/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-06 22:47:00,058 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:47:00,063 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:47:00,120 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-11-06 22:47:00,151 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-06 22:47:00,155 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-06 22:47:00,157 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-06 22:47:00,159 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-06 22:47:00,160 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-06 22:47:00,164 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-06 22:47:00,172 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-06 22:47:00,181 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-06 22:47:00,183 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-06 22:47:00,185 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-06 22:47:00,186 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-06 22:47:00,189 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-06 22:47:00,211 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-06 22:47:00,225 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:47:00,226 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:47:00,227 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:47:00,228 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-06 22:47:00,284 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:47:00,285 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:47:00,289 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:47:00,290 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:47:00,290 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:47:00,290 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:47:00,290 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:47:00,291 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:47:00,291 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:47:00,291 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:47:00,293 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:47:00,293 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:47:00,293 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:47:00,293 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:47:00,294 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:47:00,294 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:47:00,294 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:47:00,294 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:47:00,295 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:47:00,295 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:47:00,295 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:47:00,296 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:47:00,296 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:47:00,296 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:47:00,296 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:47:00,297 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:47:00,297 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:47:00,297 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:47:00,297 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:47:00,298 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:47:00,691 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:47:00,720 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:47:00,723 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:47:00,725 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:47:00,726 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:47:00,727 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt5.c [2020-11-06 22:47:00,812 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9b79bc061/48ca36b7ba544745b3106555d7de3278/FLAG8244761da [2020-11-06 22:47:01,386 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:47:01,387 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt5.c [2020-11-06 22:47:01,395 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9b79bc061/48ca36b7ba544745b3106555d7de3278/FLAG8244761da [2020-11-06 22:47:01,800 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9b79bc061/48ca36b7ba544745b3106555d7de3278 [2020-11-06 22:47:01,804 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:47:01,814 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:47:01,819 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:47:01,820 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:47:01,829 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:47:01,832 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:47:01" (1/1) ... [2020-11-06 22:47:01,839 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ebf996b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:47:01, skipping insertion in model container [2020-11-06 22:47:01,839 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:47:01" (1/1) ... [2020-11-06 22:47:01,848 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:47:01,867 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:47:02,086 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:47:02,097 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:47:02,119 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:47:02,137 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:47:02,138 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:47:02 WrapperNode [2020-11-06 22:47:02,138 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:47:02,139 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:47:02,139 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:47:02,140 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:47:02,155 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:47:02" (1/1) ... [2020-11-06 22:47:02,155 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:47:02" (1/1) ... [2020-11-06 22:47:02,162 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:47:02" (1/1) ... [2020-11-06 22:47:02,163 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:47:02" (1/1) ... [2020-11-06 22:47:02,170 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:47:02" (1/1) ... [2020-11-06 22:47:02,175 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:47:02" (1/1) ... [2020-11-06 22:47:02,176 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:47:02" (1/1) ... [2020-11-06 22:47:02,179 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:47:02,180 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:47:02,180 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:47:02,180 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:47:02,181 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:47:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:47:02,261 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:47:02,262 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:47:02,262 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:47:02,262 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-11-06 22:47:02,262 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-11-06 22:47:02,262 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:47:02,263 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:47:02,263 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:47:02,263 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:47:02,264 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:47:02,264 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-11-06 22:47:02,264 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-11-06 22:47:02,264 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-06 22:47:02,265 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:47:02,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:47:02,265 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:47:02,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:47:02,265 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:47:02,266 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:47:02,266 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:47:02,628 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:47:02,628 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-11-06 22:47:02,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:47:02 BoogieIcfgContainer [2020-11-06 22:47:02,630 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:47:02,632 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:47:02,633 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:47:02,636 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:47:02,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:47:01" (1/3) ... [2020-11-06 22:47:02,637 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b52e042 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:47:02, skipping insertion in model container [2020-11-06 22:47:02,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:47:02" (2/3) ... [2020-11-06 22:47:02,638 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b52e042 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:47:02, skipping insertion in model container [2020-11-06 22:47:02,638 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:47:02" (3/3) ... [2020-11-06 22:47:02,640 INFO L111 eAbstractionObserver]: Analyzing ICFG sumt5.c [2020-11-06 22:47:02,657 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:47:02,661 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:47:02,675 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:47:02,704 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:47:02,705 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:47:02,705 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:47:02,705 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:47:02,705 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:47:02,705 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:47:02,706 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:47:02,706 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:47:02,724 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-11-06 22:47:02,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-06 22:47:02,731 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:47:02,732 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:47:02,733 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:47:02,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:47:02,740 INFO L82 PathProgramCache]: Analyzing trace with hash -362830247, now seen corresponding path program 1 times [2020-11-06 22:47:02,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:47:02,751 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734309510] [2020-11-06 22:47:02,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:47:02,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:03,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:47:03,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:03,046 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:03,047 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734309510] [2020-11-06 22:47:03,048 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:47:03,048 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-06 22:47:03,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883984907] [2020-11-06 22:47:03,054 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-06 22:47:03,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:47:03,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-06 22:47:03,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-06 22:47:03,073 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-11-06 22:47:03,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:47:03,176 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-11-06 22:47:03,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-06 22:47:03,179 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-11-06 22:47:03,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:47:03,189 INFO L225 Difference]: With dead ends: 42 [2020-11-06 22:47:03,189 INFO L226 Difference]: Without dead ends: 19 [2020-11-06 22:47:03,193 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-06 22:47:03,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-11-06 22:47:03,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-11-06 22:47:03,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-11-06 22:47:03,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2020-11-06 22:47:03,238 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 13 [2020-11-06 22:47:03,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:47:03,239 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2020-11-06 22:47:03,239 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-06 22:47:03,239 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2020-11-06 22:47:03,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-06 22:47:03,240 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:47:03,240 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:47:03,241 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-06 22:47:03,241 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:47:03,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:47:03,242 INFO L82 PathProgramCache]: Analyzing trace with hash -1107188173, now seen corresponding path program 1 times [2020-11-06 22:47:03,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:47:03,243 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491778252] [2020-11-06 22:47:03,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:47:03,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:03,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:47:03,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:03,556 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:03,556 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491778252] [2020-11-06 22:47:03,557 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:47:03,557 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:47:03,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143618983] [2020-11-06 22:47:03,559 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:47:03,559 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:47:03,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:47:03,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:47:03,561 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand 6 states. [2020-11-06 22:47:03,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:47:03,849 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2020-11-06 22:47:03,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:47:03,850 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-11-06 22:47:03,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:47:03,851 INFO L225 Difference]: With dead ends: 36 [2020-11-06 22:47:03,851 INFO L226 Difference]: Without dead ends: 21 [2020-11-06 22:47:03,853 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:47:03,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-11-06 22:47:03,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-11-06 22:47:03,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-11-06 22:47:03,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-11-06 22:47:03,862 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-11-06 22:47:03,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:47:03,863 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-11-06 22:47:03,863 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:47:03,863 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-11-06 22:47:03,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-06 22:47:03,864 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:47:03,864 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:47:03,864 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-06 22:47:03,865 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:47:03,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:47:03,866 INFO L82 PathProgramCache]: Analyzing trace with hash -1577959002, now seen corresponding path program 1 times [2020-11-06 22:47:03,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:47:03,866 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920032671] [2020-11-06 22:47:03,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:47:03,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:04,369 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 37 [2020-11-06 22:47:04,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:47:04,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:04,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:04,585 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920032671] [2020-11-06 22:47:04,586 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959607173] [2020-11-06 22:47:04,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:47:04,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:04,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-06 22:47:04,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:47:04,887 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-11-06 22:47:04,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:04,952 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:47:04,952 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 17 [2020-11-06 22:47:04,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485421945] [2020-11-06 22:47:04,953 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-06 22:47:04,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:47:04,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-06 22:47:04,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2020-11-06 22:47:04,955 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 17 states. [2020-11-06 22:47:05,263 WARN L194 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 57 [2020-11-06 22:47:05,634 WARN L194 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-11-06 22:47:05,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:47:05,797 INFO L93 Difference]: Finished difference Result 42 states and 55 transitions. [2020-11-06 22:47:05,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-06 22:47:05,798 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2020-11-06 22:47:05,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:47:05,799 INFO L225 Difference]: With dead ends: 42 [2020-11-06 22:47:05,799 INFO L226 Difference]: Without dead ends: 27 [2020-11-06 22:47:05,800 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-11-06 22:47:05,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-11-06 22:47:05,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-11-06 22:47:05,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-11-06 22:47:05,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-11-06 22:47:05,808 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 16 [2020-11-06 22:47:05,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:47:05,809 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-11-06 22:47:05,809 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-06 22:47:05,809 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-11-06 22:47:05,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-06 22:47:05,810 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:47:05,810 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:47:06,024 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-06 22:47:06,025 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:47:06,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:47:06,026 INFO L82 PathProgramCache]: Analyzing trace with hash -466118030, now seen corresponding path program 1 times [2020-11-06 22:47:06,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:47:06,027 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424403126] [2020-11-06 22:47:06,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:47:06,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:06,785 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-06 22:47:06,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:47:06,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:07,051 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:07,051 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424403126] [2020-11-06 22:47:07,052 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475540417] [2020-11-06 22:47:07,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:47:07,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:07,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 26 conjunts are in the unsatisfiable core [2020-11-06 22:47:07,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:47:07,927 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-11-06 22:47:08,429 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-06 22:47:08,551 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:08,552 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:47:08,552 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 20 [2020-11-06 22:47:08,553 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606515562] [2020-11-06 22:47:08,553 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-11-06 22:47:08,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:47:08,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-11-06 22:47:08,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2020-11-06 22:47:08,555 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 20 states. [2020-11-06 22:47:08,778 WARN L194 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-06 22:47:09,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:47:09,727 INFO L93 Difference]: Finished difference Result 48 states and 61 transitions. [2020-11-06 22:47:09,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-06 22:47:09,728 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 22 [2020-11-06 22:47:09,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:47:09,729 INFO L225 Difference]: With dead ends: 48 [2020-11-06 22:47:09,730 INFO L226 Difference]: Without dead ends: 33 [2020-11-06 22:47:09,731 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 14 SyntacticMatches, 4 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=137, Invalid=675, Unknown=0, NotChecked=0, Total=812 [2020-11-06 22:47:09,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-11-06 22:47:09,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-11-06 22:47:09,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-11-06 22:47:09,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-11-06 22:47:09,739 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 22 [2020-11-06 22:47:09,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:47:09,740 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-11-06 22:47:09,740 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-11-06 22:47:09,740 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-11-06 22:47:09,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-06 22:47:09,741 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:47:09,741 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:47:09,954 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:47:09,955 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:47:09,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:47:09,957 INFO L82 PathProgramCache]: Analyzing trace with hash 449826944, now seen corresponding path program 1 times [2020-11-06 22:47:09,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:47:09,958 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394961370] [2020-11-06 22:47:09,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:47:10,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:10,550 WARN L194 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 35 [2020-11-06 22:47:10,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:47:10,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:10,768 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:10,769 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394961370] [2020-11-06 22:47:10,770 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277678142] [2020-11-06 22:47:10,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:47:10,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:10,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 30 conjunts are in the unsatisfiable core [2020-11-06 22:47:10,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:47:11,284 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-06 22:47:11,382 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:11,383 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:47:11,383 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 23 [2020-11-06 22:47:11,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986633384] [2020-11-06 22:47:11,384 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-06 22:47:11,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:47:11,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-06 22:47:11,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2020-11-06 22:47:11,386 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 23 states. [2020-11-06 22:47:11,903 WARN L194 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 59 [2020-11-06 22:47:12,141 WARN L194 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 61 [2020-11-06 22:47:12,325 WARN L194 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 58 [2020-11-06 22:47:12,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:47:12,958 INFO L93 Difference]: Finished difference Result 53 states and 65 transitions. [2020-11-06 22:47:12,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-06 22:47:12,959 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 28 [2020-11-06 22:47:12,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:47:12,960 INFO L225 Difference]: With dead ends: 53 [2020-11-06 22:47:12,960 INFO L226 Difference]: Without dead ends: 38 [2020-11-06 22:47:12,961 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=145, Invalid=977, Unknown=0, NotChecked=0, Total=1122 [2020-11-06 22:47:12,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-06 22:47:12,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-11-06 22:47:12,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-11-06 22:47:12,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-11-06 22:47:12,970 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 28 [2020-11-06 22:47:12,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:47:12,971 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-11-06 22:47:12,971 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-06 22:47:12,971 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-11-06 22:47:12,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-11-06 22:47:12,972 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:47:12,972 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:47:13,186 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:47:13,187 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:47:13,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:47:13,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1624955948, now seen corresponding path program 1 times [2020-11-06 22:47:13,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:47:13,189 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121166438] [2020-11-06 22:47:13,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:47:13,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:13,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:47:13,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:13,958 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:13,959 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121166438] [2020-11-06 22:47:13,959 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803588206] [2020-11-06 22:47:13,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:47:14,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:14,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 34 conjunts are in the unsatisfiable core [2020-11-06 22:47:14,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:47:14,600 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-06 22:47:14,676 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:14,677 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:47:14,677 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 27 [2020-11-06 22:47:14,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746653139] [2020-11-06 22:47:14,678 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-11-06 22:47:14,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:47:14,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-11-06 22:47:14,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-11-06 22:47:14,679 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 27 states. [2020-11-06 22:47:15,233 WARN L194 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 59 [2020-11-06 22:47:15,466 WARN L194 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 61 [2020-11-06 22:47:15,644 WARN L194 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 58 [2020-11-06 22:47:15,873 WARN L194 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 60 [2020-11-06 22:47:16,046 WARN L194 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 59 [2020-11-06 22:47:16,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:47:16,779 INFO L93 Difference]: Finished difference Result 57 states and 68 transitions. [2020-11-06 22:47:16,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-06 22:47:16,780 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 33 [2020-11-06 22:47:16,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:47:16,782 INFO L225 Difference]: With dead ends: 57 [2020-11-06 22:47:16,782 INFO L226 Difference]: Without dead ends: 42 [2020-11-06 22:47:16,784 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=177, Invalid=1383, Unknown=0, NotChecked=0, Total=1560 [2020-11-06 22:47:16,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-11-06 22:47:16,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-11-06 22:47:16,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-11-06 22:47:16,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2020-11-06 22:47:16,792 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 33 [2020-11-06 22:47:16,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:47:16,792 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2020-11-06 22:47:16,793 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-11-06 22:47:16,793 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2020-11-06 22:47:16,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-11-06 22:47:16,794 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:47:16,794 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:47:17,007 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:47:17,008 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:47:17,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:47:17,009 INFO L82 PathProgramCache]: Analyzing trace with hash 1048798439, now seen corresponding path program 1 times [2020-11-06 22:47:17,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:47:17,010 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587130899] [2020-11-06 22:47:17,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:47:17,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:18,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:47:18,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:18,279 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:18,280 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587130899] [2020-11-06 22:47:18,280 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819565658] [2020-11-06 22:47:18,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:47:18,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:18,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 38 conjunts are in the unsatisfiable core [2020-11-06 22:47:18,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:47:19,302 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-06 22:47:19,311 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-06 22:47:19,318 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-06 22:47:19,325 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-06 22:47:19,433 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:19,434 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:47:19,434 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17] total 33 [2020-11-06 22:47:19,434 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029243504] [2020-11-06 22:47:19,435 INFO L461 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-11-06 22:47:19,435 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:47:19,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-11-06 22:47:19,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=949, Unknown=0, NotChecked=0, Total=1056 [2020-11-06 22:47:19,436 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand 33 states. [2020-11-06 22:47:21,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:47:21,604 INFO L93 Difference]: Finished difference Result 60 states and 70 transitions. [2020-11-06 22:47:21,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-11-06 22:47:21,605 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 37 [2020-11-06 22:47:21,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:47:21,606 INFO L225 Difference]: With dead ends: 60 [2020-11-06 22:47:21,606 INFO L226 Difference]: Without dead ends: 45 [2020-11-06 22:47:21,608 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=242, Invalid=2014, Unknown=0, NotChecked=0, Total=2256 [2020-11-06 22:47:21,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-11-06 22:47:21,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-11-06 22:47:21,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-11-06 22:47:21,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-11-06 22:47:21,632 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 37 [2020-11-06 22:47:21,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:47:21,632 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-11-06 22:47:21,632 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-11-06 22:47:21,632 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-11-06 22:47:21,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-11-06 22:47:21,634 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:47:21,634 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:47:21,840 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-11-06 22:47:21,841 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:47:21,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:47:21,842 INFO L82 PathProgramCache]: Analyzing trace with hash 478254706, now seen corresponding path program 2 times [2020-11-06 22:47:21,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:47:21,843 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323760531] [2020-11-06 22:47:21,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:47:21,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:23,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:47:23,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:23,253 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:23,254 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323760531] [2020-11-06 22:47:23,254 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189700115] [2020-11-06 22:47:23,254 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:47:23,313 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:47:23,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:47:23,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 42 conjunts are in the unsatisfiable core [2020-11-06 22:47:23,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:47:24,689 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-06 22:47:24,708 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-06 22:47:24,717 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-06 22:47:24,722 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-06 22:47:24,883 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:24,884 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:47:24,884 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19] total 37 [2020-11-06 22:47:24,885 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679499222] [2020-11-06 22:47:24,891 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-11-06 22:47:24,891 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:47:24,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-11-06 22:47:24,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1214, Unknown=0, NotChecked=0, Total=1332 [2020-11-06 22:47:24,893 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 37 states. [2020-11-06 22:47:25,151 WARN L194 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-06 22:47:27,235 WARN L194 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 69 [2020-11-06 22:47:27,492 WARN L194 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 77 [2020-11-06 22:47:28,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:47:28,046 INFO L93 Difference]: Finished difference Result 65 states and 77 transitions. [2020-11-06 22:47:28,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-11-06 22:47:28,046 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 40 [2020-11-06 22:47:28,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:47:28,048 INFO L225 Difference]: With dead ends: 65 [2020-11-06 22:47:28,048 INFO L226 Difference]: Without dead ends: 50 [2020-11-06 22:47:28,051 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 24 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 623 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=281, Invalid=2689, Unknown=0, NotChecked=0, Total=2970 [2020-11-06 22:47:28,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-11-06 22:47:28,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-11-06 22:47:28,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-11-06 22:47:28,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2020-11-06 22:47:28,060 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 40 [2020-11-06 22:47:28,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:47:28,060 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2020-11-06 22:47:28,060 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-11-06 22:47:28,060 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2020-11-06 22:47:28,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-11-06 22:47:28,062 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:47:28,063 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:47:28,278 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:47:28,278 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:47:28,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:47:28,279 INFO L82 PathProgramCache]: Analyzing trace with hash -876919518, now seen corresponding path program 3 times [2020-11-06 22:47:28,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:47:28,279 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104165996] [2020-11-06 22:47:28,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:47:28,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:29,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:47:29,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:47:29,891 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:47:29,891 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104165996] [2020-11-06 22:47:29,891 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703752438] [2020-11-06 22:47:29,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true