linux-kernel - Re: [PATCH 06/17] tools lib symbol: Skip non-address kallsyms line

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Date:   Tue, 6 Feb 2018 16:07:53 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 06/17] tools lib symbol: Skip non-address kallsyms line

Em Tue, Feb 06, 2018 at 04:06:49PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Feb 06, 2018 at 07:18:02PM +0100, Jiri Olsa escreveu:
> > Adding check on failed attempt to parse the address
> > and skip the line parsing early in that case.
> 
> How did you stumble on that? Can you provide an example of a line or
> situation where this would happen?

Something like this:

[acme@...et perf]$ cat /proc/kallsyms  | head
          (null) A irq_stack_union
          (null) A __per_cpu_start
          (null) A cpu_debug_store
          (null) A cpu_tss_rw
          (null) A gdt_page
          (null) A exception_stacks
          (null) A entry_stack_storage
          (null) A espfix_waddr
          (null) A espfix_stack
          (null) A cpu_llc_id
[acme@...et perf]$ id
uid=1000(acme) gid=1000(acme) groups=1000(acme),10(wheel),18(dialout),54(lock) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
[acme@...et perf]$

?

- Arnaldo