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It is likely that lttng-modules needs to be updated for the exact kernel you're building for, which is usually just updating version range checks similar to this[1]. Based on your error message, I think the version range check that needs to be updated is here[2]. What's the exact version number of the kernel you're trying to build for? thanks, kienan [1]: https://github.com/lttng/lttng-modules/commit/924b0ab5ad13570c4d4a305839684b37538064d7 [2]: https://github.com/lttng/lttng-modules/blob/b1a23b9733ce6217659bc5e62961d128794a2beb/src/lttng-statedump-impl.c#L389 On 1/19/26 11:00 AM, David Aldrich via lttng-dev wrote: > Hi > > I have a build error for lttng-modules-2.14.3 on RHEL 9.6: > > lttng-modules-2.14.3/src/lttng-statedump-impl.c:408:20: error: > ‘dev_base_lock’ undeclared (first use in this function); did you mean > ‘device_lock’? > 408 | read_lock(&dev_base_lock); > | ^~~~~~~~~~~~~ > > Please can you advise me how to fix this? > > (I am only building from source because I assume lttng packages aren't > available for RHEL 9). > > Thanks in advance > David