The test failed on branch=master, cloud=gce:
test artifacts and logs in: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/artifacts/backup/mixed-version/run_1
	test_impl.go:274,assertions.go:262,assertions.go:1332,require.go:1231,backup.go:193,versionupgrade.go:207,backup.go:212,test_runner.go:779: 
			Error Trace:	backup.go:193
			            				versionupgrade.go:207
			            				backup.go:212
			            				test_runner.go:779
			            				asm_amd64.s:1581
			Error:      	Received unexpected error:
			            	pq: failed to run backup: exporting 3 ranges: pebble/table: corrupt index entry
			Test:       	backup/mixed-version