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Bug 1687596 - [Intel 8.1 BUG][KVM][Crystal Ridge]object_get_canonical_path_component: assertion failed: (obj->parent != NULL)
Summary: [Intel 8.1 BUG][KVM][Crystal Ridge]object_get_canonical_path_component: asser...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: qemu-kvm
Version: 8.1
Hardware: x86_64
OS: Linux
unspecified
high
Target Milestone: rc
: 8.1
Assignee: Paul Lai (Intel)
QA Contact: Yumei Huang
URL:
Whiteboard:
Depends On:
Blocks: 1654309 1699072 1710589
TreeView+ depends on / blocked
 
Reported: 2019-03-11 20:27 UTC by Paul Lai (Intel)
Modified: 2019-11-05 20:48 UTC (History)
9 users (show)

Fixed In Version: qemu-kvm-2.12.0-66.module+el8.1.0+3038+1e4b50a7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1699072 (view as bug list)
Environment:
Last Closed: 2019-11-05 20:48:05 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:3345 0 None None None 2019-11-05 20:48:35 UTC

Description Paul Lai (Intel) 2019-03-11 20:27:10 UTC 
Copied from BZ 1628098

Description of problem:
Boot guest with nvdimm device backed by a regular file on host, set pmem=on, qemu core dumped.

Looks like the fix didn't make it into v3.1.0

commit 87dc3ce60a8a16b47aeb6c5f4dbc14ee975563df
Author: Zhang Yi <yi.z.zhang.com>
Date:   Wed Oct 24 22:14:56 2018 +0800

    hostmem-file: remove object id from pmem error message



Version-Release number of selected component (if applicable):
qemu-kvm-rhev-2.12.0-14.el7

How reproducible:
always

Steps to Reproduce:
1. Boot qemu with pmem=on for memory backend backed by a regular file on host

# /usr/libexec/qemu-kvm  -object memory-backend-file,id=mem0,mem-path=/tmp/nv0,size=1G,share,pmem=on


Actual results:
ERROR:qom/object.c:1650:object_get_canonical_path_component: assertion failed: (obj->parent != NULL)
Aborted (core dumped)


Expected results:
No core dump.

Additional info:
Comment 1 Yumei Huang 2019-03-12 02:01:55 UTC 
Well, seems qemu3.1 don't have the core dump issue.

Tested with qemu-kvm-3.1.0-18.module+el8+2834+fa8bb6e2,

# /usr/libexec/qemu-kvm  -object memory-backend-file,id=mem0,mem-path=/tmp/nv0,size=1G,share,pmem=on
qemu-kvm: -object memory-backend-file,id=mem0,mem-path=/tmp/nv0,size=1G,share,pmem=on: Lack of libpmem support while setting the 'pmem=on' of memory-backend-file '(null)'. We can't ensure data persistence.
Comment 2 Paul Lai (Intel) 2019-04-11 17:05:45 UTC 
Copied from BZ 1628098

commit 111769e4a152fdb52f2b10fb957cdfec2fe7d4d2
Author: plai <plai>
Date:   Tue Jan 8 21:33:09 2019 +0100

    hostmem-file: remove object id from pmem error message
Comment 4 Danilo de Paula 2019-04-11 18:57:01 UTC 
Hai, please confirm the ITR value for this bug.
Comment 6 Danilo de Paula 2019-04-15 21:53:59 UTC 
Fix included in qemu-kvm-2.12.0-66.module+el8.1.0+3038+1e4b50a7
Comment 7 Danilo de Paula 2019-04-16 13:14:39 UTC 
qa_ack+ it please.
Comment 9 Yumei Huang 2019-06-24 11:25:19 UTC 
Verify:
qemu-kvm-2.12.0-78.module+el8.1.0+3434+46ed87c2
kernel-4.18.0-107.el8.x86_64

Tested following two scenarios, guest boot up well, no error in dmesg, and /dev/pmem0 is present in guest.

Guest dmesg:
[    2.400945] pmem0: detected capacity change from 0 to 2147483648


1) Using a regular file on host as nvdimm backend

# /usr/libexec/qemu-kvm -m 4G,maxmem=40G,slots= 8 -M pc,nvdimm /home/kvm_autotest_root/images/rhel810-64-virtio-scsi.qcow2  -object memory-backend-file,id=mem0,mem-path=/tmp/nv1test,size=2G,share,pmem=on -device nvdimm,id=dimm0,memdev=mem0 -monitor stdio -vnc :0 -serial tcp:0:1234,server,nowait


2) Using /dev/pmem emulated by adding memmap=4G!2G to kernel line
# /usr/libexec/qemu-kvm -m 4G,maxmem=40G,slots= 8 -M pc,nvdimm /home/kvm_autotest_root/images/rhel810-64-virtio-scsi.qcow2  -object memory-backend-file,id=mem0,mem-path=/tmp/nv1test,size=2G,share,pmem=on -device nvdimm,id=dimm0,memdev=mem0 -monitor stdio -vnc :0 -serial tcp:0:1234,server,nowait
Comment 11 errata-xmlrpc 2019-11-05 20:48:05 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://access.redhat.com/errata/RHSA-2019:3345
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