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Bug 878700 - Segmentation fault when do live migration with remote-viewer + usb-redir (seamless-migration=on)
Summary: Segmentation fault when do live migration with remote-viewer + usb-redir (sea...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: spice-server
Version: 6.4
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Yonit Halperin
QA Contact: Desktop QE
URL:
Whiteboard:
Depends On:
Blocks: 881827
TreeView+ depends on / blocked
 
Reported: 2012-11-21 02:12 UTC by Sibiao Luo
Modified: 2013-07-03 12:14 UTC (History)
25 users (show)

Fixed In Version: spice-server-0.12.0-5.el6
Doc Type: Bug Fix
Doc Text:
No documentation is needed. This bug is related to a new feature: spice seamless migration. It was found and fixed during RHEL-6.4 development phase.
Clone Of:
Environment:
Last Closed: 2013-02-21 10:03:52 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2013:0529 0 normal SHIPPED_LIVE spice-server bug fix and enhancement update 2013-02-20 21:51:04 UTC

Description Sibiao Luo 2012-11-21 02:12:59 UTC 
Description of problem:
this bug was fond from bug 868766.
boot a guest with usb-redir (seamless-migration=on) and do dd to the usb disk in loop, then do live migration with 'remote-viewer spice://$host_ip:$port' to connect guest desktop, it will segmentation fault in destination qemu after the source qemu finish migration.

Version-Release number of selected component (if applicable):
host info:
kernel-2.6.32-342.el6.x86_64
qemu-kvm-0.12.1.2-2.334.el6.x86_64
virt-viewer-0.5.2-16.el6.x86_64
spice-gtk-0.14-5.el6.x86_64
guest info:
kernel-2.6.32-342.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1.boot guest with usb-redir and seamless-migration=on in src and '-incoming tcp:0:5888' in dst, the debug=4.
2.Connect guest desktop with remote-viewer tools (provided by virt-viewer)
3.plug a USB disk to USB host, and click on menubar -> 'File' -> 'USB Device selection'.
4.mkfs.ext4 the the usb-disk and mount it to /mnt.
5.do I/O to the mount target.
# cat script.sh 
while true
do
  dd if=/dev/zero of=/mnt/sluo bs=1M count=100
  rm -f /mnt/sluo
done
6.do live migrate
(qemu) __com.redhat_spice_migrate_info $dst_host_ip $dst_host_port
(qemu) migrate -d tcp:$dst_host_ip:$port

Actual results:
after the step 6, it the destination qemu segmentation fault after the source qemu finish migration.
(qemu) info status 
VM status: paused (incoming-migration)
(qemu) 
main_channel_link: add main channel client
red_dispatcher_set_cursor_peer: 
inputs_connect: inputs channel client create
qemu-kvm: usb-redir: chardev open

qemu-kvm: usb-redir: removing 0 packet-ids from cancelled queue

qemu-kvm: usb-redir: removing 0 packet-ids from already-in-flight queue

qemu-kvm: usb-redir: creating usbredirparser


Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffecb9fc700 (LWP 8487)]
0x00007ffff5f64b52 in display_channel_client_restore_surface (dcc=0x7fffec618010, surface_id=4158075104) at red_worker.c:9754
9754	        spice_assert(!dcc->surface_client_created[surface_id]);

(gdb) bt
#0  0x00007ffff5f64b52 in display_channel_client_restore_surface (dcc=0x7fffec618010, surface_id=4158075104) at red_worker.c:9754
#1  0x00007ffff5f672df in display_channel_client_restore_surfaces_lossy (rcc=0x7fffec618010, size=<value optimized out>, message=<value optimized out>) at red_worker.c:9782
#2  display_channel_handle_migrate_data (rcc=0x7fffec618010, size=<value optimized out>, message=<value optimized out>) at red_worker.c:9866
#3  0x00007ffff5f5a8df in red_channel_handle_migrate_data (rcc=0x7fffec618010, size=1040, type=<value optimized out>, message=0x7ffec421d208) at red_channel.c:1157
#4  red_channel_client_handle_message (rcc=0x7fffec618010, size=1040, type=<value optimized out>, message=0x7ffec421d208) at red_channel.c:1189
#5  0x00007ffff5f5a1eb in red_peer_handle_incoming (rcc=0x7fffec618010) at red_channel.c:272
#6  red_channel_client_receive (rcc=0x7fffec618010) at red_channel.c:294
#7  0x00007ffff5f5aa7c in red_channel_client_event (fd=<value optimized out>, event=<value optimized out>, data=0x7fffec618010) at red_channel.c:1204
#8  0x00007ffff5f7f86e in red_worker_main (arg=<value optimized out>) at red_worker.c:11782
#9  0x00007ffff773c851 in start_thread () from /lib64/libpthread.so.0
#10 0x00007ffff57fc90d in clone () from /lib64/libc.so.6
(gdb) q

Expected results:
it should have no any core dump, it can migration correctly.

Additional info:
my qemu-kvm commands line,
# /usr/libexec/qemu-kvm -M rhel6.4.0 -cpu SandyBridge -enable-kvm -m 4096 -smp 4,sockets=2,cores=2,threads=1 -name sluo_migration -uuid 990ea161-6b67-47b2-b803-19fb01d30d30 -rtc base=localtime,clock=host,driftfix=slew -drive file=/dev/vg-90.100-sluo/lv-90-100-RHEL6.4-20121019.0-Copy-x86_64,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,werror=stop,rerror=stop -device virtio-blk-pci,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=virtio-net-pci0,mac=08:2E:5F:0A:0D:B1,bus=pci.0,addr=0x4 -spice port=5931,disable-ticketing,seamless-migration=on -vga qxl -global qxl-vga.vram_size=67108864 -readconfig /mnt/ich9-ehci-uhci.cfg -chardev spicevmc,name=usbredir,id=usbredirchardev1 -device usb-redir,chardev=usbredirchardev1,id=usbredirdev1,bus=ehci.0,debug=4 -boot menu=on -monitor stdio
Comment 2 Yonit Halperin 2012-11-26 17:09:00 UTC 
The backtrace suggests a memory corruption (surface_id=4158075104). I have fixed upstream a memory corruption that occurred in the display channel due to display channel migration data that is larger than 1024 bytes. Such a scenario is more likely to happen on a low bandwidth connection + several off screen surfaces existing.
It is not directly related to usb.
Comment 7 errata-xmlrpc 2013-02-21 10:03:52 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0529.html
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