Add a test for an idiotic checksum bug

.gitea/workflows/test.yml

@@ -1818,6 +1818,24 @@ jobs:
           echo ""
         done
 
+  test_old_partwr_csum:
+    runs-on: ubuntu-latest
+    needs: build
+    container: ${{env.TEST_IMAGE}}:${{github.sha}}
+    steps:
+    - name: Run test
+      id: test
+      timeout-minutes: 3
+      run: OLD=1 /root/vitastor/tests/test_partwr_csum.sh
+    - name: Print logs
+      if: always() && steps.test.outcome == 'failure'
+      run: |
+        for i in /root/vitastor/testdata/*.log /root/vitastor/testdata/*.txt; do
+          echo "-------- $i --------"
+          cat $i
+          echo ""
+        done
+
   test_heal_old_csum_32k_dmj:
     runs-on: ubuntu-latest
     needs: build

tests/run_tests.sh

@@ -138,6 +138,7 @@ OLD=1 SCHEME=xor ./test_scrub.sh
 OLD=1 PG_SIZE=3 ./test_scrub.sh
 OLD=1 PG_SIZE=6 PG_MINSIZE=4 OSD_COUNT=6 SCHEME=ec ./test_scrub.sh
 OLD=1 SCHEME=ec ./test_scrub.sh
+OLD=1 ./test_partwr_csum.sh
 
 TEST_NAME=old_csum_32k_dmj OLD=1 OSD_ARGS="--data_csum_type crc32c --csum_block_size 32k --inmemory_metadata false --inmemory_journal false" OFFSET_ARGS=$OSD_ARGS ./test_heal.sh
 TEST_NAME=old_csum_32k_dj  OLD=1 OSD_ARGS="--data_csum_type crc32c --csum_block_size 32k --inmemory_journal false" OFFSET_ARGS=$OSD_ARGS ./test_heal.sh

tests/test_partwr_csum.sh

@@ -0,0 +1,18 @@
+#!/bin/bash -ex
+
+OSD_ARGS="--data_csum_type crc32c"
+OFFSET_ARGS=$OSD_ARGS
+GLOBAL_CONFIG=',"client_eio_retry_interval":0'
+. `dirname $0`/run_3osds.sh
+
+$VITASTOR_CLI create -s 32M testimg
+
+$VITASTOR_FIO -bs=4k -blockalign=128k -direct=1 -iodepth=16 -end_fsync=1 -rw=write -image=testimg
+
+$VITASTOR_CLI dd iimg=testimg of=/dev/null
+
+if grep -q 'Checksum mismatch' ./testdata/osd*.log; then
+    format_error Checksum mismatches detected during test
+fi
+
+format_green OK