[Qemu-devel] qemu is freezing in rebooting after CPU hot-unplug.

[Qemu-devel] qemu is freezing in rebooting after CPU hot-unplug.

[Paulo Vital]

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Hi

I'm doing some tests on CPU hot-unplug using as base the mentioned patch
set in [1] and I'm facing some problems while executing a reboot (via
'shutdown -r now' command in guest's command line or QMP system_reset
command) after unplug one CPU. After execute (2 times) the loop related to
reset the system on main_loop_should_exit(), looks like qemu continues
executing the main_loop() but the system, itself, freezes!

If I request to reboot using the guest command line (shutdown -r now), the
guest runs the normal OS reset processes but doesn't restart. If I request
by QMP command, I qemu executes all reset process but the guest didn't run
the OS guest process.

I'd like to know where I can debug during the reset process. By what I
could debug, the flow looks normal, but I guess something is missing :-D

[1] https://lists.nongnu.org/archive/html/qemu-devel/2014-08/msg00072.html

Thanks in advance.
---
Paulo Vital

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Re: [Qemu-devel] qemu is freezing in rebooting after CPU hot-unplug.

[Paulo Vital]

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Hello.
Any advice for this issue?

---
Paulo Vital


On Fri, Jan 9, 2015 at 3:14 PM, Paulo Vital <paulo.vital@profitbricks.com>
wrote:

> Hi
>
> I'm doing some tests on CPU hot-unplug using as base the mentioned patch
> set in [1] and I'm facing some problems while executing a reboot (via
> 'shutdown -r now' command in guest's command line or QMP system_reset
> command) after unplug one CPU. After execute (2 times) the loop related to
> reset the system on main_loop_should_exit(), looks like qemu continues
> executing the main_loop() but the system, itself, freezes!
>
> If I request to reboot using the guest command line (shutdown -r now), the
> guest runs the normal OS reset processes but doesn't restart. If I request
> by QMP command, I qemu executes all reset process but the guest didn't run
> the OS guest process.
>
> I'd like to know where I can debug during the reset process. By what I
> could debug, the flow looks normal, but I guess something is missing :-D
>
> [1] https://lists.nongnu.org/archive/html/qemu-devel/2014-08/msg00072.html
>
> Thanks in advance.
> ---
> Paulo Vital
>
>

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Re: [Qemu-devel] qemu is freezing in rebooting after CPU hot-unplug.

[Igor Mammedov]

On Fri, 9 Jan 2015 15:14:34 +0100
Paulo Vital <paulo.vital@profitbricks.com> wrote:

> Hi
> 
> I'm doing some tests on CPU hot-unplug using as base the mentioned patch
> set in [1] and I'm facing some problems while executing a reboot (via
> 'shutdown -r now' command in guest's command line or QMP system_reset
> command) after unplug one CPU. After execute (2 times) the loop related to
> reset the system on main_loop_should_exit(), looks like qemu continues
> executing the main_loop() but the system, itself, freezes!
> 
> If I request to reboot using the guest command line (shutdown -r now), the
> guest runs the normal OS reset processes but doesn't restart. If I request
> by QMP command, I qemu executes all reset process but the guest didn't run
> the OS guest process.
> 
> I'd like to know where I can debug during the reset process. By what I
> could debug, the flow looks normal, but I guess something is missing :-D
> 
> [1] https://lists.nongnu.org/archive/html/qemu-devel/2014-08/msg00072.html
It's a bit outdated series, could you try with
http://lists.gnu.org/archive/html/qemu-devel/2015-01/msg01557.html
and its dependencies.

Please, CC me and author of that series so your posts won't drown
in total traffic of mail-list.

> 
> Thanks in advance.
> ---
> Paulo Vital