Bugs item #2725367, was opened at 2009-04-01 19:57
Message generated for change (Tracker Item Submitted) made by technologov
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Category: qemu
Group: None
Status: Open
Resolution: None
Priority: 8
Private: No
Submitted By: Technologov (technologov)
Assigned to: Nobody/Anonymous (nobody)
Summary: KVM userspace segfaults due to internal VNC server
Initial Comment:
KVM's internal VNC server is unstable.
When running KVM (KVM-84 or 85rc2), the userspace segfaults when I try to
connect to it with VNC client.
Only some VNC clients can trigger it. It happens on both Intel & AMD.
I used TightVNC 1.3 client for Linux 64-bit.
No problems happen with SDL rendering.
Host: Intel Core 2 CPU, KVM-85rc2, Fedora 7 x64
Guest: Windows XP SP2 32-bit
The Command sent to Qemu/KVM:
/usr/local/bin/qemu-system-x86_64 -m 256 -monitor
tcp:localhost:4502,server,nowait -cdrom /isos/windows/WindowsXP-sp2-vlk.iso
-hda /vm/winxp.qcow2 -name WindowsXP -vnc :1
GDB output:
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 46912498463376 (LWP 18803)]
0x0000000000438cfc in vga_draw_line24_32 (s1=<value optimized out>,
d=0x2aaabc822000 <Address 0x2aaabc822000 out of bounds>,
s=0x2aaabb3eeef7 "", width=36)
at /root/Linstall/kvm-85rc2/qemu/hw/vga_template.h:484
484 ((PIXEL_TYPE *)d)[0] = glue(rgb_to_pixel, PIXEL_NAME)(r, g, b);
(gdb) bt
#0 0x0000000000438cfc in vga_draw_line24_32 (s1=<value optimized out>,
d=0x2aaabc822000 <Address 0x2aaabc822000 out of bounds>,
s=0x2aaabb3eeef7 "", width=36)
at /root/Linstall/kvm-85rc2/qemu/hw/vga_template.h:484
#1 0x0000000000437b0d in vga_update_display (opaque=<value optimized out>)
at /root/Linstall/kvm-85rc2/qemu/hw/vga.c:1767
#2 0x0000000000490c45 in vnc_listen_read (opaque=0x2aaabb3eeef7) at vnc.c:2020
#3 0x00000000004093dc in main_loop_wait (timeout=<value optimized out>)
at /root/Linstall/kvm-85rc2/qemu/vl.c:3818
#4 0x000000000051724a in kvm_main_loop ()
at /root/Linstall/kvm-85rc2/qemu/qemu-kvm.c:588
#5 0x000000000040e28a in main (argc=13, argv=0x7fff25e77658,
envp=<value optimized out>) at /root/Linstall/kvm-85rc2/qemu/vl.c:3875
(gdb) c
Continuing.
Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.
(gdb)
The program is not being run.
-Alexey
----------------------------------------------------------------------
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