honor canceled context and do not leak on mergeChannels

[harshavardhana]

Description

honor canceled context and do not leak on mergeChannels

Motivation and Context

mergeEntryChannels has the potential to perpetually
wait on the results channel, context might be closed
and we did not honor the caller context canceling.

How to test this PR?

Not sure, but it looks like reproduced here #15033

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Documentation updated
• Unit tests added/updated

[minio-trusted]

Mint Automation

Test	Result
mint-large-bucket.sh	✔️
mint-fs.sh	✔️
mint-gateway-s3.sh	✔️
mint-erasure.sh	✔️
mint-compress-encrypt-dist-erasure.sh	✔️
mint-pools.sh	✔️
mint-dist-erasure.sh	❌ more...

15034-3611125/mint-dist-erasure.sh.log:

Running with
SERVER_ENDPOINT:      minio-k8s2:32533
ACCESS_KEY:           minio
SECRET_KEY:           ***REDACTED***
ENABLE_HTTPS:         0
SERVER_REGION:        us-east-1
MINT_DATA_DIR:        /mint/data
MINT_MODE:            full
ENABLE_VIRTUAL_STYLE: 0
RUN_ON_FAIL:          0

To get logs, run 'docker cp :/mint/log /tmp/mint-logs'

(1/15) Running aws-sdk-go tests ... done in 0 seconds
(2/15) Running aws-sdk-java tests ... done in 2 seconds
(3/15) Running aws-sdk-php tests ... done in 43 seconds
(4/15) Running aws-sdk-ruby tests ... done in 6 seconds
(5/15) Running awscli tests ... done in 55 seconds
(6/15) Running healthcheck tests ... done in 0 seconds
(7/15) Running mc tests ... done in 29 seconds
(8/15) Running minio-dotnet tests ... done in 6 minutes and 12 seconds
(9/15) Running minio-go tests ... done in 1 minutes and 37 seconds
(10/15) Running minio-java tests ... done in 33 seconds
(11/15) Running minio-js tests ... FAILED in 53 seconds
{
  "name": "minio-js",
  "function": "\"after all\" hook for \"removeObjects(bucketName, objectsList)",
  "args": "bucketName:minio-js-test-ver-presign-a2a93fbf-07a8-410c-a0fe-4dc15bcbf1f4\"",
  "duration": 5,
  "status": "FAIL",
  "error": "S3Error: The bucket you tried to delete is not empty. You must delete all versions in the bucket. at Object.parseError (node_modules/minio/dist/main/xml-parsers.js:71:11) at /mint/run/core/minio-js/node_modules/minio/dist/main/transformers.js:166:22 at DestroyableTransform._flush (node_modules/minio/dist/main/transformers.js:90:10) at DestroyableTransform.prefinish (node_modules/readable-stream/lib/_stream_transform.js:129:10) at prefinish (node_modules/readable-stream/lib/_stream_writable.js:611:14) at finishMaybe (node_modules/readable-stream/lib/_stream_writable.js:620:5) at endWritable (node_modules/readable-stream/lib/_stream_writable.js:643:3) at DestroyableTransform.Writable.end (node_modules/readable-stream/lib/_stream_writable.js:571:22) at IncomingMessage.onend (internal/streams/readable.js:670:10) at endReadableNT (internal/streams/readable.js:1333:12) at processTicksAndRejections (internal/process/task_queues.js:82:21)"
}
(11/15) Running minio-py tests ... done in 1 minutes and 18 seconds
(12/15) Running s3cmd tests ... done in 31 seconds
(13/15) Running s3select tests ... done in 4 seconds
(14/15) Running versioning tests ... done in 3 minutes and 4 seconds

Executed 14 out of 15 tests successfully.

Deleting image on docker hub
Deleting image locally

[klauspost]

👍🏼

[vadmeste]

LGTM