On Mon, Jul 30, 2018 at 3:34 PM 姚宗友 <yaozongyou@xxxxxxxxxx> wrote:
>
> Hi,
>
> Internally, we have a program using librados C++ api to periodiclly check ceph's cluster status and send alerts to our internal system.
> The little program is written using c++, and linked with librados and our base c++ library. The program works well with K version, but it core dumped with L version. Here is the minmum code to reproduce:
>
> #include <iostream>
> #include <rados/librados.hpp>
>
> // Thread class from our base library
> class Thread {
> public:
> Thread() {
> }
>
> };
>
> int main() {
> Thread t;
> librados::Rados cluster;
>
> int error_code = cluster.init2("client.admin", "ceph", /* flags = */0);
>
> // ... code omitted
>
> return 0;
> }
>
> # g++ -I/path/to/ceph/src/include ./test.cpp -L/path/to/ceph/build/lib -lrados
> # export LD_LIBRARY_PATH=/path/to/ceph/build/lib
> # ./a.out
>
> Here is backtrace for the coredump:
>
> ceph/src/log/Log.cc: In function 'void ceph::logging::Log::start()' thread 7f839ed72180 time 2018-07-30 14:55:58.340036
> ceph/src/log/Log.cc: 509: FAILED assert(!is_started())
> ceph version 14.0.0-1698-gcecbf3e (cecbf3e5dda2dc132367d6d5d74b1b384846c31a) nautilus (dev)
> 1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x14e) [0x7f83951305ce]
> 2: (()+0x2e8787) [0x7f8395130787]
> 3: (ceph::logging::Log::stop()+0) [0x7f839534b130]
> 4: (CephContext::CephContext(unsigned int, code_environment_t, int)+0x1bd7) [0x7f839513f677]
> 5: (common_preinit(CephInitParameters const&, code_environment_t, int)+0x4e) [0x7f83951677be]
> 6: (()+0x884aa) [0x7f839e9c54aa]
> 7: (rados_create2()+0xa8) [0x7f839e9c5888]
> 8: ./a.out() [0x400be4]
> 9: (__libc_start_main()+0xf5) [0x7f839dd02b35]
> 10: ./a.out() [0x400af9]
> Aborted
>
> The reason for the core dump is the Thread::Thread in our base c++ library conflicts with librados from ceph's common Thread https://github.com/ceph/ceph/blob/master/src/common/Thread.h#L41
> Both of them are in global namespace.
>
> Maybe we'd better put https://github.com/ceph/ceph/blob/master/src/common in ceph or rados namespace. Or build librados using -Wl,-Bsymbolic -Wl,-Bsymbolic-functions flag.
>
> Best wishes,
> Yao Zongyou
Zongyou, thanks for reporting this issue. could you help test
https://github.com/ceph/ceph/pull/23320?
--
Regards
Kefu Chai
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