[Bug gdb/21623] New: add-symbol-file not loading symbols at the provided .text offset

["krkhan at inspirated dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21623

            Bug ID: 21623
           Summary: add-symbol-file not loading symbols at the provided
                    .text offset
           Product: gdb
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: krkhan at inspirated dot com
  Target Milestone: ---

On a guest VM:

> # cat /sys/module/dm_crypt/sections/{.text,.data}
> 0xffffffffa049f000
> 0xffffffffa04a4000

Debugger:

> (gdb) add-symbol-file drivers/md/dm-crypt.ko 0xffffffffa049f000 -s .data 0xffffffffa04a4000
> add symbol table from file "drivers/md/dm-crypt.ko" at
>         .text_addr = 0xffffffffa049f000
>         .data_addr = 0xffffffffa04a4000
> (y or n) y
> Reading symbols from drivers/md/dm-crypt.ko...done.
> (gdb) p crypt_target.version
> $1 = {1, 15, 0}
> (gdb) info addr crypt_target
> Symbol "crypt_target" is static storage at address 0xffffffffa04a4020.
> (gdb) info addr dm_crypt_exit
> Symbol "dm_crypt_exit" is a function at address 0x4e.
> (gdb) b dm_crypt_exit
> Cannot access memory at address 0x4e

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