get_name used on incorrect input crashes Julia

[Gyoshi]

The following crashes Julia (version 1.3.1 (2019-12-30)) on my machine.

using SymEngine
@vars x
@funs f
get_name(diff(f(x), x)) # not using `get_name` correctly, I know

with the following error message

Please submit a bug report with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x7ffb82cc49e0 -- memcpy at C:\WINDOWS\System32\msvcrt.dll (unknown line)
in expression starting at none:0
memcpy at C:\WINDOWS\System32\msvcrt.dll (unknown line)
_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_M_constructIPcEEvT_S7_St20forward_iterator_tag.isra.492 at C:\Users\Johannes\.julia\artifacts\9bfc40fb727d9f2c01da7590b6edf5d4d27f7275\bin\libsymengine-0.6.dll (unknown line)
function_symbol_get_name at C:\Users\Johannes\.julia\artifacts\9bfc40fb727d9f2c01da7590b6edf5d4d27f7275\bin\libsymengine-0.6.dll (unknown line)
get_name at C:\Users\Johannes\.julia\packages\SymEngine\lLmHe\src\types.jl:260
_jl_invoke at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\gf.c:2141 [inlined]
jl_apply_generic at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\gf.c:2305
jl_apply at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\julia.h:1631 [inlined]
do_call at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\interpreter.c:328
eval_value at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\interpreter.c:417
eval_stmt_value at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\interpreter.c:368 [inlined]
eval_body at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\interpreter.c:764
jl_interpret_toplevel_thunk_callback at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\interpreter.c:888
unknown function (ip: FFFFFFFFFFFFFFFE)
unknown function (ip: 000000002BB0330F)
unknown function (ip: 0000000000000001)
jl_toplevel_eval_flex at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\toplevel.c:814
jl_toplevel_eval at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\toplevel.c:823 [inlined]
jl_toplevel_eval_in at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\toplevel.c:843
eval at .\boot.jl:330 [inlined]
repleval at C:\Users\Johannes\.julia\packages\Atom\9h5Up\src\repl.jl:196
_jl_invoke at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\gf.c:2135 [inlined]
jl_apply_generic at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\gf.c:2305
#246 at C:\Users\Johannes\.julia\packages\Atom\9h5Up\src\repl.jl:223
with_logstate at .\logging.jl:395
with_logger at .\logging.jl:491 [inlined]
evalrepl at C:\Users\Johannes\.julia\packages\Atom\9h5Up\src\repl.jl:214
_jl_invoke at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\gf.c:2135 [inlined]
jl_apply_generic at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\gf.c:2305
jl_apply at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\julia.h:1631 [inlined]
do_call at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\interpreter.c:328
eval_value at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\interpreter.c:417
eval_stmt_value at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\interpreter.c:368 [inlined]
eval_body at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\interpreter.c:764
jl_interpret_toplevel_thunk_callback at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\interpreter.c:888
unknown function (ip: FFFFFFFFFFFFFFFE)
unknown function (ip: 000000002BB0320F)
unknown function (ip: FFFFFFFFFFFFFFFF)
jl_toplevel_eval_flex at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\toplevel.c:814
jl_toplevel_eval at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\toplevel.c:823 [inlined]
jl_toplevel_eval_in at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\toplevel.c:843
eval at .\boot.jl:330
_jl_invoke at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\gf.c:2135 [inlined]
jl_apply_generic at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\gf.c:2305
eval_user_input at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.3\REPL\src\REPL.jl:86
macro expansion at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.3\REPL\src\REPL.jl:118 [inlined]
#26 at .\task.jl:333
_jl_invoke at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\gf.c:2135 [inlined]
jl_apply_generic at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\gf.c:2305
jl_apply at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\julia.h:1631 [inlined]
start_task at /cygdrive/d/buildbot/worker/package_win64/build/src/cygdrive/d/buildbot/worker/package_win64/build/src\task.c:659
Allocations: 47877685 (Pool: 47869096; Big: 8589); GC: 41

[Myrddinlefou]

I have the same problem :
JuliaLang/julia#37770 (comment)