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[Bug 1920602] Re: QEMU crash after a QuickBASIC program integer overflow


From: Aaro Koskinen
Subject: [Bug 1920602] Re: QEMU crash after a QuickBASIC program integer overflow
Date: Sat, 20 Mar 2021 13:14:42 -0000

** Description changed:

- A trivial program compiler with QuickBASIC 4.5 with integer overflow
+ A trivial program compiled with QuickBASIC 4.5 with integer overflow
  will crash QEMU when ran under MS-DOS 5.0 or FreeDOS 1.2:
  
- C:\KILLER>type killer.bas                                                     
  
- A% = VAL("99999"):PRINT A%                                                    
  
-                                                                               
  
- C:\KILLER>killer.exe                                                          
  
- **                                                                            
  
-   ERROR:../qemu-5.2.0/accel/tcg/tcg-cpus.c:541:tcg_handle_interrupt: 
assertion failed: (qemu_mutex_iothread_locked())                                
           
+ C:\KILLER>type killer.bas
+ A% = VAL("99999"):PRINT A%
+ 
+ C:\KILLER>killer.exe
+ **
+   ERROR:../qemu-5.2.0/accel/tcg/tcg-cpus.c:541:tcg_handle_interrupt: 
assertion failed: (qemu_mutex_iothread_locked())
  Aborted
  
  QEMU version v5.2, compiler for ARM, and started with command line:
  
  qemu-system-i386 -curses -cpu 486 -m 1 -drive dos.img
  
  The same test under Ubuntu QEMU and KVM/x86_64 (QEMU emulator version
  4.2.1 (Debian 1:4.2-3ubuntu6.14)) will just silently hang the QEMU. On
  DOSBOX, the machine does not die and program outputs the value -31073.
  
  The EXE to reproduce the issue is attached.

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https://bugs.launchpad.net/bugs/1920602

Title:
  QEMU crash after a QuickBASIC program integer overflow

Status in QEMU:
  New

Bug description:
  A trivial program compiled with QuickBASIC 4.5 with integer overflow
  will crash QEMU when ran under MS-DOS 5.0 or FreeDOS 1.2:

  C:\KILLER>type killer.bas
  A% = VAL("99999"):PRINT A%

  C:\KILLER>killer.exe
  **
    ERROR:../qemu-5.2.0/accel/tcg/tcg-cpus.c:541:tcg_handle_interrupt: 
assertion failed: (qemu_mutex_iothread_locked())
  Aborted

  QEMU version v5.2, compiler for ARM, and started with command line:

  qemu-system-i386 -curses -cpu 486 -m 1 -drive dos.img

  The same test under Ubuntu QEMU and KVM/x86_64 (QEMU emulator version
  4.2.1 (Debian 1:4.2-3ubuntu6.14)) will just silently hang the QEMU. On
  DOSBOX, the machine does not die and program outputs the value -31073.

  The EXE to reproduce the issue is attached.

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