Description of problem:
$ gdb -p 24082
GNU gdb (GDB) Fedora 8.1-15.fc29
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Attaching to process 24082
[New LWP 24089]
[New LWP 24091]
[New LWP 24092]
[New LWP 24096]
[New LWP 24098]
[New LWP 24099]
[New LWP 24100]
[New LWP 24101]
[New LWP 24132]
[New LWP 24133]
[New LWP 24134]
[New LWP 24135]
[New LWP 24136]
[New LWP 24137]
[New LWP 24138]
[New LWP 24147]
[New LWP 24747]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Missing separate debuginfo for /lib64/libharfbuzz-icu.so.0
Try: dnf --enablerepo='*debug*' install /usr/lib/debug/.build-id/7e/010586b65c53819984f41ba424ab17f8c627cf.debug
Missing separate debuginfo for /home/mikhail/Downloads/firefox/libssl3.so
Try: dnf --enablerepo='*debug*' install /usr/lib/debug/.build-id/21/dd9f989584c6a4d92499326fc65a3556589fb6.debug
Missing separate debuginfo for /home/mikhail/Downloads/firefox/libsmime3.so
Try: dnf --enablerepo='*debug*' install /usr/lib/debug/.build-id/6b/1c418a268cc17283ceb65fd14d6c71b3f52366.debug
Missing separate debuginfo for /home/mikhail/Downloads/firefox/libnss3.so
Try: dnf --enablerepo='*debug*' install /usr/lib/debug/.build-id/8b/5a66b46b2f4a427bd573c1dbcee330562de7af.debug
Missing separate debuginfo for /home/mikhail/Downloads/firefox/libnssutil3.so
Try: dnf --enablerepo='*debug*' install /usr/lib/debug/.build-id/bd/729a4805d245e058a30c50a5a8e69c518ee700.debug
Missing separate debuginfo for /home/mikhail/Downloads/firefox/libplds4.so
Try: dnf --enablerepo='*debug*' install /usr/lib/debug/.build-id/3a/2326d1fd4330a9cfb16a7f56c745b1c0b27015.debug
Missing separate debuginfo for /home/mikhail/Downloads/firefox/libplc4.so
Try: dnf --enablerepo='*debug*' install /usr/lib/debug/.build-id/48/15f6c0c159faff800353d09b237a09d529100b.debug
Missing separate debuginfo for /home/mikhail/Downloads/firefox/libnspr4.so
Try: dnf --enablerepo='*debug*' install /usr/lib/debug/.build-id/e0/a681cf90484daf17d396e466146a9ccd55bc64.debug
../../gdb/dictionary.c:690: internal-error: void insert_symbol_hashed(dictionary*, symbol*): Assertion `SYMBOL_LANGUAGE (sym) == DICT_LANGUAGE (dict)->la_language' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y

This is a bug, please report it.  For instructions, see:
<http://www.gnu.org/software/gdb/bugs/>.

../../gdb/dictionary.c:690: internal-error: void insert_symbol_hashed(dictionary*, symbol*): Assertion `SYMBOL_LANGUAGE (sym) == DICT_LANGUAGE (dict)->la_language' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) y

Aborted (core dum

Version-Release number of selected component:
gdb-headless-8.1-15.fc29

Additional info:
reporter:       libreport-2.9.5
backtrace_rating: 4
cmdline:        gdb -p 24082
crash_function: dump_core
executable:     /usr/libexec/gdb
journald_cursor: s=31b9e5f62f2a4f99ade9a8bc669666d1;i=98d80;b=afdffca5133646678334274db929bce4;m=31c87d7366;t=56db9bcd019bd;x=4fd3763309595993
kernel:         4.17.0-0.rc7.git1.1.fc29.x86_64
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #2 dump_core at ../../gdb/utils.c:291
 #3 internal_vproblem(internal_problem*, char const*, int, char const*, __va_list_tag*) at ../../gdb/utils.c:500
 #4 internal_verror at ../../gdb/utils.c:525
 #5 internal_error at ../../gdb/common/errors.c:55
 #6 insert_symbol_hashed at ../../gdb/dictionary.c:695
 #7 dict_create_hashed at ../../gdb/dictionary.c:382
 #8 finish_block_internal at ../../gdb/buildsym.c:366
 #9 finish_block at ../../gdb/buildsym.c:534
 #10 read_lexical_block_scope at ../../gdb/dwarf2read.c:13920
 #11 process_die(die_info*, dwarf2_cu*) at ../../gdb/dwarf2read.c:10657

Potential duplicate: bug 1579106