Currently, CCTK_HasAccess only checks access if presync_mode is set to presync_only. However, with debug on (CCTK_DEBUG is defined), it instead always checks access.

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The first part of this code section asserts that the function has the attribute RDWR:

  assert(current_function->RDWR);

This is incompatible with the form of CCTKi_CreateRDWRData, which immediately returns if this parameter is set to off, meaning that this attribute is never created. As such, presync_mode="off" cannot run in debug mode, which is especially unacceptable for the default parameter setting. If presync is completely off, then it should never enter this section of the code.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2781/fix-bug-in-debug-mode-with-presync_mode