Bugzilla will be upgraded to version 5.0. The upgrade date is tentatively scheduled for 2 December 2018, pending final testing and feedback.
First Last Prev Next    This bug is not in your last search results.
Bug 990237 - qemu-kvm exits when hotplugging a cpu with --no-acpi
qemu-kvm exits when hotplugging a cpu with --no-acpi
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: qemu-kvm (Show other bugs)
6.5
x86_64 Linux
unspecified Severity low
: rc
: ---
Assigned To: Igor Mammedov
Virtualization Bugs
:
Depends On:
Blocks:
  Show dependency tree / graph
 
Reported: 2013-07-30 11:53 EDT by Peter Krempa
Modified: 2013-12-05 05:10 EST (History)
11 users (show)

See Also:
Fixed In Version: qemu-kvm-0.12.1.2-2.390.el6
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Environment:
Last Closed: 2013-11-21 02:05:49 EST
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
[RHEL-6.5 qemu-kvm PATCH] Do not quit QEMU if cpu-set is called in non ACPI mode (1020 bytes, patch)
2013-07-31 03:57 EDT, Igor Mammedov 		no flags Details | Diff
Add an attachment (proposed patch, testcase, etc.)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2013:1553 normal SHIPPED_LIVE Important: qemu-kvm security, bug fix, and enhancement update 2013-11-20 16:40:29 EST

  None (edit)
Description Peter Krempa 2013-07-30 11:53:04 EDT 
Description of problem:
When attempting to start a new cpu on a machine without ACPI qemu-kvm exits instead of reporting an error to the monitor and forbidding the hotplug that is not possible without ACPI.

Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.382.el6.x86_64

How reproducible:
Always.

Steps to Reproduce:
1. Start qemu-kvm with free cpu sockets and -no-acpi
2. try to hotplug a cpu
3. qemu exits

Actual results:
qemu-kvm exits with:

Unknown cpu model: <84><8B>^?
Unable to support requested x86 CPU definition

(note the binary characters, probably another issue)

Expected results:
qemu-kvm forbids hotplug of the cpus via a monitor message

Additional info:
Comment 2 Igor Mammedov 2013-07-31 03:57:11 EDT 
Created attachment 780984 [details]
[RHEL-6.5 qemu-kvm PATCH] Do not quit QEMU if cpu-set is called in non ACPI mode
Comment 6 Markus Armbruster 2013-08-14 07:08:19 EDT 
Alternate reproducer that crashes rather than terminates QEMU:

$ qemu-kvm -nodefaults -vnc :0 -monitor stdio -S -smp 2 -no-acpi
QEMU 0.12.1 monitor - type 'help' for more information
(qemu) cpu_set 1 offline
Segmentation fault (core dumped)
Comment 10 zhonglinzhang 2013-09-09 04:41:04 EDT 
Reproduce with qemu-kvm-0.12.1.2-2.356.el6.x86_64

Steps to Reproduce:
1. Boot a guest with following command line:
/usr/libexec/qemu-kvm -M pc -nodefaults  -cpu SandyBridge -enable-kvm -m 4G -smp 4,sockets=1,cores=4,threads=1 -no-acpi  .........................

2. Check cpu in qemu monitor:
(qemu) info cpus
* CPU #0: pc=0xffffffff8103eccb (halted) thread_id=15109 
  CPU #1: pc=0x00000000000f58a7 (halted) thread_id=15110 
  CPU #2: pc=0x00000000000f58a7 (halted) thread_id=15111 
  CPU #3: pc=0x00000000000f58a7 (halted) thread_id=15112

3. (qemu) cpu_set 1 offline

Actual Results:
qemu-kvm core dump
(gdb) bt
#0  disable_processor (cpu=<value optimized out>, state=<value optimized out>, mon=0x7ffff88d8820)
    at /usr/src/debug/qemu-kvm-0.12.1.2/hw/acpi.c:974
#1  qemu_system_cpu_hot_add (cpu=<value optimized out>, state=<value optimized out>, mon=0x7ffff88d8820)
    at /usr/src/debug/qemu-kvm-0.12.1.2/hw/acpi.c:1002
#2  0x00007ffff7dec189 in handle_user_command (mon=0x7ffff88d8820, cmdline=<value optimized out>)
    at /usr/src/debug/qemu-kvm-0.12.1.2/monitor.c:4368
#3  0x00007ffff7dec1ea in monitor_command_cb (mon=0x7ffff88d8820, cmdline=<value optimized out>, 
    opaque=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/monitor.c:5001
#4  0x00007ffff7e49fbd in readline_handle_byte (rs=0x7ffff9cdfd80, ch=<value optimized out>)
    at /usr/src/debug/qemu-kvm-0.12.1.2/readline.c:369
#5  0x00007ffff7dec410 in monitor_read (opaque=<value optimized out>, buf=0x7fffffffba90 "\r", size=1)
    at /usr/src/debug/qemu-kvm-0.12.1.2/monitor.c:4987
#6  0x00007ffff7e600cb in qemu_chr_read (opaque=0x7ffff86db700)
    at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:180
#7  fd_chr_read (opaque=0x7ffff86db700) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:688
#8  0x00007ffff7ddf29f in main_loop_wait (timeout=1000) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:3975
#9  0x00007ffff7e0197a in kvm_main_loop () at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:2244
#10 0x00007ffff7de2008 in main_loop (argc=37, argv=<value optimized out>, envp=<value optimized out>)
    at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4187
#11 main (argc=37, argv=<value optimized out>, envp=<value optimized out>)
    at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6525



Verify with qemu-kvm-0.12.1.2-2.400.el6.x86_64
steps as above
Actual Results: 
qemu-kvm no core dump
(qemu) cpu_set 1 offline
CPU hot add is disabled by -no-acpi option


Based on above information, so this issue has been fixed.
Comment 11 zhonglinzhang 2013-09-13 03:56:31 EDT 
(In reply to zhonglinzhang from comment #10)
> Reproduce with qemu-kvm-0.12.1.2-2.356.el6.x86_64
> 
> Steps to Reproduce:
> 1. Boot a guest with following command line:
> /usr/libexec/qemu-kvm -M pc -nodefaults  -cpu SandyBridge -enable-kvm -m 4G
> -smp 4,sockets=1,cores=4,threads=1 -no-acpi  .........................
> 
> 2. Check cpu in qemu monitor:
> (qemu) info cpus
> * CPU #0: pc=0xffffffff8103eccb (halted) thread_id=15109 
>   CPU #1: pc=0x00000000000f58a7 (halted) thread_id=15110 
>   CPU #2: pc=0x00000000000f58a7 (halted) thread_id=15111 
>   CPU #3: pc=0x00000000000f58a7 (halted) thread_id=15112
> 
> 3. (qemu) cpu_set 1 offline
> 
> Actual Results:
> qemu-kvm core dump
> (gdb) bt
> #0  disable_processor (cpu=<value optimized out>, state=<value optimized
> out>, mon=0x7ffff88d8820)
>     at /usr/src/debug/qemu-kvm-0.12.1.2/hw/acpi.c:974
> #1  qemu_system_cpu_hot_add (cpu=<value optimized out>, state=<value
> optimized out>, mon=0x7ffff88d8820)
>     at /usr/src/debug/qemu-kvm-0.12.1.2/hw/acpi.c:1002
> #2  0x00007ffff7dec189 in handle_user_command (mon=0x7ffff88d8820,
> cmdline=<value optimized out>)
>     at /usr/src/debug/qemu-kvm-0.12.1.2/monitor.c:4368
> #3  0x00007ffff7dec1ea in monitor_command_cb (mon=0x7ffff88d8820,
> cmdline=<value optimized out>, 
>     opaque=<value optimized out>) at
> /usr/src/debug/qemu-kvm-0.12.1.2/monitor.c:5001
> #4  0x00007ffff7e49fbd in readline_handle_byte (rs=0x7ffff9cdfd80, ch=<value
> optimized out>)
>     at /usr/src/debug/qemu-kvm-0.12.1.2/readline.c:369
> #5  0x00007ffff7dec410 in monitor_read (opaque=<value optimized out>,
> buf=0x7fffffffba90 "\r", size=1)
>     at /usr/src/debug/qemu-kvm-0.12.1.2/monitor.c:4987
> #6  0x00007ffff7e600cb in qemu_chr_read (opaque=0x7ffff86db700)
>     at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:180
> #7  fd_chr_read (opaque=0x7ffff86db700) at
> /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:688
> #8  0x00007ffff7ddf29f in main_loop_wait (timeout=1000) at
> /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:3975
> #9  0x00007ffff7e0197a in kvm_main_loop () at
> /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:2244
> #10 0x00007ffff7de2008 in main_loop (argc=37, argv=<value optimized out>,
> envp=<value optimized out>)
>     at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4187
> #11 main (argc=37, argv=<value optimized out>, envp=<value optimized out>)
>     at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6525
> 
> 
> 
> Verify with qemu-kvm-0.12.1.2-2.400.el6.x86_64
> steps as above
> Actual Results: 
> qemu-kvm no core dump
> (qemu) cpu_set 1 offline
> CPU hot add is disabled by -no-acpi option
> 
> 
> Based on above information, so this issue has been fixed.




In "Steps to Reproduce" step 3
(qemu) cpu_set 1 online
core dump
(gdb) bt
#0  enable_processor (cpu=<value optimized out>, state=<value optimized out>, mon=0x7ffff9ce32d0)
    at /usr/src/debug/qemu-kvm-0.12.1.2/hw/acpi.c:968
#1  qemu_system_cpu_hot_add (cpu=<value optimized out>, state=<value optimized out>, mon=0x7ffff9ce32d0)
    at /usr/src/debug/qemu-kvm-0.12.1.2/hw/acpi.c:1000
#2  0x00007ffff7dec189 in handle_user_command (mon=0x7ffff9ce32d0, cmdline=<value optimized out>)
    at /usr/src/debug/qemu-kvm-0.12.1.2/monitor.c:4368
#3  0x00007ffff7dec1ea in monitor_command_cb (mon=0x7ffff9ce32d0, cmdline=<value optimized out>, 
    opaque=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/monitor.c:5001
#4  0x00007ffff7e49fbd in readline_handle_byte (rs=0x7ffff9cf4010, ch=<value optimized out>)
    at /usr/src/debug/qemu-kvm-0.12.1.2/readline.c:369
#5  0x00007ffff7dec410 in monitor_read (opaque=<value optimized out>, buf=0x7fffffffb9e0 "\r", size=1)
    at /usr/src/debug/qemu-kvm-0.12.1.2/monitor.c:4987
#6  0x00007ffff7e600cb in qemu_chr_read (opaque=0x7ffff86dbc60)
    at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:180
#7  fd_chr_read (opaque=0x7ffff86dbc60) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:688
#8  0x00007ffff7ddf29f in main_loop_wait (timeout=1000) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:3975
#9  0x00007ffff7e0197a in kvm_main_loop () at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:2244
#10 0x00007ffff7de2008 in main_loop (argc=41, argv=<value optimized out>, envp=<value optimized out>)
    at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4187
#11 main (argc=41, argv=<value optimized out>, envp=<value optimized out>)
    at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6525




Verify step 3 
(qemu) cpu_set 1 online
CPU hot add is disabled by -no-acpi option
no core dump





Based on above information, so this issue has been fixed.
Comment 13 errata-xmlrpc 2013-11-21 02:05:49 EST 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-1553.html
Note You need to log in before you can comment on or make changes to this bug.
First Last Prev Next    This bug is not in your last search results.