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invalid memory address or nil pointer dereference in `(*SortExec).Next` `(*SortExec).fetchRowChunks` and index out of range [72] with length 0 in `(*SortedRowContainer).GetSortedRowAndAlwaysAppendToChunk` #52984
We are the BASS team from the School of Cyber Science and Technology at Beihang University. Our main focus is on system software security, operating systems, and program analysis research, as well as the development of automated program testing frameworks for detecting software defects. Using our self-developed database vulnerability testing tool, we have identified the above-mentioned vulnerabilities in TiDB that may lead to database crashes.
In response to [this](https://github.com/pingcap/tidb/issues/52984#issuecomment-2095210399):
>/close
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Bug Report
Please answer these questions before submitting your issue. Thanks!
1. Minimal reproduce step (Required)
First execute the following valid.sql valid.txt
Then a crash occurs when executing the error.sql below error.txt
2. What did you expect to see? (Required)
Expect no crashes
3. What did you see instead (Required)
tidb.log:
4. What is your TiDB version? (Required)
We are the BASS team from the School of Cyber Science and Technology at Beihang University. Our main focus is on system software security, operating systems, and program analysis research, as well as the development of automated program testing frameworks for detecting software defects. Using our self-developed database vulnerability testing tool, we have identified the above-mentioned vulnerabilities in TiDB that may lead to database crashes.