[Unionfs] Can't mount NFS-exported union anymore in unionfs-1.4

[Wilhelm Meier]

Am Montag, 27. November 2006 14:12 schrieb hooanon05 at yahoo.co.jp:
> Wilhelm Meier:
> > Just to double-check: I'm using the attached patchfile (copied from your
> > post). Is it the right file?
> >
> > Can you please send yout a.patch file you used for your last post,
> > please?
>
> Tabs are replaced by spaces. I guess that is the cause of this trouble.
> My a.patch is a mail itself I sent.
> If you cannot retrieve it from the unionfs mail archive, I will send you
> after mime encoding.

Yes. that's it. Now the patchfile is o.k.! I'm very sorry about the hassle. 
Please apologize!

But the result remains unchanged

gs ~ # mount -t unionfs none /tftproot/gentoo_B -o 
imap=/tftproot/gbf.map:/tftproot/gbro.map,dirs=/tftproot/gentoo_Bdiff=rw:/tftproot/gentoo_A=ro               

Then I get the oops:

Registering unionfs 1.4
unionfs: debugging is not enabled
BUG: unable to handle kernel NULL pointer dereference at virtual address 
00000008
 printing eip:
d0a0bf60
*pde = 00000000
Oops: 0000 [#1]
SMP
Modules linked in: unionfs nfsd exportfs floppy parport_pc parport pcspkr 
pcnet32 mii mptspi mptscsih mptbase scsi_transport_spi rtc nfs lockd sunrpc 
raid10 raid1 raid0 dm_mirror dm_mod pdc_adma sata_mv ata_piix ahci sata_qstor 
sata_vsc sata_uli sata_sis sata_sx4 sata_nv sata_via sata_svw sata_sil24 
sata_sil sata_promise libata sbp2 ohci1394 ieee1394 sl811_hcd ohci_hcd 
uhci_hcd usb_storage usbhid ehci_hcd usbcore
CPU:    0
EIP:    0060:[<d0a0bf60>]    Not tainted VLI
EFLAGS: 00010246   (2.6.18-gentoo-r1 #3)
EIP is at read_uin+0x60/0x150 [unionfs]
eax: 00000000   ebx: 00000000   ecx: 00000000   edx: 0006800d
esi: ce909dc0   edi: ce725ca8   ebp: cf1e124c   esp: ce725c50
ds: 007b   es: 007b   ss: 0068
Process mount (pid: 10642, ti=ce725000 task=cfeb9000 task.ti=ce725000)
Stack: c014fa78 00000000 00000000 00000010 00340098 00000000 ce7db400 00000000
       ceb869e0 00000001 d0a047f7 cf1e1200 00000000 0006800d 00000040 ce725ca8
       00000000 00000286 00000008 ce7dad94 d0a0b135 00000008 00000000 00000002
Call Trace:
 [<c014fa78>] cache_alloc_refill+0x2ac/0x431
 [<d0a047f7>] unionfs_interpose+0x97/0x480 [unionfs]
 [<d0a0b135>] new_dentry_private_data+0x125/0x1c0 [unionfs]
 [<d0a05809>] unionfs_read_super+0xb89/0xe13 [unionfs]
 [<c0111c0d>] default_wake_function+0x0/0x15
 [<c01d7c36>] idr_get_new_above_int+0x123/0x1fb
 [<c01d7d1d>] idr_get_new+0xf/0x30
 [<c016895c>] get_filesystem+0x12/0x31
 [<c0157b9b>] sget+0x2ac/0x2b6
 [<c015838d>] get_sb_nodev+0x4e/0x91
 [<d0a04c80>] unionfs_read_super+0x0/0xe13 [unionfs]
 [<c0157db9>] vfs_kern_mount+0x35/0x66
 [<d0a04c80>] unionfs_read_super+0x0/0xe13 [unionfs]
 [<c0157e27>] do_kern_mount+0x29/0x39
 [<c016a0c0>] do_mount+0x5cf/0x647
 [<c0169348>] mntput_no_expire+0x14/0x67
 [<c015f712>] link_path_walk+0xa8/0xb3
 [<c013bfc8>] filemap_nopage+0xbf/0x31b
 [<c013c0a8>] filemap_nopage+0x19f/0x31b
 [<c01447b7>] __handle_mm_fault+0x3ff/0x756
 [<c01492f6>] page_add_file_rmap+0x17/0x1a
 [<c0144599>] __handle_mm_fault+0x1e1/0x756
 [<c015e7f0>] putname+0x2d/0x30
 [<c013d942>] get_page_from_freelist+0x9f/0x356
 [<c013de8e>] __get_free_pages+0x29/0x2e
 [<c0168fdd>] copy_mount_options+0x28/0x10b
 [<c016a1b0>] sys_mount+0x78/0xb1
 [<c010284d>] sysenter_past_esp+0x56/0x79
Code: e8 e8 51 27 8c ef 8b 54 24 34 89 5c 24 04 8b 46 48 8b 1c 98 8d 04 d5 30 
00 00 00 89 44 24 10 31 c0 89 44 24 14 c7 07 00 00 00 00 <8b> 43 08 8b 54 24 
10 8b 4c 24 14 8b 40 0c 83 c2 08 83 d1 00 3b
EIP: [<d0a0bf60>] read_uin+0x60/0x150 [unionfs] SS:ESP 0068:ce725c50
gs ~ #                                

>
> Junjiro Okajima

-- 
Wilhelm Meier
email: wilhelm.meier at fh-kl.de