ICE with out-of-memory

[huonw]

Trying to build rust from incoming with insufficient RAM gives me (I'm pretty sure that is the problem, killing some programs got it to compile without any code changes)

$ RUST_LOG=::rt::backtrace make 
cfg: build triple x86_64-unknown-linux-gnu
cfg: host triples x86_64-unknown-linux-gnu
cfg: target triples x86_64-unknown-linux-gnu
cfg: host for x86_64-unknown-linux-gnu is x86_64
cfg: os for x86_64-unknown-linux-gnu is unknown-linux-gnu
cfg: using gcc
cfg: no llnextgen found, omitting grammar-verification
compile_and_link: x86_64-unknown-linux-gnu/stage0/lib/rustc/x86_64-unknown-linux-gnu/lib/librustc.so
rust: task failed at 'explicit failure', /home/rustbuild/src/rust-buildbot/slave/snap3-linux/build/src/libcore/run.rs:343
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustrt.so(_ZN9rust_task13begin_failureEPKcS1_m+0x4f)[0x2b56c7b9652f]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustrt.so(+0x299f1)[0x2b56c7ba69f1]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustrt.so(upcall_fail+0x1c6)[0x2b56c7b98cb6]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/libcore-c3ca5d77d81b46c1-0.6.so(+0x1059ab)[0x2b56c488d9ab]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/libcore-c3ca5d77d81b46c1-0.6.so(+0x105952)[0x2b56c488d952]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/libcore-c3ca5d77d81b46c1-0.6.so(_ZN3sys12begin_unwind16_701b8ec61f97ead3_06E+0x71)[0x2b56c47d5441]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/libcore-c3ca5d77d81b46c1-0.6.so(_ZN3run14program_output16_3596fc6920d4f353_06E+0x2872)[0x2b56c4887aa2]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/libcore-c3ca5d77d81b46c1-0.6.so(+0x14e214)[0x2b56c48d6214]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(_ZN4back4link11link_binary17_483345abdae712883_06E+0x3a9d)[0x2b56c5f65bad]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(+0x5db835)[0x2b56c5d2e835]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(_ZN6driver6driver12compile_rest16_87c0f340aa21a393_06E+0x40e2)[0x2b56c5fcc2b2]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(+0x8b9e84)[0x2b56c600ce84]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(_ZN6driver6driver12compile_upto17_84743710faafb0af3_06E+0x108)[0x2b56c5fce738]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(+0x8b9e84)[0x2b56c600ce84]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(_ZN6driver6driver13compile_input15_a6b0fe22676e6b3_06E+0xca)[0x2b56c5fceb7a]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(_ZN12run_compiler16_9de519bbeb758373_06E+0x20aa)[0x2b56c5ffe31a]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(+0x8b7951)[0x2b56c600a951]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(+0x8b417c)[0x2b56c600717c]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(+0x8b9e84)[0x2b56c600ce84]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/libcore-c3ca5d77d81b46c1-0.6.so(+0xce38e)[0x2b56c485638e]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/libcore-c3ca5d77d81b46c1-0.6.so(+0x14e214)[0x2b56c48d6214]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustrt.so(_Z18task_start_wrapperP10spawn_args+0x24)[0x2b56c7b97534]
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug
note: try running with RUST_LOG=rustc=1,::rt::backtrace to get further details and report the results to github.com/mozilla/rust/issues
rust: task failed at 'explicit failure', /home/rustbuild/src/rust-buildbot/slave/snap3-linux/build/src/librustc/rustc.rc:357
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustrt.so(_ZN9rust_task13begin_failureEPKcS1_m+0x4f)[0x2b56c7b9652f]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustrt.so(+0x299f1)[0x2b56c7ba69f1]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustrt.so(upcall_fail+0x1c6)[0x2b56c7b98cb6]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/libcore-c3ca5d77d81b46c1-0.6.so(+0x1059ab)[0x2b56c488d9ab]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/libcore-c3ca5d77d81b46c1-0.6.so(+0x105952)[0x2b56c488d952]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/libcore-c3ca5d77d81b46c1-0.6.so(_ZN3sys12begin_unwind16_701b8ec61f97ead3_06E+0x71)[0x2b56c47d5441]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/libcore-c3ca5d77d81b46c1-0.6.so(+0x14e214)[0x2b56c48d6214]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(_ZN7monitor17_ab3b5d4d4b9efdb63_06E+0x1577)[0x2b56c6000947]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(+0x8b9e84)[0x2b56c600ce84]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc-c84825241471686d-0.6.so(_ZN4main16_706f4ee7413ae583_06E+0x7e)[0x2b56c600ca9e]
/home/huon/rust/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustrt.so(_Z18task_start_wrapperP10spawn_args+0x24)[0x2b56c7b97534]
rust: domain main @0xa8e3c0 root task failed
make: *** [x86_64-unknown-linux-gnu/stage0/lib/rustc/x86_64-unknown-linux-gnu/lib/librustc.so] Error 101

I guess a better error message would be helpful.

[thestinger]

We can't actually give sane error messages on out-of-memory because of segmented stacks. There's no way to reliably report an error message once there's no memory left if anything can cause an allocation.

[metajack]

Closing since it seems there's nothing we can do.