[Bug runtime/25853] Stap's own dwarf-based stack unwinder does not give very accurate kernel backtraces

[agentzh at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25853

--- Comment #1 from agentzh <agentzh at gmail dot com> ---
Adding the '-d kernel' option is not very helpful when the kernel debuginfo is
missing in the system:

```
$ /opt/stap/bin/stap -d kernel -e 'probe oneshot { print_backtrace() }'
 0xffffffffc123c8cb [stap_e4014a9c5a0decc7f01b4bb37a893a9_29973+0x88cb/0x0]
 0xffffffffc123c84a [stap_e4014a9c5a0decc7f01b4bb37a893a9_29973+0x884a/0x0]
(inexact)
```

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