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[libvirt] [PATCH] spec: mark directories in /var/run as ghosts
by Eric Blake 30 Nov '11

30 Nov '11

We have several directories that are created on the fly, and which only contain state relevant to a running libvirtd process (all located in /var/run). Since the directories are created as needed, and make no sense without a running libvirtd, we want them deleted if libvirt is uninstalled. And in F15 and newer, /var/run is on tmpfs (forcing us to recreate on the fly); which means that someone trying to verify a complete rpm will fail if the directory does not currently exist because libvirtd has not been started since boot. The solution, then, is to mark the directories as %ghost, so that rpm knows that we own them and will clean it up if libvirt is uninstalled, but will no longer create the directory for us at install, nor complain at verify time if the directory does not exist. See https://bugzilla.redhat.com/show_bug.cgi?id=656611. * libvirt.spec.in (%files): Add %ghost to temporary directories that we don't install, but want cleaned up on libvirt removal. --- libvirt.spec.in | 12 ++++++------ 1 files changed, 6 insertions(+), 6 deletions(-) diff --git a/libvirt.spec.in b/libvirt.spec.in index f61a243..06c949b 100644 --- a/libvirt.spec.in +++ b/libvirt.spec.in @@ -1082,7 +1082,7 @@ rm -f $RPM_BUILD_ROOT%{_sysconfdir}/sysctl.d/libvirtd %{_datadir}/libvirt/networks/default.xml %endif -%dir %{_localstatedir}/run/libvirt/ +%ghost %dir %{_localstatedir}/run/libvirt/ %dir %attr(0711, root, root) %{_localstatedir}/lib/libvirt/images/ %dir %attr(0711, root, root) %{_localstatedir}/lib/libvirt/filesystems/ @@ -1090,24 +1090,24 @@ rm -f $RPM_BUILD_ROOT%{_sysconfdir}/sysctl.d/libvirtd %dir %attr(0711, root, root) %{_localstatedir}/cache/libvirt/ %if %{with_qemu} -%dir %attr(0700, root, root) %{_localstatedir}/run/libvirt/qemu/ +%ghost %dir %attr(0700, root, root) %{_localstatedir}/run/libvirt/qemu/ %dir %attr(0750, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/ %dir %attr(0750, %{qemu_user}, %{qemu_group}) %{_localstatedir}/cache/libvirt/qemu/ %endif %if %{with_lxc} -%dir %{_localstatedir}/run/libvirt/lxc/ +%ghost %dir %{_localstatedir}/run/libvirt/lxc/ %dir %attr(0700, root, root) %{_localstatedir}/lib/libvirt/lxc/ %endif %if %{with_uml} -%dir %{_localstatedir}/run/libvirt/uml/ +%ghost %dir %{_localstatedir}/run/libvirt/uml/ %dir %attr(0700, root, root) %{_localstatedir}/lib/libvirt/uml/ %endif %if %{with_libxl} -%dir %{_localstatedir}/run/libvirt/libxl/ +%ghost %dir %{_localstatedir}/run/libvirt/libxl/ %dir %attr(0700, root, root) %{_localstatedir}/lib/libvirt/libxl/ %endif %if %{with_network} -%dir %{_localstatedir}/run/libvirt/network/ +%ghost %dir %{_localstatedir}/run/libvirt/network/ %dir %attr(0700, root, root) %{_localstatedir}/lib/libvirt/network/ %dir %attr(0755, root, root) %{_localstatedir}/lib/libvirt/dnsmasq/ %endif -- 1.7.7.3

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[libvirt] [PATCH 0/6] plug memory leaks
by ajia＠redhat.com 30 Nov '11

30 Nov '11

From: Alex Jia <ajia(a)redhat.com> Detected by Coverity. Alex Jia (6): src/conf/domain_conf.c: Plug memory leak on virDomainDefParseXML() error path src/qemu/qemu_process.c: Plug memory leak on qemuProcessWaitForMonitor() error path src/rpc/virnetclient.c: Plug memory leak on virNetClientSendInternal() error path src/uml/uml_driver.c: Plug memory leak on umlStartVMDaemon() error path src/util/virnetdevbridge.c: Plug memory leak on virNetDevBridgeGet() sucessful path src/util/virnetdevmacvlan.c: Plug memory leak on virNetDevMacVLanCreateWithVPortProfile() error path Signed-off-by: Alex Jia <ajia(a)redhat.com> --- src/conf/domain_conf.c | 1 + src/qemu/qemu_process.c | 1 + src/rpc/virnetclient.c | 1 + src/uml/uml_driver.c | 1 + src/util/virnetdevbridge.c | 1 + src/util/virnetdevmacvlan.c | 1 + 6 files changed, 6 insertions(+), 0 deletions(-)

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[libvirt] 'make check' hangs
by Wen Congyang 30 Nov '11

30 Nov '11

When I run 'make check', it hangs sometimes. I use gdb to attach lt-virsh, and the following is the backtrace: (gdb) thread 1 [Switching to thread 1 (Thread 0x7fc6c04d5800 (LWP 24099))]#0 0x0000003bdce0804d in pthread_join () from /lib64/libpthread.so.0 (gdb) bt #0 0x0000003bdce0804d in pthread_join () from /lib64/libpthread.so.0 #1 0x000000000041c0b3 in vshDeinit (ctl=0x7fff015f4570) at virsh.c:17262 #2 0x00000000004248d1 in main (argc=<value optimized out>, argv=0x7fff015f4728) at virsh.c:17608 (gdb) thread 2 [Switching to thread 2 (Thread 0x7fc6c04d4700 (LWP 24138))]#0 0x0000003bdc2dc053 in poll () from /lib64/libc.so.6 (gdb) bt #0 0x0000003bdc2dc053 in poll () from /lib64/libc.so.6 #1 0x00007fc6c075359c in virEventPollRunOnce () at util/event_poll.c:619 #2 0x00007fc6c07527d7 in virEventRunDefaultImpl () at util/event.c:247 #3 0x000000000041bea3 in vshEventLoop (opaque=0x7fff015f4570) at virsh.c:16800 #4 0x00007fc6c0764702 in virThreadHelper (data=<value optimized out>) at util/threads-pthread.c:157 #5 0x0000003bdce077f1 in start_thread () from /lib64/libpthread.so.0 #6 0x0000003bdc2e570d in clone () from /lib64/libc.so.6 (gdb)

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[libvirt] [PATCH] virsh: Fix possible deadlock when virsh is about to exit
by Jiri Denemark 30 Nov '11

30 Nov '11

Not only was ctl->quit accessed without a mutex but unfortunately, virEventAddTimeout only interrupts the poll when event loop is running so the hack needs to add a timeout that will make next poll return immediately without blocking. --- tools/virsh.c | 39 +++++++++++++++++++++++++++++++++------ 1 files changed, 33 insertions(+), 6 deletions(-) diff --git a/tools/virsh.c b/tools/virsh.c index 618b0c1..723ec65 100644 --- a/tools/virsh.c +++ b/tools/virsh.c @@ -251,6 +251,7 @@ typedef struct __vshControl { bool useSnapshotOld; /* cannot use virDomainSnapshotGetParent or virDomainSnapshotNumChildren */ virThread eventLoop; + virMutex lock; bool eventLoopStarted; bool quit; } __vshControl; @@ -16796,10 +16797,17 @@ vshEventLoop(void *opaque) { vshControl *ctl = opaque; - while (!ctl->quit) { - if (virEventRunDefaultImpl() < 0) { + while (1) { + bool quit; + virMutexLock(&ctl->lock); + quit = ctl->quit; + virMutexUnlock(&ctl->lock); + + if (quit) + break; + + if (virEventRunDefaultImpl() < 0) virshReportError(ctl); - } } } @@ -17235,13 +17243,18 @@ vshReadline (vshControl *ctl, const char *prompt) #endif /* !USE_READLINE */ +static void +vshDeinitTimer(int timer ATTRIBUTE_UNUSED, void *opaque ATTRIBUTE_UNUSED) +{ + /* nothing to be done here */ +} + /* * Deinitialize virsh */ static bool vshDeinit(vshControl *ctl) { - ctl->quit = true; vshReadlineDeinit(ctl); vshCloseLogFile(ctl); VIR_FREE(ctl->name); @@ -17254,15 +17267,24 @@ vshDeinit(vshControl *ctl) virResetLastError(); if (ctl->eventLoopStarted) { + int timer; + + virMutexLock(&ctl->lock); + ctl->quit = true; /* HACK: Add a dummy timeout to break event loop */ - int timer = virEventAddTimeout(-1, NULL, NULL, NULL); + timer = virEventAddTimeout(0, vshDeinitTimer, NULL, NULL); + virMutexUnlock(&ctl->lock); + + virThreadJoin(&ctl->eventLoop); + if (timer != -1) virEventRemoveTimeout(timer); - virThreadJoin(&ctl->eventLoop); ctl->eventLoopStarted = false; } + virMutexDestroy(&ctl->lock); + return true; } @@ -17543,6 +17565,11 @@ main(int argc, char **argv) return EXIT_FAILURE; } + if (virMutexInit(&ctl->lock) < 0) { + vshError(ctl, "%s", _("Failed to initialize mutex")); + return EXIT_FAILURE; + } + if (virInitialize() < 0) { vshError(ctl, "%s", _("Failed to initialize libvirt")); return EXIT_FAILURE; -- 1.7.8.rc4

4 3

[libvirt] [PATCHv2 2/6] qemu: Plug memory leak onqemuProcessWaitForMonitor() error path
by ajia＠redhat.com 30 Nov '11

30 Nov '11

From: Alex Jia <ajia(a)redhat.com> Detected by Coverity. Leak introduced in commit 109efd7. Signed-off-by: Alex Jia <ajia(a)redhat.com> --- src/qemu/qemu_process.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index 2563f97..b05c280 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -1224,7 +1224,7 @@ qemuProcessWaitForMonitor(struct qemud_driver* driver, if (VIR_ALLOC_N(buf, buf_size) < 0) { virReportOOMError(); - return -1; + goto closelog; } if (qemuProcessReadLogOutput(vm, logfd, buf, buf_size, -- 1.7.1

2 1

[libvirt] [PATCHv4 0/4] implement per-device cgroup blkio weight in qemu
by Eric Blake 30 Nov '11

30 Nov '11

v8: two new bug cleanup commits, move major()/minor() handling out of domain_conf.c into cgroup.c, and fix behavior when more than one device is listed, add a test for xml parsing. v7 was here (1-3 are already applied, 4-5 of that series are now 3-4): https://www.redhat.com/archives/libvir-list/2011-November/msg00317.html Eric Blake (2): API: prevent query of --live and --config at once qemu: fix blkiotune --live --config Hu Tao (2): blkiotune: add interface for blkiotune.device_weight blkiotune: add qemu support for blkiotune.device_weight docs/formatdomain.html.in | 29 +++- docs/schemas/domaincommon.rng | 26 ++- include/libvirt/libvirt.h.in | 10 + src/conf/domain_conf.c | 99 +++++++++- src/conf/domain_conf.h | 14 ++ src/libvirt.c | 36 +++- src/libvirt_private.syms | 2 + src/qemu/qemu_cgroup.c | 20 ++ src/qemu/qemu_driver.c | 223 +++++++++++++++++++- src/util/cgroup.c | 51 +++++ src/util/cgroup.h | 4 + .../qemuxml2argv-blkiotune-device.args | 4 + .../qemuxml2argv-blkiotune-device.xml | 36 +++ tests/qemuxml2argvtest.c | 1 + tests/qemuxml2xmltest.c | 1 + tools/virsh.c | 43 +++- tools/virsh.pod | 8 +- 17 files changed, 576 insertions(+), 31 deletions(-) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-blkiotune-device.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-blkiotune-device.xml -- 1.7.7.1

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[libvirt] [PATCH 0/2] blkiotune tweaks
by Eric Blake 30 Nov '11

30 Nov '11

As mentioned here: https://www.redhat.com/archives/libvir-list/2011-November/msg01720.html Eric Blake (2): conf: reject duplicate paths in device weights qemu: amend existing table of device weights src/conf/domain_conf.c | 10 ++++++ src/qemu/qemu_driver.c | 80 +++++++++++++++++++++++++++++++++++------------ tools/virsh.pod | 4 ++- 3 files changed, 72 insertions(+), 22 deletions(-) -- 1.7.7.3

2 5

[libvirt] [PATCH] Fix bug on setting both weight and device-weights at the same time
by Hu Tao 30 Nov '11

30 Nov '11

When setting both blkio weight and device-weights at the same time, the weight is lost. Fix it. --- tools/virsh.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/virsh.c b/tools/virsh.c index 01da8e5..af9f538 100644 --- a/tools/virsh.c +++ b/tools/virsh.c @@ -4788,14 +4788,14 @@ cmdBlkiotune(vshControl * ctl, const vshCmd * cmd) if (!virStrcpy(temp->field, VIR_DOMAIN_BLKIO_WEIGHT, sizeof(temp->field))) goto cleanup; - } - - if (device_weight) { + weight = 0; + } else if (device_weight) { temp->value.s = vshStrdup(ctl, device_weight); temp->type = VIR_TYPED_PARAM_STRING; if (!virStrcpy(temp->field, VIR_DOMAIN_BLKIO_DEVICE_WEIGHT, sizeof(temp->field))) goto cleanup; + device_weight = NULL; } } -- 1.7.3.1

2 1

[libvirt] [libvirt-glib] Fix potential race in GVirObjectConnection::domain_event_cb
by Christophe Fergeau 30 Nov '11

30 Nov '11

This method starts by looking up a domain in priv->domains, and later, depending on the kind of event that occurred, it may remove this domain from priv->domains. While the individual operations (lookup, removal) are protected by priv->lock, there is no guarantee that the looked up domain and even priv->domains will stay unchanged when priv->lock isn't held. In particular, gvir_connection_close will destroy priv->domains which will unreference all the domains it contains (potentially destroying them too), and gvir_connection_fetch_domains will change priv->domains value. To avoid these issues, this commit takes a reference on priv->domains so that it doesn't get away behind our back, and it takes a reference on the looked up domain too to ensure it stays alive for the duration of domain_event_cb run. --- libvirt-gobject/libvirt-gobject-connection.c | 17 +++++++++++------ 1 files changed, 11 insertions(+), 6 deletions(-) diff --git a/libvirt-gobject/libvirt-gobject-connection.c b/libvirt-gobject/libvirt-gobject-connection.c index 59b828d..786a026 100644 --- a/libvirt-gobject/libvirt-gobject-connection.c +++ b/libvirt-gobject/libvirt-gobject-connection.c @@ -257,6 +257,7 @@ static int domain_event_cb(virConnectPtr conn G_GNUC_UNUSED, void *opaque) { gchar uuid[VIR_UUID_STRING_BUFLEN]; + GHashTable *doms; GVirConnection *gconn = opaque; GVirDomain *gdom; GVirConnectionPrivate *priv = gconn->priv; @@ -269,14 +270,18 @@ static int domain_event_cb(virConnectPtr conn G_GNUC_UNUSED, g_debug("%s: %s event:%d, detail:%d", G_STRFUNC, uuid, event, detail); g_mutex_lock(priv->lock); - gdom = g_hash_table_lookup(priv->domains, uuid); + doms = g_hash_table_ref(priv->domains); + gdom = g_hash_table_lookup(doms, uuid); + if (gdom != NULL) + g_object_ref(G_OBJECT(gdom)); g_mutex_unlock(priv->lock); if (gdom == NULL) { gdom = GVIR_DOMAIN(g_object_new(GVIR_TYPE_DOMAIN, "handle", dom, NULL)); g_mutex_lock(priv->lock); - g_hash_table_insert(priv->domains, (gpointer)gvir_domain_get_uuid(gdom), gdom); + g_hash_table_insert(doms, (gpointer)gvir_domain_get_uuid(gdom), + g_object_ref(G_OBJECT(gdom))); g_mutex_unlock(priv->lock); } @@ -293,11 +298,10 @@ static int domain_event_cb(virConnectPtr conn G_GNUC_UNUSED, case VIR_DOMAIN_EVENT_UNDEFINED: if (detail == VIR_DOMAIN_EVENT_UNDEFINED_REMOVED) { g_mutex_lock(priv->lock); - g_hash_table_steal(priv->domains, uuid); + g_hash_table_remove(doms, uuid); g_mutex_unlock(priv->lock); g_signal_emit(gconn, signals[VIR_DOMAIN_REMOVED], 0, gdom); - g_object_unref(gdom); } else g_warn_if_reached(); break; @@ -365,11 +369,10 @@ static int domain_event_cb(virConnectPtr conn G_GNUC_UNUSED, if (virDomainIsPersistent(dom) != 1) { g_mutex_lock(priv->lock); - g_hash_table_steal(priv->domains, uuid); + g_hash_table_remove(doms, uuid); g_mutex_unlock(priv->lock); g_signal_emit(gconn, signals[VIR_DOMAIN_REMOVED], 0, gdom); - g_object_unref(gdom); } break; @@ -377,6 +380,8 @@ static int domain_event_cb(virConnectPtr conn G_GNUC_UNUSED, g_warn_if_reached(); } + g_object_unref(G_OBJECT(gdom)); + g_hash_table_unref(doms); return 0; } -- 1.7.7.3

2 1

[libvirt] [libvirt-glib] Fix gvir_config_domain_clock_set_variable_offset
by Christophe Fergeau 30 Nov '11

30 Nov '11

It was creating an extra <clock> node as a child of the "main" one which is not what was intended --- libvirt-gconfig/libvirt-gconfig-domain-clock.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/libvirt-gconfig/libvirt-gconfig-domain-clock.c b/libvirt-gconfig/libvirt-gconfig-domain-clock.c index 27d1e67..b28856c 100644 --- a/libvirt-gconfig/libvirt-gconfig-domain-clock.c +++ b/libvirt-gconfig/libvirt-gconfig-domain-clock.c @@ -121,7 +121,7 @@ void gvir_config_domain_clock_set_variable_offset(GVirConfigDomainClock *klock, g_return_if_fail(GVIR_IS_CONFIG_DOMAIN_CLOCK(klock)); - node = gvir_config_object_replace_child(GVIR_CONFIG_OBJECT(klock), "clock"); + node = gvir_config_object_get_xml_node(GVIR_CONFIG_OBJECT(klock)); if (node == NULL) return; -- 1.7.7.3

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