FADIAB test on Derecho GNU failure due to use-before-initialize dbuf3 in se/dyn_comp.F90::read_inidat

[jimmielin]

What happened?

SMS_Ln9.ne3pg3_ne3pg3_mg37.FADIAB.derecho_gnu.cam-outfrq_se_cslam has been failing for a while.

What are the steps to reproduce the bug?

Run the Derecho GNU regression tests or this test individually SMS_Ln9.ne3pg3_ne3pg3_mg37.FADIAB.derecho_gnu.cam-outfrq_se_cslam.

What CAM-SIMA hash were you using?

sima0_15_000

What machine were you running CAM-SIMA on?

CISL machine (e.g. cheyenne)

What compiler were you using?

GNU

Path to a case directory, if applicable

No response

Will you be addressing this bug yourself?

No

Extra info

shr_reprosum_calc call crashes due to commented out cnst_init_default (constituent default value initialization) in src/dynamics/se/dyn_comp.F90

adding initialization for dbuf3 will fix the runtime crash

         ! Constituent not found in IC file (or se_read_trace disabled):
         ! initialize the read buffer so that the minimum-value clamp below
         ! yields a well-defined value (const_qmin) instead of reading
         ! uninitialized memory.
         ! TODO: replace with constituent default-value initialization once
         ! that infrastructure is available (see commented-out call below,
         ! inherited from CAM):
         !call cnst_init_default(m_cnst, latvals, lonvals, dbuf3, pmask)
         dbuf3 = 0.0_r8
         if (par%masterproc) then
            write(iulog,*) subname//': constituent "', trim(const_name(m_cnst)), &
                 '" not found in IC file; initializing to minimum value'
         end if

investigated by claude-fable-5[1m]

I think #344 will fix this, but I opened this issue to be sure we know about the root cause of the current failure in case it is not addressed after #344 is merged.