x86: 0.988
virtual: 0.978
architecture: 0.950
graphic: 0.891
performance: 0.869
device: 0.848
semantic: 0.829
register: 0.825
hypervisor: 0.813
files: 0.804
network: 0.793
arm: 0.792
ppc: 0.773
PID: 0.770
VMM: 0.746
user-level: 0.741
mistranslation: 0.737
i386: 0.706
socket: 0.692
vnc: 0.687
peripherals: 0.661
risc-v: 0.660
kernel: 0.645
debug: 0.642
boot: 0.630
permissions: 0.623
TCG: 0.598
assembly: 0.587
KVM: 0.446

address_space_stw_le_cached: Assertion `addr < cache->len && 2 <= cache ->len - addr' failed

When running OpenBSD-current as a guest, the following assertion is hit after a few seconds, resulting in the virtual machine to crash:

```
qemu-system-x86_64: /build/qemu/src/qemu-3.0.0/include/exec/memory_ldst_cached.inc.h:85: address_space_stw_le_cached: Assertion `addr < cache->len && 2 <= cache->len - addr' failed.
```

Host is Arch Linux stable, running on x86_64.

Qemu version is 3.0.0, installed via the standard Arch Linux package.

Version 2.12.1 didn't exhibit this behavior.

Do you know how to use "git bisect"? If so, could you maybe try to bisect which commit between v2.12.0 and v3.0.0 introduced this problem?

I suspect this is a known bug, fixed in master in commit db812c4073c77. You could test that by cherry-picking it to 3.0 or just testing against master.



In the absence of further information from the submitter, it seems reasonable to assume that this is indeed the bug fixed by commit db812c4073c77 (which resulted in this assertion when running OpenBSD guests). That commit is in 3.1, which was released in December.