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It's still using jemalloc. It has support for Scudo but it hasn't replaced jemalloc as the default allocator. You should carefully qualify statements like this rather than presenting it as if they've fully moved over to using Scudo which they definitely aren't doing in Android Q.
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Oh, okay. Thanks for clarification and my apologies , I should write it more clearly. Actually, I am unaware of default allocator and read it on the google's blog. "Introduction of Scudo hardened allocator...". So, I thought they are using it. security.googleblog.com/2019/05/queue-
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The default allocator for Android Q is still jemalloc. Using Scudo requires enabling it for one of the OS modules in the build configuration and it's not used for the vast majority of the OS or for any apps. It's a separate library that gets loaded as a special case.