device: 0.823
performance: 0.649
semantic: 0.636
files: 0.594
ppc: 0.573
network: 0.558
graphic: 0.548
mistranslation: 0.517
architecture: 0.486
user-level: 0.478
peripherals: 0.461
boot: 0.425
debug: 0.380
permissions: 0.359
PID: 0.358
x86: 0.314
socket: 0.299
i386: 0.285
TCG: 0.271
register: 0.250
VMM: 0.243
vnc: 0.207
arm: 0.193
risc-v: 0.188
KVM: 0.145
kernel: 0.125
assembly: 0.101
hypervisor: 0.097
virtual: 0.033

trace_usb_port_attach prints junk data

Running qemu with tracing (-D ~/qemu_trace -d trace:\*) will result in a trace file with unprintable characters.

example: usb_port_attach bus 0, port 1, devspeed <90>l<DB>.<D8>U, portspeed full+high

The problem is in hw/usb/bus.c usb_mask_to_str. If speedmask doesn't match any of the defined speed nothing is written to *dest and uninitialized data is printed to the log.

This happens with a real usb device that is forwarded into the machine.

My qemu version is 2.6.0 but it looks like the problem exists in latest git also.

This bug is still present in current head of git; I've just sent a patch: http://patchwork.ozlabs.org/patch/1068196/


Patch has been included here:
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=5189e30b146ab39f9d