[Xen-devel] [PATCH] xl/libxl: fix migrate/Remus regression (core dumped)

[Yang Hongyang <yanghy@xxxxxxxxxxxxxx>]

When excuting xl migrate/Remus, the following error occurd:
[root@master xen]# xl migrate 5 slaver
migration target: Ready to receive domain.
Saving to migration stream new xl format (info 0x1/0x0/1225)
Loading new save file <incoming migration stream> (new xl fmt info 0x1/0x0/1225)
 Savefile contains xl domain config in JSON format
Parsing config from <saved>
Segmentation fault (core dumped)

This is because CTX->xce is used without been initialized.
The bug was introduced by commit 2ffeb5d7f5d8
    libxl: events: Deregister evtchn fd when not needed
which remove the initialization of xce from libxl__ctx_alloc.

This patch initialze the CTX->xce before use it.

Signed-off-by: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxl/libxl_dom.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index 74ea84b..8910b79 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -1824,6 +1824,7 @@ void libxl__domain_suspend(libxl__egc *egc, 
libxl__domain_suspend_state *dss)
     port = xs_suspend_evtchn_port(dss->domid);
 
     if (port >= 0) {
+        libxl__ctx_evtchn_init(gc);
         dss->guest_evtchn.port =
             xc_suspend_evtchn_init_exclusive(CTX->xch, CTX->xce,
                                   dss->domid, port, &dss->guest_evtchn_lockfd);
-- 
1.7.1


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