ddl: fix ddl hang over when it meets panic in cancelling path (#23204)

[ti-srebot]

cherry-pick #23204 to release-4.0
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/23297

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/23297:release-4.0-46f5f217725e

---

Signed-off-by: ailinkid 314806019@qq.com

What problem does this PR solve?

Issue Number: close #23202

What is changed and how it works?

What's Changed:
record the error count when the goroutine restored from panic.

Check List

Tests

• Unit test
• Integration test

Release note

• fix ddl hang over when it meets panic in cancelling path.

[ti-srebot]

/run-all-tests

[ti-srebot]

@AilinKid you're already a collaborator in bot's repo.

[AilinKid]

/run-check_dev

[zimulala]

/LGTM

[AilinKid]

/build

[AilinKid]

/build

[bb7133]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• bb7133
• zimulala

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[bb7133]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: d303a90

[AilinKid]

/run-check_dev

[AilinKid]

do not merge now, I'm trying to fix an issue in check-dev with an error like that

[2021-03-15T07:13:17.203Z] ----------------------------------------------------------------------

[2021-03-15T07:13:17.203Z] FAIL: db_integration_test.go:1300: testIntegrationSuite2.TestAddIndexAfterAddColumn

[2021-03-15T07:13:17.203Z] 

[2021-03-15T07:13:17.203Z] db_integration_test.go:1308:

[2021-03-15T07:13:17.203Z]     s.tk.MustGetErrCode(sql, errno.ErrDupEntry)

[2021-03-15T07:13:17.203Z] /home/jenkins/agent/workspace/tidb_ghpr_check/go/src/github.com/pingcap/tidb/util/testkit/testkit.go:300:

[2021-03-15T07:13:17.203Z]     tk.c.Assert(int(sqlErr.Code), check.Equals, errCode, check.Commentf("Assertion failed, origin err:\n  %v", sqlErr))

[2021-03-15T07:13:17.203Z] ... obtained int = 1105

[2021-03-15T07:13:17.203Z] ... expected int = 1062

[2021-03-15T07:13:17.203Z] ... Assertion failed, origin err:

[2021-03-15T07:13:17.203Z]   ERROR 1105 (HY000): json: cannot unmarshal object into Go value of type bool

[AilinKid]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 3d4bb86

[AilinKid]

/run-unit-test

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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