Infinite compilation time in _intern_type_list

[kornelski]

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.

[jonas-schievink]

Can you provide a more self-contained reproduction? I looks like this requires running make and downloading stuff.

[kornelski]

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]

perf.data.gz

[kornelski]

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

[kornelski]

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$::from_iter::h701cd4d15c9062c1 + 216
    frame #62: 0x00007fbdf5d7736a librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 234
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    frame #64: 0x00007fbdf5d7757b librustc_driver-dcdfe48010e74f33.so`rustc::ty::fold::TypeFoldable::fold_with::h9484cffb72971c0b + 763
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    frame #66: 0x00007fbdf5c3af24 librustc_driver-dcdfe48010e74f33.so`_$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
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Unfortunately lldb doesn't see any variables.

[jonas-schievink]

Does it happen on kitchen_sink? If so I can reproduce I think.

[jonas-schievink]

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]

Oh, neat, that one is almost completely gone on nightly :)