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cmd/compile: internal compiler error #15961

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cznic opened this issue Jun 5, 2016 · 6 comments
Closed

cmd/compile: internal compiler error #15961

cznic opened this issue Jun 5, 2016 · 6 comments
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Go1.7

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@cznic
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cznic commented Jun 5, 2016

  1. What version of Go are you using (go version)?
    go1.7beta1 3c6b668
  2. What operating system and processor architecture are you using (go env)?
    Linux (Ubuntu Mate 16.04 LTS) 64bit / x86_64.
  3. What did you do?
$ cd $GOPATH/src/github.com/cznic/y
$ go test
  1. What did you expect to see?
    PASS
  2. What did you see instead?
jnml@4670:~/src/github.com/cznic/y$ go test
# github.com/cznic/y
<autogenerated>:6: internal compiler error: want FUNC, but have int

goroutine 1 [running]:
runtime/debug.Stack(0x0, 0x0, 0x0)
    /home/jnml/go/src/runtime/debug/stack.go:24 +0x79
cmd/compile/internal/gc.Fatalf(0x8f8c0c, 0x14, 0xc421ab5500, 0x2, 0x2)
    /home/jnml/go/src/cmd/compile/internal/gc/subr.go:165 +0x248
cmd/compile/internal/gc.(*Type).wantEtype(0xc4203ae190, 0x13)
    /home/jnml/go/src/cmd/compile/internal/gc/type.go:676 +0xe7
cmd/compile/internal/gc.(*Type).ResultsP(0xc4203ae190, 0x0)
    /home/jnml/go/src/cmd/compile/internal/gc/type.go:697 +0x30
cmd/compile/internal/gc.(*Type).Results(0xc4203ae190, 0xc421b59200)
    /home/jnml/go/src/cmd/compile/internal/gc/type.go:703 +0x2b
cmd/compile/internal/gc.initEscretval(0xc421b26b40, 0xc421b59200, 0xc4203ae190)
    /home/jnml/go/src/cmd/compile/internal/gc/esc.go:1387 +0x86
cmd/compile/internal/gc.esccall(0xc421b26b40, 0xc421b59200, 0xc421b59290)
    /home/jnml/go/src/cmd/compile/internal/gc/esc.go:1540 +0xe4e
cmd/compile/internal/gc.esc(0xc421b26b40, 0xc421b59200, 0xc421b59290)
    /home/jnml/go/src/cmd/compile/internal/gc/esc.go:796 +0x64d
cmd/compile/internal/gc.esclist(0xc421b26b40, 0xc4208eeb20, 0xc421b59290)
    /home/jnml/go/src/cmd/compile/internal/gc/esc.go:602 +0x68
cmd/compile/internal/gc.esc(0xc421b26b40, 0xc421b59290, 0xc421b58b40)
    /home/jnml/go/src/cmd/compile/internal/gc/esc.go:656 +0x28a
cmd/compile/internal/gc.esclist(0xc421b26b40, 0xc4208eeb00, 0xc421b58b40)
    /home/jnml/go/src/cmd/compile/internal/gc/esc.go:602 +0x68
cmd/compile/internal/gc.escfunc(0xc421b26b40, 0xc421b58b40)
    /home/jnml/go/src/cmd/compile/internal/gc/esc.go:544 +0x1b6
cmd/compile/internal/gc.escAnalyze(0xc421ab64e0, 0x1, 0x1, 0x0)
    /home/jnml/go/src/cmd/compile/internal/gc/esc.go:467 +0x4a2
cmd/compile/internal/gc.genwrapper(0xc4207bf900, 0xc420fbbf80, 0xc420ad9f10, 0x1)
    /home/jnml/go/src/cmd/compile/internal/gc/subr.go:1907 +0xa42
cmd/compile/internal/gc.methods(0xc4207bf900, 0x2e3c8c9a, 0x4, 0x14)
    /home/jnml/go/src/cmd/compile/internal/gc/reflect.go:351 +0x608
cmd/compile/internal/gc.uncommonSize(0xc4207bf900, 0x10)
    /home/jnml/go/src/cmd/compile/internal/gc/reflect.go:75 +0x47
cmd/compile/internal/gc.dcommontype(0xc420c401c0, 0x14, 0xc4207bf900, 0x9)
    /home/jnml/go/src/cmd/compile/internal/gc/reflect.go:854 +0x1f6
cmd/compile/internal/gc.dtypesym(0xc4207bf900, 0xc4207bf900)
    /home/jnml/go/src/cmd/compile/internal/gc/reflect.go:1280 +0xd6b
cmd/compile/internal/gc.dcommontype(0xc420c4a150, 0x0, 0xc420f79cc0, 0x0)
    /home/jnml/go/src/cmd/compile/internal/gc/reflect.go:823 +0xaad
cmd/compile/internal/gc.dtypesym(0xc420f79cc0, 0xc420f37180)
    /home/jnml/go/src/cmd/compile/internal/gc/reflect.go:1149 +0xc2b
cmd/compile/internal/gc.dtypesym(0xc420f79720, 0xc420f79720)
    /home/jnml/go/src/cmd/compile/internal/gc/reflect.go:1290 +0xe91
cmd/compile/internal/gc.dtypesym(0xc420f79e00, 0xc420f6b500)
    /home/jnml/go/src/cmd/compile/internal/gc/reflect.go:1278 +0xd37
cmd/compile/internal/gc.dtypesym(0xc420f79680, 0xc42139e000)
    /home/jnml/go/src/cmd/compile/internal/gc/reflect.go:1290 +0xe91
cmd/compile/internal/gc.dumptypestructs()
    /home/jnml/go/src/cmd/compile/internal/gc/reflect.go:1363 +0xcc
cmd/compile/internal/gc.dumpobj1(0x7ffcbac9f045, 0x44, 0x3)
    /home/jnml/go/src/cmd/compile/internal/gc/obj.go:133 +0x553
cmd/compile/internal/gc.dumpobj()
    /home/jnml/go/src/cmd/compile/internal/gc/obj.go:45 +0x52
cmd/compile/internal/gc.Main()
    /home/jnml/go/src/cmd/compile/internal/gc/main.go:488 +0x1a56
cmd/compile/internal/amd64.Main()
    /home/jnml/go/src/cmd/compile/internal/amd64/galign.go:93 +0x2fa
main.main()
    /home/jnml/go/src/cmd/compile/main.go:33 +0x2a3

FAIL    github.com/cznic/y [build failed]
jnml@4670:~/src/github.com/cznic/y$

The issue is specific to go1.7beta1, no problem with stable (go1.6.1).
@josharian
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Bisect points to 4a7aba7 (CL 21233). Maybe namedAuto is creating malformed Nodes/Types? cc @randall77

@josharian josharian added this to the Go1.7 milestone Jun 5, 2016
@randall77
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Seems like using the name len as a method name triggers the bug. I'll see if I can make a fix tomorrow.

@randall77 randall77 self-assigned this Jun 5, 2016
@josharian
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josharian commented Jun 5, 2016 •
edited

Makes sense—there's then an ambiguity about what x.len is. Fix might be as simple as changing +".len" to +"..len" in SplitSlice, and mutatis mutandis for the other suffixes in that CL.

@josharian
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Did a quick check and that fix works. I didn't have any luck distilling a small, simple, standalone test, though, which is why I haven't mailed a CL. Keith, do you still plan to fix this, or should I work harder at extracting a test case?

@randall77
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I have a CL at https://go-review.googlesource.com/#/c/23789/ . I didn't mess with the names, just made a fake package for the autos so they don't interfere.
Still needs a test. I'll try to get one together tonight.

@gopherbot
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CL https://golang.org/cl/23789 mentions this issue.

@golang golang locked and limited conversation to collaborators Jun 7, 2017
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