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Re: (ITS#7896) macos issue with mdb_env_map
zxcvbn4038@gmail.com wrote:
> Full_Name: CJS
> Version: 0.9.14
> OS: MacOS 10.9.4
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (66.6.34.253)
>
>
> Under MacOS I have compiled lmdb 0.9.14, and I've found that anything using it
> reports resources unavailable the second time they try to use a database - this
> includes the test scripts. Make test output ends with:
Thanks for the report, fixed now in mdb.master
>
> key: 0x10ead7e7c 199 , data: 0x10ead7e80 199 409 foo bar
> mdb_env_open failed, error 16 Resource busy
> make: *** [test] Error 1
>
> I tracked down the problem to mdb.c, mdb_env_map function, line 3714.
>
> /* Can happen because the address argument to mmap() is just a
> * hint. mmap() can pick another, e.g. if the range is in use.
> * The MAP_FIXED flag would prevent that, but then mmap could
> * instead unmap existing pages to make room for the new map.
> */
> if (addr && env->me_map != addr)
> return EBUSY; /* TODO: Make a new MDB_* error code? */
>
> This expression always evaluates to true when opening an existing database, even
> with mdb_env_open is called without the MDB_FIXEDMAP flag, so the open always
> fails.
>
> If I commend that check out and rerun make test, it succeeds:
>
> key: 0x103580f84 240 , data: 0x103580f88 240 576 foo bar
> Status of Main DB
> Tree depth: 2
> Branch pages: 1
> Leaf pages: 3
> Overflow pages: 0
> Entries: 92
>
> My guess is that this is macos related or someone would have found it before me.
>
>
> Git blame shows this portion of the code hasn't changed in almost a year.
> However other parts of the same function have changed within the last year, so
> this could be a result of a recent change.
>
>
>
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/