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iothread: Make iothread_stop() idempotent

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Currently, iothread_stop_all() makes all iothread objects unsafe
to be destroyed, because qemu_thread_join() ends up being called
twice.

To fix this, make iothread_stop() idempotent by checking
thread->stopped.

Fixes the following crash:

  qemu-system-x86_64 -object iothread,id=iothread0 -monitor stdio -display none
  QEMU 2.10.50 monitor - type 'help' for more information
  (qemu) quit
  qemu: qemu_thread_join: No such process
  Aborted (core dumped)

Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20170926130028.12471-1-ehabkost@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eduardo Habkost 2017-09-26 10:00:28 -03:00 committed by Paolo Bonzini
parent cff3e8b8d6
commit 65072c157e
1 changed files with 1 additions and 1 deletions
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2
iothread.c
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@ -85,7 +85,7 @@ static int iothread_stop(Object *object, void *opaque)
IOThread *iothread;
iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD);
if (!iothread || !iothread->ctx) {
if (!iothread || !iothread->ctx || iothread->stopping) {
return 0;
}
iothread->stopping = true;