Re: XFS oops on loading the module

[Nathan Scott]

Hi there,

On Sat, Oct 16, 2004 at 06:50:58PM +0200, martin f krafft wrote:
> I just tried to mount an XFS filesystem on this AMD K6 machine,
> booted with the 2.6.8 kernel for FAI
> (http://www.informatik.uni/koeln.de/fai) (let me know if you need
> any information about it), and modprobe segfaults with a kernel bug.
> Have you seen this before? Thanks!
> 
> sh-2.05b# modprobe xfs
> Segmentation fault
> ------------[ cut here ]------------
> kernel BUG at kernel/module.c:264!

IOW... this, I guess:

        for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
                /* Extra for alignment requirement. */
                extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
                BUG_ON(i == 0 && extra != 0);

> Modules linked in: ext3 jbd mbcache sr_mod sd_mod scsi_mod ide_generic usbmouse usbhid ide_cd cdrom usbkbd floppy rtc via82cxxx slc90e66 sis5513 siimage serverworks rz1000 piix pdc202xx_old pdc202xx_new hpt366 ide_disk hpt34x cs5530 cmd64x amd74xx alim15x3 aec62xx ide_core uhci_hcd usbcore
> CPU:    0
> EIP:    0060:[<c012bcf6>]    Not tainted
> EFLAGS: 00010202   (2.6.8-fai) 
> EIP is at percpu_modalloc+0xe/0xf8
> eax: 0000004b   ebx: e09f9400   ecx: e09f940c   edx: 0000000f
> esi: e09f84c4   edi: 00000258   ebp: e09fa9c8   esp: d9963f0c
> ds: 007b   es: 007b   ss: 0068
> Process modprobe (pid: 1272, threadinfo=d9962000 task=dfb50650)
> Stack: e09f9400 e09f84c4 00000258 e09fa9c8 c012d8be e098f000 c012d8ed 00000148 
>        00000020 40157000 080509b8 c031f504 d9962000 c416c0a0 00000044 00000060 
>        df0ad4e0 00000000 00000000 e09f9400 0000000f 00000000 00000000 00000000 
> Call Trace:
>  [<c012d8be>] load_module+0x3c6/0x904
>  [<c012d8ed>] load_module+0x3f5/0x904
>  [<c012de59>] sys_init_module+0x5d/0x200
>  [<c0105d5f>] syscall_call+0x7/0xb
> Code: 0f 0b 08 01 6f a5 2b c0 89 f6 bd a0 10 40 c0 31 f6 a1 2c 64 
> 

I haven't come across this before - the only percpu variables
in XFS are the performance stats.  I've CC'd a couple of people
who may have more of a clue as to whats gone wrong here.

cheers.

-- 
Nathan
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