Wrong Perf Backtraces

Hi,
I used "Perf" to extract call graphs in an evince benchmark. The command 
used is as follows:
sudo perf record -d --call-graph dwarf -c 10000 e 
mem_load_uops_retired.l3_miss:uppp /opt/evince-3.28.4/bin/evince

I extracted the backtraces using "perf script" and found out that there 
are many corrupted backtrace instances. Some contained repeated function 
calls, for example two consecutive gmallocn()s exactly at the same 
offsets. There are also some backtraces where the callers and callees do 
not match.

Note that that mappings are correct. In other words, each single line of 
the reported backtraces is correct (i.e., addresses match with 
functions). But is seems that there are some function calls in the 
middle, which are missed by "Perf". Strangely, in all runs (and also 
with different sampling frequencies) the problem occurs exactly at the 
same place.

I am really confused and looking forward to any help. I can also send 
backtraces if needed.
Regards.