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From aad2de527db618942ce1f5cad0d9c2e29ec42f2e Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Thu, 19 Oct 2017 01:34:50 +0200
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Subject: [PATCH 61/69] iothread: Make iothread_stop() idempotent
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RH-Author: Eduardo Habkost <ehabkost@redhat.com>
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Message-id: <20171019013453.21449-2-ehabkost@redhat.com>
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Patchwork-id: 77367
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O-Subject: [RHV7.5 qemu-kvm-rhev PATCH 1/4] iothread: Make iothread_stop() idempotent
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Bugzilla: 1460848
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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Currently, iothread_stop_all() makes all iothread objects unsafe
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to be destroyed, because qemu_thread_join() ends up being called
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twice.
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To fix this, make iothread_stop() idempotent by checking
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thread->stopped.
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Fixes the following crash:
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qemu-system-x86_64 -object iothread,id=iothread0 -monitor stdio -display none
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QEMU 2.10.50 monitor - type 'help' for more information
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(qemu) quit
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qemu: qemu_thread_join: No such process
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Aborted (core dumped)
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Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Message-Id: <20170926130028.12471-1-ehabkost@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 65072c157e466db2785748a929e775703b20eefe)
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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iothread.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/iothread.c b/iothread.c
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index beeb870..d67bdd4 100644
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--- a/iothread.c
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+++ b/iothread.c
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@@ -68,7 +68,7 @@ static int iothread_stop(Object *object, void *opaque)
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IOThread *iothread;
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iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD);
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- if (!iothread || !iothread->ctx) {
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+ if (!iothread || !iothread->ctx || iothread->stopping) {
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return 0;
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}
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iothread->stopping = true;
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--
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1.8.3.1
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