8321818: vmTestbase/nsk/stress/strace/strace015.java failed with 'Cannot read the array length because "<local4>" is null'

[dholmes-ora]

Please review this simple update to the strace tests that adds a check for a null entry.

Testing:

• self
• tiers 1-3 (sanity)

Thanks

---

Progress

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Issue

• JDK-8321818: vmTestbase/nsk/stress/strace/strace015.java failed with 'Cannot read the array length because "<local4>" is null' (Bug - P4)

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