 

On Fri, 2 Jul 2004 08:49:15 -0700, Randy.Dunlap <rddunlap@osdl.org> wrote:

> On Fri, 2 Jul 2004 17:15:29 +0200 Michael Tasche wrote:
>
> | Hi,
> |
> | attached you will find the .configs of the two kernel-trees.
>
> Not.  and there was a part 2 of the request also:
>
> | >Can you post the module source code, or a subset of it that causes
> | >the problem?
>
> My modules load OK, so without some broken source code, it's
> gonna be tough.

we are just preparing a down stripped driver source for you.

Well, we do not think to solve the problem with the source, because the the crash occurs, before any of our source-code is executed.

Again the problem:  If our linux indepedant firmware-loader object is generated with "kbuild" on the other kernel-tree, we get the crash, if we build both objects against the same kernel-tree, everything works fine.

I have attached the .configs again, sorry my fault. 

- Michael

>
>
> | -Michael
> |
> | On Wed, 30 Jun 2004 14:29:48 -0700, Randy.Dunlap <rddunlap@osdl.org>  
> wrote:
> | >
> | >Hi-
> | >
> | >On Wed, 30 Jun 2004 15:41:27 +0200 Michael Tasche wrote:
> | >| Hi,
> | >| currently I'm developping a small kernel module for a hardware  
> (which was developped by a friend of mine), which is
> | >| supposed to load a firmware onto a PCI-card.
> | >|
> | >| The development is done together with the friend, who's developping  
> the firmware.
> | >| We tried the following:
> | >| He compiled a kernel-independent object (containing the firmware)  
> on his system using kbuild
> | >| (Dual-AthlonMP, SuSE 8.2 with kernel.org-kernel 2.6.3,  
> module-init-tools 0.9.14-pre2, gcc 3.3.1,
> | >| ld 2.14.90.0.5 20030722).
> | >| Afterwards I tried to link it to my kernel-module (using the same  
> kbuild makefile with
> | >| firmware.o_shipped) on my machine (Fedora2, 2.6.5-3.1smp,  
> module-init-tools 3.0-pre10, gcc 3.3.3, ld 2.15.90.0.3
> | >| 20040415).
> | >|
> | >| This is what happened:
> | >|
> | >| Unable to handle kernel paging request at virtual address 82d90700
> | >|  printing eip:
> | >| 02135657
> | >| *pde = 00000000
> | >| Oops: 0002 [#1]
> | >| PREEMPT SMP
> | >| CPU:    1
> | >| EIP:    0060:[<02135657>]    Not tainted
> | >| EFLAGS: 00010246   (2.6.5-3.1smp)
> | >| EIP is at module_unload_init+0xa/0x4d
> | >| eax: 82d90700   ebx: 82c2387c   ecx: 82d8f600   edx: 00000000
> | >| esi: 82c38f33   edi: 82c40027   ebp: 000005f0   esp: 763c3f38
> | >| ds: 007b   es: 007b   ss: 0068
> | >| Process insmod (pid: 1812, threadinfo=763c2000 task=7f3c60b0)
> | >| Stack: 02136dc0 7864cc40 8282a000 00000000 82d8f600 00000000  
> 00000000 00000000
> | >|        00000000 00000000 0000000b 00000000 00000010 00000000  
> 00000000 00000009
> | >|        00000025 00000024 00000026 82c3829c 82c23727 82a94000  
> 0856a008 763c3fc4
> | >| Call Trace:
> | >|  [<02136dc0>] load_module+0x53e/0x7fa
> | >|  [<021370da>] sys_init_module+0x5e/0x293
> | >|
> | >| Code: 89 81 00 11 00 00 89 81 04 11 00 00 89 c8 c7 80 00 01 00 00
> | >
> | >Some of those stack addresses look odd to me.
> | >Please send me your kernel .config file.
> | >
> | >| What puzzles me, is that I don't see any of my code in the  
> calltrace. I had a look into the
> | >| kernel-code and it seems to crash, before it even jumps into my  
> code. What am I missing?
> | >| By the way, everything works fine, if I compile the entire module  
> on my machine.
> | >| Some more testing showed, that we do also expierence a crash, if we  
> do everything vice-versa.
> | >|
> | >| Regards,
> | >| Michael
> | >|
> | >| P.S: This was also posted by the driver developer to  
> comp.os.linux.development.system.
> | >
> | >Can you post the module source code, or a subset of it that causes
> | >the problem?
> | >
> | >--
>
>
> --
> ~Randy
> -
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