qemu: uncaught target signal 5 (Trace/breakpoint trap)
Description of problem:
I'm getting core dumped when running the attached a.out_err binary in qemu, but when using Gdb to remote-debug the program, it exited normally. will appreciate if you can help look into this qemu issue.

And I found that QEMU's 32-bit arm linux-user mode doesn't correctly turn guest BKPT insns into SIGTRAP signal.

0xa602 <_start>         movs    r0, #22   
                                                                                                                           0xa604 <_start+2>       addw    r1, pc, #186    ; 0xba                                                                                                                                           
0xa608 <_start+6>       bkpt    0x00ab       

$readelf -h hello

ELF Header:
  Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00  
  Class:                             ELF32  
  Data:                              2's complement, little endian  
  Version:                           1 (current)    
  OS/ABI:                            UNIX - System V  
  ABI Version:                       0  
  Type:                              EXEC (Executable file)  
  Machine:                           ARM  
  Version:                           0x1  
  Entry point address:               0xa603  
  Start of program headers:          52 (bytes into file)  
  Start of section headers:          144128 (bytes into file)  
  Flags:                             0x5000200, Version5 EABI, soft-float ABI  
  Size of this header:               52 (bytes)  
  Size of program headers:           32 (bytes)  
  Number of program headers:         5  
  Size of section headers:           40 (bytes)  
  Number of section headers:         16  
  Section header string table index: 14  

And I have check that the bug(https://bugs.launchpad.net/qemu/+bug/1873898) is fixed.

But it's coredump.

I found that bkpt instruction is not recognized, the bkpt is in 0x0000a608.

host：
```
$qemu-arm -g 12345 hello  
```
service:
```
$gdb-multiarch hello  
(gdb) target remote localhost:12345  
Remote debugging using localhost:12345  
0x0000a602 in _start ()  
(gdb) ni  
0x0000a604 in _start ()
(gdb)  
0x0000a608 in _start ()
(gdb)  
0x0000a608 in _start ()
```
Another way to check:
```
$gdb qemu-arm
(gdb) run hello
(gdb) bt
#0  0x00007ffff79474ba in __GI___sigsuspend (set=set@entry=0x7fffffffd9d8) at ../sysdeps/unix/sysv/linux/sigsuspend.c:26
#1  0x000055555573bfff in dump_core_and_abort (target_sig=target_sig@entry=5) at ../linux-user/signal.c:772
#2  0x000055555573c3c8 in handle_pending_signal (cpu_env=cpu_env@entry=0x555555da5940, sig=sig@entry=5, k=k@entry=0x555555e60e00) at ../linux-user/signal.c:1099
#3  0x000055555573de8c in process_pending_signals (cpu_env=cpu_env@entry=0x555555da5940) at ../linux-user/signal.c:1175
#4  0x0000555555622070 in cpu_loop (env=0x555555da5940) at ../linux-user/arm/cpu_loop.c:472
#5  0x0000555555603cf4 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at ../linux-user/main.c:883
(gdb) up
#1  0x000055555573bfff in dump_core_and_abort (target_sig=target_sig@entry=5) at ../linux-user/signal.c:772
772         sigsuspend(&act.sa_mask);
(gdb)
#2  0x000055555573c3c8 in handle_pending_signal (cpu_env=cpu_env@entry=0x555555da5940, sig=sig@entry=5, k=k@entry=0x555555e60e00) at ../linux-user/signal.c:1099
1099            dump_core_and_abort(sig);
(gdb)
#3  0x000055555573de8c in process_pending_signals (cpu_env=cpu_env@entry=0x555555da5940) at ../linux-user/signal.c:1175
1175                handle_pending_signal(cpu_env, sig, &ts->sync_signal);
(gdb)
#4  0x0000555555622070 in cpu_loop (env=0x555555da5940) at ../linux-user/arm/cpu_loop.c:472
472             process_pending_signals(env);
(gdb) l
467             default:
468             error:
469                 EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
470                 abort();
471             }
472             process_pending_signals(env);
473         }
474     }
475
476     void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
(gdb) p cpu_exec(cs)
$2 = 7
```
Here process_pending_signals(env) gives SIGTRAP??

Here is my binary:
[hello](/uploads/7225e1f1c5a61ace40f90d5d2401a758/hello)