[LU-2262] unknown symbols when compiling lustre client without specifying --disable-server in ./configure command

• Type: Bug
• Resolution: Cannot Reproduce
• Priority: Minor
• Affects Version/s: Lustre 2.3.0
• Severity: 3
• Assignee: Minh Diep
• Reporter: Frederik Ferner (Inactive)

Description

While evaluating Lustre 2.3 for our environment, I tried to recompile the lustre client for a later version of the Red Hat kernel. With the following commands

git checkout -b b2_3 remotes/origin/b2_3
sh autogen.sh
./configure --with-linux=/usr/src/kernels/2.6.32-279.11.1.el6.x86_64

I got the warnings below during the build but the build completed.

configure: WARNING:

Disabling server because complete ext4 source does not exist.

If you are building using kernel-devel packages and require ldiskfs
server support then ensure that the matching kernel-debuginfo-common
and kernel-debuginfo-common-<arch> packages are installed.


[snip]

WARNING: /lib/modules/2.6.32-279.11.1.el6.x86_64/updates/kernel/fs/lustre/obdecho.ko needs unknown symbol echo_obd_ops
WARNING: /lib/modules/2.6.32-279.11.1.el6.x86_64/updates/kernel/fs/lustre/obdecho.ko needs unknown symbol echo_persistent_pages_fini
WARNING: /lib/modules/2.6.32-279.11.1.el6.x86_64/updates/kernel/fs/lustre/obdecho.ko needs unknown symbol echo_persistent_pages_init
WARNING: /lib/modules/2.6.32-279.11.1.el6.x86_64/updates/kernel/fs/lustre/ptlrpc.ko needs unknown symbol lut_boot_epoch_update
WARNING: /lib/modules/2.6.32-279.11.1.el6.x86_64/updates/kernel/fs/lustre/ptlrpc.ko needs unknown symbol lut_mod_exit
WARNING: /lib/modules/2.6.32-279.11.1.el6.x86_64/updates/kernel/fs/lustre/ptlrpc.ko needs unknown symbol lut_mod_init 

Trying to load the modules gave unknown symbol errors:

Nov  1 16:17:53 cs04r-sc-serv-48 kernel: Lustre: Lustre: Build Version: 2.3.0--PRISTINE-2.6.32-279.11.1.el6.x86_64
Nov  1 16:17:53 cs04r-sc-serv-48 kernel: ptlrpc: Unknown symbol lut_boot_epoch_update
Nov  1 16:17:53 cs04r-sc-serv-48 kernel: ptlrpc: Unknown symbol lut_mod_exit
Nov  1 16:17:53 cs04r-sc-serv-48 kernel: ptlrpc: Unknown symbol lut_mod_init
Nov  1 16:17:53 cs04r-sc-serv-48 modprobe: FATAL: Error inserting lustre (/lib/modules/2.6.32-279.11.1.el6.x86_64/updates/kernel/fs/lustre/lustre.ko): Unknown symbol in module, or unknown parameter (see dmesg)

compiling the same code with additional --disable-servers added to the configure options compiles without warnings and loading the module works as expected.

The same configure line without the --disable-servers option does work without problems for compiling the lustre client rpms on lustre 1.8.X