ValueContext ctx.Value() panic

[Khachi-at]

What version of Go are you using (go version)?

$ go version
go1.16

Does this issue reproduce with the latest release?

Don't now

What operating system and processor architecture are you using (go env)?

context

Code example as follow.But I can't reappear agin. What can i do for it?

package test

import "context"

type Test struct {
	TraceId string
	context context.Context
}

func (p *Test) Context() context.Context {
	if p.context == nil {
		//p.context = context.WithValue(context.Background(), "trace_id", p.TraceId)
		//start := time.Now()
		//p.context = context.WithValue(p.context, "start_time", &start)
		traceId := "dddddddddddddsdd"
		p.context = context.WithValue(context.Background(), "trace_id", traceId)
	}
	return p.context
}

package main

import test "gitlab.ctyun.cn/vnet/ops/smoke-online/script/test_pkg"

var ch = make(chan *test.Test)

func getCh() chan *test.Test {
	return ch
}

func main() {
	go func() {
		testIns := &test.Test{
			TraceId: "xxxxx",
		}

		getCh() <- testIns
	}()

	newTestIns := <-ch
	trace_id, _ := newTestIns.Context().Value("trace_id").(string)
	println(trace_id)
}

Panic

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x498782]

goroutine 293 [running]:
panic({0xcc9360, 0x14976e0})
	/usr/local/go/src/runtime/panic.go:987 +0x3ba fp=0xc0003f14f0 sp=0xc0003f1430 pc=0x4379ba
runtime.panicmem(...)
	/usr/local/go/src/runtime/panic.go:260
runtime.sigpanic()
	/usr/local/go/src/runtime/signal_unix.go:835 +0x2f6 fp=0xc0003f1540 sp=0xc0003f14f0 pc=0x44e636
context.(*valueCtx).Value(0xc000414000?, {0xc86b80?, 0xf21920?})
	/usr/local/go/src/context/context.go:563 +0x22 fp=0xc0003f1578 sp=0xc0003f1540 pc=0x498782
gitlab.xxxx.cn/vnet/xxx-utils/log.(*Logger).OutputContext(0xc000229f20, {0xf2b8d8, 0x0}, 0x0?, 0x2, {0xdfe97b, 0x31}, {0xc0003f1960, 0x1, 0x1})

[seankhliao]

1.16 is outside of our supported range