[LU-511] Race condition loading modules causes mount to fail

• Type: Bug
• Resolution: Won't Fix
• Priority: Major
• Affects Version/s: Lustre 2.1.0
• Labels: patch
• Severity: 2
• Assignee: WC Triage
• Reporter: Wally Wang (Inactive)

Description

On servers with more than one OST, the module load on the initial boot intermittently fails with
the following errors:

> [2010-12-09 07:17:55][c0-0c0s1n2]lustre: gave up waiting for init of module lov.
> [2010-12-09 07:17:55][c0-0c0s1n2]lustre: Unknown symbol lov_stripe_lock
> [2010-12-09 07:18:25][c0-0c0s1n2]lustre: gave up waiting for init of module lov.
> [2010-12-09 07:18:25][c0-0c0s1n2]lustre: Unknown symbol lov_test_and_clear_async_rc
> [2010-12-09 07:18:55][c0-0c0s1n2]lustre: gave up waiting for init of module lov.
> [2010-12-09 07:18:55][c0-0c0s1n2]lustre: Unknown symbol lov_stripe_unlock

The kernel (in module.c:use_module) aborts the module load because it takes too long. Because the
lov module load is aborted, one OST fails to mount. The other OSTs mount successfully.

This is bug Oracle 24464.