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Sporadic test failure in LinearAlgebra/matmul.jl #44635

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@timholy

Description

@timholy
Member

We sporadically (<5%) get a test failure (example: https://buildkite.com/julialang/julia-master/builds/10097#eee6dda2-d1bf-4118-aa04-5056c642eb4f) for which the first stacktrace is

�[91m�[1mError During Test�[22m�[39m at �[39m�[1m/cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/stdlib/v1.9/LinearAlgebra/test/matmul.jl:232�[22m
  Got exception outside of a @test

  ArgumentError: colons must be converted by to_indices(...)

  Stacktrace:

    [1] to_index(#unused#::Colon)

      @ Base ./indices.jl:299

    [2] to_index(A::Matrix{ComplexF32}, i::Function)

      @ Base ./indices.jl:277

    [3] to_indices

      @ ./indices.jl:333 [inlined]

    [4] to_indices

      @ ./indices.jl:324 [inlined]

    [5] view(::Matrix{ComplexF32}, ::Function, ::UnitRange{Int64})

      @ Base ./subarray.jl:176

    [6] macro expansion

      @ /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/stdlib/v1.9/LinearAlgebra/test/matmul.jl:237 [inlined]

    [7] macro expansion

      @ /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/stdlib/v1.9/Test/src/Test.jl:1433 [inlined]

    [8] macro expansion

      @ /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/stdlib/v1.9/LinearAlgebra/test/matmul.jl:232 [inlined]

    [9] top-level scope

      @ /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/stdlib/v1.9/Test/src/Test.jl:1433 [inlined]

   [10] top-level scope

      @ /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/stdlib/v1.9/LinearAlgebra/test/matmul.jl:0

   [11] include

      @ ./Base.jl:429 [inlined]

   [12] macro expansion

      @ /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/test/testdefs.jl:24 [inlined]

   [13] macro expansion

      @ /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/stdlib/v1.9/Test/src/Test.jl:1357 [inlined]

   [14] macro expansion

      @ /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/test/testdefs.jl:23 [inlined]

   [15] macro expansion

      @ ./timing.jl:440 [inlined]

   [16] runtests(name::String, path::String, isolate::Bool; seed::UInt128)

      @ Main /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/test/testdefs.jl:21

   [17] invokelatest(::Any, ::Any, ::Vararg{Any}; kwargs::Base.Pairs{Symbol, UInt128, Tuple{Symbol}, NamedTuple{(:seed,), Tuple{UInt128}}})

      @ Base ./essentials.jl:731

   [18] (::Distributed.var"#106#108"{Distributed.CallMsg{:call_fetch}})()

      @ Distributed /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/stdlib/v1.9/Distributed/src/process_messages.jl:285

   [19] run_work_thunk(thunk::Distributed.var"#106#108"{Distributed.CallMsg{:call_fetch}}, print_error::Bool)

      @ Distributed /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/stdlib/v1.9/Distributed/src/process_messages.jl:70

   [20] macro expansion

      @ /cache/build/default-amdci4-0/julialang/julia-master/julia-0c9c484d19/share/julia/stdlib/v1.9/Distributed/src/process_messages.jl:285 [inlined]

   [21] (::Distributed.var"#105#107"{Distributed.CallMsg{:call_fetch}, Distributed.MsgHeader, Sockets.TCPSocket})()

      @ Distributed ./task.jl:476

I was going to guess is that it depends on what other tests might have run on the same node, but in this case it appears to be the first test run on that node. I am therefore at a bit of a loss.

Activity

added
testThis change adds or pertains to unit tests
on Mar 16, 2022
added
bugIndicates an unexpected problem or unintended behavior
on Mar 17, 2022
Keno

Keno commented on Mar 17, 2022

@Keno
Member

Looks like we have an rr trace there, so should be quite debuggable.

Keno

Keno commented on Mar 17, 2022

@Keno
Member

Just to clarify, what I'm seeing in the backtrace is:

[2] to_index(A::SubArray{Int64, 3, Array{Int64, 3}, Tuple{StepRange{Int64, Int64}, Base.Slice{Base.OneTo{Int64}}, Base.Slice{Base.OneTo{Int64}}}, false}, i::Function) @ Base ./indices.jl:277
[3] to_indices @ ./indices.jl:333 [inlined]
[4] to_indices @ ./indices.jl:324 [inlined]

Do we think that the 4->3 call is wrong because it should have dispatched to the one in mutlidimensional.jl instead?

Keno

Keno commented on Mar 17, 2022

@Keno
Member

Just on a regular master build, that's the optimized IR for that call, which all seems correct, so I guess we just need to look at the rr trace and see what's different about it.

%-1  = invoke to_indices(::SubArray{…},::Tuple{…})::…
324 1 ── %1  = Base.getfield(A, :indices)::Tuple{StepRange{Int64, Int64}, Base.Slice{Base.OneTo{Int64}}, Base.Slice{Base.OneTo{Int64}}}   │╻╷       axes
    │    %2  = Core.getfield(%1, 1)::StepRange{Int64, Int64}                                                                              ││       
    └─── %3  = invoke Base.length(%2::StepRange{Int64, Int64})::Int64                                                                     ││╻        _indices_sub
    2 ── %4  = Base.slt_int(%3, 0)::Bool                                                                                                  │││┃│╷╷╷╷   axes
    │    %5  = Core.ifelse::Core.Const(Core.ifelse)                                                                                       ││││╻        oneto
    │    %6  = (%5)(%4, 0, %3)::Int64                                                                                                     │││││┃│││     OneTo
    │    %7  = %new(Base.OneTo{Int64}, %6)::Base.OneTo{Int64}                                                                             ││││││┃        OneTo
    └───       goto #3                                                                                                                    │││││││  
    3 ──       goto #4                                                                                                                    ││││││   
    4 ──       goto #5                                                                                                                    │││││    
    5 ──       goto #6                                                                                                                    ││││     
    6 ──       goto #7                                                                                                                    │││      
    7 ──       goto #8                                                                                                                    ││       
    8 ── %14 = (isa)(I, Tuple{Colon, Vector{Int64}, SubArray{Int64, 2, UnitRange{Int64}, Tuple{Matrix{Int64}}, false}})::Bool             │        
    └───       goto #10 if not %14                                                                                                        │        
    9 ── %16 = π (I, Tuple{Colon, Vector{Int64}, SubArray{Int64, 2, UnitRange{Int64}, Tuple{Matrix{Int64}}, false}})                      │        
    │    %17 = %new(Base.Slice{Base.OneTo{Int64}}, %7)::Base.Slice{Base.OneTo{Int64}}                                                     ││╻╷╷      uncolon
    │    %18 = Core.getfield(%16, 2)::Vector{Int64}                                                                                       ││╻        tail
    │    %19 = Core.getfield(%16, 3)::SubArray{Int64, 2, UnitRange{Int64}, Tuple{Matrix{Int64}}, false}                                   │││      
    │    %20 = Core.tuple(%17, %18, %19)::Tuple{Base.Slice{Base.OneTo{Int64}}, Vector{Int64}, SubArray{Int64, 2, UnitRange{Int64}, Tuple{Matrix{Int64}}, false}}
    └───       goto #12                                                                                                                   │        
    10 ─       nothing::Nothing                                                                                                           │        
    11 ─ %23 = Base.getfield(I, 1, true)::Function                                                                                        ││╻        getindex
    │          invoke Base.to_index(A::SubArray{Int64, 3, Array{Int64, 3}, Tuple{StepRange{Int64, Int64}, Base.Slice{Base.OneTo{Int64}}, Base.Slice{Base.OneTo{Int64}}}, false}, %23::Function)::Union{}
    └───       unreachable                                                                                                                ││       
    12 ─       return %20      
Keno

Keno commented on Mar 17, 2022

@Keno
Member

Hmm, I would have expected the test failure to trigger the breakpoint here: https://github.com/JuliaLang/julia/blame/master/stdlib/Test/src/Test.jl#L655, but I don't see it in the trace.

Keno

Keno commented on Mar 17, 2022

@Keno
Member

Ah, that's because it was inside a @testset, but outside an @test. I'll add a similar call for that case. I'll see if I can find the failing test anyway, but it might be a bit annoying so we may just want to wait for the next failure after I make that change.

added a commit that references this issue on Mar 17, 2022
Keno

Keno commented on Mar 17, 2022

@Keno
Member

I'll add a similar call for that case.

#44652

I'm a bit short on time, so unless somebody else wants to go digging, I say let's get that merged and wait for another rr trace that includes that change, so it'll be easier to find.

Keno

Keno commented on Mar 24, 2022

@Keno
Member

We have this captured in https://buildkite.com/julialang/julia-master/builds/10284#c8607f85-b173-49f9-a0fe-c1d1586d6ccf julia-1 at

(rr) when
Current event: 2322578
(rr) when-ticks
Current tick: 244897166483
Keno

Keno commented on Mar 24, 2022

@Keno
Member

So the last generic call before the error compiles something. The arguments are:

(rr) p jl_(F)
Base.view
         $14 = void
(rr) p jl_(args[0])
Base.SubArray{Int64, 3, Array{Int64, 3}, Tuple{Array{Int64, 1}, Base.Slice{Base.OneTo{Int64}}, Base.UnitRange{Int64}}, false}(parent=Array{Int64, (13, 13, 13)}[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 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590, 591, 592, 593, 594, 595, 596, 597, 598, 599, 600, 601, 602, 603, 604, 605, 606, 607, 608, 609, 610, 611, 612, 613, 614, 615, 616, 617, 618, 619, 620, 621, 622, 623, 624, 625, 626, 627, 628, 629, 630, 631, 632, 633, 634, 635, 636, 637, 638, 639, 640, 641, 642, 643, 644, 645, 646, 647, 648, 649, 650, 651, 652, 653, 654, 655, 656, 657, 658, 659, 660, 661, 662, 663, 664, 665, 666, 667, 668, 669, 670, 671, 672, 673, 674, 675, 676, 677, 678, 679, 680, 681, 682, 683, 684, 685, 686, 687, 688, 689, 690, 691, 692, 693, 694, 695, 696, 697, 698, 699, 700, 701, 702, 703, 704, 705, 706, 707, 708, 709, 710, 711, 712, 713, 714, 715, 716, 717, 718, 719, 720, 721, 722, 723, 724, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736, 737, 738, 739, 740, 741, 742, 743, 744, 745, 746, 747, 748, 749, 750, 751, 752, 753, 754, 755, 756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768, 769, 770, 771, 772, 773, 774, 775, 776, 777, 778, 779, 780, 781, 782, 783, 784, 785, 786, 787, 788, 789, 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(rr) p jl_(args[1])
Base.Any
        $15 = void
(rr) p jl_(args[2])
Base.UnitRange{Int64}(start=2, stop=5)
(rr) p jl_(args[3])
Base.SubArray{Int64, 2, Base.UnitRange{Int64}, Tuple{Array{Int64, 2}}, false}(parent=Base.UnitRange{Int64}(start=1, stop=5), indices=(Array{Int64, (1, 4)}[2, 3, 4, 1],), offset1=0, stride1=0)

I don't really know how args[1] ended up as Any. Seems like that should be Colon.

Keno

Keno commented on Mar 24, 2022

@Keno
Member

Hmm:

(rr) p jl_(jl_typeof(args[2]))
Tuple{Base.Colon, Base.UnitRange{Int64}, Base.SubArray{Int64, 2, Base.UnitRange{Int64}, Tuple{Array{Int64, 2}}, false}}

(rr) p jl_(args[2])
(Base.Any, Base.UnitRange{Int64}(start=2, stop=5), Base.SubArray{Int64, 2, Base.UnitRange{Int64}, Tuple{Array{Int64, 2}}, false}(parent=Base.UnitRange{Int64}(start=1, stop=5), indices=(Array{Int64, (1, 4)}[2, 3, 4, 1],), offset1=0, stride1=0))
Keno

Keno commented on Mar 24, 2022

@Keno
Member

Ah, nevermind. That's just a printing bug in jl_:

julia> ccall(:jl_, Cvoid, (Any,), Colon())
Base.Any
added a commit that references this issue on Mar 24, 2022
added a commit that references this issue on Mar 24, 2022
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        Sporadic test failure in LinearAlgebra/matmul.jl · Issue #44635 · JuliaLang/julia