[Qemu-devel] [PATCH 0/2] avoid a hotplug operation leading migration's source side abort

[Li Zhijian]

qemu migration's source side will exit unexpectedly when we hotplug a deivce
during a migration is processing.
we can reproduced it easily by following step
1. do something with dirty memory requently(like memtester) in guest
2. startup a background migraion with '-d' option
3. hotplug a device(device_add e1000,id=mye1000)
4. stop step.1, let guest idle so that migration can complete fastly

something unexpectedly occurs like below:
*** Error in `/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64': 
free(): invalid pointer: 0x00007fff5c010b20 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x7d1fd)[0x7ffff5ad41fd]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x1e29c2)[0x5555557369c2]
/lib64/libglib-2.0.so.0(g_free+0xf)[0x7ffff6aaa5af]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x139454)[0x55555568d454]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x13a232)[0x55555568e232]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x13a2f1)[0x55555568e2f1]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0xec914)[0x555555640914]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0xc7e7e)[0x55555561be7e]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0xc7f0f)[0x55555561bf0f]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0xf01c9)[0x5555556441c9]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x3541d4)[0x5555558a81d4]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x3a5cf6)[0x5555558f9cf6]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x3b5809)[0x555555909809]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x3a6067)[0x5555558fa067]
/lib64/libglib-2.0.so.0(g_main_context_dispatch+0x15a)[0x7ffff6aa49ba]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x3b3c6f)[0x555555907c6f]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x3b3d4c)[0x555555907d4c]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x3b3e0b)[0x555555907e0b]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x1df701)[0x555555733701]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x1e6fed)[0x55555573afed]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7ffff5a78af5]
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64(+0x93729)[0x5555555e7729]
======= Memory map: ========
555555554000-555555b04000 r-xp 00000000 08:04 14111744                   
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64
555555d03000-555555dcc000 r--p 005af000 08:04 14111744                   
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64
555555dcc000-555555e42000 rw-p 00678000 08:04 14111744                   
/home/lizj/workspace/qemu/x86_64-softmmu/qemu-system-x86_64
555555e42000-55555affc000 rw-p 00000000 00:00 0                          [heap]
snip...

Li Zhijian (2):
  migration: protect migration_bitmap
  migration: extend migration_bitmap

 exec.c                  |  7 ++++++-
 include/exec/exec-all.h |  1 +
 migration/ram.c         | 41 +++++++++++++++++++++++++++++++++++------
 3 files changed, 42 insertions(+), 7 deletions(-)

-- 
2.1.4