With debuginfo installed the backtace contains the swapcontext.S
source file. Filter that out, like the clone.S source file is in
drd/tests/filter_stderr.
-e "s/(tc20_verifywrap.c:261)/(tc20_verifywrap.c:262)/" \
-e "/^Copyright (C) 2006-20.., and GNU GPL'd, by Bart Van Assche.$/d" \
-e "s/\([A-Za-z_]*\) (clone.S:[0-9]*)/\1 (in \/...libc...)/" \
+-e "s/\([A-Za-z_]*\) (swapcontext.S:[0-9]*)/\1 (in \/...libc...)/" \
-e "s/[A-Za-z_]* (pthread_create.c:[0-9]*)/(within libpthread-?.?.so)/" \
-e "s/[A-Za-z_]* (in [^ ]*libpthread-[0-9.]*\.so)/(within libpthread-?.?.so)/" \
-e "s:(within /lib[0-9]*/ld-[0-9.]*\.so):(within ld-?.?.so):" \