Backport of template: protect use of template manager with a lock into release/1.3.x #15200
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This PR protects access to `templateHook.templateManager` with its lock. So far we have not been able to reproduce the panic - but it seems either Poststart is running without a Prestart being run first (should be impossible), or the Update hook is running concurrently with Poststart, nil-ing out the templateManager in a race with Poststart. Fixes #15189
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Backport
This PR is auto-generated from #15192 to be assessed for backporting due to the inclusion of the label backport/1.3.x.
WARNING automatic cherry-pick of commits failed. Commits will require human attention.
The below text is copied from the body of the original PR.
This PR protects access to
templateHook.templateManagerwith its lock. Sofar we have not been able to reproduce the panic - but it seems either Poststart
is running without a Prestart being run first (should be impossible), or the
Update hook is running concurrently with Poststart, nil-ing out the templateManager
in a race with Poststart.
Fixes #15189
Backport only to 1.4.x and 1.3.x