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

["Randy.Dunlap" <rddunlap@osdl.org>]

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