singlefilehost - filenames and line numbers are missing even when PDB is available

[am11]

Repro

# using latest net5 build on linux-musl x64

$ dotnet --version
5.0.300-preview.21215.17
$ dotnet-sos --version
5.0.217401+e11fe8401a6c8b67dbfe086acef2a75e1b327e04

# create and publish a singlefile app that throws
$ dotnet new console -n app1; cd app1
$ cat > Program.cs <<EOF
using System;
class Program
{
    static void Main() => throw new Exception("foo");
}
EOF
$  dotnet publish -c Debug -r linux-musl-x64 -p:'SelfContained=true;PublishSingleFile=true'

# debug with lldb
$ cd bin/Debug/net6.0/linux-musl-x64/publish
$ lldb ./app1
(lldb) target create "app1"
Current executable set to '/home/am11/projects/app1/bin/Debug/net5.0/linux-musl-x64/publish/app1' (x86_64).
(lldb) r
Process 2672 launched: '/home/am11/projects/app1/bin/Debug/net5.0/linux-musl-x64/publish/app1' (x86_64)
Unhandled exception. System.Exception: foo
   at Program.Main()
Process 2672 stopped
* thread #1, name = 'app1', stop reason = signal SIGABRT
    frame #0: 0x00007ffff7fada71 ld-musl-x86_64.so.1`__setjmp + 119
ld-musl-x86_64.so.1`__setjmp:
->  0x7ffff7fada71 <+119>: retq

ld-musl-x86_64.so.1`getitimer:
    0x7ffff7fada72 <+0>:   movslq %edi, %rdi
    0x7ffff7fada75 <+3>:   pushq  %rax
    0x7ffff7fada76 <+4>:   movl   $0x24, %eax
(lldb) clrstack
OS Thread Id: 0xa70 (1)
        Child SP               IP Call Site
00007FFFFFFFD670 00007ffff7fada71 [HelperMethodFrame: 00007fffffffd670]
00007FFFFFFFD7E0 00005554DC3D5869 Program.Main()

Expected

Filename and line number are shown in singlefile, as it does in non-singlefile case; since we have app1.pdb sitting right next to app1 in the current directory and it is a Debug configuration.
e.g.

--- actual
+++ expected

-   at Program.Main()
+   at Program.Main() in /home/am11/projects/app1/Program.cs:line 4

[mikem8361]

The workaround for now is to add the path the PDB is in with setsymbolserver -directory /home/am11/projects/app1/bin/Debug/net5.0/linux-musl-x64/publish. I need to think about if adding the "exe" path automatically to the symbol search path will have other problems.

[am11]

@mikem8361, thanks. With setsymbolserver file/line info shows up with clrstack:

(lldb) clrstack
OS Thread Id: 0x34 (1)
        Child SP               IP Call Site
00007FFFFFFFD670 00007ffff7fada71 [HelperMethodFrame: 00007fffffffd670]
00007FFFFFFFD7E0 00005554DC3C5869 Program.Main() [/home/am11/projects/app1/Program.cs @ 4]

however, not when exception is thrown (after run):

Unhandled exception. System.Exception: foo
   at Program.Main()

with non-singlefile (dotnet run or /home/am11/projects/app1/bin/Debug/net5.0/app1), it will show: at Program.Main() in /home/am11/projects/app1/Program.cs:line 4. Is this something that can be aligned too?

[mikem8361]

That looks like a runtime issue when printing out the stack trace. Could you file another issue in the runtime repo and assign it to me.

Both the SOS and runtime issues are because the modules are considered "InMemory" assemblies and that changes the logic in the SOS symbol support (and probably the runtime code) that ends up with this issue. I think I have a fix for the SOS issue.