Rust doesn't promise that your safe Rust doesn't have
race conditions only specifically that it doesn't have the one very weird kind of race condition from computers with no analogue to the real world, a Data Race.
An ordinary race condition would be e.g. you put the cat out of the front door, then you walk to the kitchen and close that door - well, the cat might race around the outside of the house and get in first. Our world has race conditions, Rust doesn't solve them, take appropriate care.
A data race is much stranger, it's caused by a difference between how humans think about programming ("Sequential consistency" ie time's arrow X causes Y, therefore Y happens after X) and how the machine works (a modern multi-core computer does not exhibit this consistency) maybe you and your house mate both pick up the cat and she tries to put it out the kitchen door, you try to put it out the front door, this seems to work fine mostly but then on Tuesday the cat explodes, everything is covered in cat fur, messy. Rust actually has a whole layer of extra stuff beyond the aliasing-XOR-mutability to prevent this mistake because humans struggle to reason properly about software which loses sequential consistency so it almost doesn't matter what it "means" if this is lost.
An ordinary race condition would be e.g. you put the cat out of the front door, then you walk to the kitchen and close that door - well, the cat might race around the outside of the house and get in first. Our world has race conditions, Rust doesn't solve them, take appropriate care.
A data race is much stranger, it's caused by a difference between how humans think about programming ("Sequential consistency" ie time's arrow X causes Y, therefore Y happens after X) and how the machine works (a modern multi-core computer does not exhibit this consistency) maybe you and your house mate both pick up the cat and she tries to put it out the kitchen door, you try to put it out the front door, this seems to work fine mostly but then on Tuesday the cat explodes, everything is covered in cat fur, messy. Rust actually has a whole layer of extra stuff beyond the aliasing-XOR-mutability to prevent this mistake because humans struggle to reason properly about software which loses sequential consistency so it almost doesn't matter what it "means" if this is lost.