[libvirt] [PATCH] Initialize threading & error layer in LXC controller

[Daniel P. Berrange]

From: "Daniel P. Berrange" <berrange at redhat.com>

In Fedora 20, libvirt_lxc crashes immediately at startup with a
trace

 #0  0x00007f0cddb653ec in free () from /lib64/libc.so.6
 #1  0x00007f0ce0e16f4a in virFree (ptrptr=ptrptr at entry=0x7f0ce1830058) at util/viralloc.c:580
 #2  0x00007f0ce0e2764b in virResetError (err=0x7f0ce1830030) at util/virerror.c:354
 #3  0x00007f0ce0e27a5a in virResetLastError () at util/virerror.c:387
 #4  0x00007f0ce0e28858 in virEventRegisterDefaultImpl () at util/virevent.c:233
 #5  0x00007f0ce0db47c6 in main (argc=11, argv=0x7fff4596c328) at lxc/lxc_controller.c:2352

Normally virInitialize calls virErrorInitialize and
virThreadInitialize, but we don't link to libvirt.so
in libvirt_lxc, and nor did we ever call the error
or thread initializers.

I have absolutely no idea how this has ever worked, let alone
what caused it to stop working in Fedora 20.

In addition not all code paths from virLogSetFromEnv will
ensure virLogInitialize is called correctly, which is another
possible crash scenario.

Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
 src/lxc/lxc_controller.c | 4 +++-
 src/util/virlog.c        | 6 ++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c
index ed73ab0..92fb2bb 100644
--- a/src/lxc/lxc_controller.c
+++ b/src/lxc/lxc_controller.c
@@ -2250,7 +2250,9 @@ int main(int argc, char *argv[])
 
     if (setlocale(LC_ALL, "") == NULL ||
         bindtextdomain(PACKAGE, LOCALEDIR) == NULL ||
-        textdomain(PACKAGE) == NULL) {
+        textdomain(PACKAGE) == NULL ||
+        virThreadInitialize() < 0 ||
+        virErrorInitialize() < 0) {
         fprintf(stderr, _("%s: initialization failed\n"), argv[0]);
         exit(EXIT_FAILURE);
     }
diff --git a/src/util/virlog.c b/src/util/virlog.c
index 047a131..a54e209 100644
--- a/src/util/virlog.c
+++ b/src/util/virlog.c
@@ -547,6 +547,9 @@ virLogDefineFilter(const char *match,
 
     virCheckFlags(VIR_LOG_STACK_TRACE, -1);
 
+    if (virLogInitialize() < 0)
+        return -1;
+
     if ((match == NULL) || (priority < VIR_LOG_DEBUG) ||
         (priority > VIR_LOG_ERROR))
         return -1;
@@ -662,6 +665,9 @@ virLogDefineOutput(virLogOutputFunc f,
 
     virCheckFlags(0, -1);
 
+    if (virLogInitialize() < 0)
+        return -1;
+
     if (f == NULL)
         return -1;
 
-- 
1.8.3.1