Public bug reported:
[ Impact ]
When running autopkgtest for resource-agents in a VM testbed with a
minimal kernel (such as LXD VMs on Jammy running linux-image-kvm), the
`debian/tests/run-ocft iscsi` test fails during SETUP-AGENT with:
ERROR: Warning: Could not load preferences file /root/.targetcli/prefs.bin.
b'modprobe: FATAL: Module iscsi_target_mod not found in directory
/lib/modules/5.15.0-1109-kvm\n'
ERROR: 'SETUP-AGENT' failed, the return code is 1.
WARNING: SETUP failed, break all tests of 'iscsi'.
command13 FAIL non-zero exit status 1
Investigation into the kernel configuration of linux-kvm on Jammy (from
linux-buildinfo-*-kvm) shows:
CONFIG_TARGET_CORE=m
# CONFIG_ISCSI_TARGET is not set
The linux-kvm kernel flavour intentionally disables the LIO iSCSI target
subsystem (`# CONFIG_ISCSI_TARGET is not set`), and there are no
`iscsi_target_mod.ko` modules built for it. Furthermore, simply
installing `linux-modules-extra-*-generic` in `debian/tests/control`
does not resolve the issue, because `modprobe` cannot load generic
kernel modules into a running `linux-kvm` kernel due to version, ABI,
and module signature mismatches.
Therefore, the cleanest and most robust solution conforming to
Debian/Ubuntu autopkgtest standards is to check whether
`iscsi_target_mod` can be probed by the running kernel, and gracefully
SKIP the test when kernel support is absent. This prevents false-
positive autopkgtest regressions from blocking proposed migration for
reverse dependencies such as open-iscsi (LP: #2147499).
[ Test Plan ]
1. On a testbed running a kernel without iscsi_target_mod support (e.g. Jammy
LXD VM running linux-kvm):
Run:
sudo debian/tests/run-ocft iscsi
Expected result before fix:
Fails during setup with FATAL: Module iscsi_target_mod not found, exit
status 1.
Expected result after fix:
Outputs:
SKIP: iscsi_target_mod module is not available in running kernel
<version>
and exits 0 (clean skip / pass).
2. On a testbed running a generic kernel where iscsi_target_mod is available
(e.g. linux-image-generic):
Run:
sudo debian/tests/run-ocft iscsi
Expected result:
Module loads and ocft test -v iscsi executes and passes normally.
[ Where problems could occur ]
The fix only touches the autopkgtest test runner script
`debian/tests/run-ocft`. It does not modify any binaries, packaged agent
scripts, or runtime behavior of resource-agents itself.
The only potential risk is if a regression in the iscsi resource agent is not
caught on environments lacking kernel module support; however, on generic
environments the test will continue to execute fully as before.
[ Other Info ]
Relevant discussion in LP: #2147499 comment #24.
Tag: block-proposed-jammy
** Affects: resource-agents (Ubuntu)
Importance: Undecided
Status: New
** Tags: block-proposed-jammy
** Tags added: block-proposed-jammy
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https://bugs.launchpad.net/bugs/2170272
Title:
[SRU] resource-agents: autopkgtest iscsi fails on kernels without LIO
iSCSI target support (e.g. linux-kvm)
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