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+
+qemu guest crashes on spice client USB redirected device removal
+
+Hello,
+
+I am experiencing guest crashes, which cannot be reproduced at all times, but are pretty frequent (4 out of 5 tries it would crash). The guest crashes when a previously attached USB redirected device through SPICE has been removed by the client.
+
+Steps to reproduce:
+1.) Start windows 10 guest with display driver Spice
+2.) Connect to the console with remote-viewer spice://IP:PORT or via virt-viewer (tunnelled through SSH)
+3.) Attach a client USB device, for example storage device, iPhone or Android phone
+4.) Observe the guest OS detects it and sets it up
+5.) Go back to 'USB device selection' and untick the USB device
+6.) Observe the guest VM crashed and the below assertion was printed in the qemu log for this virtual machine:
+
+qemu-system-x86_64: /var/tmp/portage/app-emulation/qemu-4.0.0-r3/work/qemu-4.0.0/hw/usb/core.c:720: usb_ep_get: Assertion `dev != NULL' failed.
+2019-06-17 09:25:09.160+0000: shutting down, reason=crashed
+
+
+Versions of related packages on the host:
+app-emulation/qemu-4.0.0-r3
+app-emulation/spice-0.14.0-r2:0
+app-emulation/spice-protocol-0.12.14:0
+net-misc/spice-gtk-0.35:0
+Kernel: 5.1.7-gentoo on Intel x86_64 CPU
+
+Version of the spice-tools on the guest:
+virtio-win 0.1-126
+QXL 0.1-21
+mingw-vdagent-win 0.8.0
+
+QEMU command line (generated by libvirt):
+
+/usr/bin/qemu-system-x86_64 -name guest=W10VM,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-41-W10VM/master-key.aes -machine pc-i440fx-2.12,accel=kvm,usb=off,vmport=off,dump-guest-core=off -cpu qemu64,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff,hv_synic,hv_stimer -m 4500 -realtime mlock=off -smp 2,maxcpus=4,sockets=4,cores=1,threads=1 -uuid b39afae2-5085-4659-891c-b3c65e65af2e -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=26,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime,driftfix=slew -no-hpet -global kvm-pit.lost_tick_policy=delay -no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot menu=off,strict=on -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5 -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1 -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2 -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x8 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 -drive file=/libvirt/images/W10VM.qcow2,format=qcow2,if=none,id=drive-scsi0-0-0-1,cache=unsafe,discard=unmap,detect-zeroes=unmap -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=1,device_id=drive-scsi0-0-0-1,drive=drive-scsi0-0-0-1,id=scsi0-0-0-1,bootindex=1,write-cache=on -netdev tap,fd=28,id=hostnet0,vhost=on,vhostfd=29 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:44:f6:21,bus=pci.0,addr=0x3 -chardev spicevmc,id=charchannel0,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0 -chardev socket,id=charchannel1,fd=30,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=3,chardev=charchannel1,id=channel1,name=org.qemu.guest_agent.0 -chardev spiceport,id=charchannel2,name=org.spice-space.webdav.0 -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel2,id=channel2,name=org.spice-space.webdav.0 -spice port=5901,addr=0.0.0.0,seamless-migration=on -device qxl-vga,id=video0,ram_size=134217728,vram_size=134217728,vram64_size_mb=0,vgamem_mb=64,max_outputs=1,bus=pci.0,addr=0x2 -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev spicevmc,id=charredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=1 -chardev spicevmc,id=charredir1,name=usbredir -device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=on
+
+
+I have attempted to collect a backtrace, but will need direction as I am not sure on which thread to listen and where to set the breakpoint, 'thread apply all backtrace' does not seem to work well with the qemu process...
+
+Thank you
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