[Scst-devel] iscsi_scst: Unknown symbol backport_dependency_symbol

[Carsten A. <car...@ae...>]

Hi again,

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.

Cheers

Carsten

PS: While browsing the docs/list archive I also found 'make dpkg' which
seems to work nicely, thank you for that option! Obviously, it also
fails with same error.

[1] as soon as the initiator tried to access the target, a kernel dump
appeared - unfortunately I don't have a full record handy at the moment.
We tried different settings for the kernel, e.g.  swiotlb=1024 or force
or 8192 but to no avail. iscsi-scst tried to allocate about 4MB but
seemingly there was not enough room. I can trigger this one again if needed.

-- 
Dr. Carsten Aulbert, Max Planck Institute for Gravitational Physics,
Callinstraße 38, 30167 Hannover, Germany
Phone: +49 511 762 17185