[ENBD] enbd module 2.6.13-15 kernel fails to modprobe or insmod

[Norbert Pieroth]

Hi all,
I'm a newbie on enbd. I want to use enbd to export a 4 TB Device via network.
I tried to build 2.4.32 on a suse 10.0 and 9.3 on different machines.
I used the standard kernel and removed the nbd kernel driver, as prescribed in
the INSTALL file.
The builds worked out (make config all and make modules), the client/
server userland binarys and kernel modules were build, but when I tried to modprobe or
insmod enbd I got a segmentation fault and a kernel stack trace.
I've read about the problem with the segmentation fault in the mailing list but I can't
get a clue how the problem was really solved.
Is there a patch available, which solves this problem ?

modprobe enbd:

Here is the message of the kernel trace:
ENBD #5348[0]: enbd_init Network Block Device originally by pavel at elf.mj.gts.cz
ENBD #5349[0]: enbd_init Network Block Device port to 2.0 by ptb at it.uc3m.es
ENBD #5351[0]: enbd_init Network Block Device move networking to user space by a
marin at it.uc3m.es
ENBD #5353[0]: enbd_init Enhanced Network Block Device 2.4.30 $Date: 2002/09/17
16:33:22 $ by ptb at it.uc3m.es
Unable to handle kernel NULL pointer dereference at virtual address 0000033e
  printing eip:
c025a0fd
*pde = 00000000
Oops: 0002 [#1]
Modules linked in: enbd nls_utf8 hfsplus vfat fat subfs speedstep_lib freq_table
  ipv6 snd_pcm_oss snd_mixer_oss snd_seq_midi button snd_seq_midi_event battery s
nd_seq ac edd snd_ens1371 gameport snd_rawmidi snd_seq_device snd_ac97_codec i2c
_piix4 i2c_core snd_pcm uhci_hcd pcnet32 snd_timer mii snd soundcore shpchp pci_
hotplug snd_page_alloc snd_ac97_bus intel_agp agpgart generic usbcore parport_pc
  lp parport dm_mod reiserfs sg fan thermal processor ide_cd cdrom BusLogic piix
sd_mod scsi_mod ide_disk ide_core
CPU:    0
EIP:    0060:[<c025a0fd>]    Tainted: G     U VLI
EFLAGS: 00010212   (2.6.13-15-default)
EIP is at blk_queue_max_sectors+0x2d/0x40
eax: 0000ce00   ebx: 00000200   ecx: 00000068   edx: 00000067
esi: cc30902c   edi: cd9fe5a0   ebp: cd9fcae0   esp: c5285c94
ds: 007b   es: 007b   ss: 0068
Process modprobe (pid: 5447, threadinfo=c5284000 task=ca17aa40)
Stack: ca1ae800 cd800140 cc30902c 00000200 cc30902c cc30902c c1842400 00000001
        4015b007 cd9fc7cc c5285dac 4015b007 00000000 c5285db0 00000000 c732996c
        cbca2e18 cb91f1b4 cbca29a0 00000002 00000001 4015b007 c9c7d080 c85d317c
Call Trace:
  [<cd800140>] init_module+0x140/0xdd1 [enbd]
  [<c014aeca>] __handle_mm_fault+0xda/0x130
  [<c0117497>] do_page_fault+0x127/0x5ef
  [<c012deb0>] autoremove_wake_function+0x0/0x30
  [<cd731bac>] do_journal_end+0x8ac/0x9b0 [reiserfs]
  [<c0142f23>] __do_page_cache_readahead+0xa3/0x120
  [<c0140af9>] buffered_rmqueue+0xb9/0x1f0
  [<c0118be7>] activate_task+0x57/0x70
  [<c016f8f0>] alloc_inode+0x150/0x1a0
  [<c0191bd0>] init_dir+0x0/0x20
  [<c0191b17>] sysfs_new_dirent+0x17/0x60
  [<c0191b70>] sysfs_make_dirent+0x10/0x70
  [<c01917aa>] sysfs_add_file+0x3a/0x60
  [<c0193140>] create_files+0x30/0x60
  [<cd9eb000>] rq_set_seqno+0x0/0x10 [enbd]
  [<c014faae>] unmap_vm_area+0x6e/0xc0
  [<c0133f27>] load_module+0x917/0xaa0
  [<c014c9f8>] __do_mmap_pgoff+0x508/0x780
  [<cd800000>] init_module+0x0/0xdd1 [enbd]
  [<c0134171>] sys_init_module+0xa1/0x180
  [<c0102d1b>] sysenter_past_esp+0x54/0x79
Code: c3 89 d0 25 ff ff 00 00 c1 e0 09 3d ff 0f 00 00 77 19 6a 08 68 71 9d 30 c0
  68 1d 88 32 c0 e8 5b 27 ec ff ba 08 00 00 00 83 c4 0c <66> 89 93 3e 01 00 00 66
  89 93 3c 01 00 00 5b c3 8d 76 00 66 85

Here is, what modinfo says about the two modules:

filename:       /tmp/enbd.ko
license:        GPL
description:    Enhanced Network Block Device 2.4.30 $Date: 2002/09/17 16:33:22 $
author:         Peter T. Breuer, Andres Marin
srcversion:     EA50B1CAEC86513D0CDB5AE
depends:
vermagic:       2.6.13-15-default 586 REGPARM gcc-4.0
parm:           rahead:int
parm:           sync:int
parm:           merge_requests:int
parm:           buf_sectors:int
parm:           show_errs:int
parm:           direct:int
parm:           buffer_writes:int
parm:           major:int
parm:           md5sum:int
parm:           md5_on_threshold:int
parm:           md5_off_threshold:int
parm:           req_timeo:int


filename:       /tmp/enbd_ioctl.ko
license:        GPL
description:    Enhanced Network Block Device Remote Ioctl
author:         Peter T. Breuer
srcversion:     11B4CBD90C1A340EE525E90
depends:        enbd
vermagic:       2.6.13-15-default 586 REGPARM gcc-4.0


If there is no patch available, what do I have to change in Version 2.4.32
to make the module work out ?



Kind regards
N.Pieroth