C++: PrintDebugString() causes core dump

[mberaha]

What version of protobuf and what language are you using?
Version: master
Language: C++

What operating system (Linux, Windows, ...) and version?
Linux, Ubuntu 18.04

What runtime / compiler are you using (e.g., python version or gcc version)
g++ v7.4.0

What did you do?
in file main.cpp

#include <google/protobuf/text_format.h>
#include <my_msg.pb.h>

int main() {
   MyMsg msg;
   msg.set_id(1);
   msg.PrintDebugString();
}

from the terminal

> /usr/bin/protoc --proto_path=./ --cpp_out=./ my_msg.proto
> c++ -g main.cpp my_msg.pb.cc `pkg-config --cflags g --libs protobuf`

The produced error is

terminate called after throwing an instance of 'std::system_error'
  what():  Unknown error -1
Aborted (core dumped)

Also, gdb didn't produce any better explanation.

At first it doesn't seem to me a problem of library mismatch since protoc an my executable al loading the same shared object

mario@mario-XPS:~$ ldd /usr/bin/protoc
	linux-vdso.so.1 (0x00007ffce0fdf000)
	libprotoc.so.22 => /usr/lib/libprotoc.so.22 (0x00007f0f454b8000)
	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f0f4512f000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f0f44f17000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f0f44cf8000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f0f44907000)
	libprotobuf.so.22 => /usr/lib/libprotobuf.so.22 (0x00007f0f4445c000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f0f45b6f000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f0f440be000)
	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f0f43ea1000)

mario@mario-XPS:~$ ldd ./main
	linux-vdso.so.1 (0x00007ffc2adfb000)
	libprotobuf.so.22 => /usr/lib/libprotobuf.so.22 (0x00007f4604b20000)
	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f4604797000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f460457f000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f460418e000)
	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f4603f71000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f46051da000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f4603bd3000)

Also, the same problem arises if I use any of the metod from TextFormat like PrintToString

[Riccardopeli]

I have just installed from master and got the same issue! Any fixes?

[rafi-kamal]

@gerben-s @haberman

[haberman]

I reproduced this and got the following stack trace:

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff76b88ad in __GI_abort () at abort.c:79
#2  0x00007ffff7ed1983 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3  0x00007ffff7ed78c6 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007ffff7ed7901 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x00007ffff7ed7b34 in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00007ffff7ed3a55 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#7  0x00005555555970c8 in std::call_once<void (&)(google::protobuf::internal::DescriptorTable const*), google::protobuf::internal::DescriptorTable const*&> (
    __once=...,
    __f=@0x5555555960e0: {void (const struct google::protobuf::internal::DescriptorTable *)} 0x5555555960e0 <google::protobuf::(anonymous namespace)::AssignDescriptorsImpl(google::protobuf::internal::
DescriptorTable const*)>, __args#0=@0x7fffffffddc8: 0x55555567de00 <descriptor_table_test_2eproto>)
    at /usr/include/x86_64-linux-gnu/c++/8/bits/gthr-default.h:699
#8  0x000055555558c8fe in google::protobuf::internal::AssignDescriptors (table=<optimized out>) at google/protobuf/generated_message_reflection.cc:2407
#9  0x000055555556c8ba in MyMessage::GetMetadataStatic () at test.pb.h:168
#10 0x000055555556bd3d in MyMessage::GetMetadata (this=0x7fffffffe040) at test.pb.cc:270
#11 0x00005555555b2103 in google::protobuf::Message::GetReflection (this=0x7fffffffe040) at ./google/protobuf/message.h:333
#12 google::protobuf::TextFormat::Printer::Print (this=0x7fffffffdf40, message=..., generator=0x7fffffffdec0) at google/protobuf/text_format.cc:1969
#13 0x00005555555b2946 in google::protobuf::TextFormat::Printer::Print (this=<optimized out>, message=..., output=<optimized out>)
    at google/protobuf/text_format.cc:1883
#14 0x00005555555b29a8 in google::protobuf::TextFormat::Printer::PrintToString (this=this@entry=0x7fffffffdf40, message=..., output=output@entry=0x7fffffffe000)
    at google/protobuf/text_format.cc:1867
#15 0x00005555555b2a04 in google::protobuf::Message::DebugString[abi:cxx11]() const (this=0x7fffffffe040) at google/protobuf/text_format.cc:90
#16 0x00005555555b2a74 in google::protobuf::Message::PrintDebugString (this=<optimized out>) at google/protobuf/text_format.cc:123
#17 0x000055555556b047 in main () at test.cc:7

Digging in now.

[haberman]

I think the problem is that the pthread library is not linked: https://stackoverflow.com/questions/51584960/stdcall-once-throws-stdsystem-error-unknown-error-1

If I change the command line above to add -lpthread at the end, it works.

[mberaha]

Thank you, it works!!