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errors: unbounded recursion with array Unwrap() #59098

Closed
zx2c4 opened this issue Mar 17, 2023 · 3 comments
Closed

errors: unbounded recursion with array Unwrap() #59098

zx2c4 opened this issue Mar 17, 2023 · 3 comments
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FrozenDueToAge NeedsDecision Feedback is required from experts, contributors, and/or the community before a change can be made.
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Backlog

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@zx2c4
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zx2c4 commented Mar 17, 2023

I'm not sure if this should be considered a bug or not, but this code will cause a stack overflow:

package main

import "errors"

type a map[int]int

func (a a) Error() string {
	return ""
}

func (a a) Unwrap() []error {
	return []error{a}
}

func main() {
	var a a
	errors.Is(a, a)
}
zx2c4@thinkpad /tmp $ go run a.go
runtime: goroutine stack exceeds 1000000000-byte limit
runtime: sp=0xc020160360 stack=[0xc020160000, 0xc040160000]
fatal error: stack overflow

runtime stack:
runtime.throw({0x4685af?, 0x4c28c0?})
        /usr/lib/go/src/runtime/panic.go:1047 +0x5d fp=0xc00009de18 sp=0xc00009dde8 pc=0x42c99d
runtime.newstack()
        /usr/lib/go/src/runtime/stack.go:1105 +0x5bd fp=0xc00009dfc8 sp=0xc00009de18 pc=0x44411d
runtime.morestack()
        /usr/lib/go/src/runtime/asm_amd64.s:574 +0x8b fp=0xc00009dfd0 sp=0xc00009dfc8 pc=0x454f8b

goroutine 1 [running]:
runtime.deductAssistCredit(0x10?)
        /usr/lib/go/src/runtime/malloc.go:1201 +0x7b fp=0xc020160370 sp=0xc020160368 pc=0x40b43b
runtime.mallocgc(0x10, 0x45e180, 0x1)
        /usr/lib/go/src/runtime/malloc.go:932 +0xd0 fp=0xc0201603d8 sp=0xc020160370 pc=0x40ac30
runtime.newobject(0x4613c0?)
        /usr/lib/go/src/runtime/malloc.go:1254 +0x27 fp=0xc020160400 sp=0xc0201603d8 pc=0x40b547
main.a.Unwrap(0x0)
        /tmp/a.go:12 +0x25 fp=0xc020160420 sp=0xc020160400 pc=0x4589c5
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:63 +0x202 fp=0xc020160498 sp=0xc020160420 pc=0x458842
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160510 sp=0xc020160498 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160588 sp=0xc020160510 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160600 sp=0xc020160588 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160678 sp=0xc020160600 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201606f0 sp=0xc020160678 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160768 sp=0xc0201606f0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201607e0 sp=0xc020160768 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160858 sp=0xc0201607e0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201608d0 sp=0xc020160858 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160948 sp=0xc0201608d0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201609c0 sp=0xc020160948 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160a38 sp=0xc0201609c0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160ab0 sp=0xc020160a38 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160b28 sp=0xc020160ab0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160ba0 sp=0xc020160b28 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160c18 sp=0xc020160ba0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160c90 sp=0xc020160c18 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160d08 sp=0xc020160c90 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160d80 sp=0xc020160d08 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160df8 sp=0xc020160d80 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160e70 sp=0xc020160df8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160ee8 sp=0xc020160e70 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160f60 sp=0xc020160ee8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020160fd8 sp=0xc020160f60 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161050 sp=0xc020160fd8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201610c8 sp=0xc020161050 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161140 sp=0xc0201610c8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201611b8 sp=0xc020161140 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161230 sp=0xc0201611b8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201612a8 sp=0xc020161230 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161320 sp=0xc0201612a8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161398 sp=0xc020161320 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161410 sp=0xc020161398 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161488 sp=0xc020161410 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161500 sp=0xc020161488 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161578 sp=0xc020161500 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201615f0 sp=0xc020161578 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161668 sp=0xc0201615f0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201616e0 sp=0xc020161668 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161758 sp=0xc0201616e0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201617d0 sp=0xc020161758 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161848 sp=0xc0201617d0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201618c0 sp=0xc020161848 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161938 sp=0xc0201618c0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201619b0 sp=0xc020161938 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161a28 sp=0xc0201619b0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161aa0 sp=0xc020161a28 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161b18 sp=0xc020161aa0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161b90 sp=0xc020161b18 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161c08 sp=0xc020161b90 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161c80 sp=0xc020161c08 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161cf8 sp=0xc020161c80 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161d70 sp=0xc020161cf8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161de8 sp=0xc020161d70 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161e60 sp=0xc020161de8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161ed8 sp=0xc020161e60 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161f50 sp=0xc020161ed8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020161fc8 sp=0xc020161f50 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162040 sp=0xc020161fc8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201620b8 sp=0xc020162040 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162130 sp=0xc0201620b8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201621a8 sp=0xc020162130 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162220 sp=0xc0201621a8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162298 sp=0xc020162220 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162310 sp=0xc020162298 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162388 sp=0xc020162310 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162400 sp=0xc020162388 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162478 sp=0xc020162400 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201624f0 sp=0xc020162478 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162568 sp=0xc0201624f0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201625e0 sp=0xc020162568 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162658 sp=0xc0201625e0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201626d0 sp=0xc020162658 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162748 sp=0xc0201626d0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201627c0 sp=0xc020162748 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162838 sp=0xc0201627c0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201628b0 sp=0xc020162838 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162928 sp=0xc0201628b0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201629a0 sp=0xc020162928 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162a18 sp=0xc0201629a0 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162a90 sp=0xc020162a18 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162b08 sp=0xc020162a90 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162b80 sp=0xc020162b08 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162bf8 sp=0xc020162b80 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162c70 sp=0xc020162bf8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162ce8 sp=0xc020162c70 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162d60 sp=0xc020162ce8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162dd8 sp=0xc020162d60 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162e50 sp=0xc020162dd8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162ec8 sp=0xc020162e50 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162f40 sp=0xc020162ec8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020162fb8 sp=0xc020162f40 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020163030 sp=0xc020162fb8 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc0201630a8 sp=0xc020163030 pc=0x4588ae
errors.Is({0x47db38, 0x0}, {0x47db38, 0x0})
        /usr/lib/go/src/errors/wrap.go:64 +0x26e fp=0xc020163120 sp=0xc0201630a8 pc=0x4588ae
...additional frames elided...

goroutine 2 [force gc (idle)]:
runtime.gopark(0x0?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc000064fb0 sp=0xc000064f90 pc=0x42f6b6
runtime.goparkunlock(...)
        /usr/lib/go/src/runtime/proc.go:387
runtime.forcegchelper()
        /usr/lib/go/src/runtime/proc.go:305 +0xb0 fp=0xc000064fe0 sp=0xc000064fb0 pc=0x42f4f0
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000064fe8 sp=0xc000064fe0 pc=0x455221
created by runtime.init.6
        /usr/lib/go/src/runtime/proc.go:293 +0x25

goroutine 3 [GC sweep wait]:
runtime.gopark(0x1?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc000065780 sp=0xc000065760 pc=0x42f6b6
runtime.goparkunlock(...)
        /usr/lib/go/src/runtime/proc.go:387
runtime.bgsweep(0x0?)
        /usr/lib/go/src/runtime/mgcsweep.go:319 +0xde fp=0xc0000657c8 sp=0xc000065780 pc=0x41cebe
runtime.gcenable.func1()
        /usr/lib/go/src/runtime/mgc.go:178 +0x26 fp=0xc0000657e0 sp=0xc0000657c8 pc=0x412346
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000657e8 sp=0xc0000657e0 pc=0x455221
created by runtime.gcenable
        /usr/lib/go/src/runtime/mgc.go:178 +0x6b

goroutine 4 [GC scavenge wait]:
runtime.gopark(0x962a31c030bf?, 0x114e457?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc000065f70 sp=0xc000065f50 pc=0x42f6b6
runtime.goparkunlock(...)
        /usr/lib/go/src/runtime/proc.go:387
runtime.(*scavengerState).park(0x4c5a40)
        /usr/lib/go/src/runtime/mgcscavenge.go:400 +0x53 fp=0xc000065fa0 sp=0xc000065f70 pc=0x41adb3
runtime.bgscavenge(0x0?)
        /usr/lib/go/src/runtime/mgcscavenge.go:633 +0x65 fp=0xc000065fc8 sp=0xc000065fa0 pc=0x41b3a5
runtime.gcenable.func2()
        /usr/lib/go/src/runtime/mgc.go:179 +0x26 fp=0xc000065fe0 sp=0xc000065fc8 pc=0x4122e6
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000065fe8 sp=0xc000065fe0 pc=0x455221
created by runtime.gcenable
        /usr/lib/go/src/runtime/mgc.go:179 +0xaa

goroutine 17 [GC worker (idle)]:
runtime.gopark(0x412201?, 0x0?, 0xe0?, 0xd4?, 0xc000024070?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc000064750 sp=0xc000064730 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000647e0 sp=0xc000064750 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000647e8 sp=0xc0000647e0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 5 [GC worker (idle)]:
runtime.gopark(0x962a45f12b16?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc000066750 sp=0xc000066730 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000667e0 sp=0xc000066750 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000667e8 sp=0xc0000667e0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 18 [GC worker (idle)]:
runtime.gopark(0x962a45f16a20?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc000060750 sp=0xc000060730 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000607e0 sp=0xc000060750 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000607e8 sp=0xc0000607e0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 19 [GC worker (idle)]:
runtime.gopark(0x962a45f12c29?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc000060f50 sp=0xc000060f30 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc000060fe0 sp=0xc000060f50 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000060fe8 sp=0xc000060fe0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 33 [GC worker (idle)]:
runtime.gopark(0x962a45f1559e?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc0000aa750 sp=0xc0000aa730 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000aa7e0 sp=0xc0000aa750 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000aa7e8 sp=0xc0000aa7e0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 34 [GC worker (idle)]:
runtime.gopark(0x962a45f132f7?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc0000aaf50 sp=0xc0000aaf30 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000aafe0 sp=0xc0000aaf50 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000aafe8 sp=0xc0000aafe0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 35 [GC worker (idle)]:
runtime.gopark(0x962a45f120db?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc0000ab750 sp=0xc0000ab730 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000ab7e0 sp=0xc0000ab750 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000ab7e8 sp=0xc0000ab7e0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 36 [GC worker (idle)]:
runtime.gopark(0x962a45f12ed6?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc0000abf50 sp=0xc0000abf30 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000abfe0 sp=0xc0000abf50 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000abfe8 sp=0xc0000abfe0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 37 [GC worker (idle)]:
runtime.gopark(0x962a45f13278?, 0x1?, 0x55?, 0x49?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc0000ac750 sp=0xc0000ac730 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000ac7e0 sp=0xc0000ac750 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000ac7e8 sp=0xc0000ac7e0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 38 [GC worker (idle)]:
runtime.gopark(0x962a45f1218f?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc0000acf50 sp=0xc0000acf30 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000acfe0 sp=0xc0000acf50 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000acfe8 sp=0xc0000acfe0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 39 [GC worker (idle)]:
runtime.gopark(0x4f3c80?, 0x1?, 0x18?, 0x5b?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc0000ad750 sp=0xc0000ad730 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000ad7e0 sp=0xc0000ad750 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000ad7e8 sp=0xc0000ad7e0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 40 [GC worker (idle)]:
runtime.gopark(0x962a45f13225?, 0x3?, 0x77?, 0xc4?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc0000adf50 sp=0xc0000adf30 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000adfe0 sp=0xc0000adf50 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000adfe8 sp=0xc0000adfe0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 20 [GC worker (idle)]:
runtime.gopark(0x962a45f13a30?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc000061750 sp=0xc000061730 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000617e0 sp=0xc000061750 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000617e8 sp=0xc0000617e0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 41 [GC worker (idle)]:
runtime.gopark(0x962a45f12f2e?, 0x0?, 0x0?, 0x0?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc0000a6750 sp=0xc0000a6730 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc0000a67e0 sp=0xc0000a6750 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0000a67e8 sp=0xc0000a67e0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 49 [GC worker (idle)]:
runtime.gopark(0x4f3c80?, 0x3?, 0xc2?, 0x14?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc00050e750 sp=0xc00050e730 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc00050e7e0 sp=0xc00050e750 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc00050e7e8 sp=0xc00050e7e0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25

goroutine 50 [GC worker (idle)]:
runtime.gopark(0x962a45f13e30?, 0x1?, 0xcf?, 0x45?, 0x0?)
        /usr/lib/go/src/runtime/proc.go:381 +0xd6 fp=0xc00050ef50 sp=0xc00050ef30 pc=0x42f6b6
runtime.gcBgMarkWorker()
        /usr/lib/go/src/runtime/mgc.go:1275 +0xf1 fp=0xc00050efe0 sp=0xc00050ef50 pc=0x413eb1
runtime.goexit()
        /usr/lib/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc00050efe8 sp=0xc00050efe0 pc=0x455221
created by runtime.gcBgMarkStartWorkers
        /usr/lib/go/src/runtime/mgc.go:1199 +0x25
exit status 2
@cherrymui
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This is probably working as intended, as a.Unwrap creates a cycle.

cc @neild to decide.

@cherrymui cherrymui added the NeedsDecision Feedback is required from experts, contributors, and/or the community before a change can be made. label Mar 17, 2023
@cherrymui cherrymui added this to the Backlog milestone Mar 17, 2023
@neild
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neild commented Mar 17, 2023

This is working as expected. Error unwrapping chains/trees must not contain cycles.

@zx2c4
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zx2c4 commented Mar 17, 2023

Okay.

@zx2c4 zx2c4 closed this as completed Mar 17, 2023
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