Hi Bruce,
On 8/3/07, Bruce Rowen <browen@xxxxxxxxxxxx> wrote:
> >
> > 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)
I tried your code with 2.6.23-rc1 and it works without any problems.
Looks like something wrong with your MMU :(.
Its a perfectly harmless module.
Try sending your crash log and .config to LKML. May be some help ...
Thanks
--psr
>
> 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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> >
>
>
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>
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