November 2013 - Devel - libvirt List Archives

[libvirt] [PATCH] Link libvirt-sandbox from apps page
by Daniel P. Berrange 02 Dec '13

02 Dec '13

From: "Daniel P. Berrange" <berrange(a)redhat.com> Add a link to the http://sandbox.libvirt.org sub-site from the list of libraries related to libvirt. Also fix formatting for the ruby libvirt binding. Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com> --- docs/apps.html.in | 27 ++++++++++++++++----------- 1 file changed, 16 insertions(+), 11 deletions(-) diff --git a/docs/apps.html.in b/docs/apps.html.in index 3598062..79e46fd 100644 --- a/docs/apps.html.in +++ b/docs/apps.html.in @@ -277,19 +277,24 @@ host, and there is a subproject to allow merging changes into the Windows Registry in Windows guests. </dd> + + <dt><a href="http://sandbox.libvirt.org">libvirt-sandbox</a></dd> + <dd> + A library and command line tools for simplifying the creation of + application sandboxes using virtualization technology. It currently + supports either KVM, QEMU or LXC as backends. Integration with + systemd facilitates sandboxing of system services like apache. + </dd> + <dt><a href="https://github.com/ohadlevy/virt#readme">Ruby + Libvirt Object bindings</a></dt> + <dd> + Allows using simple ruby objects to manipulate + hypervisors, guests, storage, network etc. It is + based on top of + the <a href="http://libvirt.org/ruby">native ruby bindings</a>. + </dd> </dl> - <dl> - <dt><a href="https://github.com/ohadlevy/virt#readme">Ruby - Libvirt Object bindings</a></dt> - <dd> - Allows using simple ruby objects to manipulate - hypervisors, guests, storage, network etc. It is - based on top of - the <a href="http://libvirt.org/ruby">native ruby - bindings</a>. - </dd> - </dl> <h2><a name="livecd">LiveCD / Appliances</a></h2> <dl> -- 1.8.3.1

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[libvirt] [PATCH v2] Fix memory leak in virNWFilterDefParseXML()
by Nehal J Wani 02 Dec '13

02 Dec '13

While running nwfilterxml2xmltest, it was found that valgrind pointed out the following error... ==7466== 16 bytes in 1 blocks are definitely lost in loss record 26 of 90 ==7466== at 0x4A06B6F: calloc (vg_replace_malloc.c:593) ==7466== by 0x4C651AD: virAlloc (viralloc.c:142) ==7466== by 0x4D0450D: virNWFilterDefParseNode (nwfilter_conf.c:2575) ==7466== by 0x4D05D84: virNWFilterDefParse (nwfilter_conf.c:2647) ==7466== by 0x401FDE: testCompareXMLToXMLHelper (nwfilterxml2xmltest.c:39) ==7466== by 0x402DE1: virtTestRun (testutils.c:138) ==7466== by 0x4018E9: mymain (nwfilterxml2xmltest.c:111) ==7466== by 0x403482: virtTestMain (testutils.c:593) ==7466== by 0x341F421A04: (below main) (libc-start.c:225) ...21 times, which are related to 21 tests in nwfilterxml2xmltest.c which sent EXPECT_WARN = false. There were two scenarios in virNWFilterDefParseXML(), when the variable 'entry' was malloc'ed, but not freed. --- src/conf/nwfilter_conf.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/src/conf/nwfilter_conf.c b/src/conf/nwfilter_conf.c index 793cb0e..d280df5 100644 --- a/src/conf/nwfilter_conf.c +++ b/src/conf/nwfilter_conf.c @@ -2576,21 +2576,25 @@ virNWFilterDefParseXML(xmlXPathContextPtr ctxt) { goto cleanup; if (xmlStrEqual(curr->name, BAD_CAST "rule")) { - if (!(entry->rule = virNWFilterRuleParse(curr))) + if (!(entry->rule = virNWFilterRuleParse(curr))) { + virNWFilterEntryFree(entry); goto cleanup; + } } else if (xmlStrEqual(curr->name, BAD_CAST "filterref")) { - if (!(entry->include = virNWFilterIncludeParse(curr))) + if (!(entry->include = virNWFilterIncludeParse(curr))) { + virNWFilterEntryFree(entry); goto cleanup; + } } if (entry->rule || entry->include) { if (VIR_REALLOC_N(ret->filterEntries, ret->nentries+1) < 0) { - VIR_FREE(entry); + virNWFilterEntryFree(entry); goto cleanup; } ret->filterEntries[ret->nentries++] = entry; } else - VIR_FREE(entry); + virNWFilterEntryFree(entry); } curr = curr->next; } -- 1.8.1.4

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[libvirt] [PATCH] Fix memory leak in virDomainDefParseXML()
by Nehal J Wani 02 Dec '13

02 Dec '13

This patch fixes the memory leaks found while running qemuxml2argvtest ==8260== 3 bytes in 1 blocks are definitely lost in loss record 1 of 129 ==8260== at 0x4A0887C: malloc (vg_replace_malloc.c:270) ==8260== by 0x341F485E21: strdup (strdup.c:42) ==8260== by 0x4CADCFF: virStrdup (virstring.c:554) ==8260== by 0x4CBB839: virXPathString (virxml.c:90) ==8260== by 0x4CE753A: virDomainDefParseXML (domain_conf.c:11478) ==8260== by 0x4CEB4FE: virDomainDefParseNode (domain_conf.c:12742) ==8260== by 0x4CEB675: virDomainDefParse (domain_conf.c:12684) ==8260== by 0x425958: testCompareXMLToArgvHelper (qemuxml2argvtest.c:107) ==8260== by 0x427111: virtTestRun (testutils.c:138) ==8260== by 0x41D3FE: mymain (qemuxml2argvtest.c:452) ==8260== by 0x4277B2: virtTestMain (testutils.c:593) ==8260== by 0x341F421A04: (below main) (libc-start.c:225) ==8260== ==8260== 4 bytes in 1 blocks are definitely lost in loss record 5 of 129 ==8260== at 0x4A0887C: malloc (vg_replace_malloc.c:270) ==8260== by 0x341F485E21: strdup (strdup.c:42) ==8260== by 0x4CADCFF: virStrdup (virstring.c:554) ==8260== by 0x4CBB839: virXPathString (virxml.c:90) ==8260== by 0x4CE753A: virDomainDefParseXML (domain_conf.c:11478) ==8260== by 0x4CEB4FE: virDomainDefParseNode (domain_conf.c:12742) ==8260== by 0x4CEB675: virDomainDefParse (domain_conf.c:12684) ==8260== by 0x425958: testCompareXMLToArgvHelper (qemuxml2argvtest.c:107) ==8260== by 0x427111: virtTestRun (testutils.c:138) ==8260== by 0x41D39A: mymain (qemuxml2argvtest.c:451) ==8260== by 0x4277B2: virtTestMain (testutils.c:593) ==8260== by 0x341F421A04: (below main) (libc-start.c:225) ==8260== --- src/conf/domain_conf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 140eb80..5449bd7 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -11486,6 +11486,7 @@ virDomainDefParseXML(xmlDocPtr xml, def->features[val] = VIR_DOMAIN_FEATURE_STATE_ON; } ctxt->node = node; + VIR_FREE(tmp); break; case VIR_DOMAIN_FEATURE_LAST: -- 1.8.1.4

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[libvirt] [PATCH] virsh: fix doc typos
by Nehal J Wani 02 Dec '13

02 Dec '13

Fix 6 minor spelling errors in virsh doc --- tools/virsh.pod | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/tools/virsh.pod b/tools/virsh.pod index dac9a08..f51060f 100644 --- a/tools/virsh.pod +++ b/tools/virsh.pod @@ -560,7 +560,7 @@ exits. If I<--pass-fds> is specified, the argument is a comma separated list of open file descriptors which should be pass on into the guest. The -file descriptors will be re-numered in the guest, starting from 3. This +file descriptors will be re-numbered in the guest, starting from 3. This is only supported with container based virtualization. B<Example> @@ -889,7 +889,7 @@ also B<domblklist> for listing these names). If I<--abort> is specified, the active job on the specified disk will be aborted. If I<--async> is also specified, this command will return -immediately, rather than waiting for the cancelation to complete. If +immediately, rather than waiting for the cancellation to complete. If I<--pivot> is specified, this requests that an active copy job be pivoted over to the new copy. If I<--info> is specified, the active job information on the specified @@ -1158,7 +1158,7 @@ hostname which will not resolve to match one of its public IP addresses, then libvirt will generate an incorrect URI. In this case I<migrateuri> should be explicitly specified, using an IP address, or a correct hostname. -=item * The host has multiple network interaces. If a host has multiple network +=item * The host has multiple network interfaces. If a host has multiple network interfaces, it might be desirable for the migration data stream to be sent over a specific interface for either security or performance reasons. In this case I<migrateuri> should be explicitly specified, using an IP address associated @@ -1739,8 +1739,8 @@ hypervisor. Suspend a running domain into one of these states (possible I<target> values): - mem equivallent of S3 ACPI state - disk equivallent of S4 ACPI state + mem equivalent of S3 ACPI state + disk equivalent of S4 ACPI state hybrid RAM is saved to disk but not powered off The I<--duration> argument specifies number of seconds before the domain is @@ -2740,7 +2740,7 @@ B<Supported algorithms> sanitizing removable and non-removable hard disks: random x2, 0x00, verify. dod - 4-pass DoD 5220.22-M section 8-306 procedure for - sanitizing removeable and non-removeable rigid + sanitizing removable and non-removable rigid disks: random, 0x00, 0xff, verify. bsi - 9-pass method recommended by the German Center of Security in Information Technologies -- 1.8.1.4

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[libvirt] [PATCH] Fix typos in various docs
by Nehal J Wani 02 Dec '13

02 Dec '13

Fix 8 minor spelling errors in docs/*.html.in --- docs/api.html.in | 2 +- docs/bugs.html.in | 2 +- docs/drvlxc.html.in | 2 +- docs/firewall.html.in | 4 ++-- docs/internals/rpc.html.in | 2 +- docs/remote.html.in | 2 +- docs/storage.html.in | 2 +- 7 files changed, 8 insertions(+), 8 deletions(-) diff --git a/docs/api.html.in b/docs/api.html.in index f77e9db..eae7657 100644 --- a/docs/api.html.in +++ b/docs/api.html.in @@ -207,7 +207,7 @@ virtualization <a href="#Functions">functions</a>. Depending upon the driver being used, calls will be routed through the remote driver to the libvirtd daemon. The daemon will reference the connection specific - driver in order to retreive the requested information and then pass + driver in order to retrieve the requested information and then pass back status and/or data through the connection back to the application. The application can then decide what to do with that data, such as display, write log data, etc. <a href="migration.html">Migration</a> diff --git a/docs/bugs.html.in b/docs/bugs.html.in index 2295ae9..140d1b4 100644 --- a/docs/bugs.html.in +++ b/docs/bugs.html.in @@ -148,7 +148,7 @@ ... note the process id from the output # gdb /usr/sbin/libvirtd .... some information about gdb and loading debug data -(gdb) attach $the_damon_process_id +(gdb) attach $the_daemon_process_id .... (gdb) thread apply all bt .... information to attach to the bug diff --git a/docs/drvlxc.html.in b/docs/drvlxc.html.in index d5a4410..7494eb3 100644 --- a/docs/drvlxc.html.in +++ b/docs/drvlxc.html.in @@ -620,7 +620,7 @@ to PID 1 inside the container. <p> If the container does not respond to the graceful shutdown -request, it can be forceably stopped using the <code>virsh destroy</code> +request, it can be forcibly stopped using the <code>virsh destroy</code> </p> <pre> diff --git a/docs/firewall.html.in b/docs/firewall.html.in index 42642bc..5bb6dc1 100644 --- a/docs/firewall.html.in +++ b/docs/firewall.html.in @@ -142,7 +142,7 @@ MASQUERADE all -- * * 192.168.122.0/24 !192.168.122.0/24</pre> <p><a href="http://www.dmtf.org/standards/cim/cim_schema_v2230/CIM_Network.pdf">http://www.dmtf.org/standards/cim/cim_schema_v2230/CIM_Network.pdf</a></p> <p>The filters are managed in libvirt as a top level, standalone object. This allows the filters to then be referenced by any libvirt object - that requires their functionality, instead tieing them only to use + that requires their functionality, instead tying them only to use by guest NICs. In the current implementation, filters can be associated with individual guest NICs via the libvirt domain XML format. In the future we might allow filters to be associated with the virtual network @@ -272,7 +272,7 @@ f5c78134-9da4-0c60-a9f0-fb37bc21ac1f no-other-rarp-traffic to update them. This ensures the guests have their iptables/ebtables rules recreated. </p> - <p>To associate the clean-trafffic filter with a guest, edit the + <p>To associate the clean-traffic filter with a guest, edit the guest XML config and change the <code><interface></code> element to include a <code><filterref></code> and also specify the whitelisted <code><ip address/></code> the guest is allowed to diff --git a/docs/internals/rpc.html.in b/docs/internals/rpc.html.in index 40fb59d..627d7aa 100644 --- a/docs/internals/rpc.html.in +++ b/docs/internals/rpc.html.in @@ -743,7 +743,7 @@ <p> The main libvirt event loop thread is responsible for performing all - socket I/O. It will read incoming packets from clients and willl + socket I/O. It will read incoming packets from clients and will transmit outgoing packets to clients. It will handle the I/O to/from streams associated with client API calls. When doing client I/O it will also pass the data through any applicable encryption layer diff --git a/docs/remote.html.in b/docs/remote.html.in index 25ae30e..dc9b354 100644 --- a/docs/remote.html.in +++ b/docs/remote.html.in @@ -376,7 +376,7 @@ Note that parameter values must be <td> libssh2 </td> <td> A comma separated list of authentication methods to use. Default (is - "agent,privkey,keyboard-interactive". The order of the methods is perserved. + "agent,privkey,keyboard-interactive". The order of the methods is preserved. Some methods may require additional parameters. </td> </tr> diff --git a/docs/storage.html.in b/docs/storage.html.in index 6a32c95..2706bc5 100644 --- a/docs/storage.html.in +++ b/docs/storage.html.in @@ -581,7 +581,7 @@ </target> </volume></pre> - <h3>Example disk attachement</h3> + <h3>Example disk attachment</h3> <p>RBD images can be attached to Qemu guests when Qemu is built with RBD support. Information about attaching a RBD image to a guest can be found -- 1.8.1.4

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[libvirt] FYI: Wiki account self-registration disabled
by Daniel P. Berrange 29 Nov '13

29 Nov '13

Unfortunately evil spammers have managed to defeat all the anti-spam measures we've tried with the wiki. So it is with regret that we have had to disable new wiki account self-registration. We do still welcome contributions from anyone interested in adding wiki content. We just ask that you send a mail to the main devel mailing list (libvir-list(a)redhat.com) to request an account be created for you by the wiki admin. Meanwhile we're hoping to migrate the wiki to new hosting service where we'll be able to deploy newer wiki software and thus hopefully better anti-spam measures. When this happens we'll look at re-enabling self-registration of accounts. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|

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[libvirt] [PATCH] Fix memory leak in virNWFilterDefParseXML()
by Nehal J Wani 29 Nov '13

29 Nov '13

While running nwfilterxml2xmltest, it was found that valgrind pointed out the following error... ==7466== 16 bytes in 1 blocks are definitely lost in loss record 26 of 90 ==7466== at 0x4A06B6F: calloc (vg_replace_malloc.c:593) ==7466== by 0x4C651AD: virAlloc (viralloc.c:142) ==7466== by 0x4D0450D: virNWFilterDefParseNode (nwfilter_conf.c:2575) ==7466== by 0x4D05D84: virNWFilterDefParse (nwfilter_conf.c:2647) ==7466== by 0x401FDE: testCompareXMLToXMLHelper (nwfilterxml2xmltest.c:39) ==7466== by 0x402DE1: virtTestRun (testutils.c:138) ==7466== by 0x4018E9: mymain (nwfilterxml2xmltest.c:111) ==7466== by 0x403482: virtTestMain (testutils.c:593) ==7466== by 0x341F421A04: (below main) (libc-start.c:225) ...21 times, which are related to 21 tests in nwfilterxml2xmltest.c which sent EXPECT_WARN = false. There were two scenarios in virNWFilterDefParseXML(), when the variable 'entry' was malloc'ed, but not freed. --- src/conf/nwfilter_conf.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/src/conf/nwfilter_conf.c b/src/conf/nwfilter_conf.c index 793cb0e..ee26a62 100644 --- a/src/conf/nwfilter_conf.c +++ b/src/conf/nwfilter_conf.c @@ -2576,11 +2576,15 @@ virNWFilterDefParseXML(xmlXPathContextPtr ctxt) { goto cleanup; if (xmlStrEqual(curr->name, BAD_CAST "rule")) { - if (!(entry->rule = virNWFilterRuleParse(curr))) + if (!(entry->rule = virNWFilterRuleParse(curr))) { + VIR_FREE(entry); goto cleanup; + } } else if (xmlStrEqual(curr->name, BAD_CAST "filterref")) { - if (!(entry->include = virNWFilterIncludeParse(curr))) + if (!(entry->include = virNWFilterIncludeParse(curr))) { + VIR_FREE(entry); goto cleanup; + } } if (entry->rule || entry->include) { -- 1.8.1.4

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[libvirt] [PATCH v2] virObject: Error on suspicious ref and unref
by Michal Privoznik 29 Nov '13

29 Nov '13

https://bugzilla.redhat.com/show_bug.cgi?id=1033061 Since our transformation into virObject is not complete and we must do ref and unref ourselves there's a chance that we will get it wrong. That is, while one thread is doing unref and subsequent dispose another thread may come and do the ref & unref on stale pointer. This results in dispose being called twice (and possibly simultaneously). These kind of errors are hard to catch so we should at least throw an error into logs if such situation occurs. In fact, I've seen a stack trace showing this error had happen (obj = 0x7f4968018260): Thread 2 (Thread 0x7f498596b880 (LWP 13394)): [...] #4 0x00007f496ff44607 in ncf_close (ncf=0x7f496801e3d0) at netcf.c:101 __PRETTY_FUNCTION__ = "ncf_close" #5 0x00007f4984f3f31b in virObjectUnref (anyobj=<optimized out>) at util/virobject.c:262 klass = 0x7f4968019020 obj = 0x7f4968018260 lastRef = true __func__ = "virObjectUnref" #6 0x00007f4970159785 in netcfStateCleanup () at interface/interface_backend_netcf.c:109 No locals. #7 0x00007f4984fc0e28 in virStateCleanup () at libvirt.c:883 i = 6 ret = 0 #8 0x00007f49859b55fd in main (argc=<optimized out>, argv=<optimized out>) at libvirtd.c:1549 srv = 0x7f498696ed00 remote_config_file = 0x0 statuswrite = -1 ret = <optimized out> pid_file_fd = 5 pid_file = 0x0 sock_file = 0x0 sock_file_ro = 0x0 timeout = -1 verbose = 0 godaemon = 0 ipsock = 0 config = 0x7f498696e760 privileged = <optimized out> implicit_conf = <optimized out> run_dir = 0x0 old_umask = <optimized out> opts = {{name = 0x7f49859e2b53 "verbose", has_arg = 0, flag = 0x7fff45057808, val = 118}, {name = 0x7f49859e2b5b "daemon", has_arg = 0, flag = 0x7fff4505780c, val = 100}, {name = 0x7f49859e2b62 "listen", has_arg = 0, flag = 0x7fff45057810, val = 108}, {name = 0x7f49859e2c9f "config", has_arg = 1, flag = 0x0, val = 102}, {name = 0x7f49859e2c00 "timeout", has_arg = 1, flag = 0x0, val = 116}, {name = 0x7f49859e2b69 "pid-file", has_arg = 1, flag = 0x0, val = 112}, {name = 0x7f49859e2b72 "version", has_arg = 0, flag = 0x0, val = 86}, {name = 0x7f49859e2b7a "help", has_arg = 0, flag = 0x0, val = 104}, {name = 0x0, has_arg = 0, flag = 0x0, val = 0}} __func__ = "main" Thread 1 (Thread 0x7f496d6a4700 (LWP 13405)): [...] #6 0x00007f496ff44607 in ncf_close (ncf=0x7f496801e3d0) at netcf.c:101 __PRETTY_FUNCTION__ = "ncf_close" #7 0x00007f4984f3f31b in virObjectUnref (anyobj=<optimized out>) at util/virobject.c:262 klass = 0x7f4968019020 obj = 0x7f4968018260 lastRef = true __func__ = "virObjectUnref" #8 0x00007f4970157752 in netcfInterfaceClose (conn=0x7f49680a3260) at interface/interface_backend_netcf.c:265 No locals. #9 0x00007f4984fb7984 in virConnectDispose (obj=0x7f49680a3260) at datatypes.c:149 conn = 0x7f49680a3260 #10 0x00007f4984f3f31b in virObjectUnref (anyobj=anyobj@entry=0x7f49680a3260) at util/virobject.c:262 klass = 0x7f49681d6760 obj = 0x7f49680a3260 lastRef = true __func__ = "virObjectUnref" #11 0x00007f4984fc11bf in virConnectClose (conn=conn@entry=0x7f49680a3260) at libvirt.c:1532 __func__ = "virConnectClose" __FUNCTION__ = "virConnectClose" #12 0x00007f496eced281 in virLXCProcessAutostartAll (driver=0x7f49681ffaa0) at lxc/lxc_process.c:1426 conn = 0x7f49680a3260 data = {driver = 0x7f49681ffaa0, conn = 0x7f49680a3260} #13 0x00007f4984fc0d21 in virStateInitialize (privileged=true, callback=callback@entry=0x7f49859b7180 <daemonInhibitCallback>, opaque=opaque@entry=0x7f498696ed00) at libvirt.c:864 i = 8 __func__ = "virStateInitialize" #14 0x00007f49859b71db in daemonRunStateInit (opaque=opaque@entry=0x7f498696ed00) at libvirtd.c:906 srv = 0x7f498696ed00 sysident = 0x7f4968000ae0 __func__ = "daemonRunStateInit" #15 0x00007f4984f4efe1 in virThreadHelper (data=<optimized out>) at util/virthreadpthread.c:161 args = 0x0 local = {func = 0x7f49859b71a0 <daemonRunStateInit>, opaque = 0x7f498696ed00} #16 0x00007f4982a40de3 in start_thread (arg=0x7f496d6a4700) at pthread_create.c:308 __res = <optimized out> pd = 0x7f496d6a4700 now = <optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139953345021696, 7118305506502180663, 0, 139953345022400, 139953345021696, 140734351374104, -7179978120810397897, -7180347023594422473}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = <optimized out> pagesize_m1 = <optimized out> sp = <optimized out> freesize = <optimized out> #17 0x00007f498236716d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com> --- diff to v1: - s/virReportError/VIR_ERROR/ - fix bool = int assignment src/nwfilter/nwfilter_dhcpsnoop.c | 6 ++--- src/util/viratomic.h | 53 +++++++++++++++++++++++++++++++-------- src/util/virobject.c | 13 +++++++--- 3 files changed, 54 insertions(+), 18 deletions(-) diff --git a/src/nwfilter/nwfilter_dhcpsnoop.c b/src/nwfilter/nwfilter_dhcpsnoop.c index e8fcfef..71380bb 100644 --- a/src/nwfilter/nwfilter_dhcpsnoop.c +++ b/src/nwfilter/nwfilter_dhcpsnoop.c @@ -893,7 +893,7 @@ virNWFilterSnoopReqLeaseDel(virNWFilterSnoopReqPtr req, skip_instantiate: VIR_FREE(ipl); - virAtomicIntDecAndTest(&virNWFilterSnoopState.nLeases); + virAtomicIntDec(&virNWFilterSnoopState.nLeases); lease_not_found: VIR_FREE(ipstr); @@ -1169,7 +1169,7 @@ static void virNWFilterDHCPDecodeWorker(void *jobdata, void *opaque) _("Instantiation of rules failed on " "interface '%s'"), req->ifname); } - virAtomicIntDecAndTest(job->qCtr); + virAtomicIntDec(job->qCtr); VIR_FREE(job); } @@ -1562,7 +1562,7 @@ exit: pcap_close(pcapConf[i].handle); } - virAtomicIntDecAndTest(&virNWFilterSnoopState.nThreads); + virAtomicIntDec(&virNWFilterSnoopState.nThreads); return; } diff --git a/src/util/viratomic.h b/src/util/viratomic.h index 4d7f7e5..48450b9 100644 --- a/src/util/viratomic.h +++ b/src/util/viratomic.h @@ -68,6 +68,18 @@ VIR_STATIC int virAtomicIntInc(volatile int *atomic) ATTRIBUTE_NONNULL(1); /** + * virAtomicIntDec: + * Decrements the value of atomic by 1. + * + * Think of this operation as an atomic version of + * { *atomic -= 1; return *atomic == 0; } + * + * This call acts as a full compiler and hardware memory barrier. + */ +VIR_STATIC int virAtomicIntDec(volatile int *atomic) + ATTRIBUTE_NONNULL(1); + +/** * virAtomicIntDecAndTest: * Decrements the value of atomic by 1. * @@ -75,6 +87,8 @@ VIR_STATIC int virAtomicIntInc(volatile int *atomic) * { *atomic -= 1; return *atomic == 0; } * * This call acts as a full compiler and hardware memory barrier. + * Returns true if the resulting decremented value is zero, + * false otherwise. */ VIR_STATIC bool virAtomicIntDecAndTest(volatile int *atomic) ATTRIBUTE_NONNULL(1); @@ -176,12 +190,15 @@ VIR_STATIC unsigned int virAtomicIntXor(volatile unsigned int *atomic, (void)(0 ? *(atomic) ^ *(atomic) : 0); \ __sync_add_and_fetch((atomic), 1); \ })) +# define virAtomicIntDec(atomic) \ + (__extension__ ({ \ + (void)verify_true(sizeof(*(atomic)) == sizeof(int)); \ + (void)(0 ? *(atomic) ^ *(atomic) : 0); \ + __sync_sub_and_fetch((atomic), 1); \ + })) # define virAtomicIntDecAndTest(atomic) \ - (__extension__ ({ \ - (void)verify_true(sizeof(*(atomic)) == sizeof(int)); \ - (void)(0 ? *(atomic) ^ *(atomic) : 0); \ - __sync_fetch_and_sub((atomic), 1) == 1; \ - })) + (virAtomicIntDec(atomic) == 0) + # define virAtomicIntCompareExchange(atomic, oldval, newval) \ (__extension__ ({ \ (void)verify_true(sizeof(*(atomic)) == sizeof(int)); \ @@ -252,10 +269,16 @@ virAtomicIntInc(volatile int *atomic) return InterlockedIncrement((volatile LONG *)atomic); } +static inline int +virAtomicIntDec(volatile int *atomic) +{ + return InterlockedDecrement((volatile LONG *)atomic); +} + static inline bool virAtomicIntDecAndTest(volatile int *atomic) { - return InterlockedDecrement((volatile LONG *)atomic) == 0; + return virAtomicIntDec(atomic) == 0; } static inline bool @@ -334,16 +357,22 @@ virAtomicIntInc(volatile int *atomic) return value; } -static inline bool -virAtomicIntDecAndTest(volatile int *atomic) +static inline int +virAtomicIntDec(volatile int *atomic) { - bool is_zero; + int value; pthread_mutex_lock(&virAtomicLock); - is_zero = --(*atomic) == 0; + value = --(*atomic); pthread_mutex_unlock(&virAtomicLock); - return is_zero; + return value; +} + +static inline bool +virAtomicIntDecAndTest(volatile int *atomic) +{ + return virAtomicIntDec(atomic) == 0; } static inline bool @@ -436,6 +465,8 @@ virAtomicIntXor(volatile unsigned int *atomic, virAtomicIntSet((int *)atomic, val) # define virAtomicIntInc(atomic) \ virAtomicIntInc((int *)atomic) +# define virAtomicIntDec(atomic) \ + virAtomicIntDec((int *)atomic) # define virAtomicIntDecAndTest(atomic) \ virAtomicIntDecAndTest((int *)atomic) # define virAtomicIntCompareExchange(atomic, oldval, newval) \ diff --git a/src/util/virobject.c b/src/util/virobject.c index 61b5413..a398ab5 100644 --- a/src/util/virobject.c +++ b/src/util/virobject.c @@ -252,9 +252,9 @@ bool virObjectUnref(void *anyobj) if (!obj) return false; - bool lastRef = virAtomicIntDecAndTest(&obj->refs); + int newRefs = virAtomicIntDec(&obj->refs); PROBE(OBJECT_UNREF, "obj=%p", obj); - if (lastRef) { + if (newRefs == 0) { PROBE(OBJECT_DISPOSE, "obj=%p", obj); virClassPtr klass = obj->klass; while (klass) { @@ -268,9 +268,11 @@ bool virObjectUnref(void *anyobj) obj->magic = 0xDEADBEEF; obj->klass = (void*)0xDEADBEEF; VIR_FREE(obj); + } else if (newRefs < 0) { + VIR_ERROR(_("Suspicious unrefing of object %p"), anyobj); } - return !lastRef; + return newRefs > 0; } @@ -289,8 +291,11 @@ void *virObjectRef(void *anyobj) if (!obj) return NULL; - virAtomicIntInc(&obj->refs); + bool firstRef = virAtomicIntInc(&obj->refs) <= 1; PROBE(OBJECT_REF, "obj=%p", obj); + if (firstRef) { + VIR_ERROR(_("Suspicious refing of object %p"), anyobj); + } return anyobj; } -- 1.8.4.4

1 1

[libvirt] [PATCH] virObject: Error on suspicious ref and unref
by Michal Privoznik 28 Nov '13

28 Nov '13

https://bugzilla.redhat.com/show_bug.cgi?id=1033061 Since our transformation into virObject is not complete and we must do ref and unref ourselves there's a chance that we will get it wrong. That is, while one thread is doing unref and subsequent dispose another thread may come and do the ref & unref on stale pointer. This results in dispose being called twice (and possibly simultaneously). These kind of errors are hard to catch so we should at least throw an error into logs if such situation occurs. In fact, I've seen a stack trace showing this error had happen (obj = 0x7f4968018260): Thread 2 (Thread 0x7f498596b880 (LWP 13394)): [...] #4 0x00007f496ff44607 in ncf_close (ncf=0x7f496801e3d0) at netcf.c:101 __PRETTY_FUNCTION__ = "ncf_close" #5 0x00007f4984f3f31b in virObjectUnref (anyobj=<optimized out>) at util/virobject.c:262 klass = 0x7f4968019020 obj = 0x7f4968018260 lastRef = true __func__ = "virObjectUnref" #6 0x00007f4970159785 in netcfStateCleanup () at interface/interface_backend_netcf.c:109 No locals. #7 0x00007f4984fc0e28 in virStateCleanup () at libvirt.c:883 i = 6 ret = 0 #8 0x00007f49859b55fd in main (argc=<optimized out>, argv=<optimized out>) at libvirtd.c:1549 srv = 0x7f498696ed00 remote_config_file = 0x0 statuswrite = -1 ret = <optimized out> pid_file_fd = 5 pid_file = 0x0 sock_file = 0x0 sock_file_ro = 0x0 timeout = -1 verbose = 0 godaemon = 0 ipsock = 0 config = 0x7f498696e760 privileged = <optimized out> implicit_conf = <optimized out> run_dir = 0x0 old_umask = <optimized out> opts = {{name = 0x7f49859e2b53 "verbose", has_arg = 0, flag = 0x7fff45057808, val = 118}, {name = 0x7f49859e2b5b "daemon", has_arg = 0, flag = 0x7fff4505780c, val = 100}, {name = 0x7f49859e2b62 "listen", has_arg = 0, flag = 0x7fff45057810, val = 108}, {name = 0x7f49859e2c9f "config", has_arg = 1, flag = 0x0, val = 102}, {name = 0x7f49859e2c00 "timeout", has_arg = 1, flag = 0x0, val = 116}, {name = 0x7f49859e2b69 "pid-file", has_arg = 1, flag = 0x0, val = 112}, {name = 0x7f49859e2b72 "version", has_arg = 0, flag = 0x0, val = 86}, {name = 0x7f49859e2b7a "help", has_arg = 0, flag = 0x0, val = 104}, {name = 0x0, has_arg = 0, flag = 0x0, val = 0}} __func__ = "main" Thread 1 (Thread 0x7f496d6a4700 (LWP 13405)): [...] #6 0x00007f496ff44607 in ncf_close (ncf=0x7f496801e3d0) at netcf.c:101 __PRETTY_FUNCTION__ = "ncf_close" #7 0x00007f4984f3f31b in virObjectUnref (anyobj=<optimized out>) at util/virobject.c:262 klass = 0x7f4968019020 obj = 0x7f4968018260 lastRef = true __func__ = "virObjectUnref" #8 0x00007f4970157752 in netcfInterfaceClose (conn=0x7f49680a3260) at interface/interface_backend_netcf.c:265 No locals. #9 0x00007f4984fb7984 in virConnectDispose (obj=0x7f49680a3260) at datatypes.c:149 conn = 0x7f49680a3260 #10 0x00007f4984f3f31b in virObjectUnref (anyobj=anyobj@entry=0x7f49680a3260) at util/virobject.c:262 klass = 0x7f49681d6760 obj = 0x7f49680a3260 lastRef = true __func__ = "virObjectUnref" #11 0x00007f4984fc11bf in virConnectClose (conn=conn@entry=0x7f49680a3260) at libvirt.c:1532 __func__ = "virConnectClose" __FUNCTION__ = "virConnectClose" #12 0x00007f496eced281 in virLXCProcessAutostartAll (driver=0x7f49681ffaa0) at lxc/lxc_process.c:1426 conn = 0x7f49680a3260 data = {driver = 0x7f49681ffaa0, conn = 0x7f49680a3260} #13 0x00007f4984fc0d21 in virStateInitialize (privileged=true, callback=callback@entry=0x7f49859b7180 <daemonInhibitCallback>, opaque=opaque@entry=0x7f498696ed00) at libvirt.c:864 i = 8 __func__ = "virStateInitialize" #14 0x00007f49859b71db in daemonRunStateInit (opaque=opaque@entry=0x7f498696ed00) at libvirtd.c:906 srv = 0x7f498696ed00 sysident = 0x7f4968000ae0 __func__ = "daemonRunStateInit" #15 0x00007f4984f4efe1 in virThreadHelper (data=<optimized out>) at util/virthreadpthread.c:161 args = 0x0 local = {func = 0x7f49859b71a0 <daemonRunStateInit>, opaque = 0x7f498696ed00} #16 0x00007f4982a40de3 in start_thread (arg=0x7f496d6a4700) at pthread_create.c:308 __res = <optimized out> pd = 0x7f496d6a4700 now = <optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139953345021696, 7118305506502180663, 0, 139953345022400, 139953345021696, 140734351374104, -7179978120810397897, -7180347023594422473}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = <optimized out> pagesize_m1 = <optimized out> sp = <optimized out> freesize = <optimized out> #17 0x00007f498236716d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com> --- src/nwfilter/nwfilter_dhcpsnoop.c | 6 ++--- src/util/viratomic.h | 53 +++++++++++++++++++++++++++++++-------- src/util/virobject.c | 17 ++++++++++--- 3 files changed, 58 insertions(+), 18 deletions(-) diff --git a/src/nwfilter/nwfilter_dhcpsnoop.c b/src/nwfilter/nwfilter_dhcpsnoop.c index e8fcfef..71380bb 100644 --- a/src/nwfilter/nwfilter_dhcpsnoop.c +++ b/src/nwfilter/nwfilter_dhcpsnoop.c @@ -893,7 +893,7 @@ virNWFilterSnoopReqLeaseDel(virNWFilterSnoopReqPtr req, skip_instantiate: VIR_FREE(ipl); - virAtomicIntDecAndTest(&virNWFilterSnoopState.nLeases); + virAtomicIntDec(&virNWFilterSnoopState.nLeases); lease_not_found: VIR_FREE(ipstr); @@ -1169,7 +1169,7 @@ static void virNWFilterDHCPDecodeWorker(void *jobdata, void *opaque) _("Instantiation of rules failed on " "interface '%s'"), req->ifname); } - virAtomicIntDecAndTest(job->qCtr); + virAtomicIntDec(job->qCtr); VIR_FREE(job); } @@ -1562,7 +1562,7 @@ exit: pcap_close(pcapConf[i].handle); } - virAtomicIntDecAndTest(&virNWFilterSnoopState.nThreads); + virAtomicIntDec(&virNWFilterSnoopState.nThreads); return; } diff --git a/src/util/viratomic.h b/src/util/viratomic.h index 4d7f7e5..877900e 100644 --- a/src/util/viratomic.h +++ b/src/util/viratomic.h @@ -68,6 +68,18 @@ VIR_STATIC int virAtomicIntInc(volatile int *atomic) ATTRIBUTE_NONNULL(1); /** + * virAtomicIntDec: + * Decrements the value of atomic by 1. + * + * Think of this operation as an atomic version of + * { *atomic -= 1; return *atomic == 0; } + * + * This call acts as a full compiler and hardware memory barrier. + */ +VIR_STATIC int virAtomicIntDec(volatile int *atomic) + ATTRIBUTE_NONNULL(1); + +/** * virAtomicIntDecAndTest: * Decrements the value of atomic by 1. * @@ -75,6 +87,8 @@ VIR_STATIC int virAtomicIntInc(volatile int *atomic) * { *atomic -= 1; return *atomic == 0; } * * This call acts as a full compiler and hardware memory barrier. + * Returns true if the resulting decremented value is zero, + * false otherwise. */ VIR_STATIC bool virAtomicIntDecAndTest(volatile int *atomic) ATTRIBUTE_NONNULL(1); @@ -176,12 +190,15 @@ VIR_STATIC unsigned int virAtomicIntXor(volatile unsigned int *atomic, (void)(0 ? *(atomic) ^ *(atomic) : 0); \ __sync_add_and_fetch((atomic), 1); \ })) +# define virAtomicIntDec(atomic) \ + (__extension__ ({ \ + (void)verify_true(sizeof(*(atomic)) == sizeof(int)); \ + (void)(0 ? *(atomic) ^ *(atomic) : 0); \ + __sync_sub_and_fetch((atomic), 1); \ + })) # define virAtomicIntDecAndTest(atomic) \ - (__extension__ ({ \ - (void)verify_true(sizeof(*(atomic)) == sizeof(int)); \ - (void)(0 ? *(atomic) ^ *(atomic) : 0); \ - __sync_fetch_and_sub((atomic), 1) == 1; \ - })) + (virAtomicIntDec(atomic) == 0) + # define virAtomicIntCompareExchange(atomic, oldval, newval) \ (__extension__ ({ \ (void)verify_true(sizeof(*(atomic)) == sizeof(int)); \ @@ -252,10 +269,16 @@ virAtomicIntInc(volatile int *atomic) return InterlockedIncrement((volatile LONG *)atomic); } +static inline int +virAtomicIntDec(volatile int *atomic) +{ + return InterlockedDecrement((volatile LONG *)atomic); +} + static inline bool virAtomicIntDecAndTest(volatile int *atomic) { - return InterlockedDecrement((volatile LONG *)atomic) == 0; + return virAtomicIntDec(atomic) == 0; } static inline bool @@ -334,16 +357,22 @@ virAtomicIntInc(volatile int *atomic) return value; } -static inline bool -virAtomicIntDecAndTest(volatile int *atomic) +static inline int +virAtomicIntDec(volatile int *atomic) { - bool is_zero; + bool value; pthread_mutex_lock(&virAtomicLock); - is_zero = --(*atomic) == 0; + value = --(*atomic); pthread_mutex_unlock(&virAtomicLock); - return is_zero; + return value; +} + +static inline int +virAtomicIntDecAndTest(volatile int *atomic) +{ + return virAtomicIntDec(atomic) == 0; } static inline bool @@ -436,6 +465,8 @@ virAtomicIntXor(volatile unsigned int *atomic, virAtomicIntSet((int *)atomic, val) # define virAtomicIntInc(atomic) \ virAtomicIntInc((int *)atomic) +# define virAtomicIntDec(atomic) \ + virAtomicIntDec((int *)atomic) # define virAtomicIntDecAndTest(atomic) \ virAtomicIntDecAndTest((int *)atomic) # define virAtomicIntCompareExchange(atomic, oldval, newval) \ diff --git a/src/util/virobject.c b/src/util/virobject.c index 61b5413..4299432 100644 --- a/src/util/virobject.c +++ b/src/util/virobject.c @@ -252,9 +252,9 @@ bool virObjectUnref(void *anyobj) if (!obj) return false; - bool lastRef = virAtomicIntDecAndTest(&obj->refs); + int newRefs = virAtomicIntDec(&obj->refs); PROBE(OBJECT_UNREF, "obj=%p", obj); - if (lastRef) { + if (newRefs == 0) { PROBE(OBJECT_DISPOSE, "obj=%p", obj); virClassPtr klass = obj->klass; while (klass) { @@ -268,9 +268,13 @@ bool virObjectUnref(void *anyobj) obj->magic = 0xDEADBEEF; obj->klass = (void*)0xDEADBEEF; VIR_FREE(obj); + } else if (newRefs < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("Suspicious unrefing of object %p"), + anyobj); } - return !lastRef; + return newRefs > 0; } @@ -289,8 +293,13 @@ void *virObjectRef(void *anyobj) if (!obj) return NULL; - virAtomicIntInc(&obj->refs); + bool firstRef = virAtomicIntInc(&obj->refs) <= 1; PROBE(OBJECT_REF, "obj=%p", obj); + if (firstRef) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("Suspicious refing of object %p"), + anyobj); + } return anyobj; } -- 1.8.4.4

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[libvirt] What to do about the qemu "-boot strict" option
by Laine Stump 28 Nov '13

28 Nov '13

Awhile back a bug was filed against libvirt about the inability to completely exclude a disk from the boot order: https://bugzilla.redhat.com/show_bug.cgi?id=888635 In short, you can't have a domain that used PXE to boot, but also has an un-bootable disk device *even if that disk isn't listed in the boot order*, because if PXE times out (e.g. due to the bridge forwarding delay), the BIOS will move on to the next target, which will be the unbootable disk device (again - even though it wasn't given a boot order), and get stuck at a "/BOOT DISK FAILURE, PRESS ANY KEY" message /until a user intervenes. It was obviously beyond the ability of libvirt to fix this (although it can be worked around by creating a very small disk image with a bootloader that merely instructs the system to reboot, and placing *that* disk in the boot order just after the PXE device), so the BZ was closed as CANTFIX. A couple days ago I noticed that Amos Kong had later actually fixed this problem in seabios and qemu: https://bugzilla.redhat.com/show_bug.cgi?id=888633 https://bugzilla.redhat.com/show_bug.cgi?id=903204 Existing behavior is preserved though, and the new behavior only comes about if "-boot strict" is specified on the qemu commandline. It definitely seems desirable to have this ability in libvirt, but I'm almost of the opinion that this should *always* be the behavior (if you want all devices to be in the boot order, you can just give all of them (or none of them, if you're feeling adventurous) a boot order ranking). But I thought it would be prudent to ask opinions about that before making any patch. So what are the opinions? Should the "if any devices are given a boot order, only attempt to boot from devices that have a boot order specified" behavior just be the default (and only) behavior when qemu/seabios supports it? (this would imply that the old behavior is just a bug)? Or do we need to make it configurable? If it needs to be configurable, the boot-related xml seems to be a bit unorganized (a flat list of elements with mostly a single attribute for each), but I suppose this could be added as a new attribute to the <bios> element...

4 4