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mysql2.so doesn't link to proper libruby #657

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sorah opened this issue Aug 27, 2015 · 4 comments
Closed

mysql2.so doesn't link to proper libruby #657

sorah opened this issue Aug 27, 2015 · 4 comments

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@sorah
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sorah commented Aug 27, 2015

Assume both libruby and libmysqlclient are in system libdir (e.g. /usr/lib/x86_64-linux-gnu). When using another ruby installation (e.g. ruby with --enable-shared in rbenv), mysql2.so doesn't link to proper libruby:

$ ls -la /usr/lib/x86_64-linux-gnu/libruby.so /usr/lib/x86_64-linux-gnu/libmysqlclient.so
lrwxrwxrwx 1 root root 20 Oct 11  2014 /usr/lib/x86_64-linux-gnu/libmysqlclient.so -> libmysqlclient.so.18
lrwxrwxrwx 1 root root 40 Aug 25 07:35 /usr/lib/x86_64-linux-gnu/libruby.so -> libruby-2.2.so

$ ruby extconf.rb
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
checking for rb_thread_blocking_region()... no
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... yes
-----
Using mysql_config at /usr/bin/mysql_config
-----
checking for mysql.h... yes
checking for errmsg.h... yes
checking for mysqld_error.h... yes
-----
Setting libpath to /usr/lib/x86_64-linux-gnu
-----
creating Makefile

$ make V=1
gcc -I. -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0/x86_64-linux -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0/ruby/backward -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0 -I. -I/usr/include/mysql -DHAVE_RUBY_THREAD_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL -DHAVE_RB_WAIT_FOR_SINGLE_FD -DHAVE_RB_HASH_DUP -DHAVE_RB_INTERN3 -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H -I/usr/share/rbenv/versions/2.2.3/include    -fPIC  -O2 -march=native -mtune=native -ggdb3 -gdwarf-2 -fPIC -Wall -Wextra -Werror -Wno-unused-function -Wno-declaration-after-statement -Wno-missing-field-initializers  -o infile.o -c infile.c
gcc -I. -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0/x86_64-linux -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0/ruby/backward -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0 -I. -I/usr/include/mysql -DHAVE_RUBY_THREAD_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL -DHAVE_RB_WAIT_FOR_SINGLE_FD -DHAVE_RB_HASH_DUP -DHAVE_RB_INTERN3 -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H -I/usr/share/rbenv/versions/2.2.3/include    -fPIC  -O2 -march=native -mtune=native -ggdb3 -gdwarf-2 -fPIC -Wall -Wextra -Werror -Wno-unused-function -Wno-declaration-after-statement -Wno-missing-field-initializers  -o client.o -c client.c
gcc -I. -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0/x86_64-linux -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0/ruby/backward -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0 -I. -I/usr/include/mysql -DHAVE_RUBY_THREAD_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL -DHAVE_RB_WAIT_FOR_SINGLE_FD -DHAVE_RB_HASH_DUP -DHAVE_RB_INTERN3 -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H -I/usr/share/rbenv/versions/2.2.3/include    -fPIC  -O2 -march=native -mtune=native -ggdb3 -gdwarf-2 -fPIC -Wall -Wextra -Werror -Wno-unused-function -Wno-declaration-after-statement -Wno-missing-field-initializers  -o statement.o -c statement.c
gcc -I. -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0/x86_64-linux -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0/ruby/backward -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0 -I. -I/usr/include/mysql -DHAVE_RUBY_THREAD_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL -DHAVE_RB_WAIT_FOR_SINGLE_FD -DHAVE_RB_HASH_DUP -DHAVE_RB_INTERN3 -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H -I/usr/share/rbenv/versions/2.2.3/include    -fPIC  -O2 -march=native -mtune=native -ggdb3 -gdwarf-2 -fPIC -Wall -Wextra -Werror -Wno-unused-function -Wno-declaration-after-statement -Wno-missing-field-initializers  -o result.o -c result.c
gcc -I. -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0/x86_64-linux -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0/ruby/backward -I/usr/share/rbenv/versions/2.2.3/include/ruby-2.2.0 -I. -I/usr/include/mysql -DHAVE_RUBY_THREAD_H -DHAVE_RB_THREAD_CALL_WITHOUT_GVL -DHAVE_RB_WAIT_FOR_SINGLE_FD -DHAVE_RB_HASH_DUP -DHAVE_RB_INTERN3 -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H -I/usr/share/rbenv/versions/2.2.3/include    -fPIC  -O2 -march=native -mtune=native -ggdb3 -gdwarf-2 -fPIC -Wall -Wextra -Werror -Wno-unused-function -Wno-declaration-after-statement -Wno-missing-field-initializers  -o mysql2_ext.o -c mysql2_ext.c
rm -f mysql2.so
gcc -shared -o mysql2.so infile.o client.o statement.o result.o mysql2_ext.o -L/usr/lib/x86_64-linux-gnu -Wl,-R/usr/lib/x86_64-linux-gnu -L. -L/usr/share/rbenv/versions/2.2.3/lib -Wl,-R/usr/share/rbenv/versions/2.2.3/lib -L. -L/usr/share/rbenv/versions/2.2.3/lib  -fstack-protector -rdynamic -Wl,-export-dynamic    -Wl,-R/usr/share/rbenv/versions/2.2.3/lib -L/usr/share/rbenv/versions/2.2.3/lib -lruby -L/usr/lib/x86_64-linux-gnu -lmysqlclient -lpthread -lz -lm -ldl  -lpthread -lgmp -ldl -lcrypt -lm   -lc

$ ldd mysql2.so
        linux-vdso.so.1 =>  (0x00007fff4b5fe000)
        libruby-2.2.so.2.2 => /usr/lib/x86_64-linux-gnu/libruby-2.2.so.2.2 (0x00007fb0aafb5000)
        libmysqlclient.so.18 => /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 (0x00007fb0aaa7e000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fb0aa854000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fb0aa48f000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fb0aa28b000)
        libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 (0x00007fb0aa051000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fb0a9d4b000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fb0ab641000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fb0a9b32000)

Before 2.2.3 this kind of error isn't detected. But 2.2.3 introduced simple routine to make sure wrong libruby is being linked bugs.ruby-lang.org #11111:

$ ruby -v -r./mysql2.so -e0
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
/usr/share/rbenv/versions/2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require': incompatible library version - /home/.../mysql2/ext/mysql2/mysql2.so (LoadError)
        from /usr/share/rbenv/versions/2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'

The cause is specifying libdir into $LIBPATH explicitly:

# extconf.rb
$LIBPATH << libdir unless $LIBPATH.include?(libdir)

(I'm figuring out the smart fix...)
@sorah
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sorah commented Aug 27, 2015

Hm, Ruby 2.1.7 put libruby's directory more earlier on command line. Maybe ruby's bug?

@sorah
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sorah commented Aug 27, 2015

https://bugs.ruby-lang.org/issues/9760

@sorah
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sorah commented Aug 27, 2015

I think this is mkmf's bug. Close for a while...

@sorah sorah closed this as completed Aug 27, 2015
@daxadax daxadax mentioned this issue Jan 13, 2016
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@translunar translunar mentioned this issue Apr 6, 2016
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@defulmere
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I bumped into this problem a day or two ago while setting up an old Rails app with rvm.

I was able to work around it by temporarily denying access to the system ruby lib to the user who was using rvm, eg:

# as root
setfacl -m u:foo:--- /usr/lib64/libruby.so.2.6

# the user installs mysql2 in rvm, then as root again:

setfacl -x u:foo /usr/lib64/libruby.so.2.6

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@sorah @defulmere