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Type:
Bug
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Resolution: Done
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Priority:
Minor - P4
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None
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Affects Version/s: 1.3.5
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Component/s: None
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None
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Environment:Mac OSX 10.11.4, Apple LLVM version 7.3.0 (clang-703.0.31), Mac Ports cyrus-sasl2 @2.1.26_6+kerberos, Mac Ports kerberos5 @1.14.2 (libkrb5.3.3)
In some configurations, the following sequence leads to the MIT Kerberos5 library being destroyed twice during process exit:
- process starts, loads libmongoc, which registers its auto-destructor
- libmongoc loads Cyrus, which loads its Kerberos plugin, which registers the Kerberos plugin auto-destructor
- main() exits
- the Kerberos plugin's auto-destructor runs
- libmongoc's auto-destructor calls sasl_client_done, which closes the Kerberos plugin shared lib
- closing the Kerberos plugin shared lib triggers its auto-destructor again
The solution for C programs is to configure the driver with ./configure --enable-automatic-init-and-cleanup=no and ensure they call mongoc_init and mongoc_cleanup explicitly. In version 2.0, the driver will remove the automatic init and cleanup feature.
Original report:
I found an assertion in kerberos originating in the C driver while testing the CXX driver master branch (commit 8dc0b5b). Backtrace follows:
$ lldb ./src/mongocxx/test/test_driver
(lldb) target create "./src/mongocxx/test/test_driver"
Current executable set to './src/mongocxx/test/test_driver' (x86_64).
(lldb) r
Process 47444 launched: './src/mongocxx/test/test_driver' (x86_64)
===============================================================================
All tests passed (903 assertions in 60 test cases)
Assertion failed: (r == 0), function k5_mutex_lock, file ../../include/k5-thread.h, line 384.
Process 47444 stopped
* thread #1: tid = 0x9686ee, 0x00007fff97fdaf06 libsystem_kernel.dylib`__pthread_kill + 10, queue = 'com.apple.main
-thread', stop reason = signal SIGABRT
frame #0: 0x00007fff97fdaf06 libsystem_kernel.dylib`__pthread_kill + 10
libsystem_kernel.dylib`__pthread_kill:
-> 0x7fff97fdaf06 <+10>: jae 0x7fff97fdaf10 ; <+20>
0x7fff97fdaf08 <+12>: movq %rax, %rdi
0x7fff97fdaf0b <+15>: jmp 0x7fff97fd57cd ; cerror_nocancel
0x7fff97fdaf10 <+20>: retq
(lldb) bt
* thread #1: tid = 0x9686ee, 0x00007fff97fdaf06 libsystem_kernel.dylib`__pthread_kill + 10, queue = 'com.apple.main
-thread', stop reason = signal SIGABRT
* frame #0: 0x00007fff97fdaf06 libsystem_kernel.dylib`__pthread_kill + 10
frame #1: 0x00007fff922b94ec libsystem_pthread.dylib`pthread_kill + 90
frame #2: 0x00007fff8cb626e7 libsystem_c.dylib`abort + 129
frame #3: 0x00007fff8cb29df8 libsystem_c.dylib`__assert_rtn + 321
frame #4: 0x0000000100879cd9 libkrb5support.1.1.dylib`krb5int_key_delete + 153
frame #5: 0x0000000100837c18 libgssapi_krb5.2.2.dylib`gss_krb5int_lib_fini + 26
frame #6: 0x000000010082b037 libgssapi_krb5.2.2.dylib`gssint_mechglue_fini + 40
frame #7: 0x00007fff5fc1329c dyld`ImageLoaderMachO::doTermination(ImageLoader::LinkContext const&) + 212
frame #8: 0x00007fff5fc01fee dyld`dyld::runImageStaticTerminators(ImageLoader*) + 206
frame #9: 0x00007fff5fc04d19 dyld`dyld::garbageCollectImages() + 720
frame #10: 0x00007fff5fc0c3df dyld`dlclose + 134
frame #11: 0x00007fff9b9d874d libdyld.dylib`dlclose + 61
frame #12: 0x00000001004938a1 libsasl2.dylib`_sasl_done_with_plugins + 46
frame #13: 0x000000010048b0cf libsasl2.dylib`sasl_common_done + 78
frame #14: 0x00000001004889fd libsasl2.dylib`sasl_client_done + 92
frame #15: 0x0000000100711062 libmongoc-1.0.0.dylib`_mongoc_do_cleanup + 18 at mongoc-init.c:130
frame #16: 0x00007fff922b6bf6 libsystem_pthread.dylib`__pthread_once_handler + 65
frame #17: 0x00007fff9d026fc4 libsystem_platform.dylib`_os_once + 41
frame #18: 0x00007fff922b6b95 libsystem_pthread.dylib`pthread_once + 57
frame #19: 0x000000010071103b libmongoc-1.0.0.dylib`mongoc_cleanup + 27 at mongoc-init.c:150
frame #20: 0x000000010071108e libmongoc-1.0.0.dylib`_mongoc_init_dtor + 14 at mongoc-init.c:170
frame #21: 0x00007fff5fc1329c dyld`ImageLoaderMachO::doTermination(ImageLoader::LinkContext const&) + 212
frame #22: 0x00007fff5fc0218b dyld`dyld::runAllStaticTerminators(void*) + 67
frame #23: 0x00007fff8cb6346b libsystem_c.dylib`__cxa_finalize_ranges + 345
frame #24: 0x00007fff8cb6376f libsystem_c.dylib`exit + 55
frame #25: 0x00007fff9b9d95b4 libdyld.dylib`start + 8
(lldb)
During libmongoc compilation, I did notice numerous warnings of the type: clang: warning: argument unused during compilation: '-pthread'
UPDATE: Moved libmongoc configuration output from "environment":
libbson 1.3.5 was configured with the following options: Build configuration: Enable debugging (slow) : yes Enable extra alignment (required for 1.0 ABI) : yes Compile with debug symbols (slow) : yes Enable GCC build optimization : no Enable automatic binary hardening : yes Code coverage support : no Cross Compiling : no Big endian : no Link Time Optimization (experimental) : no Documentation: man : no HTML : no libmongoc 1.3.5 was configured with the following options: Build configuration: Enable debugging (slow) : yes Compile with debug symbols (slow) : yes Enable GCC build optimization : no Enable automatic binary hardening : yes Enable automatic init and cleanup : yes Code coverage support : no Cross Compiling : no Fast counters : no Shared memory performance counters : yes SASL : sasl2 SSL : yes Libbson : bundled Documentation: man : no HTML : no
There's this warning that libraries should not call sasl_done:
Libraries should not call sasl_done(). Applications should exercise caution when calling sasl_done() to avoid interference with any libraries that might be using libsasl.
- is related to
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- Closed
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- related to
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- Closed
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- Closed
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CDRIVER-783 Add support for SASL plugins
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- Closed
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CDRIVER-1965 Improve warning when automatic ctor/dtor are enabled
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- Closed
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