[Bug] IndexChangeJob stuck on WAITING_TXN state

[Yulei-Yang]

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• I had searched in the issues and found no similar issues.

Version

2.1.11 & master

What's Wrong?

IndexChangeJob created by build index command stuck and never finished/terminated.
fe.log shows that these jobs always under processed.

2026-02-12 16:28:33,927 INFO (schema-change-pool-9|662) [IndexChangeJob.runWaitingTxnJob():297] previous transactions are all finished, begin to send build or delete inverted index file tasks.job: 372540980, is delete: true
2026-02-12 16:28:34,428 INFO (schema-change-pool-8|661) [IndexChangeJob.runWaitingTxnJob():297] previous transactions are all finished, begin to send build or delete inverted index file tasks.job: 372540980, is delete: true
2026-02-12 16:28:34,929 INFO (schema-change-pool-5|658) [IndexChangeJob.runWaitingTxnJob():297] previous transactions are all finished, begin to send build or delete inverted index file tasks.job: 372540980, is delete: true
2026-02-12 16:28:35,430 INFO (schema-change-pool-8|661) [IndexChangeJob.runWaitingTxnJob():297] previous transactions are all finished, begin to send build or delete inverted index file tasks.job: 372540980, is delete: true
2026-02-12 16:28:35,930 INFO (schema-change-pool-4|657) [IndexChangeJob.runWaitingTxnJob():297] previous transactions are all finished, begin to send build or delete inverted index file tasks.job: 372540980, is delete: true

Trace the thread shows there exist NPE:

    `---[93.042899ms] org.apache.doris.alter.IndexChangeJob:runWaitingTxnJob() [throws Exception]
        +---[0.00% 0.001489ms ] com.google.common.base.Preconditions:checkState() #287
        +---[0.01% 0.010248ms ] org.apache.doris.alter.IndexChangeJob:isPreviousLoadFinished() #289
        +---[0.08% 0.073298ms ] org.apache.logging.log4j.Logger:info() #297
        +---[0.00% 8.58E-4ms ] org.apache.doris.catalog.Env:getCurrentInternalCatalog() #299
        +---[0.00% 0.001006ms ] org.apache.doris.datasource.InternalCatalog:getDbOrException() #300
        +---[0.00% 8.88E-4ms ] org.apache.doris.catalog.Database:getTableOrMetaException() #303
        +---[50.68% 47.150916ms ] org.apache.doris.alter.IndexChangeJob:checkTableStable() #308
        +---[49.07% 45.654057ms ] org.apache.doris.catalog.OlapTable:readLock() #312
        +---[0.08% 0.074283ms ] org.apache.doris.catalog.OlapTable:getSchemaByIndexId() #314 [throws Exception]
        +---[0.00% 0.002366ms ] org.apache.doris.catalog.OlapTable:readUnlock() #348
        `---throw:java.lang.NullPointerException #922 [null]

What You Expected?

Fix it

How to Reproduce?

No response

Anything Else?

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct