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Qemu cmdline core dumped with more(8193 or more) cpus
---Debugger---
A debugger is not configured
---Steps to Reproduce---
---Problem Description---
Qemu cmdline core dumped with more(8193 or more) cpus
---Debugger---
A debugger is not configured
---Steps to Reproduce---
Qemu cmdline core dumped when more number of CPUs were given.
[root@ltcmihawk39 ~]# qemu-system-ppc64 -accel tcg -smp 10,maxcpus=9000
**
ERROR:../tcg/region.c:782:tcg_region_init: assertion failed: (region_size >= 2 * page_size)
Bail out! ERROR:../tcg/region.c:782:tcg_region_init: assertion failed: (region_size >= 2 * page_size)
Aborted (core dumped)
Expected Result:
Warning message like "Number of cpus requested exceeds the cpus supported"
Actual Result:
core dumped
Steps to Reproduce:
--------------------
1. Clone the upstream qemu from https://gitlab.com/qemu-project/qemu.git
2. Compile qemu with below steps.
cd qemu/
git submodule init
git submodule update --recursive
./configure --target-list=ppc64-softmmu --prefix=/usr
make
make install
3. set maxcpus=8193 or more
[root@ltcmihawk39 ~]# qemu-system-ppc64 --version
QEMU emulator version 8.0.94 (v8.1.0-rc4)
Copyright (c) 2003-2023 Fabrice Bellard and the QEMU Project developers
NOTE: This behavior is observed only when qemu is built without disabling the tcg.
Contact Information = <email address hidden>
Machine Type = x
---uname output---
x
Action needed
Our IBM Dev want to include this patch in latest Canonical distro.
Need the distro to review and integrate fixes provided by IBM
https://github.com/qemu/qemu/commit/c4f91d7b7be76c47015521ab0109c6e998a369b0
Need to include this commit in latest Canonical distro.
FWIW, this bug tracker is not used for qemu for a long time. See https://gitlab.com/qemu-project/qemu/ instead.
Hi Michael,
as I read it this is just for tracking the integration of the patch which is already upstream to go into Ubuntu - in that case the tracker is correct.
But it was wrong in the beginning, yet Frank fixed it and your comments raced.
@Frank maybe some teaching needed to have bugproxy open it in the right place to begin with?
quilt patch for commit c4f91d7b7be
This bug was fixed in the package qemu - 1:8.2.1+ds-1ubuntu8
---------------
qemu (1:8.2.1+ds-1ubuntu8) noble; urgency=medium
* d/p/u/lp2012763-maxcpus-too-low.patch: Actually set the max_cpus
property of the new Mantic machine types. (LP: #2012763)
-- Sergio Durigan Junior <email address hidden> Mon, 25 Mar 2024 14:58:39 -0400
------- Comment From <email address hidden> 2024-04-18 11:45 EDT-------
I have verified this bug on latest Ubuntu24.04 Host and the issue is not getting reproduced anymore!
root@ubuntu2404lp2:~# qemu-system-ppc64 -accel tcg -smp 10,maxcpus=9000
qemu-system-ppc64: Invalid SMP CPUs 9000. The max CPUs supported by machine 'pseries-noble' is 4096
root@ubuntu2404lp2:~# qemu-system-ppc64 -accel tcg -smp 10,maxcpus=123456789
qemu-system-ppc64: Invalid SMP CPUs 123456789. The max CPUs supported by machine 'pseries-noble' is 4096
kernel: 6.8.0-22-generic ppc64le ppc64le GNU/Linux
qemu: QEMU emulator version 8.2.2 (Debian 1:8.2.2+ds-0ubuntu1)
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