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authorStefan Hajnoczi <stefanha@redhat.com>2017-09-28 10:59:58 +0800
committerStefan Hajnoczi <stefanha@redhat.com>2017-10-03 14:36:19 -0400
commitf708a5e71cba0d784e307334c07ade5f56f827ab (patch)
tree8e4786bfdf43921d8ff54aa6cf279769612d184d /util/aio-posix.c
parent5b3ac23fee97fc1a79ad2bb1cf3a1ce518d27905 (diff)
aio: fix assert when remove poll during destroy
After iothread is enabled internally inside QEMU with GMainContext, we may encounter this warning when destroying the iothread: (qemu-system-x86_64:19925): GLib-CRITICAL **: g_source_remove_poll: assertion '!SOURCE_DESTROYED (source)' failed The problem is that g_source_remove_poll() does not allow to remove one source from array if the source is detached from its owner context. (peterx: which IMHO does not make much sense) Fix it on QEMU side by avoid calling g_source_remove_poll() if we know the object is during destruction, and we won't leak anything after all since the array will be gone soon cleanly even with that fd. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-id: 20170928025958.1420-6-peterx@redhat.com [peterx: write the commit message] Signed-off-by: Peter Xu <peterx@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'util/aio-posix.c')
-rw-r--r--util/aio-posix.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/util/aio-posix.c b/util/aio-posix.c
index 2d51239ec6..5946ac09f0 100644
--- a/util/aio-posix.c
+++ b/util/aio-posix.c
@@ -223,7 +223,14 @@ void aio_set_fd_handler(AioContext *ctx,
return;
}
- g_source_remove_poll(&ctx->source, &node->pfd);
+ /* If the GSource is in the process of being destroyed then
+ * g_source_remove_poll() causes an assertion failure. Skip
+ * removal in that case, because glib cleans up its state during
+ * destruction anyway.
+ */
+ if (!g_source_is_destroyed(&ctx->source)) {
+ g_source_remove_poll(&ctx->source, &node->pfd);
+ }
/* If the lock is held, just mark the node as deleted */
if (qemu_lockcnt_count(&ctx->list_lock)) {