更新完了以后，服務行程死了并掛起，查看日志檔案，顯示如下錯誤
Database initialization error: can't compile engine: Malformed database
查看clamd行程狀態，顯示：
clamd dead but subsys locked
完整的相關日志檔案（messages.log）如下：
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Nov 26 11:36:07 mailkvm-21 freshclam[6693]: ClamAV update process started at Tue Nov 26 11:36:07 2019
Nov 26 11:36:07 mailkvm-21 freshclam[6693]: Your ClamAV installation is OUTDATED!
Nov 26 11:36:07 mailkvm-21 freshclam[6693]: Local version: 0.99.2 Recommended version: 0.102.1
Nov 26 11:36:07 mailkvm-21 freshclam[6693]: DON'T PANIC! Read http://www.clamav.net/documents/upgrading-clamav
Nov 26 11:36:09 mailkvm-21 freshclam[6693]: Downloading main-59.cdiff [100%]
Nov 26 11:37:11 mailkvm-21 freshclam[6693]: main.cld updated (version: 59, sigs: 4564902, f-level: 60, builder: sigmgr)
Nov 26 11:37:50 mailkvm-21 freshclam[6693]: getfile: daily-24577.cdiff not found on db.cn.clamav.net (IP: 104.16.218.84)
Nov 26 11:37:50 mailkvm-21 freshclam[6693]: getpatch: Can't download daily-24577.cdiff from db.cn.clamav.net
Nov 26 11:38:16 mailkvm-21 freshclam[6693]: Trying host db.cn.clamav.net (104.16.219.84)...
Nov 26 11:38:17 mailkvm-21 freshclam[6693]: getfile: daily-24577.cdiff not found on db.cn.clamav.net (IP: 104.16.219.84)
Nov 26 11:38:17 mailkvm-21 freshclam[6693]: getpatch: Can't download daily-24577.cdiff from db.cn.clamav.net
Nov 26 11:38:37 mailkvm-21 freshclam[6693]: Trying host db.cn.clamav.net (2606:4700::6810:da54)...
Nov 26 11:38:37 mailkvm-21 freshclam[6693]: nonblock_connect: connect(): fd=5 errno=101: Network is unreachable
Nov 26 11:38:37 mailkvm-21 freshclam[6693]: Can't connect to port 80 of host db.cn.clamav.net (IP: 2606:4700::6810:da54)
Nov 26 11:38:37 mailkvm-21 freshclam[6693]: Trying host db.cn.clamav.net (2606:4700::6810:db54)...
Nov 26 11:38:37 mailkvm-21 freshclam[6693]: nonblock_connect: connect(): fd=5 errno=101: Network is unreachable
Nov 26 11:38:37 mailkvm-21 freshclam[6693]: Can't connect to port 80 of host db.cn.clamav.net (IP: 2606:4700::6810:db54)
Nov 26 11:38:37 mailkvm-21 freshclam[6693]: getpatch: Can't download daily-24577.cdiff from db.cn.clamav.net
Nov 26 11:38:37 mailkvm-21 freshclam[6693]: Incremental update failed, trying to download daily.cvd
Nov 26 11:38:37 mailkvm-21 freshclam[6693]: nonblock_connect: connect(): fd=5 errno=101: Network is unreachable
Nov 26 11:38:37 mailkvm-21 freshclam[6693]: Can't connect to port 80 of host db.cn.clamav.net (IP: 2606:4700::6810:db54)
Nov 26 11:38:50 mailkvm-21 freshclam[6693]: Downloading daily.cvd [100%]
Nov 26 11:40:23 mailkvm-21 freshclam[6693]: daily.cvd updated (version: 25644, sigs: 2008453, f-level: 63, builder: raynman)
Nov 26 11:40:27 mailkvm-21 clamd[5714]: SelfCheck: Database modification detected. Forcing reload.
Nov 26 11:40:28 mailkvm-21 clamd[5714]: Reading databases from /var/lib/clamav
Nov 26 11:40:42 mailkvm-21 freshclam[6693]: Downloading bytecode-320.cdiff [100%]
Nov 26 11:40:44 mailkvm-21 freshclam[6693]: Downloading bytecode-321.cdiff [100%]
Nov 26 11:40:44 mailkvm-21 freshclam[6693]: Downloading bytecode-322.cdiff [100%]
Nov 26 11:40:45 mailkvm-21 freshclam[6693]: Downloading bytecode-323.cdiff [100%]
Nov 26 11:40:46 mailkvm-21 freshclam[6693]: Downloading bytecode-324.cdiff [100%]
Nov 26 11:40:46 mailkvm-21 freshclam[6693]: Downloading bytecode-325.cdiff [100%]
Nov 26 11:40:47 mailkvm-21 freshclam[6693]: Downloading bytecode-326.cdiff [100%]
Nov 26 11:40:48 mailkvm-21 freshclam[6693]: Downloading bytecode-327.cdiff [100%]
Nov 26 11:40:48 mailkvm-21 freshclam[6693]: Downloading bytecode-328.cdiff [100%]
Nov 26 11:40:49 mailkvm-21 freshclam[6693]: Downloading bytecode-329.cdiff [100%]
Nov 26 11:40:50 mailkvm-21 freshclam[6693]: Downloading bytecode-330.cdiff [100%]
Nov 26 11:40:51 mailkvm-21 freshclam[6693]: Downloading bytecode-331.cdiff [100%]
Nov 26 11:40:53 mailkvm-21 freshclam[6693]: bytecode.cld updated (version: 331, sigs: 94, f-level: 63, builder: anvilleg)
Nov 26 11:41:07 mailkvm-21 freshclam[6693]: Database updated (6573449 signatures) from db.cn.clamav.net (IP: 104.16.219.84)
Nov 26 11:42:17 mailkvm-21 clamd[5714]: Database initialization error: can't compile engine: Malformed database
Nov 26 11:42:18 mailkvm-21 clamd[5714]: Terminating because of a fatal error.
Nov 26 11:42:18 mailkvm-21 clamd[5714]: Pid file removed.
Nov 26 11:42:18 mailkvm-21 clamd[5714]: --- Stopped at Tue Nov 26 11:42:18 2019
Nov 26 11:42:18 mailkvm-21 clamd[5714]: Socket file removed.
Nov 26 14:02:35 mailkvm-21 clamd[10607]: Received 0 file descriptor(s) from systemd.
Nov 26 14:02:35 mailkvm-21 clamd[10607]: clamd daemon 0.99.2 (OS: linux-gnu, ARCH: x86_64, CPU: x86_64)
Nov 26 14:02:35 mailkvm-21 clamd[10607]: Running as user clam (UID 104, GID 106)
Nov 26 14:02:35 mailkvm-21 clamd[10607]: Log file size limited to 4294967295 bytes.
Nov 26 14:02:35 mailkvm-21 clamd[10607]: Reading databases from /var/lib/clamav
Nov 26 14:02:35 mailkvm-21 clamd[10607]: Not loading PUA signatures.
Nov 26 14:02:35 mailkvm-21 clamd[10607]: Bytecode: Security mode set to "TrustSigned".
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紅色部分看樣子是資料庫初始化失敗，導致后面clamd啟動失敗。以前更新都沒有問題，就是從今年五月份以后開始出現。我又在另一臺機器重裝了一個同樣的系統，是KVM虛擬機，結果更新完了也是一樣。是不是現在新版的clamav資料庫都不支持舊版本的MySQL了？
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