Something looks really bad. Can you send us your full, buildable,
source code ?
I've produced a very trimmed down module that exhibits the same
symptoms (works fine under 2..6.13, blows up on 2.6.20 and 2.6.22).
I'm becoming more convinced it has something to do with the MMU and
or how the memory is allocated throughout the system (something set
wrong in the kernel .config)
Source:
/* Kernel includes */
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/mm.h>
MODULE_LICENSE("GPL");
#include <linux/kernel.h>
#include <asm/string.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <asm/io.h>
#include <asm/uaccess.h>
static int sysmon_init(void)
{
void *memBuf;
if((void *)NULL == (memBuf = kmalloc(4096, GFP_KERNEL)))
printk (KERN_ERR "cannot malloc\n");
return 0;
}
static void sysmon_exit()
{
}
module_init (sysmon_init);
module_exit (sysmon_exit);
The Errors upon loading:
BUG: unable to handle kernel paging request at virtual address 00006b80
printing eip:
c015369c
*pde = 00000000
Oops: 0000 [#1]
PREEMPT
Modules linked in: systest
CPU: 0
EIP: 0060:[<c015369c>] Not tainted VLI
EFLAGS: 00010006 (2.6.22.1 #4)
EIP is at kmem_cache_alloc+0x21/0x56
eax: 00000000 ebx: 00000282 ecx: 00000000 edx: 00006b74
esi: d0015000 edi: d0015015 ebp: ffffffff esp: cf6eef68
ds: 007b es: 007b fs: 0000 gs: 0000 ss: 0068
Process insmod (pid: 479, ti=cf6ee000 task=ce41f080 task.ti=cf6ee000)
Stack: 00000000 00000000 d0015460 b7f2ae58 b7f4988c cf6eef9c d0015015
c0444270
000000d0 b7f4988c cf6ee000 c01220ce ffffffff cf6ee000
c01331f6 b7f30000
b7f30000 b7f30000 b7f2ae58 c0103cbe b7f30000 0000356a
0804a008 b7f2ae58
Call Trace:
[<d0015015>] sysmon_init+0x15/0x34 [systest]
[<c01220ce>] blocking_notifier_call_chain+0x17/0x1a
[<c01331f6>] sys_init_module+0x89/0x133
[<c0103cbe>] syscall_call+0x7/0xb
=======================
Code: 89 f0 83 c4 0c 5b 5e 5f 5d c3 55 57 56 53 51 51 89 c6 89 d5 8b
7c 24 18 9c 5b fa e8 9f 7a 09 00 8b 94 86 a8 00 00 00 85 d2 74 07
<8b> 42 0c 85 c0 75 17 89 54 24 04 83 c9 ff 89 ea 89 f0 89 3c 24
EIP: [<c015369c>] kmem_cache_alloc+0x21/0x56 SS:ESP 0068:cf6eef68
Sincerly,
Thomas
[1] http://lxr.free-electrons.com/source/include/asm-i386/string.h#043
--
Thomas Petazzoni - thomas.petazzoni@xxxxxxxx
http://{thomas,sos,kos}.enix.org - http://www.toulibre.org
http://www.{livret,agenda}dulibre.org
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