GDB reporting Cannot access memory for formal arguments FLANG

Hello Everyone,

I was working on issues with debug information in FLANG, struck in a issue
Test case:
subroutine sub(a,b,c,d,e)
integer a, e
real b
double precision c, a_s
character (len=1) d
a_s = b + e
e = e + c
end
program main
integer a
real b
double precision c
character (len=1) d
integer arr(4)
arr(4) = 21
a=789
b=2.0
c=3.d0
d=‘S’
call sub(a,b,c,d,arr(4))
end

When, putting a breakpoint at subroutine sub and running the program. GDB emits –
Breakpoint 1, sub (a=<error reading variable: Cannot access memory at address 0xffffe1d000000315>, b=<error reading variable: Cannot access memory at address 0x31540000000>,
c=<error reading variable: Cannot access memory at address 0x4008000000000000>, d=<error reading variable: Cannot access memory at address 0x800000000000053>,
e=<error reading variable: Cannot access memory at address 0x15>) at test1.f90:1
1 subroutine sub(a,b,c,d,e)

GDB is not able access subroutine arguments.

.debug_loc section contents

00000000 00000000002010f0 000000000020113c (DW_OP_breg5 (rdi): 0; DW_OP_deref)
00000015
00000025 00000000002010f0 00000000002010fa (DW_OP_breg4 (rsi): 0; DW_OP_deref)
0000003a 00000000002010fa 000000000020113c (DW_OP_breg7 (rsp): -24; DW_OP_deref; DW_OP_deref)
00000050
00000060 00000000002010f0 00000000002010ff (DW_OP_breg1 (rdx): 0; DW_OP_deref)
00000075 00000000002010ff 000000000020113c (DW_OP_breg7 (rsp): -32; DW_OP_deref; DW_OP_deref)
0000008b
0000009b 00000000002010f0 0000000000201112 (DW_OP_breg2 (rcx): 0; DW_OP_deref)
000000b0
000000c0 00000000002010f0 0000000000201104 (DW_OP_breg8 (r8): 0; DW_OP_deref)
000000d5 0000000000201104 000000000020113c (DW_OP_breg7 (rsp): -40; DW_OP_deref; DW_OP_deref)
000000eb

On analzsing the stack and memory using content of location list, it seems arguments are their but location list description incorrect.

Can anybody help me with this.

Thanks in anticipation!
Sourabh Singh Tomar