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)
-- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1484925 Title: Segfault with custom vnc client Status in QEMU: New Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1484925/+subscriptions
