metal-rs examples fail with SIGILL on recent nightlies, still works on stable

[alexbool]

Running examples (from HEAD of this repository) fails:

alexbool@alexbool-osx ~/D/I/metal-rs> cargo run --example compute
    Finished dev [unoptimized + debuginfo] target(s) in 0.0 secs
     Running `target/debug/examples/compute`
fatal runtime error: allocator memory exhausted
fish: 'cargo run --example compute' terminated by signal SIGILL (Illegal instruction)

alexbool@alexbool-osx ~/D/I/metal-rs> rust-lldb -- target/debug/examples/compute
(lldb) command source -s 0 '/tmp/rust-lldb-commands.9JfQTt'
Executing commands in '/tmp/rust-lldb-commands.9JfQTt'.
(lldb) command script import "/Users/alexbool/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py"
(lldb) type summary add --no-value --python-function lldb_rust_formatters.print_val -x ".*" --category Rust
(lldb) type category enable Rust
(lldb) target create "target/debug/examples/compute"
Current executable set to 'target/debug/examples/compute' (x86_64).
(lldb) r
Process 4860 launched: '/Users/alexbool/Documents/IdeaProjects/metal-rs/target/debug/examples/compute' (x86_64)
fatal runtime error: allocator memory exhausted
compute was compiled with optimization - stepping may behave oddly; variables may not be available.
Process 4860 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
    frame #0: 0x000000010004e6fa compute`alloc_system::platform::_$LT$impl$u20$core..heap..Alloc$u20$for$u20$$RF$$u27$a$u20$alloc_system..System$GT$::oom::haae5aa67e0537221 at lib.rs:215 [opt]
Target 0: (compute) stopped.
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
  * frame #0: 0x000000010004e6fa compute`alloc_system::platform::_$LT$impl$u20$core..heap..Alloc$u20$for$u20$$RF$$u27$a$u20$alloc_system..System$GT$::oom::haae5aa67e0537221 at lib.rs:215 [opt]
    frame #1: 0x000000010004e698 compute`_$LT$alloc_system..System$u20$as$u20$core..heap..Alloc$GT$::oom::h6b14a7ed86d10e67 at lib.rs:78 [opt]
    frame #2: 0x000000010002800c compute`__rde_oom at lib.rs:124 [opt]
    frame #3: 0x000000010001aff9 compute`_$LT$alloc..heap..Heap$u20$as$u20$core..heap..Alloc$GT$::oom::h6fe185a73e220d75 at heap.rs:98 [opt]
    frame #4: 0x000000010001ae83 compute`_$LT$alloc..raw_vec..RawVec$LT$T$C$$u20$A$GT$$GT$::reserve::h31aa44fa05bc4469 at raw_vec.rs:558 [opt]
    frame #5: 0x000000010001582f compute`_$LT$core..fmt..Write..write_fmt..Adapter$LT$$u27$a$C$$u20$T$GT$$u20$as$u20$core..fmt..Write$GT$::write_str::h5b108bba9b49131a [inlined] _$LT$alloc..vec..Vec$LT$T$GT$$GT$::reserve::h68934e9fd0fc8180 at vec.rs:465 [opt]
    frame #6: 0x0000000100015823 compute`_$LT$core..fmt..Write..write_fmt..Adapter$LT$$u27$a$C$$u20$T$GT$$u20$as$u20$core..fmt..Write$GT$::write_str::h5b108bba9b49131a [inlined] _$LT$alloc..vec..Vec$LT$T$GT$$u20$as$u20$alloc..vec..SpecExtend$LT$$RF$$u27$a$u20$T$C$$u20$core..slice..Iter$LT$$u27$a$C$$u20$T$GT$$GT$$GT$::spec_extend::h126e6b75cdf416ca at vec.rs:1859 [opt]
    frame #7: 0x0000000100015823 compute`_$LT$core..fmt..Write..write_fmt..Adapter$LT$$u27$a$C$$u20$T$GT$$u20$as$u20$core..fmt..Write$GT$::write_str::h5b108bba9b49131a [inlined] _$LT$alloc..vec..Vec$LT$T$GT$$GT$::extend_from_slice::h7fec1563e64426ee at vec.rs:1346 [opt]
    frame #8: 0x0000000100015823 compute`_$LT$core..fmt..Write..write_fmt..Adapter$LT$$u27$a$C$$u20$T$GT$$u20$as$u20$core..fmt..Write$GT$::write_str::h5b108bba9b49131a [inlined] alloc::string::String::push_str::hd3e5f3c347641c54 at string.rs:805 [opt]
    frame #9: 0x0000000100015823 compute`_$LT$core..fmt..Write..write_fmt..Adapter$LT$$u27$a$C$$u20$T$GT$$u20$as$u20$core..fmt..Write$GT$::write_str::h5b108bba9b49131a [inlined] _$LT$alloc..string..String$u20$as$u20$core..fmt..Write$GT$::write_str::h3fb28a11f607cf9d at string.rs:2277 [opt]
    frame #10: 0x0000000100015823 compute`_$LT$core..fmt..Write..write_fmt..Adapter$LT$$u27$a$C$$u20$T$GT$$u20$as$u20$core..fmt..Write$GT$::write_str::h5b108bba9b49131a at mod.rs:214 [opt]
    frame #11: 0x000000010000e172 compute`_$LT$alloc..string..String$u20$as$u20$core..fmt..Display$GT$::fmt::hc867ffd54fb6e644(self=&0x7ffeefbff0f0, f=&0x7ffeefbfef78) at string.rs:1860
    frame #12: 0x000000010000e798 compute`_$LT$objc..message..MessageError$u20$as$u20$core..fmt..Display$GT$::fmt::hdca7e778728ba39e(self=&0x7ffeefbff0f0, f=&0x7ffeefbfef78) at mod.rs:157
    frame #13: 0x0000000100051999 compute`core::fmt::write::hd6c4ef3dd62ed92b [inlined] core::fmt::Formatter::run::h1e9c4a7161cf2c85 at mod.rs:1100 [opt]
    frame #14: 0x0000000100051814 compute`core::fmt::write::hd6c4ef3dd62ed92b at mod.rs:1047 [opt]
    frame #15: 0x0000000100016dc4 compute`std::panicking::begin_panic_fmt::hccd237cdae61db17 [inlined] core::fmt::Write::write_fmt::h1f0dbd48320f1e1a at mod.rs:226 [opt]
    frame #16: 0x0000000100016d89 compute`std::panicking::begin_panic_fmt::hccd237cdae61db17 at panicking.rs:348 [opt]
    frame #17: 0x0000000100008211 compute`metal_rs::encoder::CommandEncoderRef::end_encoding::h7ba072b0c0038804(self=&0x100211440) at encoder.rs:135
    frame #18: 0x000000010000581b compute`compute::main::h3c95dc9e471369d8 at main.rs:78
    frame #19: 0x0000000100002e22 compute`std::rt::lang_start::_$u7b$$u7b$closure$u7d$$u7d$::h07c3d44bb113f1a4 at rt.rs:74
    frame #20: 0x0000000100016d08 compute`std::panicking::try::do_call::h7faedbe63ef0ecf9 [inlined] std::rt::lang_start_internal::_$u7b$$u7b$closure$u7d$$u7d$::h73acc47e0a9ff971 at rt.rs:59 [opt]
    frame #21: 0x0000000100016cfc compute`std::panicking::try::do_call::h7faedbe63ef0ecf9 at panicking.rs:306 [opt]
    frame #22: 0x0000000100027b4f compute`__rust_maybe_catch_panic at lib.rs:102 [opt]
    frame #23: 0x0000000100014cf8 compute`std::rt::lang_start_internal::hbde0134cdd993de4 [inlined] std::panicking::try::h66d036c9b5e0ac3f at panicking.rs:285 [opt]
    frame #24: 0x0000000100014cc5 compute`std::rt::lang_start_internal::hbde0134cdd993de4 [inlined] std::panic::catch_unwind::hdc6db1d58a689477 at panic.rs:361 [opt]
    frame #25: 0x0000000100014cc5 compute`std::rt::lang_start_internal::hbde0134cdd993de4 at rt.rs:58 [opt]
    frame #26: 0x0000000100002e02 compute`std::rt::lang_start::he2ae847addd0cd4a(main=&0x100005050, argc=1, argv=&0x7ffeefbff8a0) at rt.rs:74
    frame #27: 0x0000000100005d25 compute`main + 37
    frame #28: 0x00007fff6fd39115 libdyld.dylib`start + 1
(lldb) ^D

alexbool@alexbool-osx ~/D/I/metal-rs> rustc -vV
rustc 1.27.0-nightly (fb44b4c0e 2018-04-04)
binary: rustc
commit-hash: fb44b4c0eb1d344f84f7bb2c90f28e31a8a180be
commit-date: 2018-04-04
host: x86_64-apple-darwin
release: 1.27.0-nightly
LLVM version: 6.0

Still works on stable (1.25.0). I think this is rust issue, but cannot figure it out.

[alecmocatta]

My similar backtrace from vulkano-examples triangle example:

0   triangle                      	0x00000001009ec7da alloc_system::platform::_$LT$impl$u20$alloc..allocator..Alloc$u20$for$u20$$RF$$u27$a$u20$alloc_system..System$GT$::oom::h7ba03423480c6435 + 90 (lib.rs:210)
1   triangle                      	0x00000001009ec778 _$LT$alloc_system..System$u20$as$u20$alloc..allocator..Alloc$GT$::oom::h1cf7c566a518ba1a + 40 (lib.rs:81)
2   triangle                      	0x00000001009c535c __rde_oom + 44 (lib.rs:126)
3   triangle                      	0x00000001009b80d9 _$LT$alloc..heap..Heap$u20$as$u20$alloc..allocator..Alloc$GT$::oom::h3685bc2cb5516d9c + 9 (heap.rs:98)
4   triangle                      	0x00000001009b80c3 _$LT$alloc..raw_vec..RawVec$LT$T$C$$u20$A$GT$$GT$::reserve::h9f053b2c575fd046 + 339 (raw_vec.rs:557)
5   triangle                      	0x00000001009b155f _$LT$core..fmt..Write..write_fmt..Adapter$LT$$u27$a$C$$u20$T$GT$$u20$as$u20$core..fmt..Write$GT$::write_str::h1d32baed33c7429b + 31 (mod.rs:214)
6   triangle                      	0x00000001008f94c2 _$LT$alloc..string..String$u20$as$u20$core..fmt..Display$GT$::fmt::h8e8ee9dc63e63bfb + 50 (string.rs:1836)
7   triangle                      	0x00000001008fcfd8 _$LT$objc..message..MessageError$u20$as$u20$core..fmt..Display$GT$::fmt::hc4da75ee8325b1eb + 40 (mod.rs:157)
8   triangle                      	0x00000001009f29c9 core::fmt::write::hef443c0bb15170fe + 601 (mod.rs:1035)
9   triangle                      	0x00000001009b2234 std::panicking::begin_panic_fmt::hc0d47fefde30b0eb + 116 (panicking.rs:349)
10  triangle                      	0x00000001008c77fd metal_rs::CoreAnimationLayerRef::set_presents_with_transaction::hbaf562b3f4356cce + 509 (lib.rs:306)

It seems the objc send is failing, returning an undefined MessageError which on display in the panic!() tries to allocate a huge vec. My guess it it's due to https://github.com/SSheldon/rust-objc/issues/62.