[Qemu-devel] Misaligned memory writes on ARM and other runtime errors

[Stefan Weil]

When QEMU for ARM is compiled with sanitizers
(--extra-cflags=-fsanitize=address,undefined), I see runtime errors for
qemu-arm which indicate misaligned memory writes:

/qemu/linux-user/fd-trans.c:1389:18: runtime error: store to misaligned
address 0x42ff4b34 for type 'uint64_t', which requires 8 byte alignment

The full sanitizer report is available from
https://qemu.weilnetz.de/doc/sanitizer.txt. Some of the reported runtime
errors can easily be fixed, for example by replacing "1 << 31"
(currently 188 matches) by "1U << 31" (currently only 70 matches).

The test results are from running "arm-linux-user/qemu-arm
/usr/bin/scite" on Ubuntu ARM, but running other binaries with qemu-arm
shows similar runtime errors.

Regards,
Stefan Weil