linux-kernel - Re: [PATCH 1/3] perf report: don't try to map ip to invalid map

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Date:   Thu, 27 Sep 2018 18:02:31 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Milian Wolff <milian.wolff@...b.com>
Cc:     acme@...nel.org, jolsa@...nel.org, yao.jin@...ux.intel.com,
        namhyung@...nel.org, Linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Sandipan Das <sandipan@...ux.ibm.com>
Subject: Re: [PATCH 1/3] perf report: don't try to map ip to invalid map

On Wed, Sep 26, 2018 at 03:52:05PM +0200, Milian Wolff wrote:
> Fixes a crash when the report encounters an address that
> could not be associated with an mmaped region:
> 
> #0  0x00005555557bdc4a in callchain_srcline (ip=<error reading variable: Cannot access memory at address 0x38>, sym=0x0, map=0x0) at util/machine.c:2329
> #1  unwind_entry (entry=entry@...ry=0x7fffffff9180, arg=arg@...ry=0x7ffff5642498) at util/machine.c:2329
> #2  0x00005555558370af in entry (arg=0x7ffff5642498, cb=0x5555557bdb50 <unwind_entry>, thread=<optimized out>, ip=18446744073709551615) at util/unwind-libunwind-local.c:586
> #3  get_entries (ui=ui@...ry=0x7fffffff9620, cb=0x5555557bdb50 <unwind_entry>, arg=0x7ffff5642498, max_stack=<optimized out>) at util/unwind-libunwind-local.c:703
> #4  0x0000555555837192 in _unwind__get_entries (cb=<optimized out>, arg=<optimized out>, thread=<optimized out>, data=<optimized out>, max_stack=<optimized out>) at util/unwind-libunwind-local.c:725
> #5  0x00005555557c310f in thread__resolve_callchain_unwind (max_stack=127, sample=0x7fffffff9830, evsel=0x555555c7b3b0, cursor=0x7ffff5642498, thread=0x555555c7f6f0) at util/machine.c:2351
> #6  thread__resolve_callchain (thread=0x555555c7f6f0, cursor=0x7ffff5642498, evsel=0x555555c7b3b0, sample=0x7fffffff9830, parent=0x7fffffff97b8, root_al=0x7fffffff9750, max_stack=127) at util/machine.c:2378
> #7  0x00005555557ba4ee in sample__resolve_callchain (sample=<optimized out>, cursor=<optimized out>, parent=parent@...ry=0x7fffffff97b8, evsel=<optimized out>, al=al@...ry=0x7fffffff9750,
>     max_stack=<optimized out>) at util/callchain.c:1085
> 
> Signed-off-by: Milian Wolff <milian.wolff@...b.com>
> Cc: Sandipan Das <sandipan@...ux.ibm.com>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka