Assertion violation at src/util/vector.h:405

[wintered]

[529] % z3 small.smt2
ASSERTION VIOLATION
File: ../src/util/vector.h
Line: 405
!empty()
(C)ontinue, (A)bort, (S)top, (T)hrow exception, Invoke (G)DB
a
[530] % z3release small.smt2
Segmentation fault
[531] % z3san small.smt2
ASAN:DEADLYSIGNAL
=================================================================
==28377==ERROR: AddressSanitizer: SEGV on unknown address 0x00017fff7fff (pc 0x55c7832168ed bp 0x7ffdd9dc97c0 sp 0x7ffdd9dc9720 T0)
==28377==The signal is caused by a READ memory access.
  #0 0x55c7832168ec in ref_vector_core<expr, ref_manager_wrapper<expr, ast_manager> >::back() const ../src/util/ref_vector.h:121
  #1 0x55c7832168ec in purify_arith_proc::rw_cfg::push_cnstr_pr(app*) ../src/tactic/arith/purify_arith_tactic.cpp:263
  #2 0x55c78322dff5 in purify_arith_proc::process_quantifier(quantifier*, obj_ref<expr, ast_manager>&, obj_ref<app, ast_manager>&) ../src/tactic/arith/purify_arith_tactic.cpp:742
  #3 0x55c78322ea90 in purify_arith_proc::rw_cfg::get_subst(expr*, expr*&, app*&) ../src/tactic/arith/purify_arith_tactic.cpp:696
  #4 0x55c78322ea90 in bool rewriter_tpl<purify_arith_proc::rw_cfg>::visit<true>(expr*, unsigned int) ../src/ast/rewriter/rewriter_def.h:140
  #5 0x55c783235074 in void rewriter_tpl<purify_arith_proc::rw_cfg>::main_loop<true>(expr*, obj_ref<expr, ast_manager>&, obj_ref<app, ast_manager>&) ../src/ast/rewriter/rewriter_def.h:715
  #6 0x55c78323a601 in rewriter_tpl<purify_arith_proc::rw_cfg>::operator()(expr*, obj_ref<expr, ast_manager>&, obj_ref<app, ast_manager>&) ../src/ast/rewriter/rewriter_def.h:798
  #7 0x55c78323a601 in purify_arith_proc::operator()(ref<model_converter>&, bool) ../src/tactic/arith/purify_arith_tactic.cpp:761
  #8 0x55c783240abd in purify_arith_tactic::operator()(ref<goal> const&, sref_buffer<goal, 16u>&) ../src/tactic/arith/purify_arith_tactic.cpp:908
  #9 0x55c783a72f61 in and_then_tactical::operator()(ref<goal> const&, sref_buffer<goal, 16u>&) ../src/tactic/tactical.cpp:111
  #10 0x55c783a73f57 in and_then_tactical::operator()(ref<goal> const&, sref_buffer<goal, 16u>&) ../src/tactic/tactical.cpp:120
  #11 0x55c783a73f57 in and_then_tactical::operator()(ref<goal> const&, sref_buffer<goal, 16u>&) ../src/tactic/tactical.cpp:120
  #12 0x55c7839d594a in exec(tactic&, ref<goal> const&, sref_buffer<goal, 16u>&) ../src/tactic/tactic.cpp:148
  #13 0x55c7839d7c4d in check_sat(tactic&, ref<goal>&, ref<model>&, labels_vec&, obj_ref<app, ast_manager>&, obj_ref<dependency_manager<ast_manager::expr_dependency_config>::dependency, ast_manager>&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&) ../src/tactic/tactic.cpp:168
  #14 0x55c783787cc0 in check_sat_using_tactict_cmd::execute(cmd_context&) ../src/cmd_context/tactic_cmds.cpp:223
  #15 0x55c7837172e8 in smt2::parser::parse_ext_cmd(int, int) ../src/parsers/smt2/smt2parser.cpp:2895
  #16 0x55c78371df5c in smt2::parser::parse_cmd() ../src/parsers/smt2/smt2parser.cpp:3001
  #17 0x55c78371df5c in smt2::parser::operator()() ../src/parsers/smt2/smt2parser.cpp:3130
  #18 0x55c7836d55f5 in parse_smt2_commands(cmd_context&, std::istream&, bool, params_ref const&, char const*) ../src/parsers/smt2/smt2parser.cpp:3179
  #19 0x55c780d671a6 in read_smtlib2_commands(char const*) ../src/shell/smtlib_frontend.cpp:89
  #20 0x55c780d3fa3e in main ../src/shell/main.cpp:352
  #21 0x7f858678eb96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
  #22 0x55c780d53819 in _start (/home/suz/software/z3san/build-04272020120633-8996e81/z3+0x1f7819)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV ../src/util/ref_vector.h:121 in ref_vector_core<expr, ref_manager_wrapper<expr, ast_manager> >::back() const
==28377==ABORTING
[532] % 
[532] % cat small.smt2
(set-option :proof true)
(declare-sort a)
(declare-fun f (a) a)
(assert (forall ((t a)) (= (f t) t)))
(check-sat-using purify-arith)
[533] %

OS: Ubuntu 18.04
Commit: 3a63c37