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Add fix for bsc#936185 to Factory

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OBS-URL: https://build.opensuse.org/package/show/Virtualization/libvirt?expand=0&rev=473
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James Fehlig 2015-07-31 18:53:33 +00:00 committed by Git OBS Bridge
parent 2f5a2436b0
commit dd862584c2
5 changed files with 235 additions and 0 deletions
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108
0003-libxl-fix-ref-counting-of-libxlMigrationDstArgs.patch Normal file
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@ -0,0 +1,108 @@
From 68ccc0077c7f5af07ccf6992192bfc924d0fdd83 Mon Sep 17 00:00:00 2001
From: Jim Fehlig <jfehlig@suse.com>
Date: Thu, 16 Jul 2015 14:51:30 -0600
Subject: libxl: fix ref counting of libxlMigrationDstArgs
This patch fixes some flawed logic around ref counting the
libxlMigrationDstArgs object.
First, when adding sockets to the event loop with
virNetSocketAddIOCallback(), the generic virObjectFreeCallback()
was registered as a free function, with libxlMigrationDstArgs as
its parameter. A reference was also taken on
libxlMigrationDstArgs for each successful call to
virNetSocketAddIOCallback(). The rational behind this logic was
that the libxlMigrationDstArgs object had to out-live the socket
objects. But virNetSocketAddIOCallback() already takes a
reference on socket objects, ensuring their life until removed
from the event loop and unref'ed in virNetSocketEventFree(). We
only need to ensure libxlMigrationDstArgs lives until
libxlDoMigrateReceive() finishes, which can be done by simply
unref'ing libxlMigrationDstArgs at the end of
libxlDoMigrateReceive().
The second flaw was unref'ing the sockets in the failure path of
libxlMigrateReceive() and at the end of libxlDoMigrateReceive().
As mentioned above, the sockets are already unref'ed by
virNetSocketEventFree() when removed from the event loop.
Attempting to unref the socket a second time resulted in a
libvirtd crash since the socket was previously unref'ed and
disposed.
Signed-off-by: Jim Fehlig <jfehlig@suse.com>
---
src/libxl/libxl_migration.c | 18 +++++-------------
1 file changed, 5 insertions(+), 13 deletions(-)
Index: libvirt-1.2.17/src/libxl/libxl_migration.c
===================================================================
--- libvirt-1.2.17.orig/src/libxl/libxl_migration.c
+++ libvirt-1.2.17/src/libxl/libxl_migration.c
@@ -112,11 +112,11 @@ libxlDoMigrateReceive(void *opaque)
virNetSocketUpdateIOCallback(socks[i], 0);
virNetSocketRemoveIOCallback(socks[i]);
virNetSocketClose(socks[i]);
- virObjectUnref(socks[i]);
socks[i] = NULL;
}
args->nsocks = 0;
VIR_FORCE_CLOSE(recvfd);
+ virObjectUnref(args);
}
@@ -164,11 +164,11 @@ libxlMigrateReceive(virNetSocketPtr sock
virNetSocketUpdateIOCallback(socks[i], 0);
virNetSocketRemoveIOCallback(socks[i]);
virNetSocketClose(socks[i]);
- virObjectUnref(socks[i]);
socks[i] = NULL;
}
args->nsocks = 0;
VIR_FORCE_CLOSE(recvfd);
+ virObjectUnref(args);
}
static int
@@ -318,7 +318,7 @@ libxlDomainMigrationPrepare(virConnectPt
virNetSocketPtr *socks = NULL;
size_t nsocks = 0;
int nsocks_listen = 0;
- libxlMigrationDstArgs *args;
+ libxlMigrationDstArgs *args = NULL;
size_t i;
int ret = -1;
@@ -420,22 +420,12 @@ libxlDomainMigrationPrepare(virConnectPt
VIR_EVENT_HANDLE_READABLE,
libxlMigrateReceive,
args,
- virObjectFreeCallback) < 0)
+ NULL) < 0)
continue;
- /*
- * Successfully added sock to event loop. Take a ref on args to
- * ensure it is not freed until sock is removed from the event loop.
- * Ref is dropped in virObjectFreeCallback after being removed
- * from the event loop.
- */
- virObjectRef(args);
nsocks_listen++;
}
- /* Done with args in this function, drop reference */
- virObjectUnref(args);
-
if (!nsocks_listen)
goto error;
@@ -448,6 +438,8 @@ libxlDomainMigrationPrepare(virConnectPt
virObjectUnref(socks[i]);
}
VIR_FREE(socks);
+ virObjectUnref(args);
+
/* Remove virDomainObj from domain list */
if (vm) {
virDomainObjListRemove(driver->domains, vm);

51
0004-libxl-don-t-attempt-to-resume-domain-when-suspend-fa.patch Normal file
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@ -0,0 +1,51 @@
From 13d53b7763d3d93339cc33a19845bdd623524b81 Mon Sep 17 00:00:00 2001
From: Jim Fehlig <jfehlig@suse.com>
Date: Thu, 16 Jul 2015 14:51:31 -0600
Subject: libxl: don't attempt to resume domain when suspend fails
Failure of libxl_domain_suspend() does not leave the domain in
a suspended state, so no need to call libxl_domain_resume(),
which btw will fail with "domain not suspended".
Signed-off-by: Jim Fehlig <jfehlig@suse.com>
---
src/libxl/libxl_migration.c | 14 --------------
1 file changed, 14 deletions(-)
Index: libvirt-1.2.17/src/libxl/libxl_migration.c
===================================================================
--- libvirt-1.2.17.orig/src/libxl/libxl_migration.c
+++ libvirt-1.2.17/src/libxl/libxl_migration.c
@@ -178,7 +178,6 @@ libxlDoMigrateSend(libxlDriverPrivatePtr
int sockfd)
{
libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
- virObjectEventPtr event = NULL;
int xl_flags = 0;
int ret;
@@ -188,24 +187,11 @@ libxlDoMigrateSend(libxlDriverPrivatePtr
ret = libxl_domain_suspend(cfg->ctx, vm->def->id, sockfd,
xl_flags, NULL);
if (ret != 0) {
- /* attempt to resume the domain on failure */
- if (libxl_domain_resume(cfg->ctx, vm->def->id, 1, 0) != 0) {
- VIR_DEBUG("Failed to resume domain following failed migration");
- virDomainObjSetState(vm, VIR_DOMAIN_PAUSED,
- VIR_DOMAIN_PAUSED_MIGRATION);
- event = virDomainEventLifecycleNewFromObj(vm, VIR_DOMAIN_EVENT_SUSPENDED,
- VIR_DOMAIN_EVENT_SUSPENDED_MIGRATED);
- ignore_value(virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm));
- }
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Failed to send migration data to destination host"));
ret = -1;
- goto cleanup;
}
- cleanup:
- if (event)
- libxlDomainEventQueue(driver, event);
virObjectUnref(cfg);
return ret;
}

61
0005-libxl-acquire-a-job-when-receiving-a-migrating-domai.patch Normal file
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@ -0,0 +1,61 @@
From 710088061fb3caaf3d56888b05ad2d331a740d07 Mon Sep 17 00:00:00 2001
From: Jim Fehlig <jfehlig@suse.com>
Date: Thu, 16 Jul 2015 14:51:32 -0600
Subject: libxl: acquire a job when receiving a migrating domain
Commit f86ae403 moved acquiring a job from libxlDomainStart()
to its callers. One spot missed was in libxlDoMigrateReceive().
Acquire a job in libxlDoMigrateReceive() before calling
libxlDomainStart().
Signed-off-by: Jim Fehlig <jfehlig@suse.com>
---
src/libxl/libxl_migration.c | 20 +++++++++++++++++---
1 file changed, 17 insertions(+), 3 deletions(-)
Index: libvirt-1.2.17/src/libxl/libxl_migration.c
===================================================================
--- libvirt-1.2.17.orig/src/libxl/libxl_migration.c
+++ libvirt-1.2.17/src/libxl/libxl_migration.c
@@ -95,17 +95,20 @@ libxlDoMigrateReceive(void *opaque)
int recvfd = args->recvfd;
size_t i;
int ret;
+ bool remove_dom = 0;
+
+ virObjectLock(vm);
+ if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0)
+ goto cleanup;
/*
* Always start the domain paused. If needed, unpause in the
* finish phase, after transfer of the domain is complete.
*/
- virObjectLock(vm);
ret = libxlDomainStart(driver, vm, true, recvfd);
- virObjectUnlock(vm);
if (ret < 0 && !vm->persistent)
- virDomainObjListRemove(driver->domains, vm);
+ remove_dom = true;
/* Remove all listen socks from event handler, and close them. */
for (i = 0; i < nsocks; i++) {
@@ -117,6 +120,17 @@ libxlDoMigrateReceive(void *opaque)
args->nsocks = 0;
VIR_FORCE_CLOSE(recvfd);
virObjectUnref(args);
+
+ if (!libxlDomainObjEndJob(driver, vm))
+ vm = NULL;
+
+ cleanup:
+ if (remove_dom && vm) {
+ virDomainObjListRemove(driver->domains, vm);
+ vm = NULL;
+ }
+ if (vm)
+ virObjectUnlock(vm);
}

9
libvirt.changes
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@ -1,3 +1,12 @@
-------------------------------------------------------------------
Fri Jul 31 18:51:38 UTC 2015 - jfehlig@suse.com
- Fix crash in libxl driver on receiving side
0003-libxl-fix-ref-counting-of-libxlMigrationDstArgs.patch
0004-libxl-don-t-attempt-to-resume-domain-when-suspend-fa.patch
0005-libxl-acquire-a-job-when-receiving-a-migrating-domai.patch
bsc#936185
-------------------------------------------------------------------
Fri Jul 10 18:35:27 UTC 2015 - jfehlig@suse.com

6
libvirt.spec
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@ -454,6 +454,9 @@ Patch4: 45697fe5-libxl-support-dom0.patch
Patch5: e9c27344-libxl-fix-virDomainObj-state.patch
Patch6: 4ffb21c8-libxl-dom0-state-fix.patch
# Patches pending upstream review
Patch100: 0003-libxl-fix-ref-counting-of-libxlMigrationDstArgs.patch
Patch101: 0004-libxl-don-t-attempt-to-resume-domain-when-suspend-fa.patch
Patch102: 0005-libxl-acquire-a-job-when-receiving-a-migrating-domai.patch
# Need to go upstream
Patch150: xen-pv-cdrom.patch
Patch151: blockcopy-check-dst-identical-device.patch
@ -991,6 +994,9 @@ Provides a dissector for the libvirt RPC protocol to help debugging it.
%patch4 -p1
%patch5 -p1
%patch6 -p1
%patch100 -p1
%patch101 -p1
%patch102 -p1
%patch150 -p1
%patch151 -p1
%patch152 -p1