Comment 13 for bug 1886318

In that case please disregard those patches. Can you try this diff below which will log any invalid accesses and see if anything appears on stderr?

diff --git a/memory.c b/memory.c
index 9200b20130..5d1a6d4477 100644
--- a/memory.c
+++ b/memory.c
@@ -1354,10 +1354,12 @@ bool memory_region_access_valid(MemoryRegion *mr,
 {
     if (mr->ops->valid.accepts
         && !mr->ops->valid.accepts(mr->opaque, addr, size, is_write, attrs)) {
+ fprintf(stderr, "invalid accepts: %s addr %"PRIx64 " size: %d\n", mr->name, addr, size);
         return false;
     }

     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
+ fprintf(stderr, "invalid aligned: %s addr %"PRIx64 " size: %d\n", mr->name, addr, size);
         return false;
     }

@@ -1368,6 +1370,7 @@ bool memory_region_access_valid(MemoryRegion *mr,

     if (size > mr->ops->valid.max_access_size
         || size < mr->ops->valid.min_access_size) {
+ fprintf(stderr, "invalid size: %s addr %"PRIx64 " size: %d\n", mr->name, addr, size);
         return false;
     }
     return true;

ATB,

Mark.