Unexpected compiler panic in 2018-05-12 nightly

[jgrillo]

I'm getting a panic thread 'main' panicked at 'miri allocation never successfully created', libcore/option.rs:914:5 while trying to compile an actix project using cargo with rustc version 1.27.0-nightly (ff2ac35db 2018-05-12).

This is the invocation with a backtrace and cargo's failure message:

[jgrillo@localhost wordcountrs]$ RUST_BACKTRACE=1 cargo build --release
   Compiling h2 v0.1.6
   Compiling trust-dns-proto v0.3.3
   Compiling tokio-signal v0.1.5
   Compiling actix v0.5.6
   Compiling cookie v0.10.1
thread 'main' panicked at 'miri allocation never successfully created', libcore/option.rs:914:5
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::print
             at libstd/sys_common/backtrace.rs:71
             at libstd/sys_common/backtrace.rs:59
   2: std::panicking::default_hook::{{closure}}
             at libstd/panicking.rs:211
   3: std::panicking::default_hook
             at libstd/panicking.rs:227
   4: rustc::util::common::panic_hook
   5: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:467
   6: std::panicking::begin_panic_fmt
             at libstd/panicking.rs:350
   7: rust_begin_unwind
             at libstd/panicking.rs:328
   8: core::panicking::panic_fmt
             at libcore/panicking.rs:71
   9: core::option::expect_failed
             at libcore/option.rs:914
  10: rustc_mir::interpret::const_eval::value_to_const_value
  11: rustc_mir::interpret::const_eval::const_val_field
  12: rustc_mir::hair::pattern::PatternContext::const_to_pat::{{closure}}
  13: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter
  14: rustc_mir::hair::pattern::PatternContext::const_to_pat
  15: rustc_mir::hair::pattern::PatternContext::lower_path
  16: rustc_mir::hair::pattern::PatternContext::lower_pattern
  17: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &'a mut F>::call_once
  18: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter
  19: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter
  20: <rustc_mir::hair::pattern::check_match::MatchVisitor<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_expr
  21: rustc::hir::intravisit::walk_expr
  22: <rustc_mir::hair::pattern::check_match::MatchVisitor<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_expr
  23: <rustc_mir::hair::pattern::check_match::MatchVisitor<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_expr
  24: <rustc_mir::hair::pattern::check_match::MatchVisitor<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_body
  25: rustc::session::Session::track_errors
  26: rustc_mir::hair::pattern::check_match::check_match
  27: rustc::dep_graph::graph::DepGraph::with_task_impl
  28: rustc::ty::context::tls::with_related_context
  29: rustc::ty::maps::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::force_query_with_job
  30: rustc::ty::maps::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
  31: rustc::hir::intravisit::Visitor::visit_nested_body
  32: rustc::hir::Crate::visit_all_item_likes
  33: rustc_mir::hair::pattern::check_match::check_crate
  34: rustc::util::common::time
  35: rustc::ty::context::tls::enter_context
  36: <std::thread::local::LocalKey<T>>::with
  37: rustc::ty::context::TyCtxt::create_and_enter
  38: rustc_driver::driver::compile_input
  39: rustc_driver::run_compiler_impl
  40: <scoped_tls::ScopedKey<T>>::set
  41: syntax::with_globals
  42: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
  43: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:105
  44: rustc_driver::run
  45: rustc_driver::main
  46: std::rt::lang_start::{{closure}}
  47: std::panicking::try::do_call
             at libstd/rt.rs:59
             at libstd/panicking.rs:310
  48: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:105
  49: std::rt::lang_start_internal
             at libstd/panicking.rs:289
             at libstd/panic.rs:374
             at libstd/rt.rs:58
  50: main
  51: __libc_start_main
  52: <unknown>
query stack during panic:
#0 [check_match] processing `hpack::table::index_static`
end of query stack

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.27.0-nightly (ff2ac35db 2018-05-12) running on x86_64-unknown-linux-gnu

note: compiler flags: -C opt-level=3 --crate-type lib

note: some of the compiler flags provided by cargo are hidden

error: Could not compile `h2`.
warning: build failed, waiting for other jobs to finish...
error: build failed

rustc --version --verbose output:

rustc 1.27.0-nightly (ff2ac35db 2018-05-12)
binary: rustc
commit-hash: ff2ac35db93a80b2de5daa4f280bf1503d62c164
commit-date: 2018-05-12
host: x86_64-unknown-linux-gnu
release: 1.27.0-nightly
LLVM version: 6.0

Please let me know if I can provide any more information. Thanks!

[maccam912]

I just got an identical bug. I'm also using actix-web, had the "miri allocation" message and "could not compile h2". It looks like @jgrillo has this bug report covered, but let me know if I can help out at all too.

[pietroalbini]

Thanks for reporting this! This is indeed a regression from stable to nightly, and it happens when trying to compile the h2 crate.

A bisect points at #50249 as the cause of the regression. cc @oli-obk @Zoxc

[nikomatsakis]

Possibly fixed. Marking as P-high until we verify.

[lnicola]

Fixed for me in last nightly.

[pietroalbini]

This is fixed on the latest nightly.