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[Qemu-devel] [Bug 1169375] Re: qemu.git master -> qemu segfaults during


From: Aurelien Jarno
Subject: [Qemu-devel] [Bug 1169375] Re: qemu.git master -> qemu segfaults during tcp migration (and other modes when using MALLOC_PERTURB_=1)
Date: Mon, 20 May 2013 17:31:21 -0000

** Changed in: qemu
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1169375

Title:
  qemu.git master -> qemu segfaults during tcp migration (and other
  modes when using MALLOC_PERTURB_=1)

Status in QEMU:
  Fix Released

Bug description:
  Relevant qemu.git master commit:

  24a6e7f4d91e9ed5f8117ecb083431a23f8609a0

  When trying to migrate a VM using the TCP protocol, a segfault
  happened:

  21:45:07 INFO | Running qemu command (reformatted):
  /home/lmr/Code/qemu/x86_64-softmmu/qemu-system-x86_64 \
      -S \
      -name 'virt-tests-vm1' \
      -nodefaults \
      -chardev 
socket,id=hmp_id_hmp1,path=/tmp/monitor-hmp1-20130415-214507-8fDeX7Fj,server,nowait
 \
      -mon chardev=hmp_id_hmp1,mode=readline \
      -chardev 
socket,id=serial_id_serial1,path=/tmp/serial-serial1-20130415-214507-8fDeX7Fj,server,nowait
 \
      -device isa-serial,chardev=serial_id_serial1 \
      -chardev 
socket,id=seabioslog_id_20130415-214507-8fDeX7Fj,path=/tmp/seabios-20130415-214507-8fDeX7Fj,server,nowait
 \
      -device 
isa-debugcon,chardev=seabioslog_id_20130415-214507-8fDeX7Fj,iobase=0x402 \
      -device ich9-usb-uhci1,id=usb1 \
      -drive 
file='/home/lmr/Code/virt-test.git/shared/data/images/jeos-17-64.qcow2',if=none,id=virtio0
 \
      -device virtio-blk-pci,drive=virtio0,bootindex=1 \
      -device 
virtio-net-pci,netdev=idr5RNof,mac='9a:42:43:44:45:46',id='idJVlBu3' \
      -netdev user,id=idr5RNof,hostfwd=tcp::5000-:22 \
      -m 1024 \
      -smp 2,maxcpus=2,cores=1,threads=1,sockets=2 \
      -cpu 'SandyBridge' \
      -M pc \
      -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \
      -vnc :1 \
      -vga std \
      -rtc base=utc,clock=host,driftfix=none  \
      -boot order=cdn,once=c,menu=off  \
      -enable-kvm \
      -incoming tcp:0:5200
  21:45:08 INFO | [qemu output] qemu-system-x86_64: -device 
usb-tablet,id=usb-tablet1,bus=usb1.0,port=1: Bus 'virtio-pci-bus.0' is full
  21:45:08 DEBUG| VM appears to be alive with PID 2002
  21:45:08 DEBUG| (monitor hmp1) Sending command 'info cpus' 
  21:45:08 DEBUG| (monitor hmp1) Response to 'info cpus'
  21:45:08 DEBUG| (monitor hmp1)    * CPU #0: pc=0x00000000fffffff0 
thread_id=2004
  21:45:08 DEBUG| (monitor hmp1)      CPU #1: pc=0x00000000fffffff0 
thread_id=2005
  21:45:09 DEBUG| (monitor hmp1) Sending command 'cont' 
  21:45:09 INFO | Migrating to tcp:0:5200
  21:45:09 DEBUG| (monitor hmp1) Sending command 'migrate -d tcp:0:5200' 
  21:45:10 WARNI| Could not find (qemu) prompt after command 'screendump 
/dev/shm/scrdump-MDE7wl.ppm'. Output so far: ''
  21:45:10 WARNI| VM 'virt-tests-vm1' produced an invalid screendump
  21:45:10 INFO | [qemu output] qemu: warning: error while loading state 
section id 3
  21:45:10 INFO | [qemu output] load of migration failed
  21:45:10 INFO | [qemu output] /bin/sh: line 1:  1867 Segmentation fault      
/home/lmr/Code/qemu/x86_64-softmmu/qemu-system-x86_64 -S -name 'virt-tests-vm1' 
-nodefaults -chardev 
socket,id=hmp_id_hmp1,path=/tmp/monitor-hmp1-20130415-214454-pGmRwNvs,server,nowait
 -mon chardev=hmp_id_hmp1,mode=readline -chardev 
socket,id=serial_id_serial1,path=/tmp/serial-serial1-20130415-214454-pGmRwNvs,server,nowait
 -device isa-serial,chardev=serial_id_serial1 -chardev 
socket,id=seabioslog_id_20130415-214454-pGmRwNvs,path=/tmp/seabios-20130415-214454-pGmRwNvs,server,nowait
 -device 
isa-debugcon,chardev=seabioslog_id_20130415-214454-pGmRwNvs,iobase=0x402 
-device ich9-usb-uhci1,id=usb1 -drive 
file='/home/lmr/Code/virt-test.git/shared/data/images/jeos-17-64.qcow2',if=none,id=virtio0
 -device virtio-blk-pci,drive=virtio0,bootindex=1 -device 
virtio-net-pci,netdev=id33wvth,mac='9a:42:43:44:45:46',id='idavPVhj' -netdev 
user,id=id33wvth,hostfwd=tcp::5001-:22 -m 1024 -smp 
2,maxcpus=2,cores=1,threads=1,so:

  We've missed those problems during the last couple of weeks due to
  problems in our test grid. The problem can be seen running the default
  test set on virt-test. By default, virt-test does not use
  MALLOC_PERTURB_=1. When using MALLOC_PERTURB_=1, pretty much all
  migration modes will fail.

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