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device_add usb-hub causes segfault in qemu-1.0
When calling the command
(qemu) device_add usb-hub,bus=usb.0,port=4
qemu replies
Error: usb port 4 (bus usb.0) not found (in use?)
Then qemu crashes with a segfault:
[ 1546.177627] qemu-system-x86[1710]: segfault at 0 ip b75d3f8b sp bfddb0b0 error 6 in qemu-system-x86_64[b7488000+2e2000]
Maybe it might be related to the docs/usb2.txt where UHCI has only 2 ports. But a mistake in the port number should not cause qemu to crash
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