Since commit 975af797f1e helper_fist_ST0() sets float_flag_invalid.
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https://bugs.launchpad.net/bugs/1920602
Title:
QEMU crash after a QuickBASIC program integer overflow
Status in QEMU:
Confirmed
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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