Re: internal-error inferior_thread(): Assertion `tp' failed

On 2017-04-20 12:07, Luke Dalessandro wrote:
> To reproduce using two shells:
> 
> <shell 1>
> 
> $ cat hello.cpp
> #include <iostream>
> #include <thread>
> using namespace std;
> int main() {
>   thread([](){ cout << "hello world\n”; }).join();
>   return 0;
> }
> 
> $ g++ -pthread -o hello hello.cpp
> 
> $ ./hello
> hello world
> 
> $ valgrind --vgdb-error=0 ./hello
> ==10408== Memcheck, a memory error detector
> ==10408== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et 
> al.
> ==10408== Using Valgrind-3.13.0.SVN and LibVEX; rerun with -h for 
> copyright info
> ==10408== Command: ./hello
> ==10408==
> ==10408== (action at startup) vgdb me ...
> ==10408==
> ==10408== TO DEBUG THIS PROCESS USING GDB: start GDB like this
> ==10408==   /path/to/gdb ./hello
> ==10408== and then give GDB the following command
> ==10408==   target remote |
> /u/ldalessa/.local/modules/valgrind/HEAD/lib/valgrind/../../bin/vgdb
> --pid=10408
> ==10408== --pid is optional if only one valgrind process is running
> ==10408==
> 
> <shell 2>
> 
> $ gdb ./hello
> GNU gdb (GDB) 8.0.50.20170420-git
> Copyright (C) 2017 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later 
> <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show 
> copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-pc-linux-gnu".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
> <http://www.gnu.org/software/gdb/documentation/>.
> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from ./hello...(no debugging symbols found)…done.
> 
> (gdb) target remote |
> /u/ldalessa/.local/modules/valgrind/HEAD/lib/valgrind/../../bin/vgdb
> --pid=10408
> Remote debugging using |
> /u/ldalessa/.local/modules/valgrind/HEAD/lib/valgrind/../../bin/vgdb
> --pid=10408
> relaying data between gdb and process 10408
> warning: remote target does not support file transfer, attempting to
> access files from local filesystem.
> Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols
> from /usr/lib/debug//lib/x86_64-linux-gnu/ld-2.19.so...done.
> done.
> 0x00000000040012d0 in _start () from /lib64/ld-linux-x86-64.so.2
> 
> (gdb) c
> Continuing.
> thread.c:100: internal-error: thread_info* inferior_thread():
> Assertion `tp' failed.
> A problem internal to GDB has been detected,
> further debugging may prove unreliable.
> Quit this debugging session? (y or n) y
> 
> This is a bug, please report it.  For instructions, see:
> <http://www.gnu.org/software/gdb/bugs/>.
> 
> thread.c:100: internal-error: thread_info* inferior_thread():
> Assertion `tp' failed.
> A problem internal to GDB has been detected,
> further debugging may prove unreliable.
> Create a core file of GDB? (y or n) y
> Aborted (core dumped)

I've tried those steps and the program runs to completion normally.

I am using valgrind-3.10.1 and 8.0.50.20170420-git.

> If this is really a bug I can just report along with the gdb stack
> trace via bugzilla. I just wanted to verify that there’s not something
> obvious on my end that would cause this.

An internal error from GDB is always a bug.  If you could report it in 
bugzilla with as much details as you can, it would be appreciated.

Thanks!

Simon