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Tue, 11 Sep 2018 12:21:45 +0000 (UTC) X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" user run "firewalld-cmd --reload" nwfilterStateReload called in main thread step 1. virRWLockWrite(&updateLock) step 2. virNWFilterLoadAllConfigs step 3. virRWLockUnlock(&updateLock); lauch a vm: qemuDomainCreateXML runs in other thread step 1. virRWLockRead(&updateLock); step 2. qemuProcessStart step 3. qemuProcessWaitForMonitor step 4. ... step 5 virRWLockUnlock(&updateLock); if nwfilterStateReload called in the middle of step 1 and step 5 of qemuDomainCreateXML, it can't get the updateLock and then block the event_l= oop, so event_loop can't handle the qemu-monitor messages, cause deadlock move nwfilterStateReload into thread to fix this problem. Signed-off-by: Wang Yechao Reviewed-by: Wang Yi --- src/nwfilter/nwfilter_driver.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/src/nwfilter/nwfilter_driver.c b/src/nwfilter/nwfilter_driver.c index 1ee5162..8dcc40b 100644 --- a/src/nwfilter/nwfilter_driver.c +++ b/src/nwfilter/nwfilter_driver.c @@ -80,18 +80,27 @@ static void nwfilterDriverUnlock(void) } =20 #if HAVE_FIREWALLD +static void nwfilterReloadThread(void *opaque ATTRIBUTE_UNUSED) +{ + nwfilterStateReload(); +} =20 static DBusHandlerResult nwfilterFirewalldDBusFilter(DBusConnection *connection ATTRIBUTE_UNUSED, DBusMessage *message, void *user_data ATTRIBUTE_UNUSED) { + virThread thread; + if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged") || dbus_message_is_signal(message, "org.fedoraproject.FirewallD1", "Reloaded")) { VIR_DEBUG("Reload in nwfilter_driver because of firewalld."); - nwfilterStateReload(); + + if (virThreadCreate(&thread, false, nwfilterReloadThread, NULL) < = 0) { + VIR_ERROR("create nwfilterThread failed."); + } } =20 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; --=20 1.8.3.1 -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list