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

[Aaro Koskinen]

The program works (in TCQ mode) with QEMU v5.0.0.

QEMU starts crashing with the commit:

commit 975af797f1e04e4d1b1a12f1731141d3770fdbce
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri May 15 21:21:24 2020 +0000

    target/i386: fix IEEE x87 floating-point exception raising

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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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