rustc build from HEAD panicks

[untitaker]

Archlinux:

$ RUST_BACKTRACE=1 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: enabling more debugging (CFG_ENABLE_DEBUG)
cfg: host for x86_64-unknown-linux-gnu is x86_64
cfg: os for x86_64-unknown-linux-gnu is unknown-linux-gnu
cfg: good valgrind for x86_64-unknown-linux-gnu is 1
cfg: using CC=gcc (CFG_CC)
cfg: enabling valgrind run-pass tests (CFG_ENABLE_VALGRIND_RPASS)
rustc: x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblog
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' panicked at 'assertion failed: end <= self.len()', /home/untitaker/projects/rust/src/libcore/slice.rs:432

stack backtrace:
   1:     0x7f8681a534e0 - rt::backtrace::imp::write::h8f3ddc8f415cb59aGOx
   2:     0x7f8681a56720 - failure::on_fail::h7cd43dba16cc0f876fy
   3:     0x7f868169d830 - unwind::begin_unwind_inner::h0395964cdbdfc487CJc
   4:     0x7f868169d330 - unwind::begin_unwind_fmt::h2d5fc7181bcc7c37ZGc
   5:     0x7f868169d2f0 - rust_begin_unwind
   6:     0x7f86816efc90 - panicking::panic_fmt::h8f65394db1e5cd12Rtl
   7:     0x7f86816ed990 - panicking::panic::h29878e5b2190a75ahrl
   8:     0x7f867ffa0780 - metadata::loader::Context<'a>::extract_one::hfe6ef78f810a3f33Pww
   9:     0x7f867ff993f0 - metadata::loader::Context<'a>::find_library_crate::h3139dc8ccd572619bnw
  10:     0x7f867ff94bf0 - metadata::loader::Context<'a>::load_library_crate::h64f05663732f82faRew
  11:     0x7f867ff8f970 - metadata::creader::resolve_crate::hab96be16e8d4eb78u6u
  12:     0x7f867ff89f00 - metadata::creader::Env<'a>.visit..Visitor<'v>::visit_view_item::hda55b65fa089a578pzu
  13:     0x7f867ff89320 - metadata::creader::read_crates::hb3f52378c8eedcd4jyu
  14:     0x7f8681ec2760 - util::common::time::h13602981685918876014
  15:     0x7f8681e83120 - driver::phase_3_run_analysis_passes::hd743276d656939a0Cta
  16:     0x7f8681e71eb0 - driver::compile_input::hfdfb71bde631b671pba
  17:     0x7f8681f0e9c0 - run_compiler::ha3c7a06f8b4d7dccEYb
  18:     0x7f8681f0e8b0 - run::closure.21405
  19:     0x7f8681f202c0 - task::TaskBuilder::try_future::closure.22859
  20:     0x7f8681a2b960 - task::TaskBuilder::spawn_internal::closure.30614
  21:     0x7f868169b4d0 - task::Task::spawn::closure.5729
  22:     0x7f8681702ab0 - rust_try_inner
  23:     0x7f8681702aa0 - rust_try
  24:     0x7f868169b5b0 - unwind::try::h8902e4b3c8b1997fTyc
  25:     0x7f868169b370 - task::Task::run::h1ea22de48de2edbdfKb
  26:     0x7f868169af60 - task::Task::spawn::closure.5705
  27:     0x7f868169c9b0 - thread::thread_start::h5b83d88cdd72e2e4w1b
  28:     0x7f867c72e250 - start_thread
  29:     0x7f8681372589 - clone
  30:                0x0 - <unknown>

/home/untitaker/projects/rust/mk/target.mk:165: recipe for target 'x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib/stamp.log' failed
make: *** [x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib/stamp.log] Error 101

I'll fiddle around with gdb later.

[steveklabnik]

make clean should fix this.

[alexcrichton]

Yes, and if this reproduces afterwards, feel free to reopen!

[untitaker]

Indeed it did, thanks!

@alexcrichton FWIW I wouldn't have been able to reopen this issue, since you closed it. I would've been able to reopen only if I closed it myself.