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

$ go version
go version go1.16.7 linux/amd64

Does this issue reproduce with the latest release?

It was working on 1.14.9 but not after that

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

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/mahdi/.cache/go-build"
GOENV="/home/mahdi/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/mahdi/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/mahdi/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.16.7"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/dev/null"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3567533659=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Using standards debugger (Delve for instance) I tried to read some variable inside a function below is the sample code

package main

import "fmt"

type Day int

const (
	MONDAY Day = 1 + iota
	TUESDAY
	WEDNESDAY
	THURSDAY
	FRIDAY
	SATURDAY
	SUNDAY
)

var i int = 100
var f float64 = 100.1
var s string = "Hello world!"
var a [5]int = [5]int{1, 2, 3, 4, 5}
var d Day = TUESDAY
var c complex64 = 1 + 1i

func printParams(i int, f float64, s string, a [5]int, b []int, p *int, d Day, c complex64) {
	fmt.Println("Entering printParams")
	fmt.Println(i)
	fmt.Println(f)
	fmt.Println(s)
	fmt.Println(d)
	fmt.Println(c)
	for _, ai := range a {
		fmt.Println(ai)
	}
	for i := 0; i < len(b); i++ {
		fmt.Println(b[i])
	}
	b = append(b, 11)
	b = append(b, 12)
	b[0] = 14
	for i := 0; i < len(b); i++ {
		fmt.Println(b[i])
	}
	fmt.Println(*p)
	fmt.Println("Exiting printParams")
}

func main() {
	printParams(i, f, s, a, a[1:4], &i, d, 1i)
}

Also I tried to read DWARF section using readelf

What did you expect to see?

I expect to get below result while stepping into printParams function line 13 and 20:

(dlv) args
i = 100
f = 100.1
s = "Hello world!"
a = [5]int [...]
b = []int len: 3, cap: 4, [...]
p = (*int)(0x553120)
d = TUESDAY (2)
c = (0 + 1i)

And in DWARF:

<1><794f2>: Abbrev Number: 3 (DW_TAG_subprogram)
    <794f3>   DW_AT_name        : main.printParams
    <79504>   DW_AT_low_pc      : 0x491d70
    <7950c>   DW_AT_high_pc     : 0x492450
    <79514>   DW_AT_frame_base  : 1 byte block: 9c 	(DW_OP_call_frame_cfa)
    <79516>   DW_AT_decl_file   : 0x2
    <7951a>   DW_AT_external    : 1
 <2><7951b>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <7951c>   DW_AT_name        : i
    <7951e>   DW_AT_variable_parameter: 0
    <7951f>   DW_AT_decl_line   : 31
    <79520>   DW_AT_type        : <0x3b10e>
    <79524>   DW_AT_location    : 0x82ce9 (location list)
 <2><79528>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <79529>   DW_AT_name        : f
    <7952b>   DW_AT_variable_parameter: 0
    <7952c>   DW_AT_decl_line   : 31
    <7952d>   DW_AT_type        : <0x3d1a1>
    <79531>   DW_AT_location    : 0x82d1c (location list)
 <2><79535>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <79536>   DW_AT_name        : s
    <79538>   DW_AT_variable_parameter: 0
    <79539>   DW_AT_decl_line   : 31
    <7953a>   DW_AT_type        : <0x3b11e>
     <7953e>   DW_AT_location    : 0x82d50 (location list) 
<2><79542>: Abbrev Number: 15 (DW_TAG_formal_parameter)
    <79543>   DW_AT_name        : a
    <79545>   DW_AT_variable_parameter: 0
    <79546>   DW_AT_decl_line   : 31
    <79547>   DW_AT_type        : <0x49bba>
    <7954b>   DW_AT_location    : 2 byte block: 91 20 	(DW_OP_fbreg: 32)
 <2><7954e>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <7954f>   DW_AT_name        : b
    <79551>   DW_AT_variable_parameter: 0
    <79552>   DW_AT_decl_line   : 31
    <79553>   DW_AT_type        : <0x4849f>
    <79557>   DW_AT_location    : 0x82d8a (location list)
 <2><7955b>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <7955c>   DW_AT_name        : p
    <7955e>   DW_AT_variable_parameter: 0
    <7955f>   DW_AT_decl_line   : 31
    <79560>   DW_AT_type        : <0x416c0>
    <79564>   DW_AT_location    : 0x82dcb (location list)
 <2><79568>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <79569>   DW_AT_name        : d
    <7956b>   DW_AT_variable_parameter: 0
    <7956c>   DW_AT_decl_line   : 31
    <7956d>   DW_AT_type        : <0x49ba5>
    <79571>   DW_AT_location    : 0x82e00 (location list)
 <2><79575>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <79576>   DW_AT_name        : c
    <79578>   DW_AT_variable_parameter: 0
    <79579>   DW_AT_decl_line   : 31
    <7957a>   DW_AT_type        : <0x3e2bb>
    <7957e>   DW_AT_location    : 0x82e35 (location list) 

I got above result from 1.14.9 version

What did you see instead?

From the debugger I got this part instead:

(dlv) args
i = 100
f = 100.1
s = (unreadable empty OP stack) 
a = [5]int [...]
b = (unreadable could not find loclist entry at 0x8648e for address 0x497a9e) 
p = (*int)(0x535118)
d = TUESDAY (2)
c = (unreadable empty OP stack) 

And the DWARF section is like this:

<1><7d39d>: Abbrev Number: 3 (DW_TAG_subprogram)
    <7d39e>   DW_AT_name        : main.printParams
    <7d3af>   DW_AT_low_pc      : 0x497a00
    <7d3b7>   DW_AT_high_pc     : 0x4980f0
    <7d3bf>   DW_AT_frame_base  : 1 byte block: 9c 	(DW_OP_call_frame_cfa)
    <7d3c1>   DW_AT_decl_file   : 0x2
    <7d3c5>   DW_AT_external    : 1
 <2><7d3c6>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <7d3c7>   DW_AT_name        : i
    <7d3c9>   DW_AT_variable_parameter: 0
    <7d3ca>   DW_AT_decl_line   : 31
    <7d3cb>   DW_AT_type        : <0x49bde>
    <7d3cf>   DW_AT_location    : 0x8645a (location list)
 <2><7d3d3>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <7d3d4>   DW_AT_name        : f
    <7d3d6>   DW_AT_variable_parameter: 0
    <7d3d7>   DW_AT_decl_line   : 31
    <7d3d8>   DW_AT_type        : <0x4b5f2>
    <7d3dc>   DW_AT_location    : 0x8648d (location list)
 <2><7d3e0>: Abbrev Number: 15 (DW_TAG_formal_parameter)
    <7d3e1>   DW_AT_name        : s
    <7d3e3>   DW_AT_variable_parameter: 0
    <7d3e4>   DW_AT_decl_line   : 31
    <7d3e5>   DW_AT_type        : <0x49bee>
    <7d3e9>   DW_AT_location    : 0 byte block: 	() 
<2><7d3ea>: Abbrev Number: 15 (DW_TAG_formal_parameter)
    <7d3eb>   DW_AT_name        : a
    <7d3ed>   DW_AT_variable_parameter: 0
    <7d3ee>   DW_AT_decl_line   : 31
    <7d3ef>   DW_AT_type        : <0x5b0e8>
    <7d3f3>   DW_AT_location    : 2 byte block: 91 20 	(DW_OP_fbreg: 32)
 <2><7d3f6>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <7d3f7>   DW_AT_name        : b
    <7d3f9>   DW_AT_variable_parameter: 0
    <7d3fa>   DW_AT_decl_line   : 31
    <7d3fb>   DW_AT_type        : <0x5917d>
    <7d3ff>   DW_AT_location    : 0x864c1 (location list)
 <2><7d403>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <7d404>   DW_AT_name        : p
    <7d406>   DW_AT_variable_parameter: 0
    <7d407>   DW_AT_decl_line   : 31
    <7d408>   DW_AT_type        : <0x52251>
    <7d40c>   DW_AT_location    : 0x865cf (location list)
 <2><7d410>: Abbrev Number: 16 (DW_TAG_formal_parameter)
    <7d411>   DW_AT_name        : d
    <7d413>   DW_AT_variable_parameter: 0
    <7d414>   DW_AT_decl_line   : 31
    <7d415>   DW_AT_type        : <0x5b0ad>
    <7d419>   DW_AT_location    : 0x86604 (location list)
 <2><7d41d>: Abbrev Number: 15 (DW_TAG_formal_parameter)
    <7d41e>   DW_AT_name        : c
    <7d420>   DW_AT_variable_parameter: 0
    <7d421>   DW_AT_decl_line   : 31
    <7d422>   DW_AT_type        : <0x4d604>
    <7d426>   DW_AT_location    : 0 byte block: 	() 

I created another issue (#45680) before not sure whether that one cover this one or no