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I found upstream codes conflict with COLO and lead to crash, and I located to this patch: commit 386a907b37a9321bc5d699bc37104d6ffba1b34d Author: Wei Wang <wei.w.wang@intel.com> Date: Tue Dec 11 16:24:49 2018 +0800 migration: use bitmap_mutex in migration_bitmap_clear_dirty My colleague Wei's patch add bitmap_mutex in migration_bitmap_clear_dirty, but COLO didn't initialize the bitmap_mutex. So we always get an error when COLO start up. like that: qemu-system-x86_64: util/qemu-thread-posix.c:64: qemu_mutex_lock_impl: Assertion `mutex->initialized' failed. This patch add the bitmap_mutex initialize and destroy in COLO lifecycle. Signed-off-by: Zhang Chen <chen.zhang@intel.com> Message-Id: <20190329222951.28945-1-chen.zhang@intel.com> Reviewed-by: Wei Wang <wei.w.wang@intel.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>