This is a general diagnostic improvement identified under issue #4669: having the DR library (or static exe for static linking) included in the callstack simplifies offline symbolization. Client library bases were already included.
Here is what the new output looks like, tested on client.timer with the prior #4669 fix from PR #4672 disabled so the curiosity showed up:
<CURIOSITY : tdcontext != ... version 8.0.18639, custom build -no_dynamic_options ... 0x00007fa69912a0a0 0x00007fa8dd273fa5 0x00007fa69912a1b0 0x00007fa8dd276688 0x00007fa69912b4c0 0x00007fa8dd2769fc 0x00007fa69912be10 0x00007fa8dd26f2ae 0x00007fa69912be50 0x00007fa8990742c0 0x00007fa69912be90 0x00007fa8dd366d63 0x00007fa69912c810 0x00007fa8dd35f3d2 0x00007fa69912c9b0 0x00007fa8dd31d034 0x00007ffdf0bb12b0 0x00007fa8dce7cd0a 0x00007fa8d906d6c0 0x5541d68949564100 /home/bruening/dr/git/build_x64_dbg_tests/lib64/debug/libdynamorio.so=0x00007fa8dd072000 /home/bruening/dr/git/build_x64_dbg_tests/suite/tests/bin/libclient.timer.dll.so=0x00007fa899073000>
Issue: #4669