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Intermittent error in mww3_test_05/work_ST6_PR2_UQ_OMP on Cray GNU #1628

Description

@ukmo-daisybrown

Describe the bug
An error seems to occur when running ww3_multi in the mww3_test_05/./work_ST6_PR2_UQ_OMP regression test at current head of develop (761cf79) on our UKMO Cray GNU. I had not experienced this when running this on older commits e.g (c3b0d04)

To Reproduce
Run the mww3_test_05 regression test and check output logs

Expected behavior
The test to successfully produce ´files for ww3.68060600, ww3.68060601, ww3.68060602, ww3.68060603, ww3.68060604, ww3.68060605, ww3.68060606

Screenshots
Here's a comparison of the ww3_multi.out between a test working as expected (left) and one with the error seen (right):

Image

Additional context
I observed this problem when running regression tests for #1613. Counterintuitively, running on the head of that branch (d71f926) did not cause the issue to appear but running on head of develop as above did - despite the only code difference being a change to NetCDF metadata defaults. This was repeated upon retesting, hence I consider it an intermittent issue.

As above, this is the first time I recall encountering the error.

I apologise in advance that I am not familiar with the particularly regression test and I have not dug into investigating the bug particularly deeply but I'll be happy to provide any further info or clarifying context.

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