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Posted to dev@brpc.apache.org by GitBox <gi...@apache.org> on 2020/09/06 06:52:18 UTC
[GitHub] [incubator-brpc] wasphin commented on issue #1227: Fork 子进程后死锁在 pthread_atfork
wasphin commented on issue #1227:
URL: https://github.com/apache/incubator-brpc/issues/1227#issuecomment-687711837
A reproducible example.
file: ``echo.cc``
```c++
#include <boost/process.hpp>
#include <iostream>
int main(int, char*[]) {
namespace bp = boost::process;
bp::ipstream out;
bp::child echo(bp::search_path("echo"), "hello, world!", bp::std_out > out);
std::string line;
while (out && std::getline(out, line) && !line.empty())
std::cout << line << std::endl;
echo.wait();
return 0;
}
```
Without ``brpc``:
```
$ g++ fork.cc -lboost_system -lboost_filesystem -pthread
$ ./a.out
hello, world!
```
With ``brpc``:
```
$ g++ fork.cc -lbrpc -lboost_system -lboost_filesystem -pthread
$ ldd a.out
linux-vdso.so.1 (0x00007f2f8597b000)
libbrpc.so => /lib64/libbrpc.so (0x00007f2f84530000)
libboost_system.so.1.66.0 => /lib64/libboost_system.so.1.66.0 (0x00007f2f8432b000)
libboost_filesystem.so.1.66.0 => /lib64/libboost_filesystem.so.1.66.0 (0x00007f2f84110000)
libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f2f83d7b000)
libm.so.6 => /lib64/libm.so.6 (0x00007f2f839f9000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f2f837e1000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f2f835c1000)
libc.so.6 => /lib64/libc.so.6 (0x00007f2f831ff000)
libgflags.so.2.1 => /lib64/libgflags.so.2.1 (0x00007f2f82fd8000)
libprotobuf.so.15 => /lib64/libprotobuf.so.15 (0x00007f2f82adb000)
libleveldb.so.1 => /lib64/libleveldb.so.1 (0x00007f2f82877000)
libprotoc.so.15 => /lib64/libprotoc.so.15 (0x00007f2f823b9000)
libcrypto.so.1.1 => /lib64/libcrypto.so.1.1 (0x00007f2f81ed6000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f2f81cd2000)
libz.so.1 => /lib64/libz.so.1 (0x00007f2f81abb000)
libssl.so.1.1 => /lib64/libssl.so.1.1 (0x00007f2f81827000)
librt.so.1 => /lib64/librt.so.1 (0x00007f2f8161e000)
/lib64/ld-linux-x86-64.so.2 (0x00007f2f85755000)
libsnappy.so.1 => /lib64/libsnappy.so.1 (0x00007f2f81414000)
$ ./a.out
```
```
$ pgrep a.out
28877
28879
$ pstack 28877
Thread 2 (Thread 0x7fd3aa239700 (LWP 28878)):
#0 0x00007fd3ac0ed238 in nanosleep () from /lib64/libc.so.6
#1 0x00007fd3ac118d78 in usleep () from /lib64/libc.so.6
#2 0x00007fd3ad53e322 in bvar::detail::SamplerCollector::run (this=0x1ac9600) at /usr/src/debug/brpc-0.9.7-1.el8.x86_64/src/bvar/detail/sampler.cpp:174
#3 0x00007fd3ad53ee29 in bvar::detail::SamplerCollector::sampling_thread (arg=<optimized out>) at /usr/src/debug/brpc-0.9.7-1.el8.x86_64/src/bvar/detail/sampler.cpp:103
#4 0x00007fd3ac3ef2de in start_thread () from /lib64/libpthread.so.0
#5 0x00007fd3ac120e83 in clone () from /lib64/libc.so.6
Thread 1 (Thread 0x7fd3ae76f9c0 (LWP 28877)):
#0 0x00007fd3ac3f8b94 in read () from /lib64/libpthread.so.0
#1 0x000000000041318c in boost::process::detail::posix::executor<boost::fusion::joint_view<boost::fusion::tuple<boost::process::detail::posix::exe_cmd_init<char> >, boost::fusion::filter_view<boost::fusion::tuple<boost::filesystem::path&, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1>&> const, boost::process::detail::is_initializer<mpl_::arg<-1> > > > >::_read_error(int) ()
#2 0x0000000000411a67 in boost::process::detail::posix::executor<boost::fusion::joint_view<boost::fusion::tuple<boost::process::detail::posix::exe_cmd_init<char> >, boost::fusion::filter_view<boost::fusion::tuple<boost::filesystem::path&, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1>&> const, boost::process::detail::is_initializer<mpl_::arg<-1> > > > >::invoke(mpl_::bool_<false>, mpl_::bool_<false>) ()
#3 0x000000000041025d in boost::process::detail::posix::executor<boost::fusion::joint_view<boost::fusion::tuple<boost::process::detail::posix::exe_cmd_init<char> >, boost::fusion::filter_view<boost::fusion::tuple<boost::filesystem::path&, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1>&> const, boost::process::detail::is_initializer<mpl_::arg<-1> > > > >::operator()() ()
#4 0x000000000040eb57 in boost::process::child boost::process::detail::basic_execute_impl<char, boost::filesystem::path, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1> >(boost::filesystem::path&&, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1>&&) ()
#5 0x000000000040cbd9 in boost::process::child boost::process::detail::execute_impl<boost::filesystem::path, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1> >(boost::filesystem::path&&, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1>&&) ()
#6 0x000000000040b1c8 in boost::process::child::child<boost::filesystem::path, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1> >(boost::filesystem::path&&, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1>&&) ()
#7 0x0000000000405a9f in main ()
$ pstack 28879
Thread 2 (Thread 0x7fd3aa239700 (LWP 28880)):
#0 0x00007fd3ac0ed238 in nanosleep () from /lib64/libc.so.6
#1 0x00007fd3ac118d78 in usleep () from /lib64/libc.so.6
#2 0x00007fd3ad53e322 in bvar::detail::SamplerCollector::run (this=0x1ac9600) at /usr/src/debug/brpc-0.9.7-1.el8.x86_64/src/bvar/detail/sampler.cpp:174
#3 0x00007fd3ad53ee29 in bvar::detail::SamplerCollector::sampling_thread (arg=<optimized out>) at /usr/src/debug/brpc-0.9.7-1.el8.x86_64/src/bvar/detail/sampler.cpp:103
#4 0x00007fd3ac3ef2de in start_thread () from /lib64/libpthread.so.0
#5 0x00007fd3ac120e83 in clone () from /lib64/libc.so.6
Thread 1 (Thread 0x7fd3ae76f9c0 (LWP 28879)):
#0 0x00007fd3ac12e58c in __lll_lock_wait_private () from /lib64/libc.so.6
#1 0x00007fd3ac12e772 in __register_atfork () from /lib64/libc.so.6
#2 0x00007fd3ad53ec17 in bvar::detail::SamplerCollector::create_sampling_thread (this=0x1ac9600) at /usr/src/debug/brpc-0.9.7-1.el8.x86_64/src/bvar/detail/sampler.cpp:91
#3 bvar::detail::SamplerCollector::after_forked_as_child (this=0x1ac9600) at /usr/src/debug/brpc-0.9.7-1.el8.x86_64/src/bvar/detail/sampler.cpp:97
#4 bvar::detail::SamplerCollector::child_callback_atfork () at /usr/src/debug/brpc-0.9.7-1.el8.x86_64/src/bvar/detail/sampler.cpp:82
#5 0x00007fd3ac12eb10 in __run_fork_handlers () from /lib64/libc.so.6
#6 0x00007fd3ac0ed38c in fork () from /lib64/libc.so.6
#7 0x00000000004117c9 in boost::process::detail::posix::executor<boost::fusion::joint_view<boost::fusion::tuple<boost::process::detail::posix::exe_cmd_init<char> >, boost::fusion::filter_view<boost::fusion::tuple<boost::filesystem::path&, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1>&> const, boost::process::detail::is_initializer<mpl_::arg<-1> > > > >::invoke(mpl_::bool_<false>, mpl_::bool_<false>) ()
#8 0x000000000041025d in boost::process::detail::posix::executor<boost::fusion::joint_view<boost::fusion::tuple<boost::process::detail::posix::exe_cmd_init<char> >, boost::fusion::filter_view<boost::fusion::tuple<boost::filesystem::path&, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1>&> const, boost::process::detail::is_initializer<mpl_::arg<-1> > > > >::operator()() ()
#9 0x000000000040eb57 in boost::process::child boost::process::detail::basic_execute_impl<char, boost::filesystem::path, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1> >(boost::filesystem::path&&, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1>&&) ()
#10 0x000000000040cbd9 in boost::process::child boost::process::detail::execute_impl<boost::filesystem::path, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1> >(boost::filesystem::path&&, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1>&&) ()
#11 0x000000000040b1c8 in boost::process::child::child<boost::filesystem::path, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1> >(boost::filesystem::path&&, char const (&) [14], boost::process::detail::posix::pipe_out<1, -1>&&) ()
#12 0x0000000000405a9f in main ()
```
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