runtime: TestAppendByteCapInLoop failures

[gopherbot]

#!watchflakes
default <- pkg ~ `^runtime(:cpu\d)?$` && test == "TestAppendByteCapInLoop"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "runtime" && test == "TestAppendByteCapInLoop"

2025-11-20 17:19 gotip-linux-amd64-asan-clang15 go@32f5aadd runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-20 17:19 gotip-linux-amd64-msan-clang15 go@32f5aadd runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-20 17:19 gotip-linux-arm64-asan-clang15 go@32f5aadd runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 01:47 gotip-linux-amd64-asan-clang15 go@4d26d66a runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 01:47 gotip-linux-amd64-msan-clang15 go@4d26d66a runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 01:47 gotip-linux-arm64-asan-clang15 go@4d26d66a runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 01:48 gotip-linux-amd64-asan-clang15 go@74ebdd28 runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 01:48 gotip-linux-amd64-msan-clang15 go@74ebdd28 runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 01:48 gotip-linux-arm64-asan-clang15 go@74ebdd28 runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 19:07 gotip-linux-amd64-asan-clang15 go@d3a0321d runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 19:07 gotip-linux-amd64-msan-clang15 go@d3a0321d runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 19:07 gotip-linux-arm64-asan-clang15 go@d3a0321d runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 19:31 gotip-linux-amd64-asan-clang15 go@3fdd183a runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 19:31 gotip-linux-amd64-msan-clang15 go@3fdd183a runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 19:31 gotip-linux-arm64-asan-clang15 go@3fdd183a runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 21:14 gotip-linux-amd64-asan-clang15 go@da92168e runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 21:14 gotip-linux-amd64-msan-clang15 go@da92168e runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-21 21:14 gotip-linux-arm64-asan-clang15 go@da92168e runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-24 15:54 gotip-linux-amd64-asan-clang15 go@0c69e773 runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-24 15:54 gotip-linux-amd64-msan-clang15 go@0c69e773 runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

2025-11-24 15:54 gotip-linux-arm64-asan-clang15 go@0c69e773 runtime.TestAppendByteCapInLoop (log)

=== RUN   TestAppendByteCapInLoop
    slice_test.go:656: for size 9, got 2.000000 allocs want 1
    slice_test.go:656: for size 16, got 2.000000 allocs want 1
    slice_test.go:656: for size 17, got 3.000000 allocs want 1
    slice_test.go:659: for size 17, got capacity 32 want 24
    slice_test.go:656: for size 24, got 3.000000 allocs want 1
    slice_test.go:659: for size 24, got capacity 32 want 24
    slice_test.go:656: for size 25, got 3.000000 allocs want 1
    slice_test.go:656: for size 32, got 3.000000 allocs want 1
    slice_test.go:656: for size 33, got 4.000000 allocs want 1
    slice_test.go:656: for size 48, got 4.000000 allocs want 1
    slice_test.go:656: for size 49, got 4.000000 allocs want 1
    slice_test.go:656: for size 64, got 4.000000 allocs want 1
    slice_test.go:656: for size 65, got 5.000000 allocs want 2
--- FAIL: TestAppendByteCapInLoop (0.00s)

— watchflakes

[thepudds]

From a very quick look, I would have thought CL 722480 would have resolved this:

CL 722480: runtime: disable stack allocation tests on sanitizers
https://go-review.googlesource.com/c/go/+/722480

But looks like at least some of the failures reported are after that was merged?

Maybe I am misreading timestamps, or misunderstood the failure, or maybe something else is going on.

(Just a quick look, did not dig in.)

Sample failure reported above:

2025-11-24 15:54 gotip-linux-arm64-asan-clang15 go@0c69e773 runtime.TestAppendByteCapInLoop

commit 0c69e77
Author: Cherry Mui cherryyz@google.com
AuthorDate: Fri Nov 21 18:17:10 2025 -0800
Commit: Cherry Mui cherryyz@google.com
CommitDate: Mon Nov 24 07:54:12 2025 -0800

Revert "[dev.simd] internal/runtime/gc: add simd package based greentea kernels"

[mknyszek]

This appears to be fixed.