Re: [lmi] perf

[Vadim Zeitlin]

On Tue, 29 Sep 2020 16:33:20 +0000 Greg Chicares <gchicares@sbcglobal.net> 
wrote:

GC> On 2020-09-29 11:22, Vadim Zeitlin wrote:
GC> > On Tue, 29 Sep 2020 08:51:38 +0000 Greg Chicares 
<gchicares@sbcglobal.net> wrote:
GC> [...]
GC> > GC> >  If you do have the symbols, at the very least you would be able to 
decode
GC> > GC> > the address manually using "addr2line -f -e 
/lib/x86_64-linux-gnu/libm.so".
GC> > GC> 
GC> > GC> addr2line: /lib/x86_64-linux-gnu/libm.so: file format not recognized
GC> > 
GC> >  Hmm, what is this file? It could be a linker script, I guess. I should
GC> > have written libm-2.29.so in full.
GC> 
GC> /opt/lmi/src/lmi[0]$file /lib/x86_64-linux-gnu/libm.so
GC> /lib/x86_64-linux-gnu/libm.so: ASCII text
GC> /opt/lmi/src/lmi[0]$cat /lib/x86_64-linux-gnu/libm.so
GC> /* GNU ld script
GC> */
GC> OUTPUT_FORMAT(elf64-x86-64)
GC> GROUP ( /lib/x86_64-linux-gnu/libm.so.6  AS_NEEDED ( 
/usr/lib/x86_64-linux-gnu/libmvec_nonshared.a 
/lib/x86_64-linux-gnu/libmvec.so.1 ) )

 OK, so it is a linker script. The real library is libm.so.6.

GC> Trying it anyway, without installing a debug-symbols package,
GC> it seemed to freeze, so I hit Enter a couple times before Ctrl-C:

 Oh, sorry, I feel really stupid, but I should have mentioned that add2line
takes the address you want to map either as command line argument or from
stdin. I.e. you should have given it 0x000000000001b1c9 (it does understand
hex) as the last argument -- I was just too lazy to type this one.

GC> But right now I'm trapped in a morass of dependencies.
[...]

 Yes, we definitely should do something to get you out of it quickly. I
still haven't really started on lib{xml2,xslt} submodules, but I'll do this
right now (well, after answering your other email).

 Sorry again for the delay,
VZ

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