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Unreachable reached #34207

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jagot opened this issue Dec 28, 2019 · 5 comments · Fixed by #34243
Closed

Unreachable reached #34207

jagot opened this issue Dec 28, 2019 · 5 comments · Fixed by #34243
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bug Indicates an unexpected problem or unintended behavior compiler:codegen Generation of LLVM IR and native code

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@jagot
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jagot commented Dec 28, 2019

TOMLs attached. This occurs on nightly, but not on 1.0–1.3. On Linux "Unreachable reached" is printed, on macOS, it simply segfaults:

/Applications/Julia-1.4.app/Contents/Resources/julia/bin/julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.4.0-DEV.667 (2019-12-27)
 _/ |\__'_|_|_|\__'_|  |  Commit acb7bd93fb (0 days old master)
|__/                   |

(@v1.4) pkg> activate .
Activating environment at `/private/tmp/crash/Project.toml`
julia> using AtomicLevels, HalfIntegers

julia> function crash(a, b)
           ao,bo = Orbital(:k, a.orb.ℓ),Orbital(:k, b.orb.ℓ)
           i,j = ao  bo ? (1,2) : (2,1)
           uv = (ao,bo)[[i,j]]
           m′m = (abs(a.m[1]), abs(b.m[1]))
           # Intermittent segfault on next line
           m′,m = uv[1] < uv[2] ? m′m[[i,j]] : reverse(minmax(m′m...))
       end
crash (generic function with 1 method)

julia> o = SpinOrbital(o"ks", 0, half(1))
ks₀α

julia> crash(o, o)

signal (11): Segmentation fault: 11
in expression starting at REPL[5]:1
_platform_strcmp at /usr/lib/system/libsystem_platform.dylib (unknown line)
Allocations: 30720411 (Pool: 30719296; Big: 1115); GC: 6
zsh: segmentation fault  /Applications/Julia-1.4.app/Contents/Resources/julia/bin/julia

TOMLs.zip

@Keno
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Keno commented Dec 28, 2019

Slight reduction:

julia> function crash()
           ao,bo = Orbital(:k, 1),Orbital(:k, 2)
           i,j = ao ≤ bo ? (1,2) : (2,1)
           uv = (ao,bo)[[i,j]]
           # Intermittent segfault on next line
           uv[1] < uv[2]
       end

What's happening is that the runtime is producing a 2-tuple as a pair of pointers, but codegen is expecting the allocation to be inline.

@JeffBezanson
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Ah, then perhaps related to #34206?

Keno added a commit that referenced this issue Dec 28, 2019
This fastpath wasn't checking whether or not the element type
was inline allocated or not.

Fixes #34206
Fixes #34207
Keno added a commit that referenced this issue Dec 28, 2019
This fastpath wasn't checking whether or not the element type
was inline allocated or not.

Fixes #34206
Fixes #34207
@Keno Keno added bug Indicates an unexpected problem or unintended behavior compiler:codegen Generation of LLVM IR and native code labels Dec 28, 2019
@jagot
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jagot commented Dec 28, 2019

I really appreciate you for fixing these weird edge cases I always seem to come up with :)

@Keno
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Keno commented Dec 28, 2019

This wasn't really that weird an edge case, just a fairly recent regression you happened to stumble upon.

@jagot
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jagot commented Dec 28, 2019

I'm happy anyway

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Labels
bug Indicates an unexpected problem or unintended behavior compiler:codegen Generation of LLVM IR and native code
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