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 16:11:53 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Sandipan Das <sandipan@...ux.ibm.com>
Cc:     Milian Wolff <milian.wolff@...b.com>, jolsa@...nel.org,
        yao.jin@...ux.intel.com, namhyung@...nel.org,
        Linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/3] perf report: don't try to map ip to invalid map

Em Thu, Sep 27, 2018 at 02:18:47PM +0530, Sandipan Das escreveu:
> 
> 
> On 26/09/18 7:22 PM, 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
> > 
> 
> Tested-by: Sandipan Das <sandipan@...ux.ibm.com>

Thanks, applied.

- Arnaldo