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[PATCH v6 5/6] net/colo-compare.c: Check that colo-compare is active
From: |
Lukas Straub |
Subject: |
[PATCH v6 5/6] net/colo-compare.c: Check that colo-compare is active |
Date: |
Fri, 22 May 2020 08:47:45 +0200 |
If the colo-compare object is removed before failover and a
checkpoint happens, qemu crashes because it tries to lock
the destroyed event_mtx in colo_notify_compares_event.
Fix this by checking if everything is initialized by
introducing a new variable colo_compare_active which
is protected by a new mutex colo_compare_mutex. The new mutex
also protects against concurrent access of the net_compares
list and makes sure that colo_notify_compares_event isn't
active while we destroy event_mtx and event_complete_cond.
With this it also is again possible to use colo without
colo-compare (periodic mode) and to use multiple colo-compare
for multiple network interfaces.
Signed-off-by: Lukas Straub <address@hidden>
Tested-by: Lukas Straub <address@hidden>
---
net/colo-compare.c | 35 +++++++++++++++++++++++++++++------
1 file changed, 29 insertions(+), 6 deletions(-)
diff --git a/net/colo-compare.c b/net/colo-compare.c
index 7886444cdf..64d2453450 100644
--- a/net/colo-compare.c
+++ b/net/colo-compare.c
@@ -54,6 +54,8 @@ static NotifierList colo_compare_notifiers =
#define REGULAR_PACKET_CHECK_MS 3000
#define DEFAULT_TIME_OUT_MS 3000
+static QemuMutex colo_compare_mutex;
+static bool colo_compare_active;
static QemuMutex event_mtx;
static QemuCond event_complete_cond;
static int event_unhandled_count;
@@ -906,6 +908,12 @@ static void check_old_packet_regular(void *opaque)
void colo_notify_compares_event(void *opaque, int event, Error **errp)
{
CompareState *s;
+ qemu_mutex_lock(&colo_compare_mutex);
+
+ if (!colo_compare_active) {
+ qemu_mutex_unlock(&colo_compare_mutex);
+ return;
+ }
qemu_mutex_lock(&event_mtx);
QTAILQ_FOREACH(s, &net_compares, next) {
@@ -919,6 +927,7 @@ void colo_notify_compares_event(void *opaque, int event,
Error **errp)
}
qemu_mutex_unlock(&event_mtx);
+ qemu_mutex_unlock(&colo_compare_mutex);
}
static void colo_compare_timer_init(CompareState *s)
@@ -1274,7 +1283,14 @@ static void colo_compare_complete(UserCreatable *uc,
Error **errp)
s->vnet_hdr);
}
+ qemu_mutex_lock(&colo_compare_mutex);
+ if (!colo_compare_active) {
+ qemu_mutex_init(&event_mtx);
+ qemu_cond_init(&event_complete_cond);
+ colo_compare_active = true;
+ }
QTAILQ_INSERT_TAIL(&net_compares, s, next);
+ qemu_mutex_unlock(&colo_compare_mutex);
s->out_sendco.s = s;
s->out_sendco.chr = &s->chr_out;
@@ -1292,9 +1308,6 @@ static void colo_compare_complete(UserCreatable *uc,
Error **errp)
g_queue_init(&s->conn_list);
- qemu_mutex_init(&event_mtx);
- qemu_cond_init(&event_complete_cond);
-
s->connection_track_table = g_hash_table_new_full(connection_key_hash,
connection_key_equal,
g_free,
@@ -1386,12 +1399,19 @@ static void colo_compare_finalize(Object *obj)
qemu_bh_delete(s->event_bh);
+ qemu_mutex_lock(&colo_compare_mutex);
QTAILQ_FOREACH(tmp, &net_compares, next) {
if (tmp == s) {
QTAILQ_REMOVE(&net_compares, s, next);
break;
}
}
+ if (QTAILQ_EMPTY(&net_compares)) {
+ colo_compare_active = false;
+ qemu_mutex_destroy(&event_mtx);
+ qemu_cond_destroy(&event_complete_cond);
+ }
+ qemu_mutex_unlock(&colo_compare_mutex);
AioContext *ctx = iothread_get_aio_context(s->iothread);
aio_context_acquire(ctx);
@@ -1419,15 +1439,18 @@ static void colo_compare_finalize(Object *obj)
object_unref(OBJECT(s->iothread));
}
- qemu_mutex_destroy(&event_mtx);
- qemu_cond_destroy(&event_complete_cond);
-
g_free(s->pri_indev);
g_free(s->sec_indev);
g_free(s->outdev);
g_free(s->notify_dev);
}
+static void __attribute__((__constructor__)) colo_compare_init_globals(void)
+{
+ colo_compare_active = false;
+ qemu_mutex_init(&colo_compare_mutex);
+}
+
static const TypeInfo colo_compare_info = {
.name = TYPE_COLO_COMPARE,
.parent = TYPE_OBJECT,
--
2.20.1
pgpi5S1iFWpLT.pgp
Description: OpenPGP digital signature
- [PATCH v6 0/6] colo-compare bugfixes, Lukas Straub, 2020/05/22
- [PATCH v6 2/6] chardev/char.c: Use qemu_co_sleep_ns if in coroutine, Lukas Straub, 2020/05/22
- [PATCH v6 1/6] net/colo-compare.c: Create event_bh with the right AioContext, Lukas Straub, 2020/05/22
- [PATCH v6 4/6] net/colo-compare.c: Only hexdump packets if tracing is enabled, Lukas Straub, 2020/05/22
- [PATCH v6 5/6] net/colo-compare.c: Check that colo-compare is active,
Lukas Straub <=
- [PATCH v6 6/6] net/colo-compare.c: Correct ordering in complete and finalize, Lukas Straub, 2020/05/22
- [PATCH v6 3/6] net/colo-compare.c: Fix deadlock in compare_chr_send, Lukas Straub, 2020/05/22