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+graphic: 0.703
+vnc: 0.516
+semantic: 0.486
+network: 0.458
+architecture: 0.425
+performance: 0.409
+socket: 0.390
+hypervisor: 0.382
+debug: 0.380
+user-level: 0.325
+ppc: 0.321
+register: 0.309
+device: 0.287
+mistranslation: 0.268
+boot: 0.250
+kernel: 0.249
+peripherals: 0.222
+permissions: 0.221
+virtual: 0.217
+risc-v: 0.215
+PID: 0.204
+arm: 0.193
+assembly: 0.181
+files: 0.164
+x86: 0.154
+TCG: 0.152
+i386: 0.119
+VMM: 0.079
+KVM: 0.026
+
+Segfault with custom vnc client
+
+Hey,
+
+I'm using Citrix XenServer 6.5. I worte a script that uses noVNC to connect to the rfb console via xapi. When I use GRML and try to boot it, the QEMU process segfaults and kills my VM. This happens when the screen resizes and the kernel is loading:
+
+recvfrom(3, "\3\1\0\0\0\0\2\200\1\220\3\0\2\200\0\0\0P\1\220", 4096, 0, NULL, NULL) = 20
+--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0xb28000} ---
+
+I can see in the child process the following message, right before the parent Segfaults:
+read(4, "cirrus: blanking the screen line_offset=0 height=480\n", 53) = 53
+
+This issue only happens, when I have my custom php/novnc-client connected. I also tried the nodejs/novnc package from xen-orchestra - same result. Using the stock client from Citrix XenCenter it works just fine. So I think it is related to noVNC. I hope this is just a bug and not exploitable to force a VM to crash or execute code. 
+
+XenServer launches the qemu with the following command line:
+
+qemu-dm-25 --syslog -d 25 -m 2048 -boot dc -serial pty -vcpus 1 -videoram 4 -vncunused -k en-us -vnc 127.0.0.1:1 -usb -usbdevice tablet -net nic,vlan=0,macaddr=8a:43:e2:b1:57:df,model=rtl8139 -net tap,vlan=0,bridge=xenbr0,ifname=tap25.0 -acpi -monitor pty
+
+XenServer 6.5 is using the following version:
+# /usr/lib64/xen/bin/qemu-dm -help
+QEMU PC emulator version 0.10.2, Copyright (c) 2003-2008 Fabrice Bellard
+
+Greetings
+Uli Stärk
+
+Can you attach GDB to your qemu-dm process and attempt to capture a full stack trace when it crashes (ie thread apply all backtrace)
+
+
+Hi,
+
+Did you resolve your problem? Because I have the same issus..
+
+Dubravko
+
+No, sorry. I've stopped researching this issue.
+
+Dubravko:  can you get a good backtrace from your crash?
+
+Hi,
+
+Xen Orchestra project leader here. Exactly the same problem with noVNC + qemu-dm.
+
+I assume there is maybe an invalid param from noVNC somewhere, but crashing the process is not really expected.
+
+The bug is also reported at Citrix (see https://bugs.xenserver.org/browse/XSO-381)
+
+I don't know how to give you more info, if you have some commands to use to help you, tell me :)
+
+QEMU 0.10 is pretty much outdated nowadays... can you reproduce this issue with the latest version of QEMU, and if so, provide a backtrace of the crash?
+
+[Expired for QEMU because there has been no activity for 60 days.]
+