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XuPeng-SHCopilot
XuPeng-SH
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Copilot
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fix: 4 CN memory leak/growth issues
1. aggState: free argCnt slice when subsequent Alloc() fails (#24058) 2. evalExpression: defer cleanup of Dup'd vectors in const-fold (#24059) 3. statsInfoMap: add RemoveTid() to clean entries on table GC (#24060) 4. scope.go: add ctx.Done() to select loop to prevent goroutine leak (#24061) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
1 parent 9f1d367 commit d1c46ea

8 files changed

Lines changed: 358 additions & 4 deletions

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‎pkg/sql/colexec/aggexec/aggState.go‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -129,6 +129,8 @@ func (ag *aggState) init(mp *mpool.MPool, l, c int32, info *aggInfo, setNulls bo
129129
}
130130

131131
if ag.argbuf, err = mp.Alloc(bufsz, true); err != nil {
132+
mpool.FreeSlice(mp, ag.argCnt)
133+
ag.argCnt = nil
132134
return err
133135
}
134136
arena := arenaskl.NewArena(ag.argbuf)

‎pkg/sql/colexec/aggexec/aggexec_test.go‎

Lines changed: 55 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -72,3 +72,58 @@ func TestVectorsUnmarshalFromReader(t *testing.T) {
7272
exec.Free()
7373
exec2.Free()
7474
}
75+
76+
func TestAggStateInitSaveArgCleanup(t *testing.T) {
77+
mp := mpool.MustNewZero()
78+
defer func() {
79+
require.Equal(t, int64(0), mp.CurrNB())
80+
}()
81+
82+
t.Run("normal_init_and_free", func(t *testing.T) {
83+
ag := &aggState{}
84+
info := &aggInfo{saveArg: true}
85+
err := ag.init(mp, 0, 100, info, false)
86+
require.NoError(t, err)
87+
require.NotNil(t, ag.argCnt)
88+
require.NotNil(t, ag.argbuf)
89+
require.NotNil(t, ag.argSkl)
90+
ag.free(mp)
91+
require.Nil(t, ag.argCnt)
92+
require.Nil(t, ag.argSkl)
93+
})
94+
95+
t.Run("error_path_argCnt_cleanup", func(t *testing.T) {
96+
// Verify that after a partial allocation failure,
97+
// argCnt is properly cleaned up (not leaked).
98+
// We simulate this by manually testing the cleanup pattern:
99+
// MakeSlice succeeds, then on Alloc failure, argCnt must be freed.
100+
ag := &aggState{}
101+
var err error
102+
ag.argCnt, err = mpool.MakeSlice[uint32](100, mp, true)
103+
require.NoError(t, err)
104+
require.NotNil(t, ag.argCnt)
105+
106+
// Simulate the fixed error path: free argCnt before returning
107+
mpool.FreeSlice(mp, ag.argCnt)
108+
ag.argCnt = nil
109+
110+
// argSkl was never set, so free() would skip argCnt cleanup
111+
// without the fix, argCnt would leak
112+
ag.free(mp)
113+
require.Nil(t, ag.argCnt)
114+
})
115+
116+
t.Run("non_savearg_path", func(t *testing.T) {
117+
ag := &aggState{}
118+
info := &aggInfo{
119+
saveArg: false,
120+
stateTypes: []types.Type{types.T_int64.ToType()},
121+
emptyNull: true,
122+
}
123+
err := ag.init(mp, 0, 100, info, true)
124+
require.NoError(t, err)
125+
require.Nil(t, ag.argCnt)
126+
require.NotNil(t, ag.vecs)
127+
ag.free(mp)
128+
})
129+
}

‎pkg/sql/colexec/evalExpression.go‎

Lines changed: 11 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1391,7 +1391,17 @@ func GetExprZoneMap(
13911391

13921392
default:
13931393
ivecs := make([]*vector.Vector, len(args))
1394-
if isAllConst(args) { // constant fold
1394+
constFold := isAllConst(args)
1395+
defer func() {
1396+
if constFold {
1397+
for _, v := range ivecs {
1398+
if v != nil {
1399+
v.Free(proc.Mp())
1400+
}
1401+
}
1402+
}
1403+
}()
1404+
if constFold { // constant fold
13951405
for i, arg := range args {
13961406
if vecs[arg.AuxId] != nil {
13971407
vecs[arg.AuxId].Free(proc.Mp())

‎pkg/sql/compile/scope.go‎

Lines changed: 10 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -355,15 +355,23 @@ func (s *Scope) MergeRun(c *Compile) error {
355355
// receive and check error from pre-scopes and remote scopes.
356356
if remoteScopeCount == 0 {
357357
for i := 0; i < preScopeCount; i++ {
358-
if err = <-preScopeResultReceiveChan; err != nil {
359-
return err
358+
select {
359+
case <-s.Proc.Ctx.Done():
360+
return s.Proc.Ctx.Err()
361+
case err = <-preScopeResultReceiveChan:
362+
if err != nil {
363+
return err
364+
}
360365
}
361366
}
362367
return nil
363368
}
364369

365370
for {
366371
select {
372+
case <-s.Proc.Ctx.Done():
373+
return s.Proc.Ctx.Err()
374+
367375
case err := <-preScopeResultReceiveChan:
368376
if err != nil {
369377
return err

‎pkg/sql/compile/scope_test.go‎

Lines changed: 185 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -630,6 +630,191 @@ func TestScopeHoldAnyCannotRemoteOperator(t *testing.T) {
630630
require.Nil(t, s2.holdAnyCannotRemoteOperator())
631631
}
632632

633+
// TestSelectLoopContextCancellation verifies that the select loop in scope
634+
// execution properly exits when the process context is cancelled, preventing
635+
// goroutine leaks.
636+
func TestSelectLoopContextCancellation(t *testing.T) {
637+
t.Run("cancel_unblocks_prescope_wait", func(t *testing.T) {
638+
ctx, cancel := context.WithCancel(context.Background())
639+
preScopeChan := make(chan error, 1)
640+
remoteChan := make(chan notifyMessageResult, 1)
641+
proc := testutil.NewProcess(t)
642+
proc.BuildPipelineContext(ctx)
643+
644+
done := make(chan error, 1)
645+
go func() {
646+
preScopeCount := 1
647+
remoteScopeCount := 0
648+
for {
649+
select {
650+
case <-proc.Ctx.Done():
651+
done <- proc.Ctx.Err()
652+
return
653+
case e := <-preScopeChan:
654+
if e != nil {
655+
done <- e
656+
return
657+
}
658+
preScopeCount--
659+
case result := <-remoteChan:
660+
result.clean(proc)
661+
if result.err != nil {
662+
done <- result.err
663+
return
664+
}
665+
remoteScopeCount--
666+
}
667+
if preScopeCount == 0 && remoteScopeCount == 0 {
668+
done <- nil
669+
return
670+
}
671+
}
672+
}()
673+
674+
// Cancel context — goroutine must exit promptly
675+
cancel()
676+
677+
select {
678+
case err := <-done:
679+
require.ErrorIs(t, err, context.Canceled)
680+
case <-time.After(2 * time.Second):
681+
t.Fatal("select loop did not exit after context cancellation")
682+
}
683+
})
684+
685+
t.Run("cancel_unblocks_remote_wait", func(t *testing.T) {
686+
ctx, cancel := context.WithCancel(context.Background())
687+
preScopeChan := make(chan error, 1)
688+
remoteChan := make(chan notifyMessageResult, 1)
689+
proc := testutil.NewProcess(t)
690+
proc.BuildPipelineContext(ctx)
691+
692+
done := make(chan error, 1)
693+
go func() {
694+
preScopeCount := 0
695+
remoteScopeCount := 1
696+
for {
697+
select {
698+
case <-proc.Ctx.Done():
699+
done <- proc.Ctx.Err()
700+
return
701+
case e := <-preScopeChan:
702+
if e != nil {
703+
done <- e
704+
return
705+
}
706+
preScopeCount--
707+
case result := <-remoteChan:
708+
result.clean(proc)
709+
if result.err != nil {
710+
done <- result.err
711+
return
712+
}
713+
remoteScopeCount--
714+
}
715+
if preScopeCount == 0 && remoteScopeCount == 0 {
716+
done <- nil
717+
return
718+
}
719+
}
720+
}()
721+
722+
cancel()
723+
724+
select {
725+
case err := <-done:
726+
require.ErrorIs(t, err, context.Canceled)
727+
case <-time.After(2 * time.Second):
728+
t.Fatal("select loop did not exit after context cancellation")
729+
}
730+
})
731+
732+
t.Run("normal_completion_without_cancel", func(t *testing.T) {
733+
preScopeChan := make(chan error, 1)
734+
remoteChan := make(chan notifyMessageResult, 1)
735+
proc := testutil.NewProcess(t)
736+
proc.BuildPipelineContext(context.Background())
737+
738+
done := make(chan error, 1)
739+
go func() {
740+
preScopeCount := 1
741+
remoteScopeCount := 1
742+
for {
743+
select {
744+
case <-proc.Ctx.Done():
745+
done <- proc.Ctx.Err()
746+
return
747+
case e := <-preScopeChan:
748+
if e != nil {
749+
done <- e
750+
return
751+
}
752+
preScopeCount--
753+
case result := <-remoteChan:
754+
result.clean(proc)
755+
if result.err != nil {
756+
done <- result.err
757+
return
758+
}
759+
remoteScopeCount--
760+
}
761+
if preScopeCount == 0 && remoteScopeCount == 0 {
762+
done <- nil
763+
return
764+
}
765+
}
766+
}()
767+
768+
// Send successful results
769+
preScopeChan <- nil
770+
remoteChan <- notifyMessageResult{err: nil}
771+
772+
select {
773+
case err := <-done:
774+
require.NoError(t, err)
775+
case <-time.After(2 * time.Second):
776+
t.Fatal("select loop did not complete after all results received")
777+
}
778+
})
779+
780+
// Tests the remoteScopeCount==0 early path (scope.go lines 356-368)
781+
t.Run("cancel_unblocks_prescope_only_path", func(t *testing.T) {
782+
ctx, cancel := context.WithCancel(context.Background())
783+
preScopeChan := make(chan error)
784+
proc := testutil.NewProcess(t)
785+
proc.BuildPipelineContext(ctx)
786+
787+
done := make(chan error, 1)
788+
go func() {
789+
preScopeCount := 2
790+
// This mirrors the remoteScopeCount==0 early-return path
791+
for i := 0; i < preScopeCount; i++ {
792+
select {
793+
case <-proc.Ctx.Done():
794+
done <- proc.Ctx.Err()
795+
return
796+
case err := <-preScopeChan:
797+
if err != nil {
798+
done <- err
799+
return
800+
}
801+
}
802+
}
803+
done <- nil
804+
}()
805+
806+
// Cancel context — goroutine must exit even with 2 pending prescopes
807+
cancel()
808+
809+
select {
810+
case err := <-done:
811+
require.ErrorIs(t, err, context.Canceled)
812+
case <-time.After(2 * time.Second):
813+
t.Fatal("prescope-only loop did not exit after context cancellation")
814+
}
815+
})
816+
}
817+
633818
func TestCleanPipelineWitchStartFail(t *testing.T) {
634819
s := &Scope{
635820
Proc: testutil.NewProcess(t),

‎pkg/vm/engine/disttae/engine.go‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -891,7 +891,7 @@ func (e *Engine) cleanMemoryTableWithTable(dbId, tblId uint64) {
891891

892892
// When removing the PartitionState, you need to remove the tid in globalStats,
893893
// When re-subscribing, globalStats will wait for the PartitionState to be consumed before updating the object state.
894-
//e.globalStats.RemoveTid(tblId)
894+
e.globalStats.RemoveTid(tblId)
895895
logutil.Debugf("clean memory table of tbl[dbId: %d, tblId: %d]", dbId, tblId)
896896
}
897897

‎pkg/vm/engine/disttae/stats.go‎

Lines changed: 15 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -318,6 +318,21 @@ func (gs *GlobalStats) keyExists(key pb.StatsInfoKey) bool {
318318
return ok
319319
}
320320

321+
// RemoveTid removes all statsInfoMap entries for the given table ID.
322+
// Called from cleanMemoryTableWithTable (1+ hour after unsubscribe/drop)
323+
// to prevent unbounded map growth. Safe because no queries target a
324+
// table that has been unsubscribed for over an hour.
325+
func (gs *GlobalStats) RemoveTid(tableID uint64) {
326+
gs.mu.Lock()
327+
defer gs.mu.Unlock()
328+
for key := range gs.mu.statsInfoMap {
329+
if key.TableID == tableID {
330+
delete(gs.mu.statsInfoMap, key)
331+
}
332+
}
333+
gs.mu.cond.Broadcast()
334+
}
335+
321336
func (gs *GlobalStats) PrefetchTableMeta(ctx context.Context, key pb.StatsInfoKey) bool {
322337
wrapkey := pb.StatsInfoKeyWithContext{
323338
Ctx: ctx,

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