mysql2
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Published
20 hours ago •
brianmario
brianmario
"Commands out of sync" (or segfault) when preparing and executing statements concurrently
I believe I might have discovered a bug.
When running the following code (on either v0.5.2 as well as on latest master, e.g., c8c346db72b5505740065d9de79b4a52081d5a57):
require "mysql2"
config = {
:adapter=>"mysql2",
:database=>"dunnolol",
:username=>"root",
:password=>"",
:host=>"localhost",
}
# This appears to "fix" it
#GC.disable
threads = []
10.times do |i|
threads << Thread.new do
mysql = Mysql2::Client.new(config)
query = "SELECT id FROM shops WHERE id = ?"
1000.times do
statement = mysql.prepare(query)
statement.execute(1)
# This also appears to "fix" it
#statement.close
end
end
end
threads.each(&:join)
I get the following exception:
3: from /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb:6:in `execute'
2: from /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb:6:in `handle_interrupt'
1: from /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb:7:in `block in execute'
/Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb:7:in `_execute': Commands out of sync; you can't run this command now (Mysql2::Error)
The problem does not appear (or at least not as often) when the mysql.prepare(query) is moved out of the 1000.times block.
Occasionally, this deadlocks or even segfaults my entire MRI process:
Segfault details
/Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb:7: [BUG] Segmentation fault at 0x0000000000000000
ruby 2.6.2p47 (2019-03-13 revision 67232) [x86_64-darwin18]
-- Crash Report log information --------------------------------------------
See Crash Report log file under the one of following:
* ~/Library/Logs/DiagnosticReports
* /Library/Logs/DiagnosticReports
for more details.
Don't forget to include the above Crash Report log file in bug reports.
-- Control frame information -----------------------------------------------
c:0008 p:---- s:0036 e:000035 CFUNC :_execute
c:0007 p:0021 s:0030 e:000029 BLOCK /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb:7 [FINISH]
c:0006 p:---- s:0027 e:000026 CFUNC :handle_interrupt
c:0005 p:0029 s:0022 e:000021 METHOD /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb:6
c:0004 p:0020 s:0016 e:000015 BLOCK test/unit/shit_test.rb:20 [FINISH]
c:0003 p:---- s:0011 e:000010 CFUNC :times
c:0002 p:0024 s:0007 e:000006 BLOCK test/unit/shit_test.rb:17 [FINISH]
c:0001 p:---- s:0003 e:000002 (none) [FINISH]
-- Ruby level backtrace information ----------------------------------------
/Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb:6:in `execute'
/Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb:6:in `handle_interrupt'
/Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb:7:in `block in execute'
/Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb:7:in `_execute'
-- Machine register context ------------------------------------------------
rax: 0x0000000000000000 rbx: 0x00007fc65b46b6e0 rcx: 0x0000000000001601
rdx: 0x0000000104f452ce rdi: 0x1000000000000000 rsi: 0x0000000104d6c037
rbp: 0x0000700008385a10 rsp: 0x00007000083859f0 r8: 0x00007fc65912e520
r9: 0x0000000000001600 r10: 0x0000000104c3e5c0 r11: 0x0000000104d6bd07
r12: 0x0000000000000000 r13: 0x0000000000000004 r14: 0x0000000104d6c037
r15: 0x1000000000000000 rip: 0x0000000104d2f75d rfl: 0x0000000000010206
-- C level backtrace information -------------------------------------------
/opt/rubies/2.6.2/bin/ruby(rb_vm_bugreport+0x82) [0x1027c3722]
/opt/rubies/2.6.2/bin/ruby(rb_bug_context+0x1d3) [0x102610653]
/opt/rubies/2.6.2/bin/ruby(sigsegv+0x51) [0x1027278d1]
/usr/lib/system/libsystem_platform.dylib(_sigtramp+0x1d) [0x7fff580a1b5d]
/usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib(sk_pop_free+0x15) [0x104d2f75d]
/usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib(0x104d6bcb4) [0x104d6bcb4]
/usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib(0x104d6bd1d) [0x104d6bd1d]
/usr/local/opt/openssl/lib/libssl.1.0.0.dylib(SSL_free+0x4d) [0x104c62700]
/usr/local/opt/mysql-client/lib/libmysqlclient.20.dylib(vio_ssl_delete+0x30) [0x104f2b3fa]
/usr/local/opt/mysql-client/lib/libmysqlclient.20.dylib(0x104f05569) [0x104f05569]
/usr/local/opt/mysql-client/lib/libmysqlclient.20.dylib(0x104f05956) [0x104f05956]
/usr/local/opt/mysql-client/lib/libmysqlclient.20.dylib(0x104f02ea1) [0x104f02ea1]
/Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/mysql2.bundle(rb_mysql_stmt_free+0x1d) [0x104eedc8d]
/opt/rubies/2.6.2/bin/ruby(finalize_list+0x50) [0x10263b300]
/opt/rubies/2.6.2/bin/ruby(gc_finalize_deferred+0x38) [0x10262bc48]
/opt/rubies/2.6.2/bin/ruby(rb_postponed_job_flush+0x156) [0x1027c8606]
/opt/rubies/2.6.2/bin/ruby(rb_threadptr_execute_interrupts+0x7c) [0x102765e6c]
/opt/rubies/2.6.2/bin/ruby(vm_call0_body+0x33e) [0x1027a71ae]
/opt/rubies/2.6.2/bin/ruby(rb_funcallv+0x270) [0x1027a5540]
/Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/mysql2.bundle(rb_mysql_stmt_execute+0xcc0) [0x104eeef90]
/opt/rubies/2.6.2/bin/ruby(vm_call_cfunc+0x161) [0x1027b6111]
/opt/rubies/2.6.2/bin/ruby(vm_exec_core+0x34bf) [0x10279c97f]
/opt/rubies/2.6.2/bin/ruby(rb_vm_exec+0xa6e) [0x1027b0b8e]
/opt/rubies/2.6.2/bin/ruby(rb_yield+0x9e) [0x1027a9dce]
/opt/rubies/2.6.2/bin/ruby(rb_thread_s_handle_interrupt+0x193) [0x10276af03]
/opt/rubies/2.6.2/bin/ruby(vm_call_cfunc+0x161) [0x1027b6111]
/opt/rubies/2.6.2/bin/ruby(vm_exec_core+0x320f) [0x10279c6cf]
/opt/rubies/2.6.2/bin/ruby(rb_vm_exec+0xa6e) [0x1027b0b8e]
/opt/rubies/2.6.2/bin/ruby(rb_yield_1+0x5e) [0x1027a9cfe]
/opt/rubies/2.6.2/bin/ruby(int_dotimes+0x118) [0x102698878]
/opt/rubies/2.6.2/bin/ruby(vm_call_cfunc+0x161) [0x1027b6111]
/opt/rubies/2.6.2/bin/ruby(vm_exec_core+0x320f) [0x10279c6cf]
/opt/rubies/2.6.2/bin/ruby(rb_vm_exec+0xa6e) [0x1027b0b8e]
/opt/rubies/2.6.2/bin/ruby(thread_do_start+0x31c) [0x10276dd1c]
/opt/rubies/2.6.2/bin/ruby(thread_start_func_2+0x1f6) [0x10276d6c6]
/opt/rubies/2.6.2/bin/ruby(thread_start_func_1+0x117) [0x10276d307]
/usr/lib/system/libsystem_pthread.dylib(_pthread_body+0x7e) [0x7fff580aa2eb]
/usr/lib/system/libsystem_pthread.dylib(0x7fff580ad249) [0x7fff580ad249]
-- Other runtime information -----------------------------------------------
* Loaded script: test/unit/shit_test.rb
* Loaded features:
0 enumerator.so
1 thread.rb
2 rational.so
3 complex.so
4 /opt/rubies/2.6.2/lib/ruby/2.6.0/x86_64-darwin18/enc/encdb.bundle
5 /opt/rubies/2.6.2/lib/ruby/2.6.0/x86_64-darwin18/enc/trans/transdb.bundle
6 /opt/rubies/2.6.2/lib/ruby/2.6.0/x86_64-darwin18/rbconfig.rb
7 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/compatibility.rb
8 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/defaults.rb
9 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/deprecate.rb
10 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/errors.rb
11 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/version.rb
12 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/requirement.rb
13 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/platform.rb
14 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/basic_specification.rb
15 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/stub_specification.rb
16 /opt/rubies/2.6.2/lib/ruby/2.6.0/delegate.rb
17 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri/rfc2396_parser.rb
18 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri/rfc3986_parser.rb
19 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri/common.rb
20 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri/generic.rb
21 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri/file.rb
22 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri/ftp.rb
23 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri/http.rb
24 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri/https.rb
25 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri/ldap.rb
26 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri/ldaps.rb
27 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri/mailto.rb
28 /opt/rubies/2.6.2/lib/ruby/2.6.0/uri.rb
29 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/specification_policy.rb
30 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/util/list.rb
31 /opt/rubies/2.6.2/lib/ruby/2.6.0/x86_64-darwin18/stringio.bundle
32 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/specification.rb
33 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/exceptions.rb
34 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/util.rb
35 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/bundler_version_finder.rb
36 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/dependency.rb
37 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/core_ext/kernel_gem.rb
38 /opt/rubies/2.6.2/lib/ruby/2.6.0/monitor.rb
39 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb
40 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/core_ext/kernel_warn.rb
41 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems.rb
42 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/path_support.rb
43 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/version.rb
44 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/core_ext/name_error.rb
45 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/levenshtein.rb
46 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/jaro_winkler.rb
47 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/spell_checker.rb
48 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
49 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
50 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/spell_checkers/name_error_checkers.rb
51 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/spell_checkers/method_name_checker.rb
52 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/spell_checkers/key_error_checker.rb
53 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/spell_checkers/null_checker.rb
54 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean/formatters/plain_formatter.rb
55 /opt/rubies/2.6.2/lib/ruby/gems/2.6.0/gems/did_you_mean-1.3.0/lib/did_you_mean.rb
56 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/version.rb
57 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/compatibility_guard.rb
58 /opt/rubies/2.6.2/lib/ruby/2.6.0/x86_64-darwin18/pathname.bundle
59 /opt/rubies/2.6.2/lib/ruby/2.6.0/pathname.rb
60 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/constants.rb
61 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/text.rb
62 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/user_interaction.rb
63 /opt/rubies/2.6.2/lib/ruby/2.6.0/x86_64-darwin18/etc.bundle
64 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/config_file.rb
65 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/rubygems_integration.rb
66 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/current_ruby.rb
67 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/shared_helpers.rb
68 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/fileutils/lib/fileutils.rb
69 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendored_fileutils.rb
70 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/errors.rb
71 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/environment_preserver.rb
72 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/plugin/api.rb
73 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/plugin.rb
74 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/source/git.rb
75 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/source/installed.rb
76 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/source/specific_file.rb
77 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/source/local.rb
78 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/source/lock.rb
79 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/source/vendor.rb
80 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/source.rb
81 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/gem_helpers.rb
82 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/match_platform.rb
83 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/rubygems_ext.rb
84 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/build_metadata.rb
85 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler.rb
86 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/settings.rb
87 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/yaml_serializer.rb
88 /opt/rubies/2.6.2/lib/ruby/2.6.0/rubygems/ext/builder.rb
89 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/feature_flag.rb
90 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/source.rb
91 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/source/path.rb
92 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/source/git.rb
93 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/source/rubygems.rb
94 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/lockfile_parser.rb
95 /opt/rubies/2.6.2/lib/ruby/2.6.0/set.rb
96 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/definition.rb
97 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/dependency.rb
98 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/ruby_dsl.rb
99 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/dsl.rb
100 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/source_list.rb
101 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/source/metadata.rb
102 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/ruby_version.rb
103 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/uri_credentials_filter.rb
104 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/lazy_specification.rb
105 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/index.rb
106 /opt/rubies/2.6.2/lib/ruby/2.6.0/tsort.rb
107 /opt/rubies/2.6.2/lib/ruby/2.6.0/forwardable/impl.rb
108 /opt/rubies/2.6.2/lib/ruby/2.6.0/forwardable.rb
109 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/spec_set.rb
110 /opt/rubies/2.6.2/lib/ruby/2.6.0/shellwords.rb
111 /opt/rubies/2.6.2/lib/ruby/2.6.0/fileutils/version.rb
112 /opt/rubies/2.6.2/lib/ruby/2.6.0/fileutils.rb
113 /opt/rubies/2.6.2/lib/ruby/2.6.0/tmpdir.rb
114 /opt/rubies/2.6.2/lib/ruby/2.6.0/tempfile.rb
115 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/source/git/git_proxy.rb
116 /opt/rubies/2.6.2/lib/ruby/2.6.0/x86_64-darwin18/digest.bundle
117 /opt/rubies/2.6.2/lib/ruby/2.6.0/digest.rb
118 /opt/rubies/2.6.2/lib/ruby/2.6.0/x86_64-darwin18/digest/sha1.bundle
119 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/compatibility.rb
120 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/gem_metadata.rb
121 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/delegates/specification_provider.rb
122 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/errors.rb
123 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/action.rb
124 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_edge_no_circular.rb
125 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_vertex.rb
126 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/delete_edge.rb
127 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb
128 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/set_payload.rb
129 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/tag.rb
130 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/log.rb
131 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/vertex.rb
132 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph.rb
133 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/state.rb
134 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/modules/specification_provider.rb
135 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/delegates/resolution_state.rb
136 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/resolution.rb
137 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/resolver.rb
138 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo/modules/ui.rb
139 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendor/molinillo/lib/molinillo.rb
140 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/vendored_molinillo.rb
141 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/resolver/spec_group.rb
142 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/resolver.rb
143 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/source/gemspec.rb
144 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/runtime.rb
145 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/dep_proxy.rb
146 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/ui.rb
147 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/ui/silent.rb
148 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/ui/rg_proxy.rb
149 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/remote_specification.rb
150 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/stub_specification.rb
151 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/endpoint_specification.rb
152 /Users/flo/.gem/ruby/2.6.2/gems/bundler-1.17.3/lib/bundler/setup.rb
153 /opt/rubies/2.6.2/lib/ruby/2.6.0/x86_64-darwin18/date_core.bundle
154 /opt/rubies/2.6.2/lib/ruby/2.6.0/date.rb
155 /opt/rubies/2.6.2/lib/ruby/2.6.0/x86_64-darwin18/bigdecimal.bundle
156 /opt/rubies/2.6.2/lib/ruby/2.6.0/bigdecimal.rb
157 /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/version.rb
158 /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/error.rb
159 /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/mysql2.bundle
160 /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/result.rb
161 /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/client.rb
162 /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/field.rb
163 /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2/statement.rb
164 /opt/rubies/2.6.2/lib/ruby/2.6.0/timeout.rb
165 /Users/flo/.gem/ruby/2.6.2/bundler/gems/mysql2-c8c346db72b5/lib/mysql2.rb
[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: https://www.ruby-lang.org/bugreport.html
[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.
The problem does not occur if the number of threads is changed to only 1.
Adding a GC.disable at the beginning of the file "fixes" the problem. Adding a statement.close after the statement.execute also appears to fix it. So my bet is that this has something to do with garbage collection of non-closed statements.
Thank you for the thorough report! Yes, your hypothesis sounds right on GC objects.
Hm. This looks like a multi-threaded version of https://github.com/brianmario/mysql2/issues/956 (which was supposedly fixed in https://github.com/brianmario/mysql2/pull/958, but maybe only for the single-threaded case?).