1.48.0: Throw "SIGSEGV: invalid memory reference" when building in RustyHermit.

[stlankes]

Building libhermit-rs with the latest nightly compiler failed with a SIGSEV and the error message "invalid memory reference". My local version based on PR #75843 works fine on my system.

You see the problem also at Travis CI, where I test our unikernel on top of our hypervisor. Do you have any idea, why the compiler crashes?

Meta

rustc --version --verbose:

rustc 1.48.0-nightly (d006f5734 2020-08-28)
binary: rustc
commit-hash: d006f5734f49625c34d6fc33bf6b9967243abca8
commit-date: 2020-08-28
host: x86_64-unknown-linux-gnu
release: 1.48.0-nightly
LLVM version: 11.0

Error output

$ cargo build -Z build-std=core,alloc --target aarch64-unknown-hermit
   Compiling compiler_builtins v0.1.32
   Compiling autocfg v1.0.0
   Compiling core v0.0.0 (/home/stefan/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
   Compiling proc-macro2 v1.0.18
   Compiling unicode-xid v0.2.1
   Compiling syn v1.0.33
   Compiling log v0.4.8
   Compiling bitflags v1.2.1
   Compiling rusty-hermit v0.3.35 (/media/psf/share/rusty-hermit/libhermit-rs)
   Compiling num-traits v0.2.12
   Compiling num-integer v0.1.43
   Compiling num-complex v0.2.4
   Compiling num-iter v0.1.41
   Compiling num-rational v0.2.4
   Compiling quote v1.0.7
   Compiling rustc-std-workspace-core v1.99.0 (/home/stefan/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
   Compiling num-derive v0.3.0
   Compiling alloc v0.0.0 (/home/stefan/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc)
   Compiling tock-registers v0.5.0
   Compiling cfg-if v0.1.10
   Compiling register v0.5.1
   Compiling cortex-a v3.0.4
   Compiling aarch64 v0.0.4
   Compiling num v0.2.1
error: could not compile `rusty-hermit`.

Caused by:
  process didn't exit successfully: `rustc --crate-name hermit --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type staticlib --emit=dep-info,link -C opt-level=1 -C panic=abort -Cembed-bitcode=no -C debuginfo=2 -C debug-assertions=on --cfg 'feature="acpi"' --cfg 'feature="default"' --cfg 'feature="pci"' -C metadata=c27a90bd0f04b7fc -C extra-filename=-c27a90bd0f04b7fc --out-dir /media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/deps --target x86_64-unknown-hermit -C incremental=/media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/incremental -L dependency=/media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/deps -L dependency=/media/psf/share/rusty-hermit/libhermit-rs/target/debug/deps --extern 'noprelude:alloc=/media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/deps/liballoc-088de7c3bb083ba8.rlib' --extern bitflags=/media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/deps/libbitflags-43f19e4d7e744c15.rlib --extern 'noprelude:compiler_builtins=/media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/deps/libcompiler_builtins-83f1a51d3731bb3a.rlib' --extern 'noprelude:core=/media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/deps/libcore-d34760a4840521b2.rlib' --extern log=/media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/deps/liblog-1eca26a613db65fe.rlib --extern multiboot=/media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/deps/libmultiboot-17b589e37b816fc9.rlib --extern num=/media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/deps/libnum-a39d8175e004d367.rlib --extern num_derive=/media/psf/share/rusty-hermit/libhermit-rs/target/debug/deps/libnum_derive-030eb7efc88f88d8.so --extern num_traits=/media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/deps/libnum_traits-f5f3931c68156921.rlib --extern x86=/media/psf/share/rusty-hermit/libhermit-rs/target/x86_64-unknown-hermit/debug/deps/libx86-7666fd3514357218.rlib -Z unstable-options` (signal: 11, SIGSEGV: invalid memory reference)

[stlankes]

Maybe this issue is related to #75922

[stlankes]

Close this issue because we remove all naked function to avoid this problem. See hermit-os/kernel#95 for more details.