From 0b7d5aac9479b2e8e174febbb7fee7bcbab6bfd0 Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Tue, 10 Mar 2026 12:24:28 -0700
Subject: [PATCH] guard copyDataBasedOnIndexFile size check against nil needle
 map

The post-compaction size validation at line 538 accesses
v.nm.ContentSize() and v.nm.DeletedSize(). If CommitCompact has
concurrently set v.nm to nil, this causes a SIGSEGV. Skip the
validation when v.nm is nil since the actual data copy uses local
needle maps (oldNm/newNm) and is unaffected.

Fixes #8591
---
 weed/storage/volume_vacuum.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/weed/storage/volume_vacuum.go b/weed/storage/volume_vacuum.go
index 6a551bfe7..5dc5d8233 100644
--- a/weed/storage/volume_vacuum.go
+++ b/weed/storage/volume_vacuum.go
@@ -533,7 +533,7 @@ func (v *Volume) copyDataBasedOnIndexFile(opts *CompactOptions) (err error) {
 	if err != nil {
 		return err
 	}
-	if v.Ttl.String() == "" {
+	if v.Ttl.String() == "" && v.nm != nil {
 		dstDatSize, _, err := dstDatBackend.GetStat()
 		if err != nil {
 			return err