crypto/internal/fips140test: TestFIPS140/KTS_IFC_OAEP failures

[gopherbot]

#!watchflakes
default <- pkg == "crypto/internal/fips140test" && test == "TestFIPS140/KTS_IFC_OAEP"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestFIPS140/KTS_IFC_OAEP
    fips_test.go:279: RSA OAEP ciphertext: 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
    fips_test.go:283: RSA OAEP decrypted plaintext: 06b2614e2ef315832b23f5d0ff70294d8ddd3889527dfbe75707fe41da929325
    fips_test.go:451: Service indicator is set
==================
WARNING: DATA RACE
Write at 0x�/�0124eaca0 by goroutine 140:
  sync/atomic.SwapInt32()
      /Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/race_amd64.s:256 +0xb
  sync/atomic.SwapUint32()
...
Goroutine 141 (finished) created at:
  crypto/internal/fips140test.TestEntropyRace()
      /Users/swarming/.swarming/w/ir/x/w/goroot/src/crypto/internal/fips140test/entropy_test.go:241 +0x2c
  testing.tRunner()
      /Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1936 +0x21c
  testing.(*T).Run.gowrap1()
      /Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1999 +0x38
==================
    testing.go:1619: race detected during execution of test
--- FAIL: TestFIPS140/KTS_IFC_OAEP (0.00s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "crypto/internal/fips140test" && test == "TestFIPS140/KTS_IFC_OAEP"

2025-10-07 18:23 gotip-darwin-amd64-race go@3fc4c79f crypto/internal/fips140test.TestFIPS140/KTS_IFC_OAEP (log)

=== RUN   TestFIPS140/KTS_IFC_OAEP
    fips_test.go:279: RSA OAEP ciphertext: 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
    fips_test.go:283: RSA OAEP decrypted plaintext: 06b2614e2ef315832b23f5d0ff70294d8ddd3889527dfbe75707fe41da929325
    fips_test.go:451: Service indicator is set
==================
WARNING: DATA RACE
Write at 0x�/�0124eaca0 by goroutine 140:
  sync/atomic.SwapInt32()
      /Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/race_amd64.s:256 +0xb
  sync/atomic.SwapUint32()
...
Goroutine 141 (finished) created at:
  crypto/internal/fips140test.TestEntropyRace()
      /Users/swarming/.swarming/w/ir/x/w/goroot/src/crypto/internal/fips140test/entropy_test.go:241 +0x2c
  testing.tRunner()
      /Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1936 +0x21c
  testing.(*T).Run.gowrap1()
      /Users/swarming/.swarming/w/ir/x/w/goroot/src/testing/testing.go:1999 +0x38
==================
    testing.go:1619: race detected during execution of test
--- FAIL: TestFIPS140/KTS_IFC_OAEP (0.00s)

— watchflakes

[gopherbot]

Change https://go.dev/cl/710058 mentions this issue: crypto/internal/fips140/entropy: fix benign race