MySQL Bugs: #75909: [ERROR] Invalid (old?) table or database name

Bug #75909	[ERROR] Invalid (old?) table or database name
Submitted:	15 Feb 2015 20:16	Modified:	16 Feb 2015 6:04
Reporter:	Roel Van de Paar	Email Updates:
Status:	Duplicate	Impact on me:	None
Category:	MySQL Server: DML	Severity:	S2 (Serious)
Version:	5.7.5-m15	OS:	Any
Assigned to:		CPU Architecture:	Any

Description:
2015-02-15T20:14:35.538563Z 1 [ERROR] Invalid (old?) table or database name '-1'

How to repeat:
DROP DATABASE test;CREATE DATABASE test;USE test;
CREATE DATABASE `#mysql50#-1`;
select count(*) from information_schema.columns;

Check error log. Database can be used normally, but error appears.

Reproducible for me on Windows:

-- starting server with an empty error log file:

2015-02-15T21:50:40.779584Z 0 [Note] Plugin 'FEDERATED' is disabled.
2015-02-15T21:50:40.781584Z 0 [Note] InnoDB: Mutexes and rw_locks use Windows interlocked functions
2015-02-15T21:50:40.782585Z 0 [Note] InnoDB: Uses event mutexes
2015-02-15T21:50:40.782585Z 0 [Note] InnoDB: _mm_lfence() and _mm_sfence() are used for memory barrier
2015-02-15T21:50:40.783585Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.3
2015-02-15T21:50:40.784585Z 0 [Note] InnoDB: Number of pools: 1
2015-02-15T21:50:40.785585Z 0 [Note] InnoDB: Not using CPU crc32 instructions
2015-02-15T21:50:40.787585Z 0 [Note] InnoDB: Initializing buffer pool, total size = 1.0G, instances = 8, chunk size = 128.0M
2015-02-15T21:50:40.855589Z 0 [Note] InnoDB: Completed initialization of buffer pool
2015-02-15T21:50:40.877590Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2015-02-15T21:50:40.909592Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2015-02-15T21:50:40.909592Z 0 [Note] InnoDB: Setting file '.\ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2015-02-15T21:50:40.963595Z 0 [Note] InnoDB: File '.\ibtmp1' size is now 12 MB.
2015-02-15T21:50:40.964595Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2015-02-15T21:50:40.965595Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2015-02-15T21:50:40.966595Z 0 [Note] InnoDB: Waiting for purge to start
2015-02-15T21:50:41.016598Z 0 [Note] InnoDB: 5.7.5 started; log sequence number 2273756
2015-02-15T21:50:41.017598Z 0 [Warning] Failed to setup SSL
2015-02-15T21:50:41.017598Z 0 [Warning] SSL error: SSL context is not usable without certificate and private key
2015-02-15T21:50:41.018598Z 0 [Note] Server hostname (bind-address): '*'; port: 3311
2015-02-15T21:50:41.019598Z 0 [Note] IPv6 is available.
2015-02-15T21:50:41.019598Z 0 [Note]   - '::' resolves to '::';
2015-02-15T21:50:41.019598Z 0 [Note] Server socket created on IP: '::'.
2015-02-15T21:50:41.049600Z 0 [Note] Event Scheduler: Loaded 0 events
2015-02-15T21:50:41.050600Z 0 [Note] C:\Program Files\MySQL\MySQL Server 5.7\bin\mysqld: ready for connections.
Version: '5.7.5-m15-log'  socket: ''  port: 3311  MySQL Community Server (GPL)

-- after executing the statements provided by Roel this gets added to the log.

2015-02-15T21:51:51.865650Z 1 [ERROR] Invalid (old?) table or database name '-1'

Hello Roel,

Thank you for the report.
imho this is duplicate of Bug #73920

Thanks,
Umesh