OSS-Fuzz never picked up on this one, so I'm guessing it was fixed sometime
between 5.1 and 5.2.
Not a fun section to bisect, but looks like it was fixed by 21bc31524e ("hw:
xhci: check return value of 'usb_packet_map'")
--
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https://bugs.launchpad.net/bugs/1883728
Title:
address_space_unmap: Assertion `mr != NULL' failed.
Status in QEMU:
Incomplete
Bug description:
To reproduce run the QEMU with the following command line:
```
qemu-system-x86_64 -cdrom hypertrash_os_bios_crash.iso -nographic -m 100
-enable-kvm -device virtio-gpu-pci -device nec-usb-xhci -device usb-audio
```
QEMU Version:
```
# qemu-5.0.0
$ ./configure --target-list=x86_64-softmmu --enable-sanitizers; make
$ x86_64-softmmu/qemu-system-x86_64 --version
QEMU emulator version 5.0.0
Copyright (c) 2003-2020 Fabrice Bellard and the QEMU Project developers
```
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