log_backup: fix panic during advancer owner transfer

[YuJuncen]

What problem does this PR solve?

Issue Number: close #52597

Problem Summary:

1. When losing the advancer ownership, the channel for subscription may be full.
2. the consumer has already gone due to the canceled context. Hence making the producer(subscription) goroutine stuck.
3. After the graceful shutdown period, the output channel will be eventually closed and we will get a send on closed channel panic.

What changed and how does it work?

• When sending to the channel, also select the context.
• Catch all panic and convert them to errors (so we can retry.)

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

Fixed a bug where TiDB may panic when log backup enabled and PD is unreachable.

[tiprow]

Hi @YuJuncen. Thanks for your PR.

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[codecov]

Codecov Report

Merging #52671 (714aac5) into master (224ae15) will increase coverage by 1.2194%.
Report is 25 commits behind head on master.
The diff coverage is 95.5555%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #52671        +/-   ##
================================================
+ Coverage   74.3558%   75.5752%   +1.2194%     
================================================
  Files          1470       1474         +4     
  Lines        354521     436242     +81721     
================================================
+ Hits         263607     329691     +66084     
- Misses        71638      85939     +14301     
- Partials      19276      20612      +1336     

Flag	Coverage Δ
integration	50.4641% <13.3333%> (?)
unit	71.2466% <95.5555%> (-1.8806%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	53.9957% <ø> (-2.3014%)	⬇️
parser	∅ <ø> (∅)
br	61.4963% <95.5555%> (+18.8564%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, Leavrth

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-18 03:36:36.679597801 +0000 UTC m=+482015.790644248: ☑️ agreed by Leavrth.
• 2024-04-18 04:06:51.365669359 +0000 UTC m=+483830.476715802: ☑️ agreed by 3pointer.

[Leavrth]

/retest

[tiprow]

@Leavrth: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[Leavrth]

/ok-to-test

[BornChanger]

/retest

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #52713.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #53060.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #53703.

[YuJuncen]

/run-cherry-picker

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #54708.