rustdoc error: thread 'rustc' has overflowed its stack

[xMAC94x]

Code

I tried to find a minimal reproduceable error, but i was not successful.
The error happens when using rustdoc on veloren.
Repo: https://gitlab.com/veloren/veloren.git
commit: sharp/lod-history~65 with id db1401a6910bf42dcf502462c90038752ff5fbdb

RUST_BACKTRACE=1 cargo doc --no-deps -v

Additional Info:

This commit is a Merge commit. It's parents are both 69e508d8c94d8973033817ca86f357e466fc7c4d and e8b4b29d708cd86bb960aa2f94f497ecb63332a7. Interestingly the error does NOT occur on any of its parents. So only the combination or conflict resolution seems to cause this bug!

We have a Cargo.lock file and a rust-toolchain flag, which should make reproducing this exact problem easy

Meta

rustc --version --verbose:
WARNING! WE ARE USING A RUST-TOOLCHAIN FILE WITH VERSION nightly-2020-06-22 But it still exists in newer

nightlies
rustc 1.46.0-nightly (a8cf39911 2020-06-21)
binary: rustc
commit-hash: a8cf3991177f30694200002cd9479ffbbe6d9a1a
commit-date: 2020-06-21
host: x86_64-unknown-linux-gnu
release: 1.46.0-nightly
LLVM version: 10.0

Error output

 RUST_BACKTRACE=1 cargo doc --no-deps -v
       Fresh autocfg v1.0.0
       Fresh lazy_static v1.4.0
       Fresh pkg-config v0.3.17
       Fresh unicode-xid v0.2.0
... copied out for readability...
       Fresh veloren-common v0.6.0 (/mnt/nfs/marcel/Entw/Rust/veloren/common)
       Fresh conrod_core v0.63.0 (https://gitlab.com/veloren/conrod.git?branch=pre-winit-20#46b374ed)
       Fresh gfx_window_glutin v0.31.0
       Fresh veloren-world v0.6.0 (/mnt/nfs/marcel/Entw/Rust/veloren/world)
       Fresh veloren-voxygen-anim v0.6.0 (/mnt/nfs/marcel/Entw/Rust/veloren/voxygen/src/anim)
       Fresh veloren-client v0.6.0 (/mnt/nfs/marcel/Entw/Rust/veloren/client)
       Fresh veloren-server v0.6.0 (/mnt/nfs/marcel/Entw/Rust/veloren/server)
warning: `[2]` cannot be resolved, ignoring it.
  --> world/src/sim/util.rs:43:51
   |
43 | /// Fortunately, it also provides a reference to [2], which contains a complete
   |                                                   ^ cannot be resolved, ignoring
   |
   = note: `#[warn(intra_doc_link_resolution_failure)]` on by default
   = help: to escape `[` and `]` characters, just add '\' before them like `\[` or `\]`

warning: `[2]` cannot be resolved, ignoring it.
  --> world/src/sim/util.rs:43:51
   |
43 | /// Fortunately, it also provides a reference to [2], which contains a complete
   |                                                   ^ cannot be resolved, ignoring
   |
   = help: to escape `[` and `]` characters, just add '\' before them like `\[` or `\]`

warning: 2 warnings emitted

       Fresh veloren-chat-cli v0.6.0 (/mnt/nfs/marcel/Entw/Rust/veloren/chat-cli)
 Documenting veloren-voxygen v0.6.0 (/mnt/nfs/marcel/Entw/Rust/veloren/voxygen)
       Fresh veloren-server-cli v0.6.0 (/mnt/nfs/marcel/Entw/Rust/veloren/server-cli)
     Running `rustdoc --edition=2018 --crate-type lib --crate-name veloren_voxygen voxygen/src/lib.rs -o /mnt/games/cargo-build/doc --cfg 'feature="default"' --cfg 'feature="gfx_device_gl"' --cfg 'feature="gfx_gl"' --cfg 'feature="gl"' --cfg 'feature="msgbox"' --cfg 'feature="server"' --cfg 'feature="singleplayer"' --error-format=json --json=diagnostic-rendered-ansi -L dependency=/mnt/games/cargo-build/debug/deps --extern authc=/mnt/games/cargo-build/debug/deps/libauthc-46936fd379753160.rmeta --extern backtrace=/mnt/games/cargo-build/debug/deps/libbacktrace-4462789312426ee7.rmeta --extern bincode=/mnt/games/cargo-build/debug/deps/libbincode-fb144a1867b6489b.rmeta --extern chrono=/mnt/games/cargo-build/debug/deps/libchrono-3ed76bc2a88828cb.rmeta --extern conrod_core=/mnt/games/cargo-build/debug/deps/libconrod_core-1544aa2f023fcc3d.rmeta --extern conrod_winit=/mnt/games/cargo-build/debug/deps/libconrod_winit-a2c74a96eeff499e.rmeta --extern cpal=/mnt/games/cargo-build/debug/deps/libcpal-080861d3b47a4285.rmeta --extern crossbeam=/mnt/games/cargo-build/debug/deps/libcrossbeam-42646d02569cc310.rmeta --extern deunicode=/mnt/games/cargo-build/debug/deps/libdeunicode-e9876102b6e6d18c.rmeta --extern directories_next=/mnt/games/cargo-build/debug/deps/libdirectories_next-fd9ee68f4e6aef3b.rmeta --extern dot_vox=/mnt/games/cargo-build/debug/deps/libdot_vox-907ad18e397b2668.rmeta --extern euc=/mnt/games/cargo-build/debug/deps/libeuc-3163cdbb4baf6086.rmeta --extern failure=/mnt/games/cargo-build/debug/deps/libfailure-7bff757bff76eb23.rmeta --extern gfx=/mnt/games/cargo-build/debug/deps/libgfx-5ebc1e919bb7b575.rmeta --extern gfx_device_gl=/mnt/games/cargo-build/debug/deps/libgfx_device_gl-d0ef42bca62d5581.rmeta --extern gfx_gl=/mnt/games/cargo-build/debug/deps/libgfx_gl-adcd0216f58d5db4.rmeta --extern gfx_window_glutin=/mnt/games/cargo-build/debug/deps/libgfx_window_glutin-0e5d6b5a413c6859.rmeta --extern gilrs=/mnt/games/cargo-build/debug/deps/libgilrs-daa6337c209976f5.rmeta --extern glsl_include=/mnt/games/cargo-build/debug/deps/libglsl_include-b10dca4079d37137.rmeta --extern glutin=/mnt/games/cargo-build/debug/deps/libglutin-7e274189af9a73cc.rmeta --extern guillotiere=/mnt/games/cargo-build/debug/deps/libguillotiere-61e043d166696cbb.rmeta --extern hashbrown=/mnt/games/cargo-build/debug/deps/libhashbrown-1e6099e24b0a9fb0.rmeta --extern image=/mnt/games/cargo-build/debug/deps/libimage-fb8902848e42baec.rmeta --extern msgbox=/mnt/games/cargo-build/debug/deps/libmsgbox-fa416e3b8033fad1.rmeta --extern num=/mnt/games/cargo-build/debug/deps/libnum-884c9099b75dc327.rmeta --extern rand=/mnt/games/cargo-build/debug/deps/librand-6ad53670c4efadbe.rmeta --extern rodio=/mnt/games/cargo-build/debug/deps/librodio-922a00875f0bc608.rmeta --extern ron=/mnt/games/cargo-build/debug/deps/libron-9e0cf7ac9effd4ec.rmeta --extern serde=/mnt/games/cargo-build/debug/deps/libserde-f52b69f6401e968d.rmeta --extern serde_derive=/mnt/games/cargo-build/debug/deps/libserde_derive-40d7b8f03b487b77.so --extern specs=/mnt/games/cargo-build/debug/deps/libspecs-879ccf6c8189fc4b.rmeta --extern specs_idvs=/mnt/games/cargo-build/debug/deps/libspecs_idvs-1e6be492812cd84b.rmeta --extern tracing=/mnt/games/cargo-build/debug/deps/libtracing-12ced1713b3a8b71.rmeta --extern tracing_appender=/mnt/games/cargo-build/debug/deps/libtracing_appender-910550bb6cba5b0a.rmeta --extern tracing_log=/mnt/games/cargo-build/debug/deps/libtracing_log-7be5f709852e6e19.rmeta --extern tracing_subscriber=/mnt/games/cargo-build/debug/deps/libtracing_subscriber-f13a2d91bfb6c915.rmeta --extern treeculler=/mnt/games/cargo-build/debug/deps/libtreeculler-1ba3f09db61c3c13.rmeta --extern uvth=/mnt/games/cargo-build/debug/deps/libuvth-9864d323e5b260d2.rmeta --extern vek=/mnt/games/cargo-build/debug/deps/libvek-369132c02e7b7137.rmeta --extern client=/mnt/games/cargo-build/debug/deps/libveloren_client-a29663581d45a519.rmeta --extern common=/mnt/games/cargo-build/debug/deps/libveloren_common-087408ccf8d310d5.rmeta --extern server=/mnt/games/cargo-build/debug/deps/libveloren_server-d0dfa4d02f223552.rmeta --extern anim=/mnt/games/cargo-build/debug/deps/libvoxygen_anim-3d29bc87955edf7a.rmeta --extern winit=/mnt/games/cargo-build/debug/deps/libwinit-276166b110b3cebd.rmeta`

thread 'rustc' has overflowed its stack
fatal runtime error: stack overflow
error: Could not document `veloren-voxygen`.

Caused by:
  process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name veloren_voxygen voxygen/src/lib.rs -o /mnt/games/cargo-build/doc --cfg 'feature="default"' --cfg 'feature="gfx_device_gl"' --cfg 'feature="gfx_gl"' --cfg 'feature="gl"' --cfg 'feature="msgbox"' --cfg 'feature="server"' --cfg 'feature="singleplayer"' --error-format=json --json=diagnostic-rendered-ansi -L dependency=/mnt/games/cargo-build/debug/deps --extern authc=/mnt/games/cargo-build/debug/deps/libauthc-46936fd379753160.rmeta --extern backtrace=/mnt/games/cargo-build/debug/deps/libbacktrace-4462789312426ee7.rmeta --extern bincode=/mnt/games/cargo-build/debug/deps/libbincode-fb144a1867b6489b.rmeta --extern chrono=/mnt/games/cargo-build/debug/deps/libchrono-3ed76bc2a88828cb.rmeta --extern conrod_core=/mnt/games/cargo-build/debug/deps/libconrod_core-1544aa2f023fcc3d.rmeta --extern conrod_winit=/mnt/games/cargo-build/debug/deps/libconrod_winit-a2c74a96eeff499e.rmeta --extern cpal=/mnt/games/cargo-build/debug/deps/libcpal-080861d3b47a4285.rmeta --extern crossbeam=/mnt/games/cargo-build/debug/deps/libcrossbeam-42646d02569cc310.rmeta --extern deunicode=/mnt/games/cargo-build/debug/deps/libdeunicode-e9876102b6e6d18c.rmeta --extern directories_next=/mnt/games/cargo-build/debug/deps/libdirectories_next-fd9ee68f4e6aef3b.rmeta --extern dot_vox=/mnt/games/cargo-build/debug/deps/libdot_vox-907ad18e397b2668.rmeta --extern euc=/mnt/games/cargo-build/debug/deps/libeuc-3163cdbb4baf6086.rmeta --extern failure=/mnt/games/cargo-build/debug/deps/libfailure-7bff757bff76eb23.rmeta --extern gfx=/mnt/games/cargo-build/debug/deps/libgfx-5ebc1e919bb7b575.rmeta --extern gfx_device_gl=/mnt/games/cargo-build/debug/deps/libgfx_device_gl-d0ef42bca62d5581.rmeta --extern gfx_gl=/mnt/games/cargo-build/debug/deps/libgfx_gl-adcd0216f58d5db4.rmeta --extern gfx_window_glutin=/mnt/games/cargo-build/debug/deps/libgfx_window_glutin-0e5d6b5a413c6859.rmeta --extern gilrs=/mnt/games/cargo-build/debug/deps/libgilrs-daa6337c209976f5.rmeta --extern glsl_include=/mnt/games/cargo-build/debug/deps/libglsl_include-b10dca4079d37137.rmeta --extern glutin=/mnt/games/cargo-build/debug/deps/libglutin-7e274189af9a73cc.rmeta --extern guillotiere=/mnt/games/cargo-build/debug/deps/libguillotiere-61e043d166696cbb.rmeta --extern hashbrown=/mnt/games/cargo-build/debug/deps/libhashbrown-1e6099e24b0a9fb0.rmeta --extern image=/mnt/games/cargo-build/debug/deps/libimage-fb8902848e42baec.rmeta --extern msgbox=/mnt/games/cargo-build/debug/deps/libmsgbox-fa416e3b8033fad1.rmeta --extern num=/mnt/games/cargo-build/debug/deps/libnum-884c9099b75dc327.rmeta --extern rand=/mnt/games/cargo-build/debug/deps/librand-6ad53670c4efadbe.rmeta --extern rodio=/mnt/games/cargo-build/debug/deps/librodio-922a00875f0bc608.rmeta --extern ron=/mnt/games/cargo-build/debug/deps/libron-9e0cf7ac9effd4ec.rmeta --extern serde=/mnt/games/cargo-build/debug/deps/libserde-f52b69f6401e968d.rmeta --extern serde_derive=/mnt/games/cargo-build/debug/deps/libserde_derive-40d7b8f03b487b77.so --extern specs=/mnt/games/cargo-build/debug/deps/libspecs-879ccf6c8189fc4b.rmeta --extern specs_idvs=/mnt/games/cargo-build/debug/deps/libspecs_idvs-1e6be492812cd84b.rmeta --extern tracing=/mnt/games/cargo-build/debug/deps/libtracing-12ced1713b3a8b71.rmeta --extern tracing_appender=/mnt/games/cargo-build/debug/deps/libtracing_appender-910550bb6cba5b0a.rmeta --extern tracing_log=/mnt/games/cargo-build/debug/deps/libtracing_log-7be5f709852e6e19.rmeta --extern tracing_subscriber=/mnt/games/cargo-build/debug/deps/libtracing_subscriber-f13a2d91bfb6c915.rmeta --extern treeculler=/mnt/games/cargo-build/debug/deps/libtreeculler-1ba3f09db61c3c13.rmeta --extern uvth=/mnt/games/cargo-build/debug/deps/libuvth-9864d323e5b260d2.rmeta --extern vek=/mnt/games/cargo-build/debug/deps/libvek-369132c02e7b7137.rmeta --extern client=/mnt/games/cargo-build/debug/deps/libveloren_client-a29663581d45a519.rmeta --extern common=/mnt/games/cargo-build/debug/deps/libveloren_common-087408ccf8d310d5.rmeta --extern server=/mnt/games/cargo-build/debug/deps/libveloren_server-d0dfa4d02f223552.rmeta --extern anim=/mnt/games/cargo-build/debug/deps/libvoxygen_anim-3d29bc87955edf7a.rmeta --extern winit=/mnt/games/cargo-build/debug/deps/libwinit-276166b110b3cebd.rmeta` (signal: 6, SIGABRT: process abort signal)

Details, copied out from above

       Fresh scopeguard v1.1.0
       Fresh semver-parser v0.7.0
       Fresh unicode-xid v0.1.0
       Fresh once_cell v1.4.0
       Fresh smallvec v1.4.0
       Fresh same-file v1.0.6
       Fresh slab v0.4.2
       Fresh ppv-lite86 v0.2.8
       Fresh spin v0.5.2
       Fresh either v1.5.3
       Fresh percent-encoding v2.1.0
       Fresh version_check v0.9.2
       Fresh untrusted v0.7.1
       Fresh arrayvec v0.5.1
       Fresh void v1.0.2
       Fresh matches v0.1.8
       Fresh version_check v0.1.5
       Fresh ahash v0.3.8
       Fresh proc-macro-hack v0.5.16
       Fresh itoa v0.4.5
       Fresh adler32 v1.0.4
       Fresh base64 v0.12.1
       Fresh arrayref v0.3.6
       Fresh mopa v0.2.2
       Fresh base64 v0.11.0
       Fresh static_assertions v1.1.0
       Fresh nodrop v0.1.14
       Fresh constant_time_eq v0.1.5
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       Fresh tracing-core v0.1.10
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       Fresh wayland-commons v0.23.6
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       Fresh conrod_derive v0.63.0 (https://gitlab.com/veloren/conrod.git?branch=pre-winit-20#46b374ed)
       Fresh guillotiere v0.5.2
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Backtrace

[Switching to Thread 0x7f38cb525640 (LWP 70289)]
0x00007f38d49587bb in alloc::collections::btree::map::Entry<K,V>::or_insert_with ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
(gdb) bt
#0  0x00007f38d49587bb in alloc::collections::btree::map::Entry<K,V>::or_insert_with ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#1  0x00007f38d487d161 in rustc_infer::infer::region_constraints::RegionConstraintCollector::make_subregion ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#2  0x00007f38d487c9a2 in rustc_infer::infer::region_constraints::RegionConstraintCollector::make_eqregion ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#3  0x00007f38d48783f5 in <rustc_infer::infer::equate::Equate as rustc_middle::ty::relate::TypeRelation>::regions ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#4  0x00007f38d48a8ecd in rustc_middle::ty::relate::super_relate_tys ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#5  0x00007f38d4902e7d in rustc_infer::infer::combine::<impl rustc_infer::infer::InferCtxt>::super_combine_tys ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#6  0x00007f38d4878195 in <rustc_infer::infer::equate::Equate as rustc_middle::ty::relate::TypeRelation>::tys ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#7  0x00007f38d46e117b in <rustc_middle::ty::subst::GenericArg as rustc_middle::ty::relate::Relate>::relate ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#8  0x00007f38d471a093 in <I as rustc_middle::ty::context::InternAs<[T],R>>::intern_with ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#9  0x00007f38d46e0918 in <rustc_middle::ty::sty::TraitRef as rustc_middle::ty::relate::Relate>::relate ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#10 0x00007f38d45d93ef in rustc_infer::infer::InferCtxt::commit_if_ok ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#11 0x00007f38d475d4a7 in rustc_trait_selection::traits::select::SelectionContext::match_impl ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#12 0x00007f38d45dc70f in rustc_infer::infer::InferCtxt::probe ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#13 0x00007f38d4662894 in rustc_middle::ty::trait_def::<impl rustc_middle::ty::context::TyCtxt>::for_each_relevant_impl ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#14 0x00007f38d47524cc in rustc_trait_selection::traits::select::candidate_assembly::<impl rustc_trait_selection::traits::select::SelectionContext>::assemble_candidates_from_impls ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#15 0x00007f38d4751861 in rustc_trait_selection::traits::select::candidate_assembly::<impl rustc_trait_selection::traits::select::SelectionContext>::assemble_candidates ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#16 0x00007f38d475a6c6 in rustc_trait_selection::traits::select::SelectionContext::candidate_from_obligation_no_cache ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#17 0x00007f38d463ec8f in rustc_query_system::dep_graph::graph::DepGraph<K>::with_anon_task ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18 0x00007f38d475013a in rustc_trait_selection::traits::select::candidate_assembly::<impl rustc_trait_selection::traits::select::SelectionContext>::candidate_from_obligation ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#19 0x00007f38d475713c in rustc_trait_selection::traits::select::SelectionContext::select ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#20 0x00007f38d45d8d98 in rustc_infer::infer::InferCtxt::commit_if_ok ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#21 0x00007f38d46f052e in rustc_trait_selection::traits::project::opt_normalize_projection_type ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#22 0x00007f38d46ecaa4 in rustc_trait_selection::traits::project::project_and_unify_type ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#23 0x00007f38d45d8270 in rustc_infer::infer::InferCtxt::commit_if_ok ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#24 0x00007f38d4757d13 in rustc_trait_selection::traits::select::SelectionContext::evaluate_predicate_recursively ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#25 0x00007f38d475751d in rustc_trait_selection::traits::select::SelectionContext::evaluate_predicates_recursively ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#26 0x00007f38d45dcd60 in rustc_infer::infer::InferCtxt::probe ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#27 0x00007f38d46fc25b in <core::iter::adapters::ResultShunt<I,E> as core::iter::traits::iterator::Iterator>::next ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#28 0x00007f38d47a5823 in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#29 0x00007f38d475aa25 in rustc_trait_selection::traits::select::SelectionContext::candidate_from_obligation_no_cache ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#30 0x00007f38d463ec8f in rustc_query_system::dep_graph::graph::DepGraph<K>::with_anon_task ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#31 0x00007f38d475013a in rustc_trait_selection::traits::select::candidate_assembly::<impl rustc_trait_selection::traits::select::SelectionContext>::candidate_from_obligation ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#32 0x00007f38d475713c in rustc_trait_selection::traits::select::SelectionContext::select ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#33 0x00007f38d45d8d98 in rustc_infer::infer::InferCtxt::commit_if_ok ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#34 0x00007f38d46f052e in rustc_trait_selection::traits::project::opt_normalize_projection_type ()

...

#18488 0x00007f38d47a5823 in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18489 0x00007f38d475aa25 in rustc_trait_selection::traits::select::SelectionContext::candidate_from_obligation_no_cache ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18490 0x00007f38d463ec8f in rustc_query_system::dep_graph::graph::DepGraph<K>::with_anon_task ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18491 0x00007f38d475013a in rustc_trait_selection::traits::select::candidate_assembly::<impl rustc_trait_selection::traits::select::SelectionContext>::candidate_from_obligation ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18492 0x00007f38d475713c in rustc_trait_selection::traits::select::SelectionContext::select ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18493 0x00007f38d45d8d98 in rustc_infer::infer::InferCtxt::commit_if_ok ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18494 0x00007f38d46f052e in rustc_trait_selection::traits::project::opt_normalize_projection_type ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18495 0x00007f38d46ecaa4 in rustc_trait_selection::traits::project::project_and_unify_type ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18496 0x00007f38d45d8270 in rustc_infer::infer::InferCtxt::commit_if_ok ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18497 0x00007f38d4757d13 in rustc_trait_selection::traits::select::SelectionContext::evaluate_predicate_recursively ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18498 0x00007f38d475751d in rustc_trait_selection::traits::select::SelectionContext::evaluate_predicates_recursively ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18499 0x00007f38d45dcd60 in rustc_infer::infer::InferCtxt::probe ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18500 0x00007f38d46fc25b in <core::iter::adapters::ResultShunt<I,E> as core::iter::traits::iterator::Iterator>::next ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18501 0x00007f38d47a5823 in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18502 0x00007f38d475aa25 in rustc_trait_selection::traits::select::SelectionContext::candidate_from_obligation_no_cache ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18503 0x00007f38d463ec8f in rustc_query_system::dep_graph::graph::DepGraph<K>::with_anon_task ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18504 0x00007f38d475013a in rustc_trait_selection::traits::select::candidate_assembly::<impl rustc_trait_selection::traits::select::SelectionContext>::candidate_from_obligation ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18505 0x00007f38d475713c in rustc_trait_selection::traits::select::SelectionContext::select ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18506 0x00007f38d45d8d98 in rustc_infer::infer::InferCtxt::commit_if_ok ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18507 0x00007f38d46f052e in rustc_trait_selection::traits::project::opt_normalize_projection_type ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18508 0x00007f38d46ecaa4 in rustc_trait_selection::traits::project::project_and_unify_type ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18509 0x00007f38d45d8270 in rustc_infer::infer::InferCtxt::commit_if_ok ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18510 0x00007f38d4757d13 in rustc_trait_selection::traits::select::SelectionContext::evaluate_predicate_recursively ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18511 0x00007f38d475751d in rustc_trait_selection::traits::select::SelectionContext::evaluate_predicates_recursively ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18512 0x00007f38d4757dea in rustc_trait_selection::traits::select::SelectionContext::evaluate_predicate_recursively ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18513 0x00007f38d475751d in rustc_trait_selection::traits::select::SelectionContext::evaluate_predicates_recursively ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18514 0x00007f38d45dcd60 in rustc_infer::infer::InferCtxt::probe ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18515 0x00007f38d4759b9a in rustc_trait_selection::traits::select::SelectionContext::evaluate_stack ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18516 0x00007f38d463a916 in rustc_query_system::dep_graph::graph::DepGraph<K>::with_anon_task ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18517 0x00007f38d4758a32 in rustc_trait_selection::traits::select::SelectionContext::evaluate_predicate_recursively ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18518 0x00007f38d45dd422 in rustc_infer::infer::InferCtxt::probe ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18519 0x00007f38d47573c0 in rustc_trait_selection::traits::select::SelectionContext::evaluate_root_obligation ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18520 0x00007f38d2d58f8f in rustc_middle::ty::context::GlobalCtxt::enter_local ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18521 0x00007f38d2d98266 in rustc_traits::evaluate_obligation::evaluate_obligation ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
--Type <RET> for more, q to quit, c to continue without paging--
#18522 0x00007f38d45e37f6 in rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::evaluate_obligation>::compute () from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18523 0x00007f38d46442f8 in rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18524 0x00007f38d46196f8 in rustc_data_structures::stack::ensure_sufficient_stack ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18525 0x00007f38d46b8f27 in rustc_query_system::query::plumbing::get_query_impl ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18526 0x00007f38d4604709 in <rustc_infer::infer::InferCtxt as rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt>::evaluate_obligation ()
   from /home/marcel/.rustup/toolchains/nightly-2020-06-22-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-5e50657ff02a973e.so
#18527 0x000055b92c45af87 in rustc_middle::ty::context::GlobalCtxt::enter_local ()
#18528 0x000055b92c47d7ac in rustdoc::clean::blanket_impl::BlanketImplFinder::get_blanket_impls::{{closure}} ()
#18529 0x000055b92c45cc3d in rustc_middle::ty::trait_def::<impl rustc_middle::ty::context::TyCtxt>::for_each_relevant_impl ()
#18530 0x000055b92c3d6895 in rustdoc::clean::blanket_impl::BlanketImplFinder::get_blanket_impls ()
#18531 0x000055b92c332829 in rustdoc::clean::utils::get_auto_trait_and_blanket_impls ()
#18532 0x000055b92c345b75 in <rustdoc::passes::collect_trait_impls::SyntheticImplCollector as rustdoc::fold::DocFolder>::fold_item ()
#18533 0x000055b92c4f9044 in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter ()
#18534 0x000055b92c34243e in rustdoc::fold::DocFolder::fold_inner_recur ()
#18535 0x000055b92c34583d in <rustdoc::passes::collect_trait_impls::SyntheticImplCollector as rustdoc::fold::DocFolder>::fold_item ()
#18536 0x000055b92c4f9044 in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter ()
#18537 0x000055b92c34243e in rustdoc::fold::DocFolder::fold_inner_recur ()
#18538 0x000055b92c34583d in <rustdoc::passes::collect_trait_impls::SyntheticImplCollector as rustdoc::fold::DocFolder>::fold_item ()
#18539 0x000055b92c4f9044 in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter ()
#18540 0x000055b92c34243e in rustdoc::fold::DocFolder::fold_inner_recur ()
#18541 0x000055b92c34583d in <rustdoc::passes::collect_trait_impls::SyntheticImplCollector as rustdoc::fold::DocFolder>::fold_item ()
#18542 0x000055b92c4f9044 in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter ()
#18543 0x000055b92c34243e in rustdoc::fold::DocFolder::fold_inner_recur ()
#18544 0x000055b92c34583d in <rustdoc::passes::collect_trait_impls::SyntheticImplCollector as rustdoc::fold::DocFolder>::fold_item ()
#18545 0x000055b92c34340d in rustdoc::passes::collect_trait_impls::collect_trait_impls ()
#18546 0x000055b92c30c7eb in rustc_middle::ty::context::tls::enter_global ()
#18547 0x000055b92c2d3906 in rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter ()
#18548 0x000055b92c21b331 in rustc_span::with_source_map ()
#18549 0x000055b92c2d42a8 in rustc_interface::interface::run_compiler_in_existing_thread_pool ()
#18550 0x000055b92c455813 in <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once ()
#18551 0x000055b92c3c8ca2 in rustc_driver::catch_fatal_errors ()
#18552 0x000055b92c253096 in rustdoc::main_options ()
#18553 0x000055b92c2ba777 in scoped_tls::ScopedKey<T>::set ()
#18554 0x000055b92c23c582 in rustc_ast::attr::with_globals ()
#18555 0x000055b92c2d4b60 in std::sys_common::backtrace::__rust_begin_short_backtrace ()
#18556 0x000055b92c3cd90e in core::ops::function::FnOnce::call_once{{vtable-shim}} ()



#18557 0x00007f38d1edb69a in <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once () at /rustc/a8cf3991177f30694200002cd9479ffbbe6d9a1a/src/liballoc/boxed.rs:1076
#18558 <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once () at /rustc/a8cf3991177f30694200002cd9479ffbbe6d9a1a/src/liballoc/boxed.rs:1076
#18559 std::sys::unix::thread::Thread::new::thread_start () at src/libstd/sys/unix/thread.rs:87
#18560 0x00007f38d1e093e9 in start_thread () from /usr/lib/libpthread.so.0
#18561 0x00007f38d1d1b293 in clone () from /usr/lib/libc.so.6

[jyn514]

I can't build your project. Is there anyway you could narrow this down even a little? Dependencies are fine as long as I can reproduce.

$ cargo +nightly build
error: failed to read `/home/joshua/src/rust/veloren/common/Cargo.toml`

Caused by:
  No such file or directory (os error 2)
$ git checkout sharp/lod-history -f
git-lfs filter-process: 1: git-lfs: not found
fatal: the remote end hung up unexpectedly

[jyn514]

Alternatively if you could get a backtrace with gdb, that would also be helpful.

[xMAC94x]

@jyn514 have you installed git-lfs on your machine ?
apt install git-lfs on an ubuntu machine
with that you should be able to get the right commit.
Note, no +nightly is necessary as it should automatically use the toolchain one. (expect ofc you wanted to overwrite this)

git clone https://gitlab.com/veloren/veloren.git
git fetch --all --tags
git checkout "sharp/lod-history~65"
#or 
git checkout db1401a6910bf42dcf502462c90038752ff5fbdb
cargo build

gdb is a good tipp, i will try later today when i am back from work :)

[xMAC94x]

@jyn514 hi, i added a backtrace to the first post of this issue from gdb :)

[jyn514]

I managed to reproduce:

git clone https://gitlab.com/veloren/veloren && cd veloren
git checkout -f db1401a6910bf42dcf502462c90038752ff5fbdb
sudo apt install git-lfs libasound2-dev libudev-dev
cd voxygen/
cargo doc --no-deps --no-default-features --features=singleplayer,gl

[jyn514]

veloren not compiling on latest nightly makes this really hard to debug.

[jyn514]

Note that this still occurs on the veloran master branch, so no need to check out that exact commit.

[Imberflur]

on the latest nightly it compiles for me and reproduces with the singleplayer feature off

cd voxygen
cargo doc --no-deps --no-default-features --features=gl

[Imberflur]

simplified to

// lib.rs
#![recursion_limit = "2048"]
pub use vek::vec::repr_c:Vec2;

[dependencies]
# present with all later releases of vek (older releases no longer compile due to borrow checker fixes)
vek = "=0.9.8"

[jyn514]

Oh that's interesting, it compiles fine without the recursion limit but crashes with it. I wonder why it doesn't give an error without.