[Bug runtime/17921] New: kernel backtrace missing /proc/kallsyms symbols

["brendan.d.gregg at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17921

            Bug ID: 17921
           Summary: kernel backtrace missing /proc/kallsyms symbols
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: brendan.d.gregg at gmail dot com

Profiling kernel stack traces shows hex addresses:

# stap --all-modules -ve 'global s; probe timer.profile { s[backtrace()] <<< 1;
} probe end { foreach (i in s+) { print_stack(i); printf("\t%d\n",
@count(s[i])); } }'
Pass 1: parsed user script and 102 library script(s) using
152856virt/28460res/2156shr/27052data kb, in 140usr/30sys/165real ms.
Pass 2: analyzed script: 2 probe(s), 6 function(s), 4 embed(s), 1 global(s)
using 154056virt/30500res/2972shr/28252data kb, in 10usr/110sys/125real ms.
WARNING: missing unwind/symbol data for module 'kernel'
Pass 3: translated to C into
"/tmp/staprDrjyS/stap_ad1e5b386c49b6c6eb4d3be0af23f502_4294_src.c" using
154172virt/31012res/3348shr/28368data kb, in 140usr/110sys/537real ms.
Pass 4: compiled C into "stap_ad1e5b386c49b6c6eb4d3be0af23f502_4294.ko" in
1850usr/740sys/2511real ms.
Pass 5: starting run.
 ^C 0xffffffff810013aa : 0xffffffff810013aa
 0xffffffff8100a190 : 0xffffffff8100a190
 0xffffffff8101e39d : 0xffffffff8101e39d
 0xffffffff8101dc59 : 0xffffffff8101dc59
 0xffffffff8100a979 : 0xffffffff8100a979
 0xffffffff815841c9 : 0xffffffff815841c9
    250
 0xffffffff810013aa : 0xffffffff810013aa
 0xffffffff8100a190 : 0xffffffff8100a190
 0xffffffff8101e39d : 0xffffffff8101e39d
 0xffffffff8101dc59 : 0xffffffff8101dc59
 0xffffffff8157f825 : 0xffffffff8157f825
 0xffffffff819d1f28 : 0xffffffff819d1f28
 0xffffffff819d1964 : 0xffffffff819d1964
 0xffffffff819d1356 : 0xffffffff819d1356
 0xffffffff819d528b : 0xffffffff819d528b
    466
# stap -V
Systemtap translator/driver (version 2.6/0.152, commit
release-2.5-197-gcf88ea804213)
Copyright (C) 2005-2014 Red Hat, Inc. and others
This is free software; see the source for copying conditions.enabled features:
TR1_UNORDERED_MAP NLS

This system does not have kernel debuginfo. However, the symbols printed can be
found in /proc/kallsyms, such that I can do some human (or scripted)
post-translation of this output. SystemTap should use /proc/kallsyms
translation, when dwarf unwind is unavailable.

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