Panic when planner/core.tryLockMDLAndUpdateSchemaIfNecessary for insert statement

[yibin87]

Git Commit Hash\"=336d3a30f12cf11f10593b7131046c2291a22d4c] [\"Git Branch\"=heads/refs/tags/v8.3.0-alpha] [\"UTC Build Time\"=\"2024-08-17 11:45:28\"]

Error from regression test: {"pod":"tc-tidb-1","container":"tidb","level":"ERROR","namespace":"endless-htap-consistency-chaos-tps-7551858-1-686","log":"[conn.go:1040] [\"connection running loop panic\"] [conn=302008324] [session_alias=] [lastSQL=\"insert into pk_is_handle1(a,b,c,d,e,g,h,i,j) values 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[err=\"runtime error: invalid memory address or nil pointer dereference\"] [stack=\"github.com/pingcap/tidb/pkg/server.(clientConn).Run.func1\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/server/conn.go:1043\nruntime.gopanic\n\t/usr/local/go/src/runtime/panic.go:914\ngithub.com/pingcap/tidb/pkg/executor.(Compiler).Compile.func1\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/executor/compiler.go:57\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/signal_unix.go:861\ngithub.com/pingcap/tidb/pkg/infoschema.(SessionTables).ensureSchema\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/infoschema/infoschema.go:757\ngithub.com/pingcap/tidb/pkg/infoschema.(SessionTables).AddTable\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/infoschema/infoschema.go:703\ngithub.com/pingcap/tidb/pkg/infoschema.(SessionExtendedInfoSchema).UpdateTableInfo\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/infoschema/infoschema.go:869\ngithub.com/pingcap/tidb/pkg/planner/core.tryLockMDLAndUpdateSchemaIfNecessary\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/planner/core/preprocess.go:1943\ngithub.com/pingcap/tidb/pkg/planner/core.(preprocessor).handleTableName\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/planner/core/preprocess.go:1608\ngithub.com/pingcap/tidb/pkg/planner/core.(preprocessor).Enter\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/planner/core/preprocess.go:263\ngithub.com/pingcap/tidb/pkg/parser/ast.(InsertStmt).Accept\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/parser/ast/dml.go:2436\ngithub.com/pingcap/tidb/pkg/planner/core.Preprocess\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/planner/core/preprocess.go:141\ngithub.com/pingcap/tidb/pkg/executor.(Compiler).Compile\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/executor/compiler.go:67\ngithub.com/pingcap/tidb/pkg/session.(session).ExecuteStmt\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/session/session.go:2093\ngithub.com/pingcap/tidb/pkg/server.(TiDBContext).ExecuteStmt\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/server/driver_tidb.go:291\ngithub.com/pingcap/tidb/pkg/server.(clientConn).handleStmt\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/server/conn.go:2051\ngithub.com/pingcap/tidb/pkg/server.(clientConn).handleQuery\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/server/conn.go:1805\ngithub.com/pingcap/tidb/pkg/server.(clientConn).dispatch\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/server/conn.go:1379\ngithub.com/pingcap/tidb/pkg/server.(clientConn).Run\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/server/conn.go:1141\ngithub.com/pingcap/tidb/pkg/server.(Server).onConn\n\t/home/jenkins/agent/workspace/build-common/go/src/github.com/pingcap/tidb/pkg/server/server.go:741\"]"}

[wjhuang2016]

Could you reproduce it ?

[yibin87]

Two tcms tests failed due to this panic just recently, no simple cases to reproduce the issue now.

[wjhuang2016]

Two tcms tests failed due to this panic just recently, no simple cases to reproduce the issue now.

So the bug may be introduced recently?

[yibin87]

Two tcms tests failed due to this panic just recently, no simple cases to reproduce the issue now.

So the bug may be introduced recently?

I think so

[yibin87]

/cc @tiancaiamao FYI

[wjhuang2016]

Maybe caused by https://github.com/pingcap/tidb/pull/55229

[tiancaiamao]

No reproduce found recently, so it should have been fix.