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veera-sivarajan avatar veera-sivarajan commented on July 21, 2024

@rustbot label -needs-triage +T-compiler +A-panic

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bjorn3 avatar bjorn3 commented on July 21, 2024

Changing

rust/library/std/src/alloc.rs

Line 354 in a07f3eb

panic!("memory allocation of {} bytes failed", layout.size());
to no longer include the allocation size should fix the double panic assuming, but that would be a usability regression. On nightly you could set your own alloc error hook which panics with a constant string yourself though. If you pass any extra argument to panic!() besides the format string itself, it will have to allocate a String to set as payload for the panic info passed to the panic hook. This is unavoidable. Even if you use a separate payload type for allocation errors (as #112331 will do), this still has to be put in a Box when you start unwinding.

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the8472 avatar the8472 commented on July 21, 2024

If we had allocator hierarchies then the panic boxing could use an emergency allocator that is a child of the global allocator but keeps a reserve.

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