# X_JOB_SIM_NONDETERMINISTIC

## Means

one simulateJobs seed produced two different traces

## Typical cause

a job body reads something the simulation does not own — the wall clock, real I/O, state left by an earlier run — so a seed cannot replay

## Fix

`x test job --seed <n> --filter <the test file>` — the first differing event is printed; read the clock and ids through the frozen seams

[Testing](/error-codes#testing)