J'avais une erreur dans mon syslog sous forme :
mysqld: [ERROR] Got error 127 when reading table './<db>/<table>'

J'ai résolu le problème avec un

mysqlcheck --auto-repair <db> -u <user> -p

Enter password:
<db>.<table>
warning : Table is marked as crashed
error : Record at pos: 926124 is not remove-marked
error : record delete-link-chain corrupted
error : Corrupt

Repairing tables
<db>.<table>
info : Wrong block with wrong total length starting at 10668
warning : Number of rows changed from 342 to 340
status : OK

tail -n2 /var/log/syslog

Jan 20 16:33:00 WEB mysqld: 140120 16:33:00 [ERROR] Got error 127 when reading table './<db>/<table>'
Jan 20 16:33:47 WEB mysqld: 140120 16:33:47 [Note] Found 340 of 342 rows when repairing './<db>/<table>'