【TiDB 使用环境】生产环境
【TiDB 版本】8.5.1
【部署方式】私有云
【操作系统/CPU 架构/芯片详情】centos7.9
【遇到的问题：问题现象及影响】
tidb使用br备份失败，执行备份命令：
tiup br backup full --pd "1.1.1.1:2379,1.1.1.2:2379,1.1.1.3:2379" -f '*.*' -f '!*_dev.*' -f '!*_test.*' -f '!*.T_Oms_Sync_Log' --storage "s3://tidbbk/$(date +%Y%m%d)" --send-credentials-to-tikv=true --s3.endpoint "http://1.1.1.4:9000" --log-file /tmp/tidb_backup.log --ratelimit 128
报错提示：
[2026/01/05 23:50:02.008 +08:00] [WARN] [backup.go:311] ["setting `--ratelimit` and `--concurrency` at the same time, ignoring `--concurrency`: `--ratelimit` forces sequential (i.e. concurrency = 1) backup"] [ratelimit=134.2MB/s] [concurrency-specified=4]
[2026/01/06 01:16:58.106 +08:00] [INFO] [collector.go:77] ["Full Backup failed summary"] [total-ranges=11928] [ranges-succeed=11928] [ranges-failed=0] [backup-checksum=3m12.420542886s] [backup-fast-checksum=90.757067ms] [backup-total-ranges=26520]
备份报错日志，这里面提示的库和表，每天还都不是同一个：
[2026/01/07 01:17:11.018 +08:00] [ERROR] [validate.go:70] ["checksum mismatch"] [db=test] [table=T_test123] ["origin tidb crc64"=14892190027201354309] ["calculated crc64"=16947611913402066651] ["origin tidb total kvs"=396227232] ["calculated total kvs"=297170424] ["origin tidb total bytes"=60919859806] ["calculated total bytes"=44575500010] [stack="github.com/pingcap/tidb/br/pkg/checksum.FastChecksum\n\t/workspace/source/tidb/br/pkg/checksum/validate.go:70\ngithub.com/pingcap/tidb/br/pkg/task.RunBackup\n\t/workspace/source/tidb/br/pkg/task/backup.go:750\nmain.runBackupCommand\n\t/workspace/source/tidb/br/cmd/br/backup.go:56\nmain.newFullBackupCommand.func1\n\t/workspace/source/tidb/br/cmd/br/backup.go:148\ngithub.com/spf13/cobra.(*Command).execute\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:983\ngithub.com/spf13/cobra.(*Command).ExecuteC\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:1115\ngithub.com/spf13/cobra.(*Command).Execute\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:1039\nmain.main\n\t/workspace/source/tidb/br/cmd/br/main.go:36\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:267"]
[2026/01/07 01:17:11.129 +08:00] [INFO] [collector.go:78] ["Full Backup failed summary"] [total-ranges=12000] [ranges-succeed=12000] [ranges-failed=0] [backup-checksum=3m16.879045192s] [backup-fast-checksum=98.473826ms] [backup-total-ranges=26520]
[2026/01/07 01:17:11.129 +08:00] [ERROR] [backup.go:57] ["failed to backup"] [error="[BR:Backup:ErrBackupChecksumMismatch]backup checksum mismatch"] [errorVerbose="[BR:Backup:ErrBackupChecksumMismatch]backup checksum mismatch\ngithub.com/pingcap/errors.AddStack\n\t/root/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20240318064555-6bd07397691f/errors.go:178\ngithub.com/pingcap/errors.Trace\n\t/root/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20240318064555-6bd07397691f/juju_adaptor.go:15\ngithub.com/pingcap/tidb/br/pkg/checksum.FastChecksum\n\t/workspace/source/tidb/br/pkg/checksum/validate.go:80\ngithub.com/pingcap/tidb/br/pkg/task.RunBackup\n\t/workspace/source/tidb/br/pkg/task/backup.go:750\nmain.runBackupCommand\n\t/workspace/source/tidb/br/cmd/br/backup.go:56\nmain.newFullBackupCommand.func1\n\t/workspace/source/tidb/br/cmd/br/backup.go:148\ngithub.com/spf13/cobra.(*Command).execute\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:983\ngithub.com/spf13/cobra.(*Command).ExecuteC\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:1115\ngithub.com/spf13/cobra.(*Command).Execute\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:1039\nmain.main\n\t/workspace/source/tidb/br/cmd/br/main.go:36\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:267\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1650"] [stack="main.runBackupCommand\n\t/workspace/source/tidb/br/cmd/br/backup.go:57\nmain.newFullBackupCommand.func1\n\t/workspace/source/tidb/br/cmd/br/backup.go:148\ngithub.com/spf13/cobra.(*Command).execute\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:983\ngithub.com/spf13/cobra.(*Command).ExecuteC\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:1115\ngithub.com/spf13/cobra.(*Command).Execute\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:1039\nmain.main\n\t/workspace/source/tidb/br/cmd/br/main.go:36\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:267"]
[2026/01/07 01:17:11.129 +08:00] [ERROR] [main.go:38] ["br failed"] [error="[BR:Backup:ErrBackupChecksumMismatch]backup checksum mismatch"] [errorVerbose="[BR:Backup:ErrBackupChecksumMismatch]backup checksum mismatch\ngithub.com/pingcap/errors.AddStack\n\t/root/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20240318064555-6bd07397691f/errors.go:178\ngithub.com/pingcap/errors.Trace\n\t/root/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20240318064555-6bd07397691f/juju_adaptor.go:15\ngithub.com/pingcap/tidb/br/pkg/checksum.FastChecksum\n\t/workspace/source/tidb/br/pkg/checksum/validate.go:80\ngithub.com/pingcap/tidb/br/pkg/task.RunBackup\n\t/workspace/source/tidb/br/pkg/task/backup.go:750\nmain.runBackupCommand\n\t/workspace/source/tidb/br/cmd/br/backup.go:56\nmain.newFullBackupCommand.func1\n\t/workspace/source/tidb/br/cmd/br/backup.go:148\ngithub.com/spf13/cobra.(*Command).execute\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:983\ngithub.com/spf13/cobra.(*Command).ExecuteC\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:1115\ngithub.com/spf13/cobra.(*Command).Execute\n\t/root/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:1039\nmain.main\n\t/workspace/source/tidb/br/cmd/br/main.go:36\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:267\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1650"] [stack="main.main\n\t/workspace/source/tidb/br/cmd/br/main.go:38\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:267"]
请问下，有人知道这个咋解决吗 
风险：可能带脏数据，但很多生产在用。