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Re: [Qemu-devel][bug] qemu crash when migrate vm and vm's disks

From: Dr. David Alan Gilbert
Subject: Re: [Qemu-devel][bug] qemu crash when migrate vm and vm's disks
Date: Thu, 8 Apr 2021 12:27:01 +0100
User-agent: Mutt/2.0.6 (2021-03-06)

* Yuchen (yu.chen@h3c.com) wrote:
> When migrate vm and vm’s disks target host qemu crash due to an invalid free.
> #0  object_unref (obj=0x1000) at 
> /qemu-2.12/rpmbuild/BUILD/qemu-2.12/qom/object.c:920
> #1  0x0000560434d79e79 in memory_region_unref (mr=<optimized out>)
>     at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/memory.c:1730
> #2  flatview_destroy (view=0x560439653880) at 
> /qemu-2.12/rpmbuild/BUILD/qemu-2.12/memory.c:292
> #3  0x000056043514dfbe in call_rcu_thread (opaque=<optimized out>)
>     at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/util/rcu.c:284
> #4  0x00007fbc2b36fe25 in start_thread () from /lib64/libpthread.so.0
> #5  0x00007fbc2b099bad in clone () from /lib64/libc.so.6
> test base qemu-2.12.0,but use lastest qemu(v6.0.0-rc2) also reproduce.


> As follow patch can resolve this problem:
> https://lists.gnu.org/archive/html/qemu-devel/2018-07/msg02272.html

That's a pci/rcu change; ccing Paolo and Micahel.

> Steps to reproduce:
> (1) Create VM (virsh define)
> (2) Add 64 virtio scsi disks

Is that hot adding the disks later, or are they included in the VM at
Can you provide a libvirt XML example?

> (3) migrate vm and vm’disks

What do you mean by 'and vm disks' - are you doing a block migration?


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