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From 5ca7635b41a142a709364412fb367c23ac169a21 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Fri, 22 Dec 2017 11:08:48 +0100
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Subject: [PATCH 30/42] aio: fix assert when remove poll during destroy
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RH-Author: Stefan Hajnoczi <stefanha@redhat.com>
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Message-id: <20171222110900.24813-9-stefanha@redhat.com>
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Patchwork-id: 78491
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O-Subject: [RHV7.5 qemu-kvm-rhev PATCH 08/20] aio: fix assert when remove poll during destroy
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Bugzilla: 1519721
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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After iothread is enabled internally inside QEMU with GMainContext, we
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may encounter this warning when destroying the iothread:
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(qemu-system-x86_64:19925): GLib-CRITICAL **: g_source_remove_poll:
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assertion '!SOURCE_DESTROYED (source)' failed
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The problem is that g_source_remove_poll() does not allow to remove one
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source from array if the source is detached from its owner
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context. (peterx: which IMHO does not make much sense)
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Fix it on QEMU side by avoid calling g_source_remove_poll() if we know
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the object is during destruction, and we won't leak anything after all
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since the array will be gone soon cleanly even with that fd.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Message-id: 20170928025958.1420-6-peterx@redhat.com
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[peterx: write the commit message]
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit f708a5e71cba0d784e307334c07ade5f56f827ab)
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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util/aio-posix.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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diff --git a/util/aio-posix.c b/util/aio-posix.c
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index 2d51239..5946ac0 100644
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--- a/util/aio-posix.c
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+++ b/util/aio-posix.c
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@@ -223,7 +223,14 @@ void aio_set_fd_handler(AioContext *ctx,
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return;
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}
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- g_source_remove_poll(&ctx->source, &node->pfd);
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+ /* If the GSource is in the process of being destroyed then
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+ * g_source_remove_poll() causes an assertion failure. Skip
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+ * removal in that case, because glib cleans up its state during
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+ * destruction anyway.
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+ */
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+ if (!g_source_is_destroyed(&ctx->source)) {
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+ g_source_remove_poll(&ctx->source, &node->pfd);
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+ }
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/* If the lock is held, just mark the node as deleted */
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if (qemu_lockcnt_count(&ctx->list_lock)) {
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--
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1.8.3.1
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