virtio devices often timeout (never receive interrupts) under guarded heap

[waddlesplash]

I built an image with the guarded heap enabled (USE_GUARDED_HEAP_FOR_MALLOC=1, USE_GUARDED_HEAP_FOR_OBJECT_CACHE=0). When booting it in QEMU with software emulation (no KVM), virtio-scsi and virtio-net often fail to initialize. Sometimes virtio-scsi will work but virtio-net will not; sometimes virtio-scsi will fail to initialize with these messages:

msix configured for 4 vectors
msi-x enabled: 0x8003
virtio_pci: using MSI-X count 4 starting at 24
virtio_scsi: wait failed with status: 0x80000009

(and thus the boot will fail.)

When the devices have failed to initialize, the interrupt count as displayed by "ints" always seems to be 0.

When not using the guarded heap, I haven't gotten equivalent failures yet. The fact that it only happens sometimes under the guarded heap sounds like it could be a race condition.

This is with current master and QEMU 7.0. QEMU invocation:

qemu-system-x86_64 -display sdl -m 4G -nic model=virtio -device virtio-scsi-pci -device scsi-hd,drive=x0 -drive file=haiku-minimum.image,format=raw,if=none,id=x0 -serial stdio -s