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Bug 1357346

Summary:	libvirtd memory leak when guest has hostdev element
Product:	Red Hat Enterprise Linux 7	Reporter:	Han Han <hhan>
Component:	libvirt	Assignee:	Michal Privoznik <mprivozn>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.3	CC:	dyuan, fjin, jferlan, rbalakri, xuzhang, yafu, yanyang, yisun
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	libvirt-2.0.0-4.el7	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-03 18:49:05 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 Han Han 2016-07-18 03:39:08 UTC

Description of problem:
As subject

Version-Release number of selected component (if applicable):
libvirt-2.0.0-2.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
Prepare a guest with hostdev in xml:
# virsh dumpxml 18564
...
    <hostdev mode='subsystem' type='scsi' managed='no' rawio='yes'>
      <source>
        <adapter name='scsi_host8'/>
        <address bus='0' target='0' unit='1'/>
      </source>
      <address type='drive' controller='0' bus='0' target='4' unit='8'/>
    </hostdev>
...

Stop libvirtd and start it with valgrind. Interrupt libvirtd (Ctrl+c) after it starts.
# systemctl stop libvirtd
# /usr/bin/valgrind --leak-check=full libvirtd
==9740== Memcheck, a memory error detector
==9740== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==9740== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==9740== Command: libvirtd
==9740==
--9740-- WARNING: unhandled amd64-linux syscall: 324
--9740-- You may be able to write your own handler.
--9740-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--9740-- Nevertheless we consider this a bug.  Please report
--9740-- it at http://valgrind.org/support/bug_reports.html.
^C==9740==
==9740== HEAP SUMMARY:
==9740==     in use at exit: 880,967 bytes in 11,309 blocks
==9740==   total heap usage: 631,482 allocs, 620,173 frees, 1,097,143,847 bytes allocated
==9740==
==9740== 168 bytes in 7 blocks are definitely lost in loss record 500 of 633
==9740==    at 0x4C29975: calloc (vg_replace_malloc.c:711)
==9740==    by 0x54B0A54: virAllocVar (viralloc.c:560)
==9740==    by 0x54FF695: virObjectNew (virobject.c:193)
==9740==    by 0x553B447: virDomainHostdevDefAlloc (domain_conf.c:2151)
==9740==    by 0x553EB84: virDomainHostdevDefParseXML (domain_conf.c:12714)
==9740==    by 0x55611E7: virDomainDefParseXML (domain_conf.c:17000)
==9740==    by 0x5561F9F: virDomainDefParseNode (domain_conf.c:17475)
==9740==    by 0x55620B7: virDomainDefParse (domain_conf.c:17422)
==9740==    by 0x556B4C2: virDomainObjListLoadConfig (virdomainobjlist.c:465)
==9740==    by 0x556B4C2: virDomainObjListLoadAllConfigs (virdomainobjlist.c:596)
==9740==    by 0x31260303: qemuStateInitialize (qemu_driver.c:907)
==9740==    by 0x55AB28E: virStateInitialize (libvirt.c:770)
==9740==    by 0x12254A: daemonRunStateInit (libvirtd.c:959)
==9740==
==9740== LEAK SUMMARY:
==9740==    definitely lost: 168 bytes in 7 blocks
==9740==    indirectly lost: 0 bytes in 0 blocks
==9740==      possibly lost: 0 bytes in 0 blocks
==9740==    still reachable: 880,799 bytes in 11,302 blocks
==9740==         suppressed: 0 bytes in 0 blocks
==9740== Reachable blocks (those to which a pointer was found) are not shown.
==9740== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==9740==
==9740== For counts of detected and suppressed errors, rerun with: -v
==9740== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)

Expected results:
No memory leak

Comment 4 yisun 2016-08-05 06:37:36 UTC

Verified on libvirt-2.0.0-4.el7.x86_64

Terminal one:
[root@bootp-73-75-161 ~]# valgrind --leak-check=full --trace-children=no --child-silent-after-fork=yes libvirtd
==16561== Memcheck, a memory error detector
==16561== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==16561== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==16561== Command: libvirtd
==16561== 



Terminal two:
# virsh start vm1
Domain vm1 started


# virsh dumpxml vm1 | grep hostdev -A10
    <hostdev mode='subsystem' type='scsi' managed='no' rawio='yes'>
      <source>
        <adapter name='scsi_host8'/>
        <address bus='0' target='0' unit='1'/>
      </source>
      <alias name='hostdev0'/>
      <address type='drive' controller='0' bus='0' target='4' unit='8'/>
    </hostdev>

Terminal one:
==16561== Warning: noted but unhandled ioctl 0x89a2 with no size/direction hints.
==16561==    This could cause spurious value errors to appear.
==16561==    See README_MISSING_SYSCALL_OR_IOCTL for guidance on writing a proper wrapper.
2016-08-05 06:31:19.925+0000: 16566: info : libvirt version: 2.0.0, package: 4.el7 (Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>, 2016-08-02-09:15:12, x86-034.build.eng.bos.redhat.com)
2016-08-05 06:31:19.925+0000: 16566: info : hostname: bootp-73-75-161.lab.eng.pek2.redhat.com
2016-08-05 06:31:19.925+0000: 16566: warning : qemuDomainObjTaint:3300 : Domain id=1 name='vm1' uuid=c4210bf2-a997-4f65-8c99-3d2e9ae2b833 is tainted: high-privileges
^C==16561== Conditional jump or move depends on uninitialised value(s)
==16561==    at 0x7A538C6: ??? (in /usr/lib64/libselinux.so.1)
==16561==    by 0x7A4FECB: selabel_close (in /usr/lib64/libselinux.so.1)
==16561==    by 0x56A4B4B: ??? (in /usr/lib64/libvirt.so.0.2000.0)
==16561==    by 0x56A0F92: ??? (in /usr/lib64/libvirt.so.0.2000.0)
==16561==    by 0x550059A: virObjectUnref (in /usr/lib64/libvirt.so.0.2000.0)
==16561==    by 0x569E9FE: ??? (in /usr/lib64/libvirt.so.0.2000.0)
==16561==    by 0x56A0F92: ??? (in /usr/lib64/libvirt.so.0.2000.0)
==16561==    by 0x550059A: virObjectUnref (in /usr/lib64/libvirt.so.0.2000.0)
==16561==    by 0x1E690F3F: ??? (in /usr/lib64/libvirt/connection-driver/libvirt_driver_qemu.so)
==16561==    by 0x55AF14A: virStateCleanup (in /usr/lib64/libvirt.so.0.2000.0)
==16561==    by 0x1206F7: ??? (in /usr/sbin/libvirtd)
==16561==    by 0x82AEB34: (below main) (libc-start.c:274)
==16561== 
==16561== 
==16561== HEAP SUMMARY:
==16561==     in use at exit: 805,603 bytes in 9,777 blocks
==16561==   total heap usage: 151,765 allocs, 141,988 frees, 816,331,198 bytes allocated
==16561== 
==16561== 62 bytes in 10 blocks are definitely lost in loss record 591 of 860
==16561==    at 0x4C27BFD: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==16561==    by 0x8313889: strndup (strndup.c:45)
==16561==    by 0x7A54752: ??? (in /usr/lib64/libselinux.so.1)
==16561==    by 0x7A54B4C: ??? (in /usr/lib64/libselinux.so.1)
==16561==    by 0x7A4FDE0: selabel_open (in /usr/lib64/libselinux.so.1)
==16561==    by 0x56A4BFD: ??? (in /usr/lib64/libvirt.so.0.2000.0)
==16561==    by 0x56A10BA: ??? (in /usr/lib64/libvirt.so.0.2000.0)
==16561==    by 0x1E692868: ??? (in /usr/lib64/libvirt/connection-driver/libvirt_driver_qemu.so)
==16561==    by 0x55AEFEE: virStateInitialize (in /usr/lib64/libvirt.so.0.2000.0)
==16561==    by 0x12254A: ??? (in /usr/sbin/libvirtd)
==16561==    by 0x551CD31: ??? (in /usr/lib64/libvirt.so.0.2000.0)
==16561==    by 0x8078DC4: start_thread (pthread_create.c:308)
==16561== 
==16561== LEAK SUMMARY:
==16561==    definitely lost: 62 bytes in 10 blocks
==16561==    indirectly lost: 0 bytes in 0 blocks
==16561==      possibly lost: 0 bytes in 0 blocks
==16561==    still reachable: 805,541 bytes in 9,767 blocks
==16561==         suppressed: 0 bytes in 0 blocks
==16561== Reachable blocks (those to which a pointer was found) are not shown.
==16561== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==16561== 
==16561== For counts of detected and suppressed errors, rerun with: -v
==16561== Use --track-origins=yes to see where uninitialised values come from
==16561== ERROR SUMMARY: 26 errors from 2 contexts (suppressed: 0 from 0)


=====
Although there is still mem leak, but not related to hostdev. And when start a vm without hostdev, seem errors reported. So close this bug as verified. And will open a new mem leak bug after confirmed.

Comment 6 errata-xmlrpc 2016-11-03 18:49:05 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://rhn.redhat.com/errata/RHSA-2016-2577.html