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Infinite compilation time in _intern_type_list #69790

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kornelski opened this issue Mar 6, 2020 · 12 comments
Closed

Infinite compilation time in _intern_type_list #69790

kornelski opened this issue Mar 6, 2020 · 12 comments
Labels
C-bug Category: This is a bug. E-needs-bisection Call for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-hang Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@kornelski
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kornelski commented Mar 6, 2020 •
edited
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I've been compiling my project with rustc 1.41.1 (f3e1a95 2020-02-24, Linux), and it has got stuck. It usually takes a few minutes, but not this time:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
27572 root      20   0 1871656  79956   1664 S 100.0  2.0   2580:27 rustc

Perf sample shows this:

  21.67%  rustc    librustc_driver-dcdfe48010e74f33.so  [.] <smallvec::SmallVec<A> as core::iter::traits::collect::FromIterator<<A as smallvec::Array>::Item>>::from_iter
  13.32%  rustc    librustc_driver-dcdfe48010e74f33.so  [.] rustc::ty::context::TyCtxt::_intern_type_list
  13.09%  rustc    librustc_driver-dcdfe48010e74f33.so  [.] rustc::ty::structural_impls::<impl rustc::ty::fold::TypeFoldable for &rustc::ty::TyS>::super_fold_with
  11.65%  rustc    librustc_driver-dcdfe48010e74f33.so  [.] rustc::ty::fold::TypeFoldable::fold_with
   8.66%  rustc    librustc_driver-dcdfe48010e74f33.so  [.] hashbrown::map::RawEntryBuilderMut<K,V,S>::from_hash
   8.01%  rustc    librustc_driver-dcdfe48010e74f33.so  [.] <rustc::ty::sty::TyKind as core::cmp::PartialEq>::eq
   7.71%  rustc    librustc_driver-dcdfe48010e74f33.so  [.] <smallvec::SmallVec<A> as core::iter::traits::collect::FromIterator<<A as smallvec::Array>::Item>>::from_iter
   4.45%  rustc    librustc_driver-dcdfe48010e74f33.so  [.] rustc::ty::fold::TypeFoldable::fold_with
   3.18%  rustc    rustc                                [.] free
   3.04%  rustc    librustc_driver-dcdfe48010e74f33.so  [.] rustc::ty::fold::TypeFoldable::fold_with

I've kept the process running, so let me know what I can do to provide you more info.
@kornelski kornelski added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Mar 6, 2020
@jonas-schievink jonas-schievink added E-needs-bisection Call for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-hang Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc. and removed I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ labels Mar 6, 2020
@jonas-schievink
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Can you provide a more self-contained reproduction? I looks like this requires running make and downloading stuff.

@kornelski
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Yeah, that's the problem — I can't. Even another compilation of the same project doesn't hang. Sometimes it's just slow or very slow. I suspect it's hitting some O(n^2) case somewhere, but perhaps depending on order of things in hash tables or something non-deterministic.

@kornelski
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perf.data.gz

@kornelski
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I've just noticed that this compilation actually was from stable, not from nightly.

@kornelski
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kornelski commented Mar 6, 2020 •
edited
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there are only 2 threads, one is asleep. The other:

 bt
* thread #2: tid = 27575, 0x00007fbdf5d96774 librustc_driver-dcdfe48010e74f33.so`_ZN63_$LT$rustc..ty..sty..TyKind$u20$as$u20$core..cmp..PartialEq$GT$2eq17h6f872122006063b6E.llvm.8369515687695553918 + 980, name = 'rustc', stop reason = signal SIGSTOP
  * frame #0: 0x00007fbdf5d96774 librustc_driver-dcdfe48010e74f33.so`_ZN63_$LT$rustc..ty..sty..TyKind$u20$as$u20$core..cmp..PartialEq$GT$2eq17h6f872122006063b6E.llvm.8369515687695553918 + 980
    frame #1: 0x00007fbdf5d86f23 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 931
    frame #2: 0x00007fbdf5bef9a0 librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h8e43a941b3aa2dcc + 112
    frame #3: 0x00007fbdf5c1b9e8 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::h701cd4d15c9062c1 + 216
    frame #4: 0x00007fbdf5d7736a librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 234
    frame #5: 0x00007fbdf5d86d87 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 519
    frame #6: 0x00007fbdf5d7757b librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 763
    frame #7: 0x00007fbdf5d86bbf librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 63
    frame #8: 0x00007fbdf5c3af24 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::hdd0a32c6216a8ac6 + 292
    frame #9: 0x00007fbdf5d73b8c librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h1cd7ea8d6967a60c + 60
    frame #10: 0x00007fbdf5d86db6 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 566
    frame #11: 0x00007fbdf5bef9a0 librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h8e43a941b3aa2dcc + 112
    frame #12: 0x00007fbdf5c1b9e8 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::h701cd4d15c9062c1 + 216
    frame #13: 0x00007fbdf5d7736a librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 234
    frame #14: 0x00007fbdf5d86d87 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 519
    frame #15: 0x00007fbdf5d7757b librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 763
    frame #16: 0x00007fbdf5d86bbf librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 63
    frame #17: 0x00007fbdf5c3af24 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::hdd0a32c6216a8ac6 + 292
    frame #18: 0x00007fbdf5d73b8c librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h1cd7ea8d6967a60c + 60
    frame #19: 0x00007fbdf5d86db6 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 566
    frame #20: 0x00007fbdf5bef9a0 librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h8e43a941b3aa2dcc + 112
    frame #21: 0x00007fbdf5c1b9e8 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::h701cd4d15c9062c1 + 216
    frame #22: 0x00007fbdf5d7736a librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 234
    frame #23: 0x00007fbdf5d86d87 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 519
    frame #24: 0x00007fbdf5d7757b librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 763
    frame #25: 0x00007fbdf5d86bbf librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 63
    frame #26: 0x00007fbdf5c3af24 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::hdd0a32c6216a8ac6 + 292
    frame #27: 0x00007fbdf5d73b8c librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h1cd7ea8d6967a60c + 60
    frame #28: 0x00007fbdf5d86db6 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 566
    frame #29: 0x00007fbdf5bef9a0 librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h8e43a941b3aa2dcc + 112
    frame #30: 0x00007fbdf5c1b9e8 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::h701cd4d15c9062c1 + 216
    frame #31: 0x00007fbdf5d7736a librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 234
    frame #32: 0x00007fbdf5d86d87 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 519
    frame #33: 0x00007fbdf5d7757b librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 763
    frame #34: 0x00007fbdf5d86bbf librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 63
    frame #35: 0x00007fbdf5c3af24 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::hdd0a32c6216a8ac6 + 292
    frame #36: 0x00007fbdf5d73b8c librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h1cd7ea8d6967a60c + 60
    frame #37: 0x00007fbdf5d86db6 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 566
    frame #38: 0x00007fbdf5bef9a0 librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h8e43a941b3aa2dcc + 112
    frame #39: 0x00007fbdf5c1b9e8 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::h701cd4d15c9062c1 + 216
    frame #40: 0x00007fbdf5d7736a librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 234
    frame #41: 0x00007fbdf5d86d87 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 519
    frame #42: 0x00007fbdf5d7757b librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 763
    frame #43: 0x00007fbdf5d86bbf librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 63
    frame #44: 0x00007fbdf5c3af24 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::hdd0a32c6216a8ac6 + 292
    frame #45: 0x00007fbdf5d73b8c librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h1cd7ea8d6967a60c + 60
    frame #46: 0x00007fbdf5d86db6 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 566
    frame #47: 0x00007fbdf5bef9a0 librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h8e43a941b3aa2dcc + 112
    frame #48: 0x00007fbdf5c1b9e8 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::h701cd4d15c9062c1 + 216
    frame #49: 0x00007fbdf5d7736a librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 234
    frame #50: 0x00007fbdf5d86d87 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 519
    frame #51: 0x00007fbdf5d7757b librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 763
    frame #52: 0x00007fbdf5d86bbf librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 63
    frame #53: 0x00007fbdf5d7757b librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 763
    frame #54: 0x00007fbdf5d86bbf librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 63
    frame #55: 0x00007fbdf5d7757b librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 763
    frame #56: 0x00007fbdf5d86bbf librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 63
    frame #57: 0x00007fbdf5c3af24 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::hdd0a32c6216a8ac6 + 292
    frame #58: 0x00007fbdf5d73b8c librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h1cd7ea8d6967a60c + 60
    frame #59: 0x00007fbdf5d86db6 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 566
    frame #60: 0x00007fbdf5bef9a0 librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h8e43a941b3aa2dcc + 112
    frame #61: 0x00007fbdf5c1b9e8 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::h701cd4d15c9062c1 + 216
    frame #62: 0x00007fbdf5d7736a librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 234
    frame #63: 0x00007fbdf5d86d87 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 519
    frame #64: 0x00007fbdf5d7757b librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 763
    frame #65: 0x00007fbdf5d86bbf librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 63
    frame #66: 0x00007fbdf5c3af24 librustc_driver-dcdfe48010e74f33.so`_$LT$smallvec..SmallVec$LT$A$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$$LT$A$u20$as$u20$smallvec..Array$GT$..Item$GT$$GT$::from_iter::hdd0a32c6216a8ac6 + 292
    frame #67: 0x00007fbdf5d73b8c librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h1cd7ea8d6967a60c + 60
    frame #68: 0x00007fbdf5d86db6 librustc_driver-dcdfe48010e74f33.so`rustc::ty::structural_impls::_$LT$impl$u20$rustc..ty..fold..TypeFoldable$u20$for$u20$$RF$rustc..ty..TyS$GT$::super_fold_with::hc2c017855d7c3071 + 566
    frame #69: 0x00007fbdf5bef9a0 librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h8e43a941b3aa2dcc + 112
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    frame #247: 0x00007fbdf4cd269a librustc_driver-dcdfe48010e74f33.so`rustc::ty::query::__query_compute::check_mod_item_types::h32dd855f70fff23a + 106
    frame #248: 0x00007fbdf4c0b1ab librustc_driver-dcdfe48010e74f33.so`rustc::ty::query::_$LT$impl$u20$rustc..ty..query..config..QueryAccessors$u20$for$u20$rustc..ty..query..queries..check_mod_item_types$GT$::compute::h2585c216270b5edd + 27
    frame #249: 0x00007fbdf4b9a2fd librustc_driver-dcdfe48010e74f33.so`_ZN5rustc9dep_graph5graph8DepGraph14with_task_impl17h1fd3e518a9777d03E.llvm.11505891816584312476 + 221
    frame #250: 0x00007fbdf4c650fe librustc_driver-dcdfe48010e74f33.so`rustc::ty::query::plumbing::_$LT$impl$u20$rustc..ty..context..TyCtxt$GT$::get_query::ha3ba6731d1250408 + 3694

Unfortunately lldb doesn't see any variables.

@jonas-schievink
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Does it happen on kitchen_sink? If so I can reproduce I think.

@jonas-schievink
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Ah, no, that seems to take a pathological time in item-types checking (which is unusual), but finished after ~1 minute in that phase.

@jonas-schievink
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Oh, neat, that one is almost completely gone on nightly :)

@jonas-schievink
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reindex_crates and front_end also compile excruciatingly slowly, is that normal? This does not seem to be an issue on nightly, maybe you can use that instead (and report back when the issue reappears there).

@kornelski
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Yeah, sorry. I thought it (also) happened on nightly this time, but seems that my deploy didn't pick the right toolchain. It is tolerable on nightly.

The compilation is painfully slow. I think it got worse after I added async/await. I've ended up creating futures that have 80KB of state :)

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kornelski commented Mar 7, 2020 •
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Thanks for having a look. I'll try to make a more specific report later.

@jonas-schievink
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Oh, wow, then my generator compiletime improvements might have fixed this (#68672 and #68606). I didn't realize they'd have such a huge impact on real-world projects. Cool!

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C-bug Category: This is a bug. E-needs-bisection Call for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-hang Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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