Re: [PATCH] Fix reboot command for LXC containers

The virNetDaemonQuit(dmn) command in virLXCControllerSignalChildIO triggers an early close of all clients of lxc_controller. Here, libvirtd itself is a client of this controller, and the client connection is used to notify libvirtd if a reboot of the container is required. However, the client connection was closed before such a status could be sent to libvirtd. To fix this bug, we will immediately send the reboot or shutdown status of the container to libvirtd, and only after client disconnect will we trigger virNetDaemonQuit. Fixes: #237 Bug: https://gitlab.com/libvirt/libvirt/-/issues/237 Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991773 Signed-off-by: Joachim Falk <joachim.falk(a)gmx.de&gt; --- src/lxc/lxc_controller.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c index 444f728af4..75107822ba 100644 --- a/src/lxc/lxc_controller.c +++ b/src/lxc/lxc_controller.c @@ -894,8 +894,10 @@ static void virLXCControllerClientCloseHook(virNetServerClient *client) virLXCController *ctrl = virNetServerClientGetPrivateData(client); VIR_DEBUG("Client %p has closed", client); - if (ctrl->client == client) + if (ctrl->client == client) { ctrl->client = NULL; + VIR_DEBUG("Client has gone away"); + } if (ctrl->inShutdown) { VIR_DEBUG("Arm timer to quit event loop"); virEventUpdateTimeout(ctrl->timerShutdown, 0); @@ -1006,6 +1008,9 @@ static int lxcControllerClearCapabilities(void) static bool wantReboot; static virMutex lock = VIR_MUTEX_INITIALIZER; +static int +virLXCControllerEventSendExit(virLXCController *ctrl, + int exitstatus); static void virLXCControllerSignalChildIO(virNetDaemon *dmn, siginfo_t *info G_GNUC_UNUSED, @@ -1015,10 +1020,10 @@ static void virLXCControllerSignalChildIO(virNetDaemon *dmn, int ret; int status; + ignore_value(dmn);

ret = waitpid(-1, &status, WNOHANG); VIR_DEBUG("Got sig child %d vs %lld", ret, (long long)ctrl->initpid); if (ret == ctrl->initpid) { - virNetDaemonQuit(dmn); virMutexLock(&lock); if (WIFSIGNALED(status) && WTERMSIG(status) == SIGHUP) { @@ -1026,6 +1031,7 @@ static void virLXCControllerSignalChildIO(virNetDaemon *dmn, wantReboot = true; } virMutexUnlock(&lock); + virLXCControllerEventSendExit(ctrl, wantReboot ? 1 : 0); } } @@ -2276,9 +2282,10 @@ virLXCControllerEventSendExit(virLXCController *ctrl, VIR_DEBUG("Waiting for client to complete dispatch"); ctrl->inShutdown = true; virNetServerClientDelayedClose(ctrl->client); - virNetDaemonRun(ctrl->daemon); + } else { + VIR_DEBUG("Arm timer to quit event loop"); + virEventUpdateTimeout(ctrl->timerShutdown, 0); } - VIR_DEBUG("Client has gone away"); return 0; } @@ -2430,8 +2437,6 @@ virLXCControllerRun(virLXCController *ctrl) rc = virLXCControllerMain(ctrl); - virLXCControllerEventSendExit(ctrl, rc); - cleanup: VIR_FORCE_CLOSE(control[0]); VIR_FORCE_CLOSE(control[1]);