Re: [Scst-devel] iscsi_scst: Unknown symbol backport_dependency_symbol

[Bart V. A. <bva...@ac...>]

On 07/17/18 02:54, Carsten Aulbert wrote:
> on our voyage from FibreChannel via iSCSI over TCP/IP we are currently
> testing Infiniband and gravitated to another problem.
> 
> On a recent Debian Stretch (9.5) box with kernel
> 
> Linux fc1 4.9.0-7-amd64 #1 SMP Debian 4.9.110-1 (2018-07-05) x86_64
> GNU/Linux
> 
> We first tried the old in-kernel Mellanox drivers with scst. It sort of
> worked, but a couple of panics due to missing contiguous memory stopped
> that attempt[1].
> 
> Then, we tried Mellanox' OFED version both 4.3 and 4.4 (only ones
> supporting Debian 9's 4.9 kernel) with the released 3.2 version but
> apparently Mellanox file layout changed enough forcing us to go to scst
> 3.3.x or svn-trunk (revision 7425 which is what threw the error below).
> 
> Installing MLNX_OFED_LINUX-4.4-1.0.0.0-debian9.1-x86_64.tgz via
> ./mlnxofedinstall --skip-distro-check --force worked nicely, compiling
> and installing scst/iscsi/scstadmin afterwards as well.
> 
> However, when trying to load iscsi-scst it fails with
> 
> modprobe: ERROR: could not insert 'iscsi_scst': Invalid argument
> 
> or via dmesg:
> 
> [ 8332.096497] iscsi_scst: no symbol version for backport_dependency_symbol
> [ 8332.097763] iscsi_scst: Unknown symbol backport_dependency_symbol
> (err -22)
> 
> and I have no clue how to proceed here and thankful for any hints.

Hello Carsten,

MOFED is most useful for people who have a support contract with
Mellanox. If you don't have such a support contract I recommend to build
and run SCST against an upstream Linux kernel. Is the kernel version
that you mentioned in your e-mail a vanilla kernel (from kernel.org) or
a Debian kernel (that means, a kernel that includes Debian patches)? In
the latter case, there may be an issue with one of the Debian IB
patches. Have you tried to install a vanilla kernel and to build and run
SCST against that kernel? Binary images of vanilla kernels are available
in the Debian testing and unstable repositories, e.g. package
linux-image-4.17.0-1.

Bart.