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I've observed segfaults while using moka with rayon, and the backtrace looks like this:
https://github.com/polachok/moka-crossbeam-bug - code to reproduce.
I see this happening both on macOS/arm64 & linux/amd64.
#8 0x0000555555599ca4 in crossbeam_epoch::internal::Local::flush (self=0x7fffe8001300, guard=0x7ffff7969fc0) at src/internal.rs:376 #9 crossbeam_epoch::guard::Guard::flush (self=0x7ffff7969fc0) at src/guard.rs:294 #10 0x000055555556a29d in moka::sync_base::base_cache::BaseCache<u64, u64, std::hash::random::RandomState>::do_post_update_steps<u64, u64, std::hash::random::RandomState> ( self=<optimized out>, ts=..., key=..., old_info=..., upd_op=...) at /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/moka-0.12.10/src/sync_base/base_cache.rs:601
CC: @polachok
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