tidb panic for "IndexMergeProcessWorker: runtime error: invalid memory address or nil pointer dereference" #46005
Description
Bug Report
Please answer these questions before submitting your issue. Thanks!
1. Minimal reproduce step (Required)
steps please see in :
utf-go-clustered-index-panic.log
2. What did you expect to see? (Required)
no panic
3. What did you see instead (Required)
[2023/08/10 20:54:12.065 +00:00] [ERROR] [index_merge_reader.go:884] ["IndexMergeProcessWorker: runtime error: invalid memory address or nil pointer dereference"] [conn=2636120476]
[2023/08/10 20:54:12.065 +00:00] [ERROR] [misc.go:91] ["panic in the recoverable goroutine"] [r="\"invalid memory address or nil pointer dereference\""] ["stack trace"="[github.com/pingcap/tidb/util.WithRecovery.func1\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/util/misc.go:93\nruntime.gopanic\n\t/usr/local/go/src/runtime/panic.go:914\nruntime.panicmem\n\t/usr/local/go/src/runtime/panic.go:261\nruntime.sigpanic\n\t/usr/local/go/src/runtime](http://github.com/pingcap/tidb/util.WithRecovery.func1/n/t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/util/misc.go:93/nruntime.gopanic/n/t/usr/local/go/src/runtime/panic.go:914/nruntime.panicmem/n/t/usr/local/go/src/runtime/panic.go:261/nruntime.sigpanic/n/t/usr/local/go/src/runtime)
4. What is your TiDB version? (Required)
master