[Bug gdb/22211] New: gdb 8.0.1 x86_64 thread.c:1123: internal-error: void finish_thread_state(ptid_t): Assertion `tp' failed.

["t at jujit dot su" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22211

            Bug ID: 22211
           Summary: gdb 8.0.1 x86_64 thread.c:1123: internal-error: void
                    finish_thread_state(ptid_t): Assertion `tp' failed.
           Product: gdb
           Version: 8.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: t at jujit dot su
  Target Milestone: ---

Created attachment 10485
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10485&action=edit
code and python script to reproduce

gdb 8.0.1 arch linux package

Linux 4.12.13-1-ARCH #1 SMP PREEMPT Fri Sep 15 06:36:43 UTC 2017 x86_64
GNU/Linux                                                                       

Code and script to reproduce: see attachment or
https://github.com/spacejam/gdb-bug

Description:
Two threads are run one at a time in non-stop mode until they reach a "stop"
breakpoint. Then we "run" and gdb crashes when in thread.c at
finish_thread_state 

Crash log:

GNU gdb (GDB) 8.0.1                                                             
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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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/>.
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For help, type "help".
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seeding with 752097355547
+file target/debug/race
warning: Missing auto-load script at offset 0 in section .debug_gdb_scripts
of file /home/t/src/gdb-bug/target/debug/race.
Use `info auto-load python-scripts [REGEXP]' to list them.
+set non-stop on
+set confirm off
+b src/main.rs:8                                                                
Breakpoint 1 at 0xf0f2: file src/main.rs, line 8.                               
+r                                                                              
[Thread debugging using libthread_db enabled]                                   
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7ffff6bff700 (LWP 20352)]                                         
[New Thread 0x7ffff69fe700 (LWP 20353)]                                         

Thread 2 "race" hit Breakpoint 1, race::bad_txn () at src/main.rs:8             
8           if A.load(SeqCst) == 0 {
(gdb) running schedule
+d
Breakpoint 2 at 0x5555555630f2: file src/main.rs, line 8.                       
Breakpoint 3 at 0x55555556312a: file src/main.rs, line 9.                       
Breakpoint 4 at 0x555555596e71: file /checkout/src/liballoc/boxed.rs, line 241. 
Breakpoint 5 at 0x55555556330a: file src/main.rs, line 12.                      
+t 2                                                                            
[Switching to thread 2 (Thread 0x7ffff6bff700 (LWP 20352))]
#0  race::bad_txn () at src/main.rs:8                                           
8           if A.load(SeqCst) == 0 {                                            
+c                                                                              
Selected thread is running.                                                     
(gdb) thread 2 hit breakpoint at src/main.rs:9                                  
+t 2                                                                            
[Switching to thread 2 (Thread 0x7ffff6bff700 (LWP 20352))]                     
#0  race::bad_txn () at src/main.rs:9                                           
9               A.fetch_add(10, SeqCst);                                        
+c                                                                              
Selected thread is running.                                                     
(gdb) success!                                                                  
+t 3                                                                            
[Switching to thread 3 (Thread 0x7ffff69fe700 (LWP 20353))]                     
#0  race::bad_txn () at src/main.rs:8                                           
8           if A.load(SeqCst) == 0 {                                            
+c                                                                              
Selected thread is running.                                                     
(gdb) restarting execution after running out of valid threads                   
+k                                                                              
+file target/debug/race                                                         
warning: Missing auto-load script at offset 0 in section .debug_gdb_scripts     
of file /home/t/src/gdb-bug/target/debug/race.
Use `info auto-load python-scripts [REGEXP]' to list them.
reseeding with 84716566159
+b src/main.rs:8
Breakpoint 6 at 0xf0f2: file src/main.rs, line 8.
+r
thread.c:1123: internal-error: void finish_thread_state(ptid_t): Assertion `tp'
failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.

This is a bug, please report it.  For instructions, see:
<http://www.gnu.org/software/gdb/bugs/>.

[1]    20343 abort (core dumped)  ./debug.py

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