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Bug 1360225

Summary:	Can't extract guest memory dump from qemu core
Product:	Red Hat Enterprise Linux 7	Reporter:	Xujun Ma <xuma>
Component:	qemu-kvm-rhev	Assignee:	Miroslav Rezanina <mrezanin>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.3	CC:	drjones, lersek, michen, mrezanin, qzhang, thuth, virt-maint
Target Milestone:	rc
Target Release:	---
Hardware:	ppc64le
OS:	Unspecified
Whiteboard:
Fixed In Version:	qemu-kvm-rhev-2.6.0-17.el7	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-07 21:26:34 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Xujun Ma 2016-07-26 09:34:13 UTC

Description of problem:
Can't extract guest memory dump from qemu core

Version-Release number of selected component (if applicable):
hostkernel:3.10.0-470.el7.ppc64le
guestkernel:3.10.0-470.el7.ppc64le
qemu:qemu-kvm-rhev-2.6.0-13.el7.ppc64le

How reproducible:
100%

Steps to Reproduce:
1.Setup as below in the terminal which run the qemu-kvm proceed
ulimit -c unlimited 
echo "/var/core.%p-%u-%g-%s-%t-%h-%e" >
/proc/sys/kernel/core_pattern
2.Boot up guest with dump-guest-core=on
/usr/libexec/qemu-kvm \
 -name test \
 -machine type=pseries,dump-guest-core=on \
 -smp 4 \
 -m 4096 \
 -monitor stdio \
 -rtc base=utc,clock=vm \
 -vnc :20 \
 -qmp tcp:0:4444,server,nowait \
 -device virtio-scsi-pci,bus=pci.0 \
 -device spapr-pci-host-bridge,id=vfiohost,index=0x1 \
 -device virtio-net-pci,netdev=net0,id=nic0,mac=52:54:00:c4:e7:84 \
 -netdev tap,id=net0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,vhost=on 
 -device scsi-hd,id=scsi-hd0,drive=scsi-hd0-dr0,bootindex=0 \
 -drive file=/root/RHEL-7.2.qcow2,if=none,id=scsi-hd0-dr0,format=qcow2,cache=none \
3.Kill the qemu-kvm process with SIGSEGV
pkill -SEGV -x qemu-kvm
4.Open the "coredump" file with gdb, and load the extension.
gdb /var/core.28761-0-0-11-1401176809-hp-dl385g7-05.qe.lab.eng.nay.redhat
.com-qemu-kvm
(gdb) source /usr/share/qemu-kvm/dump-guest-memory.py

Actual results:
 /usr/share/qemu-kvm/dump-guest-memory.py:No such file or directory


Expected results:
/usr/share/qemu-kvm/dump-guest-memory.py exist and can load the extension.

Additional info:
x86 qemu have this file.

Comment 1 Thomas Huth 2016-07-26 09:52:50 UTC

Looks like dump-guest-memory.py was written for x86 only initially, but support for ppc64 has been added since QEMU 2.6.0:

 http://git.qemu.org/?p=qemu.git;a=commitdiff;h=368e3adc8928b278693

Mirek, do you think it would be OK to package this file into the qemu-kvm-rhev RPM for ppc64le, too, nowadays?

Comment 2 Laszlo Ersek 2016-07-26 10:21:42 UTC

Sounds reasonable to me.

Comment 4 Andrew Jones 2016-07-26 12:03:33 UTC

(In reply to Thomas Huth from comment #1)
> Mirek, do you think it would be OK to package this file into the
> qemu-kvm-rhev RPM for ppc64le, too, nowadays?

And for AArch64.

Thanks,
drew

Comment 5 Andrew Jones 2016-07-26 12:04:25 UTC

(In reply to Andrew Jones from comment #4)
> (In reply to Thomas Huth from comment #1)
> > Mirek, do you think it would be OK to package this file into the
> > qemu-kvm-rhev RPM for ppc64le, too, nowadays?
> 
> And for AArch64.
> 
> Thanks,
> drew

Should I clone this BZ? Or can we flip flags on this one to make it multi-arch?

Comment 6 Laszlo Ersek 2016-07-26 12:27:01 UTC

I think doing it for all supported arches at once would be simplest.

Comment 7 Miroslav Rezanina 2016-07-26 12:34:09 UTC

Yes, we can get this file into qemu-kvm-rhev as this is bringing ppc64/aarch64 closer to our x86_64 behavior.

Comment 8 Miroslav Rezanina 2016-07-29 09:12:40 UTC

Fix included in qemu-kvm-rhev-2.6.0-17.el7

Comment 10 mazhang 2016-08-05 02:58:29 UTC

Reproduce this bug on qemu-kvm-rhev-2.6.0-11.el7.

Host:
qemu-kvm-rhev-2.6.0-11.el7
3.10.0-481.el7.ppc64le

Steps:
Same as comment#0.

Result:

Program terminated with signal 11, Segmentation fault.
#0  0x00003fff82e2d694 in ppoll () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install alsa-lib-1.1.1-1.el7.ppc64le bzip2-libs-1.0.6-13.el7.ppc64le cyrus-sasl-lib-2.1.26-20.el7_2.ppc64le cyrus-sasl-md5-2.1.26-20.el7_2.ppc64le cyrus-sasl-plain-2.1.26-20.el7_2.ppc64le dbus-libs-1.6.12-14.el7.ppc64le elfutils-libelf-0.166-2.el7.ppc64le elfutils-libs-0.166-2.el7.ppc64le flac-libs-1.3.0-5.el7_1.ppc64le glib2-2.46.2-3.el7.ppc64le glibc-2.17-155.el7.ppc64le gmp-6.0.0-12.el7_1.ppc64le gnutls-3.3.24-1.el7.ppc64le gperftools-libs-2.4-8.el7.ppc64le gsm-1.0.13-11.el7.ppc64le json-c-0.11-4.el7_0.ppc64le keyutils-libs-1.5.8-3.el7.ppc64le krb5-libs-1.14.1-18.el7.ppc64le libICE-1.0.9-2.el7.ppc64le libSM-1.2.2-2.el7.ppc64le libX11-1.6.3-3.el7.ppc64le libXau-1.0.8-2.1.el7.ppc64le libXext-1.3.3-3.el7.ppc64le libXi-1.7.4-2.el7.ppc64le libXtst-1.2.2-2.1.el7.ppc64le libaio-0.3.109-13.el7.ppc64le libasyncns-0.8-7.el7.ppc64le libattr-2.4.46-12.el7.ppc64le libcacard-2.5.2-2.el7.ppc64le libcap-2.22-8.el7.ppc64le libcom_err-1.42.9-9.el7.ppc64le libcurl-7.29.0-32.el7.ppc64le libdb-5.3.21-19.el7.ppc64le libfdt-1.4.0-2.el7.ppc64le libffi-3.0.13-18.el7.ppc64le libgcc-4.8.5-9.el7.ppc64le libgcrypt-1.5.3-12.el7_1.1.ppc64le libgpg-error-1.12-3.el7.ppc64le libibverbs-1.2.0-2.el7.ppc64le libidn-1.28-4.el7.ppc64le libiscsi-1.9.0-7.el7.ppc64le libnl3-3.2.28-1.el7.ppc64le libogg-1.3.0-7.el7.ppc64le libpng-1.5.13-7.el7_2.ppc64le librdmacm-1.1.0-2.el7.ppc64le libselinux-2.5-4.el7.ppc64le libsndfile-1.0.25-10.el7.ppc64le libssh2-1.4.3-10.el7_2.1.ppc64le libstdc++-4.8.5-9.el7.ppc64le libtasn1-3.8-3.el7.ppc64le libusbx-1.0.20-1.el7.ppc64le libuuid-2.23.2-33.el7.ppc64le libvorbis-1.3.3-8.el7.ppc64le libxcb-1.11-4.el7.ppc64le lzo-2.06-8.el7.ppc64le nettle-2.7.1-5.el7.ppc64le nspr-4.11.0-1.el7_2.ppc64le nss-3.21.0-17.el7.ppc64le nss-softokn-freebl-3.16.2.3-14.4.el7.ppc64le nss-util-3.21.0-2.2.el7_2.ppc64le numactl-libs-2.0.9-6.el7_2.ppc64le openldap-2.4.40-12.el7.ppc64le openssl-libs-1.0.1e-58.el7.ppc64le p11-kit-0.20.7-3.el7.ppc64le pcre-8.32-15.el7_2.1.ppc64le pixman-0.34.0-1.el7.ppc64le pulseaudio-libs-6.0-8.el7.ppc64le snappy-1.1.0-3.el7.ppc64le systemd-libs-219-24.el7.ppc64le tcp_wrappers-libs-7.6-77.el7.ppc64le trousers-0.3.13-1.el7.ppc64le xz-libs-5.2.2-1.el7.ppc64le zlib-1.2.7-17.el7.ppc64le
(gdb) source /usr/share/qemu-kvm/dump-guest-memory.py
/usr/share/qemu-kvm/dump-guest-memory.py: No such file or directory.


Test this bug on qemu-kvm-rhev-2.6.0-17.el7.ppc64le

Result:

(gdb) source /usr/share/qemu-kvm/dump-guest-memory.py
(gdb) bt
#0  0x00003fff781bd694 in ppoll () from /lib64/libc.so.6
#1  0x0000000049280b00 in ppoll (__ss=0x0, __timeout=<optimized out>, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/bits/poll2.h:77
#2  qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at qemu-timer.c:325
#3  0x000000004927fec0 in os_host_main_loop_wait (timeout=2999873939) at main-loop.c:252
#4  main_loop_wait (nonblocking=<optimized out>) at main-loop.c:506
#5  0x0000000048fa62e0 in main_loop () at vl.c:1939
#6  main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4669

So this bug has been fixed on ppc64le.

Comment 12 errata-xmlrpc 2016-11-07 21:26:34 UTC

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.

https://rhn.redhat.com/errata/RHBA-2016-2673.html