test_src_clock_clock systematic failure

With make check:


FAIL: test_src_clock_clock
==========================

[normal]: checking that normal update has a coeff of 1.0f
[lowprecision]: checking that low precision update has a coeff near 1.0f
[drift_72]: checking that a drift of 72ms in 2h is handled
[drift_-72]: checking that a drift of -72ms in 2h is handled
[drift_864]: checking that a drift of 864ms in 24h is handled
[drift_-864]: checking that a drift of -864ms in 24h is handled
[drift_sudden]: checking that a sudden drift is handled
FAIL test_src_clock_clock (exit status: 134)

100% reproducible. No errors when running manually.

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