High rate of random FAIL: Test_builder_Build_Contention

Hi! I help maintain this in Debian, and I see a high rate of random self-tests failures. This is with v1.4.2 although I just uploaded v1.4.3 so we will see of it improves, but reading the git log doesn't indicate that to me.

Any ideas?

Report with several links to failing build logs:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1142971

It looks like the output below.

/Simon

```
167s === RUN Test_uploadManifestAndConfig
167s --- PASS: Test_uploadManifestAndConfig (0.00s)
167s === RUN Test_builder_Build_Contention
167s === RUN Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_0
167s === PAUSE Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_0
167s === RUN Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_1
167s === PAUSE Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_1
167s === RUN Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_2
167s === PAUSE Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_2
167s === RUN Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_3
167s === PAUSE Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_3
...
167s time="2026-07-29T07:22:03Z" level=info msg="downloaded cached layer 4"
167s time="2026-07-29T07:22:03Z" level=info msg="downloaded cached layer 5"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded layer 13"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 8"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 4"
167s time="2026-07-29T07:22:05Z" level=info msg="failed to download cached layer 7 falling back to conversion : random error on DownloadConvertedLayer"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded layer 7"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 8"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 0"
167s time="2026-07-29T07:22:04Z" level=info msg="downloaded cached layer 21"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded layer 15"
167s time="2026-07-29T07:22:03Z" level=info msg="downloaded cached layer 8"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded layer 23"
167s time="2026-07-29T07:22:04Z" level=info msg="downloaded cached layer 14"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 24"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 0 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="failed to download cached layer 6 falling back to conversion : random error on DownloadConvertedLayer"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded layer 21"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded layer 9"
167s time="2026-07-29T07:22:04Z" level=info msg="downloaded cached layer 2"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 17"
167s time="2026-07-29T07:22:04Z" level=info msg="downloaded cached layer 18"
167s === NAME Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_497
167s builder_test.go:58: Context deadline was exceeded, likely contention error
167s === CONT Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_427
167s time="2026-07-29T07:22:03Z" level=info msg="downloaded cached layer 7"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 4"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 5"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 6"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 7"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 14"
167s time="2026-07-29T07:22:05Z" level=info msg="failed to download cached layer 15 falling back to conversion : random error on DownloadConvertedLayer"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded layer 15"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 16"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded layer 17"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 18"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 19"
...
167s time="2026-07-29T07:22:05Z" level=info msg="layer 3 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 4 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 5 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 6 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 7 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 8 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 8 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 5 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 14"
167s time="2026-07-29T07:22:05Z" level=info msg="convert finished"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 1 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 2 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 3 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 4 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 5 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 6 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 7 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 16"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 14"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 13 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 14 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 15 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 16 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 17 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 1"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 1 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 2 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 3 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 4 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 5 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 6 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 7 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 8 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 9 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 10 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 11 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 12 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 13 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 14 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 15 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 16 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 17 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 18 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 19 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 20 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 21 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 22 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 23 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 24 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 24 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 9 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 17"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 1 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 2 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 3 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 4 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 5 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 6 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 12 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="downloaded cached layer 9"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 9 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 10 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 11 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 12 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 13 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 14 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 15 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 16 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 17 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 18 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 19 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 20 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 21 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 22 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 23 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 24 converted"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 24 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 9 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 10 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 11 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 12 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 13 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 14 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 15 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 16 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 17 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 18 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 19 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 20 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 21 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 22 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="layer 23 uploaded"
167s time="2026-07-29T07:22:05Z" level=info msg="convert finished"
167s --- FAIL: Test_builder_Build_Contention (0.01s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_470 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_460 (0.00s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_498 (1.20s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_478 (1.20s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_0 (1.21s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_493 (1.20s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_480 (1.20s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_495 (1.21s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_497 (1.14s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_496 (1.21s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_442 (1.13s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_461 (1.13s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_499 (1.22s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_441 (1.12s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_459 (1.12s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_479 (1.21s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_458 (1.12s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_446 (1.16s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_453 (1.11s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_457 (1.11s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_469 (1.14s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_476 (1.17s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_475 (1.17s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_474 (1.17s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_454 (1.12s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_445 (0.04s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_467 (1.15s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_447 (0.05s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_462 (1.15s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_396 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_395 (0.00s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_471 (1.16s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_113 (1.25s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_494 (1.24s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_468 (1.16s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_477 (1.19s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_473 (1.19s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_464 (1.25s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_492 (1.25s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_463 (1.19s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_425 (0.05s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_466 (1.17s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_398 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_382 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_381 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_380 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_383 (0.01s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_429 (0.07s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_428 (0.08s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_377 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_450 (0.09s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_405 (0.07s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_406 (0.07s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_373 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_372 (0.00s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_472 (1.26s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_409 (0.11s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_369 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_368 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_367 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_366 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_365 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_364 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_408 (0.12s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_452 (0.14s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_451 (0.14s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_449 (0.14s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_375 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_407 (0.11s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_410 (0.12s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_374 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_444 (0.14s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_371 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_455 (0.14s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_403 (0.11s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_404 (0.12s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_397 (0.11s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_426 (0.13s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_465 (1.23s)
167s --- FAIL: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_456 (1.23s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_390 (0.10s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_440 (0.16s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_402 (0.13s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_348 (0.01s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_361 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_438 (0.16s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_448 (0.17s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_358 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_356 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_337 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_360 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_359 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_342 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_354 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_357 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_331 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_412 (0.17s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_329 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_328 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_327 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_326 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_325 (0.00s)
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167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_258 (0.20s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_108 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_107 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_184 (0.10s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_278 (0.24s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_181 (0.10s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_103 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_110 (0.01s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_121 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_197 (0.13s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_250 (0.20s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_154 (0.08s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_153 (0.08s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_228 (0.17s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_187 (0.12s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_193 (0.13s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_189 (0.12s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_170 (0.09s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_186 (0.12s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_169 (0.10s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_89 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_172 (0.10s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_166 (0.10s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_86 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_85 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_213 (0.16s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_200 (0.15s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_192 (0.14s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_220 (0.17s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_81 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_80 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_79 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_78 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_159 (0.10s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_76 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_68 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_95 (0.01s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_141 (0.08s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_105 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_126 (0.06s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_133 (0.07s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_109 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_259 (0.24s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_91 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_102 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_65 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_62 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_69 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_71 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_146 (0.09s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_118 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_67 (0.01s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_120 (0.06s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_52 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_51 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_50 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_142 (0.09s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_112 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_94 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_96 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_106 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_138 (0.09s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_49 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_34 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_33 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_32 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_31 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_30 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_29 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_119 (0.06s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_117 (0.06s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_183 (0.15s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_98 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_63 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_100 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_101 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_92 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_168 (0.13s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_99 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_74 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_77 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_177 (0.14s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_178 (0.15s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_23 (0.01s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_13 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_21 (0.01s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_11 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_10 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_9 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_8 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_152 (0.12s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_84 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_66 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_47 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_53 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_73 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_61 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_87 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_116 (0.08s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_75 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_38 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_97 (0.06s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_72 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_41 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_64 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_40 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_491 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_488 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_60 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_487 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_2 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_486 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_485 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_490 (0.01s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_45 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_481 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_58 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_57 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_56 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_83 (0.07s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_35 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_39 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_436 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_435 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_37 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_149 (0.16s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_93 (0.08s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_422 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_420 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_418 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_25 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_415 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_432 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_433 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_431 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_59 (0.07s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_15 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_147 (0.16s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_27 (0.06s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_424 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_70 (0.07s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_48 (0.07s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_18 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_104 (0.11s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_115 (0.12s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_7 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_19 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_437 (0.00s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_414 (0.01s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_22 (0.06s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_17 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_26 (0.06s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_90 (0.09s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_82 (0.09s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_4 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_28 (0.06s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_1 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_36 (0.07s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_16 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_88 (0.09s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_148 (0.17s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_42 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_3 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_46 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_111 (0.12s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_489 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_24 (0.06s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_12 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_14 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_44 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_20 (0.06s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_5 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_417 (0.01s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_483 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_423 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_419 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_6 (0.05s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_482 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_416 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_43 (0.04s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_55 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_54 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_434 (0.02s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_484 (0.03s)
167s --- PASS: Test_builder_Build_Contention/Test_builder_Err_Lock_Contention_Seed_421 (0.02s)
```

Start with Test_builder_Build_Contention in builder_test.go, especially the failure reported at line 58, and reproduce the seeded contention cases from the Debian logs. Trace the timeout and concurrent builder operations before deciding whether the test or implementation is responsible. Done means the test no longer fails randomly under the reported conditions.

Written by the indexing model from the issue text.