/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 05:01:53,126 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 05:01:53,128 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 05:01:53,159 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 05:01:53,159 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 05:01:53,161 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 05:01:53,163 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 05:01:53,167 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 05:01:53,169 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 05:01:53,172 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 05:01:53,173 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 05:01:53,174 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 05:01:53,174 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 05:01:53,175 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 05:01:53,176 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 05:01:53,177 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 05:01:53,179 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 05:01:53,179 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 05:01:53,181 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 05:01:53,185 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 05:01:53,186 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 05:01:53,187 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 05:01:53,188 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 05:01:53,189 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 05:01:53,194 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-06 05:01:53,194 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-06 05:01:53,194 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-06 05:01:53,195 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-06 05:01:53,195 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-06 05:01:53,196 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-06 05:01:53,196 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-06 05:01:53,197 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-06 05:01:53,198 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-06 05:01:53,198 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-06 05:01:53,199 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-06 05:01:53,199 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-06 05:01:53,200 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-06 05:01:53,200 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-06 05:01:53,200 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 05:01:53,202 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 05:01:53,202 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 05:01:53,205 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 [2021-05-06 05:01:53,250 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 05:01:53,251 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 05:01:53,253 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 05:01:53,253 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 05:01:53,253 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 05:01:53,253 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 05:01:53,253 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 05:01:53,253 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 05:01:53,253 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 05:01:53,254 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 05:01:53,254 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 05:01:53,254 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 05:01:53,255 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 05:01:53,255 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 05:01:53,255 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 05:01:53,255 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 05:01:53,255 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 05:01:53,255 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 05:01:53,255 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 05:01:53,255 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 05:01:53,256 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 05:01:53,256 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 05:01:53,256 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 05:01:53,256 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 05:01:53,256 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 05:01:53,256 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 05:01:53,256 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 05:01:53,256 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 05:01:53,256 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 05:01:53,561 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 05:01:53,575 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 05:01:53,577 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 05:01:53,577 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 05:01:53,578 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 05:01:53,578 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_unwindbound20.c [2021-05-06 05:01:53,620 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8dd4e0f31/63cf13b0616f4a5797d6239c0852f5cb/FLAG8c3a60833 [2021-05-06 05:01:54,032 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 05:01:54,032 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_unwindbound20.c [2021-05-06 05:01:54,037 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8dd4e0f31/63cf13b0616f4a5797d6239c0852f5cb/FLAG8c3a60833 [2021-05-06 05:01:54,448 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8dd4e0f31/63cf13b0616f4a5797d6239c0852f5cb [2021-05-06 05:01:54,450 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 05:01:54,451 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 05:01:54,452 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 05:01:54,452 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 05:01:54,454 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 05:01:54,455 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:01:54" (1/1) ... [2021-05-06 05:01:54,455 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72ea8e44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:01:54, skipping insertion in model container [2021-05-06 05:01:54,456 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:01:54" (1/1) ... [2021-05-06 05:01:54,460 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 05:01:54,469 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 05:01:54,548 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_unwindbound20.c[458,471] [2021-05-06 05:01:54,558 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:01:54,563 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 05:01:54,612 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_unwindbound20.c[458,471] [2021-05-06 05:01:54,641 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:01:54,650 INFO L208 MainTranslator]: Completed translation [2021-05-06 05:01:54,651 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:01:54 WrapperNode [2021-05-06 05:01:54,651 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 05:01:54,652 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 05:01:54,652 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 05:01:54,652 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 05:01:54,659 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:01:54" (1/1) ... [2021-05-06 05:01:54,660 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:01:54" (1/1) ... [2021-05-06 05:01:54,664 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:01:54" (1/1) ... [2021-05-06 05:01:54,664 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:01:54" (1/1) ... [2021-05-06 05:01:54,674 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:01:54" (1/1) ... [2021-05-06 05:01:54,678 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:01:54" (1/1) ... [2021-05-06 05:01:54,682 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:01:54" (1/1) ... [2021-05-06 05:01:54,687 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 05:01:54,688 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 05:01:54,688 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 05:01:54,688 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 05:01:54,688 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:01:54" (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 [2021-05-06 05:01:54,841 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 05:01:54,841 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 05:01:54,841 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 05:01:54,841 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 05:01:54,842 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 05:01:54,842 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 05:01:54,842 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 05:01:54,842 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 05:01:54,842 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 05:01:54,843 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 05:01:54,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-06 05:01:54,843 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 05:01:54,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 05:01:54,844 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 05:01:54,845 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 05:01:54,845 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 05:01:54,845 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 05:01:54,845 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 05:01:54,845 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 05:01:54,845 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 05:01:55,124 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 05:01:55,124 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 05:01:55,125 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:01:55 BoogieIcfgContainer [2021-05-06 05:01:55,125 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 05:01:55,126 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 05:01:55,126 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 05:01:55,128 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 05:01:55,128 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 05:01:54" (1/3) ... [2021-05-06 05:01:55,128 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f44833d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:01:55, skipping insertion in model container [2021-05-06 05:01:55,128 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:01:54" (2/3) ... [2021-05-06 05:01:55,129 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f44833d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:01:55, skipping insertion in model container [2021-05-06 05:01:55,129 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:01:55" (3/3) ... [2021-05-06 05:01:55,130 INFO L111 eAbstractionObserver]: Analyzing ICFG ps6-ll_unwindbound20.c [2021-05-06 05:01:55,154 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 05:01:55,156 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 05:01:55,167 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 05:01:55,197 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 05:01:55,198 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 05:01:55,198 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 05:01:55,198 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 05:01:55,198 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 05:01:55,198 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 05:01:55,198 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 05:01:55,198 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 05:01:55,212 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 05:01:55,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 05:01:55,215 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:01:55,216 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:01:55,216 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:01:55,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:01:55,223 INFO L82 PathProgramCache]: Analyzing trace with hash 21872251, now seen corresponding path program 1 times [2021-05-06 05:01:55,228 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:01:55,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405665380] [2021-05-06 05:01:55,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:01:55,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:01:55,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:01:55,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:01:55,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 05:01:55,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:01:55,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:01:55,395 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:01:55,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405665380] [2021-05-06 05:01:55,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405665380] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:01:55,396 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:01:55,396 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 05:01:55,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826232684] [2021-05-06 05:01:55,399 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 05:01:55,399 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:01:55,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 05:01:55,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:01:55,408 INFO L87 Difference]: Start difference. First operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 05:01:55,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:01:55,492 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2021-05-06 05:01:55,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 05:01:55,493 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-06 05:01:55,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:01:55,498 INFO L225 Difference]: With dead ends: 50 [2021-05-06 05:01:55,498 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 05:01:55,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:01:55,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 05:01:55,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-06 05:01:55,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 05:01:55,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-06 05:01:55,524 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 17 [2021-05-06 05:01:55,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:01:55,524 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-06 05:01:55,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 05:01:55,525 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-06 05:01:55,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 05:01:55,526 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:01:55,526 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:01:55,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 05:01:55,526 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:01:55,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:01:55,527 INFO L82 PathProgramCache]: Analyzing trace with hash -119968982, now seen corresponding path program 1 times [2021-05-06 05:01:55,527 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:01:55,527 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328723463] [2021-05-06 05:01:55,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:01:55,538 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:01:55,538 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1180908834] [2021-05-06 05:01:55,539 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 [2021-05-06 05:01:55,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:01:55,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 05:01:55,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:01:55,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:55,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:55,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:55,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:55,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:55,796 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:01:55,796 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:01:55,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328723463] [2021-05-06 05:01:55,796 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:01:55,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180908834] [2021-05-06 05:01:55,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180908834] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:01:55,797 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:01:55,797 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 05:01:55,797 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023492001] [2021-05-06 05:01:55,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 05:01:55,798 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:01:55,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 05:01:55,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 05:01:55,799 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 05:01:55,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:01:55,825 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-06 05:01:55,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 05:01:55,826 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-06 05:01:55,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:01:55,826 INFO L225 Difference]: With dead ends: 34 [2021-05-06 05:01:55,826 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 05:01:55,827 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.0ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 05:01:55,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 05:01:55,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 05:01:55,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 05:01:55,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-05-06 05:01:55,832 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 18 [2021-05-06 05:01:55,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:01:55,832 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-05-06 05:01:55,841 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 05:01:55,841 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-05-06 05:01:55,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 05:01:55,842 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:01:55,842 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:01:56,059 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 05:01:56,059 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:01:56,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:01:56,060 INFO L82 PathProgramCache]: Analyzing trace with hash -118181522, now seen corresponding path program 1 times [2021-05-06 05:01:56,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:01:56,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254566424] [2021-05-06 05:01:56,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:01:56,072 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:01:56,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [512949066] [2021-05-06 05:01:56,073 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 [2021-05-06 05:01:56,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:01:56,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 05:01:56,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:01:56,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:56,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:01:56,264 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:01:56,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254566424] [2021-05-06 05:01:56,264 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:01:56,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [512949066] [2021-05-06 05:01:56,264 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [512949066] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:01:56,264 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:01:56,264 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 05:01:56,265 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690506234] [2021-05-06 05:01:56,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 05:01:56,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:01:56,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 05:01:56,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 05:01:56,266 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 05:01:56,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:01:56,469 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-06 05:01:56,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 05:01:56,470 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-06 05:01:56,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:01:56,470 INFO L225 Difference]: With dead ends: 36 [2021-05-06 05:01:56,471 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 05:01:56,471 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.3ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:01:56,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 05:01:56,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 05:01:56,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 05:01:56,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-06 05:01:56,490 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 18 [2021-05-06 05:01:56,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:01:56,490 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-06 05:01:56,490 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 05:01:56,491 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-06 05:01:56,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 05:01:56,491 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:01:56,491 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:01:56,707 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:01:56,708 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:01:56,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:01:56,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1364840471, now seen corresponding path program 1 times [2021-05-06 05:01:56,708 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:01:56,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299736010] [2021-05-06 05:01:56,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:01:56,719 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:01:56,720 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1736897523] [2021-05-06 05:01:56,720 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 [2021-05-06 05:01:56,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:01:56,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 05:01:56,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:01:56,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:56,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:56,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:56,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:56,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:56,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:56,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:56,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:56,955 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:01:56,955 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:01:56,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299736010] [2021-05-06 05:01:56,955 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:01:56,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736897523] [2021-05-06 05:01:56,955 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736897523] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:01:56,955 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:01:56,955 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 05:01:56,955 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044577925] [2021-05-06 05:01:56,956 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 05:01:56,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:01:56,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 05:01:56,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 05:01:56,956 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 05:01:56,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:01:56,994 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-06 05:01:56,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:01:56,995 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-05-06 05:01:56,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:01:56,996 INFO L225 Difference]: With dead ends: 42 [2021-05-06 05:01:56,996 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 05:01:56,996 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 22.8ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:01:56,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 05:01:57,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-06 05:01:57,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 05:01:57,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-06 05:01:57,004 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2021-05-06 05:01:57,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:01:57,005 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-06 05:01:57,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 05:01:57,005 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-06 05:01:57,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 05:01:57,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:01:57,005 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:01:57,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:01:57,206 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:01:57,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:01:57,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1363053011, now seen corresponding path program 1 times [2021-05-06 05:01:57,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:01:57,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105984848] [2021-05-06 05:01:57,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:01:57,215 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:01:57,215 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1238824170] [2021-05-06 05:01:57,215 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 [2021-05-06 05:01:57,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:01:57,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 05:01:57,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:01:57,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,424 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:01:57,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:01:57,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105984848] [2021-05-06 05:01:57,425 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:01:57,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238824170] [2021-05-06 05:01:57,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1238824170] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:01:57,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:01:57,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 05:01:57,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869791816] [2021-05-06 05:01:57,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:01:57,425 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:01:57,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:01:57,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:01:57,426 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:01:57,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:01:57,477 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-06 05:01:57,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:01:57,478 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-05-06 05:01:57,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:01:57,478 INFO L225 Difference]: With dead ends: 44 [2021-05-06 05:01:57,479 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 05:01:57,479 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.9ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:01:57,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 05:01:57,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-06 05:01:57,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 28 states have internal predecessors, (30), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:01:57,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-05-06 05:01:57,485 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 26 [2021-05-06 05:01:57,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:01:57,485 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-05-06 05:01:57,485 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:01:57,485 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-05-06 05:01:57,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 05:01:57,486 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:01:57,486 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:01:57,703 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:01:57,703 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:01:57,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:01:57,703 INFO L82 PathProgramCache]: Analyzing trace with hash -595737176, now seen corresponding path program 2 times [2021-05-06 05:01:57,703 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:01:57,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892598857] [2021-05-06 05:01:57,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:01:57,711 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:01:57,711 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1903433775] [2021-05-06 05:01:57,711 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 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 [2021-05-06 05:01:57,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:01:57,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:01:57,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 05:01:57,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:01:57,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:01:57,843 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:01:57,843 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:01:57,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892598857] [2021-05-06 05:01:57,843 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:01:57,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903433775] [2021-05-06 05:01:57,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1903433775] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:01:57,844 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:01:57,844 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 05:01:57,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017918154] [2021-05-06 05:01:57,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:01:57,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:01:57,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:01:57,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:01:57,845 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 05:04:56,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:04:56,199 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-06 05:04:56,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 05:04:56,199 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2021-05-06 05:04:56,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:04:56,200 INFO L225 Difference]: With dead ends: 58 [2021-05-06 05:04:56,200 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 05:04:56,200 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 19.3ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:04:56,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 05:04:56,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-06 05:04:56,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 31 states have internal predecessors, (34), 10 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:04:56,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-06 05:04:56,206 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 34 [2021-05-06 05:04:56,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:04:56,206 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-06 05:04:56,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 05:04:56,206 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-06 05:04:56,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 05:04:56,207 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:04:56,207 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:04:56,424 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-06 05:04:56,424 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:04:56,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:04:56,425 INFO L82 PathProgramCache]: Analyzing trace with hash -593949716, now seen corresponding path program 2 times [2021-05-06 05:04:56,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:04:56,425 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943532581] [2021-05-06 05:04:56,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:04:56,442 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:04:56,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1562869198] [2021-05-06 05:04:56,442 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 [2021-05-06 05:04:56,553 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:04:56,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:04:56,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 05:04:56,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:04:56,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:56,671 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:04:56,671 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:04:56,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943532581] [2021-05-06 05:04:56,672 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:04:56,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1562869198] [2021-05-06 05:04:56,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1562869198] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:04:56,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:04:56,674 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:04:56,674 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830441204] [2021-05-06 05:04:56,674 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:04:56,674 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:04:56,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:04:56,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:04:56,676 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 05:04:56,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:04:56,746 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-05-06 05:04:56,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:04:56,747 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 34 [2021-05-06 05:04:56,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:04:56,750 INFO L225 Difference]: With dead ends: 56 [2021-05-06 05:04:56,750 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 05:04:56,751 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.4ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:04:56,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 05:04:56,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-06 05:04:56,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 36 states have internal predecessors, (39), 12 states have call successors, (12), 8 states have call predecessors, (12), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:04:56,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-05-06 05:04:56,772 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 34 [2021-05-06 05:04:56,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:04:56,772 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-05-06 05:04:56,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 05:04:56,772 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-05-06 05:04:56,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 05:04:56,773 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:04:56,773 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:04:56,981 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:04:56,981 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:04:56,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:04:56,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1559147673, now seen corresponding path program 1 times [2021-05-06 05:04:56,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:04:56,982 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258854237] [2021-05-06 05:04:56,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:04:56,989 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:04:56,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1176198552] [2021-05-06 05:04:56,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2021-05-06 05:04:57,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:04:57,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 05:04:57,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:04:57,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:57,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:57,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:57,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:57,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:57,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:57,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:57,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:57,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:57,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:57,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:57,239 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 05:04:57,239 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:04:57,239 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1258854237] [2021-05-06 05:04:57,239 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:04:57,239 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176198552] [2021-05-06 05:04:57,239 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1176198552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:04:57,239 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:04:57,239 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:04:57,239 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147577762] [2021-05-06 05:04:57,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:04:57,240 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:04:57,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:04:57,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:04:57,241 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-06 05:04:57,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:04:57,285 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-05-06 05:04:57,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:04:57,285 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 37 [2021-05-06 05:04:57,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:04:57,286 INFO L225 Difference]: With dead ends: 55 [2021-05-06 05:04:57,286 INFO L226 Difference]: Without dead ends: 49 [2021-05-06 05:04:57,287 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 36.6ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:04:57,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-06 05:04:57,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-06 05:04:57,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 05:04:57,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2021-05-06 05:04:57,292 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 37 [2021-05-06 05:04:57,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:04:57,292 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2021-05-06 05:04:57,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-06 05:04:57,292 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2021-05-06 05:04:57,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-06 05:04:57,293 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:04:57,293 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:04:57,500 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:04:57,501 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:04:57,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:04:57,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1224790937, now seen corresponding path program 3 times [2021-05-06 05:04:57,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:04:57,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927701935] [2021-05-06 05:04:57,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:04:57,509 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:04:57,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1966123331] [2021-05-06 05:04:57,509 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:04:59,410 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-06 05:04:59,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:04:59,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 05:04:59,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:04:59,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:59,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:59,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:04:59,550 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 05:04:59,550 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:04:59,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927701935] [2021-05-06 05:04:59,550 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:04:59,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966123331] [2021-05-06 05:04:59,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966123331] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:04:59,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:04:59,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:04:59,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333271490] [2021-05-06 05:04:59,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:04:59,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:04:59,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:04:59,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:04:59,552 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 05:04:59,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:04:59,604 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2021-05-06 05:04:59,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:04:59,604 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 42 [2021-05-06 05:04:59,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:04:59,605 INFO L225 Difference]: With dead ends: 55 [2021-05-06 05:04:59,605 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 05:04:59,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 32.9ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:04:59,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 05:04:59,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2021-05-06 05:04:59,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 05:04:59,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-05-06 05:04:59,610 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 42 [2021-05-06 05:04:59,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:04:59,611 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-05-06 05:04:59,611 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 05:04:59,611 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-05-06 05:04:59,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 05:04:59,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:04:59,618 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:04:59,819 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 05:04:59,819 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:04:59,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:04:59,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1537538120, now seen corresponding path program 2 times [2021-05-06 05:04:59,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:04:59,820 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141831709] [2021-05-06 05:04:59,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:04:59,826 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:04:59,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1106400094] [2021-05-06 05:04:59,826 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:00,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:05:00,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:05:00,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-06 05:05:00,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:00,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:00,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:01,877 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 8 [2021-05-06 05:05:01,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:01,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:01,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:01,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:01,915 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 16 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-06 05:05:01,915 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:01,915 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141831709] [2021-05-06 05:05:01,915 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:01,915 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106400094] [2021-05-06 05:05:01,915 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1106400094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:01,915 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:01,915 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 05:05:01,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207604599] [2021-05-06 05:05:01,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 05:05:01,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:01,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 05:05:01,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:05:01,916 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 11 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-06 05:05:02,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:02,045 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-05-06 05:05:02,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 05:05:02,046 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 45 [2021-05-06 05:05:02,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:02,046 INFO L225 Difference]: With dead ends: 52 [2021-05-06 05:05:02,046 INFO L226 Difference]: Without dead ends: 46 [2021-05-06 05:05:02,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1783.0ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:05:02,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-06 05:05:02,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-06 05:05:02,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:05:02,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2021-05-06 05:05:02,052 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 45 [2021-05-06 05:05:02,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:02,052 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2021-05-06 05:05:02,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-06 05:05:02,052 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2021-05-06 05:05:02,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 05:05:02,052 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:02,053 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:02,253 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:02,253 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:02,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:02,253 INFO L82 PathProgramCache]: Analyzing trace with hash -1448798205, now seen corresponding path program 1 times [2021-05-06 05:05:02,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:02,254 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446563469] [2021-05-06 05:05:02,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:02,259 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:02,260 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [277379621] [2021-05-06 05:05:02,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:02,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:05:02,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 05:05:02,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:02,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:02,435 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 18 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:05:02,435 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:02,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446563469] [2021-05-06 05:05:02,435 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:02,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [277379621] [2021-05-06 05:05:02,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [277379621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:02,435 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:02,435 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:05:02,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9389291] [2021-05-06 05:05:02,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:05:02,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:02,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:05:02,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:05:02,436 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 05:05:02,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:02,486 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2021-05-06 05:05:02,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 05:05:02,486 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) Word has length 47 [2021-05-06 05:05:02,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:02,487 INFO L225 Difference]: With dead ends: 62 [2021-05-06 05:05:02,487 INFO L226 Difference]: Without dead ends: 52 [2021-05-06 05:05:02,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 30.7ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:05:02,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-06 05:05:02,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-06 05:05:02,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:05:02,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2021-05-06 05:05:02,491 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2021-05-06 05:05:02,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:02,492 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2021-05-06 05:05:02,492 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 05:05:02,492 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2021-05-06 05:05:02,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 05:05:02,492 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:02,492 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:02,709 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:02,709 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:02,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:02,709 INFO L82 PathProgramCache]: Analyzing trace with hash 468857897, now seen corresponding path program 3 times [2021-05-06 05:05:02,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:02,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579779309] [2021-05-06 05:05:02,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:02,715 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:02,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1313207654] [2021-05-06 05:05:02,715 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:03,020 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 05:05:03,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:05:03,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-06 05:05:03,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:03,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,161 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 10 proven. 24 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 05:05:03,162 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:03,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579779309] [2021-05-06 05:05:03,162 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:03,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1313207654] [2021-05-06 05:05:03,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1313207654] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:03,162 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:03,162 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 05:05:03,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060437259] [2021-05-06 05:05:03,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 05:05:03,163 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:03,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 05:05:03,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:05:03,164 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-06 05:05:03,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:03,240 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2021-05-06 05:05:03,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 05:05:03,240 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 53 [2021-05-06 05:05:03,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:03,241 INFO L225 Difference]: With dead ends: 60 [2021-05-06 05:05:03,241 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 05:05:03,241 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 51.4ms TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:05:03,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 05:05:03,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-06 05:05:03,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 05:05:03,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2021-05-06 05:05:03,246 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 53 [2021-05-06 05:05:03,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:03,246 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2021-05-06 05:05:03,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-06 05:05:03,246 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2021-05-06 05:05:03,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 05:05:03,247 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:03,247 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:03,454 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-06 05:05:03,454 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:03,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:03,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1953308764, now seen corresponding path program 2 times [2021-05-06 05:05:03,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:03,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718511839] [2021-05-06 05:05:03,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:03,460 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:03,460 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1490628399] [2021-05-06 05:05:03,460 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:03,508 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:05:03,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:05:03,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 05:05:03,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:03,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:03,613 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:05:03,613 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:03,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718511839] [2021-05-06 05:05:03,614 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:03,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490628399] [2021-05-06 05:05:03,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1490628399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:03,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:03,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 05:05:03,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62476927] [2021-05-06 05:05:03,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 05:05:03,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:03,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 05:05:03,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:05:03,615 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:05:03,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:03,671 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2021-05-06 05:05:03,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 05:05:03,671 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) Word has length 55 [2021-05-06 05:05:03,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:03,671 INFO L225 Difference]: With dead ends: 70 [2021-05-06 05:05:03,671 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 05:05:03,672 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 38.6ms TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:05:03,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 05:05:03,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-06 05:05:03,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 10 states have call successors, (10), 9 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 05:05:03,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-05-06 05:05:03,676 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 55 [2021-05-06 05:05:03,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:03,677 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-05-06 05:05:03,677 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:05:03,677 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-05-06 05:05:03,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 05:05:03,677 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:03,677 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:03,894 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-06 05:05:03,894 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:03,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:03,894 INFO L82 PathProgramCache]: Analyzing trace with hash 1425669898, now seen corresponding path program 4 times [2021-05-06 05:05:03,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:03,895 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105048507] [2021-05-06 05:05:03,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:03,899 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:03,899 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [267610074] [2021-05-06 05:05:03,899 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:03,940 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:05:03,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:05:03,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-06 05:05:03,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:04,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,094 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 12 proven. 40 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-06 05:05:04,094 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:04,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105048507] [2021-05-06 05:05:04,094 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:04,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267610074] [2021-05-06 05:05:04,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267610074] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:04,094 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:04,094 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 05:05:04,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779070849] [2021-05-06 05:05:04,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 05:05:04,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:04,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 05:05:04,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:05:04,095 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-06 05:05:04,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:04,186 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2021-05-06 05:05:04,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 05:05:04,187 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 61 [2021-05-06 05:05:04,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:04,187 INFO L225 Difference]: With dead ends: 68 [2021-05-06 05:05:04,187 INFO L226 Difference]: Without dead ends: 62 [2021-05-06 05:05:04,188 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 58.6ms TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:05:04,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-06 05:05:04,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-05-06 05:05:04,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 11 states have call successors, (11), 9 states have call predecessors, (11), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:05:04,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2021-05-06 05:05:04,192 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 61 [2021-05-06 05:05:04,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:04,192 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2021-05-06 05:05:04,192 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-06 05:05:04,193 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2021-05-06 05:05:04,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 05:05:04,193 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:04,193 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:04,410 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 05:05:04,410 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:04,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:04,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1579977147, now seen corresponding path program 3 times [2021-05-06 05:05:04,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:04,411 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053693299] [2021-05-06 05:05:04,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:04,415 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:04,415 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [880908182] [2021-05-06 05:05:04,415 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:04,925 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-06 05:05:04,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:05:04,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 05:05:04,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:04,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:04,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,086 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:05:05,086 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:05,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053693299] [2021-05-06 05:05:05,086 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:05,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880908182] [2021-05-06 05:05:05,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880908182] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:05,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:05,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 05:05:05,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985970136] [2021-05-06 05:05:05,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 05:05:05,087 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:05,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 05:05:05,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:05:05,087 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 8 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 05:05:05,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:05,165 INFO L93 Difference]: Finished difference Result 78 states and 80 transitions. [2021-05-06 05:05:05,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 05:05:05,165 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 8 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) Word has length 63 [2021-05-06 05:05:05,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:05,166 INFO L225 Difference]: With dead ends: 78 [2021-05-06 05:05:05,166 INFO L226 Difference]: Without dead ends: 68 [2021-05-06 05:05:05,166 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 53.3ms TimeCoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:05:05,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-06 05:05:05,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-05-06 05:05:05,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 11 states have call successors, (11), 10 states have call predecessors, (11), 8 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:05:05,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-05-06 05:05:05,170 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 63 [2021-05-06 05:05:05,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:05,170 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-05-06 05:05:05,170 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 8 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 05:05:05,170 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-05-06 05:05:05,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 05:05:05,171 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:05,171 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:05,376 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:05,377 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:05,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:05,377 INFO L82 PathProgramCache]: Analyzing trace with hash -423798549, now seen corresponding path program 5 times [2021-05-06 05:05:05,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:05,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143275783] [2021-05-06 05:05:05,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:05,382 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:05,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1937353752] [2021-05-06 05:05:05,382 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:05,958 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-06 05:05:05,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:05:05,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-06 05:05:05,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:05,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:05,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,257 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 31 proven. 61 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-06 05:05:06,258 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:06,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143275783] [2021-05-06 05:05:06,258 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:06,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937353752] [2021-05-06 05:05:06,258 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937353752] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:06,258 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:06,258 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-06 05:05:06,258 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638591128] [2021-05-06 05:05:06,258 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 05:05:06,258 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:06,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 05:05:06,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:05:06,259 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 14 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 9 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-05-06 05:05:06,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:06,458 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2021-05-06 05:05:06,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 05:05:06,459 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 9 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 69 [2021-05-06 05:05:06,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:06,459 INFO L225 Difference]: With dead ends: 76 [2021-05-06 05:05:06,459 INFO L226 Difference]: Without dead ends: 70 [2021-05-06 05:05:06,460 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 183.5ms TimeCoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-05-06 05:05:06,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-06 05:05:06,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-05-06 05:05:06,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 12 states have call successors, (12), 10 states have call predecessors, (12), 8 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 05:05:06,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 73 transitions. [2021-05-06 05:05:06,464 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 73 transitions. Word has length 69 [2021-05-06 05:05:06,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:06,464 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 73 transitions. [2021-05-06 05:05:06,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 9 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-05-06 05:05:06,466 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 73 transitions. [2021-05-06 05:05:06,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 05:05:06,467 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:06,467 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:06,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:06,673 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:06,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:06,674 INFO L82 PathProgramCache]: Analyzing trace with hash -802694170, now seen corresponding path program 4 times [2021-05-06 05:05:06,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:06,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190773961] [2021-05-06 05:05:06,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:06,681 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:06,681 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1488665454] [2021-05-06 05:05:06,681 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:06,731 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:05:06,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:05:06,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 05:05:06,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:06,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:06,877 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:05:06,878 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:06,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190773961] [2021-05-06 05:05:06,878 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:06,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488665454] [2021-05-06 05:05:06,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488665454] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:06,878 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:06,878 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 05:05:06,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138288756] [2021-05-06 05:05:06,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 05:05:06,878 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:06,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 05:05:06,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:05:06,879 INFO L87 Difference]: Start difference. First operand 70 states and 73 transitions. Second operand has 10 states, 10 states have (on average 5.0) internal successors, (50), 9 states have internal predecessors, (50), 9 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:05:06,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:06,958 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2021-05-06 05:05:06,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 05:05:06,959 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.0) internal successors, (50), 9 states have internal predecessors, (50), 9 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) Word has length 71 [2021-05-06 05:05:06,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:06,959 INFO L225 Difference]: With dead ends: 86 [2021-05-06 05:05:06,959 INFO L226 Difference]: Without dead ends: 76 [2021-05-06 05:05:06,959 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 79.9ms TimeCoverageRelationStatistics Valid=92, Invalid=148, Unknown=0, NotChecked=0, Total=240 [2021-05-06 05:05:06,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-06 05:05:06,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-05-06 05:05:06,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 12 states have call successors, (12), 11 states have call predecessors, (12), 9 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 05:05:06,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2021-05-06 05:05:06,964 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 71 [2021-05-06 05:05:06,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:06,964 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2021-05-06 05:05:06,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 5.0) internal successors, (50), 9 states have internal predecessors, (50), 9 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:05:06,964 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2021-05-06 05:05:06,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 05:05:06,965 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:06,965 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:07,179 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:07,179 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:07,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:07,180 INFO L82 PathProgramCache]: Analyzing trace with hash 540885452, now seen corresponding path program 6 times [2021-05-06 05:05:07,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:07,180 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087388002] [2021-05-06 05:05:07,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:07,190 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:07,190 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1758753065] [2021-05-06 05:05:07,190 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:07,904 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-06 05:05:07,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:05:07,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-06 05:05:07,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:08,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:08,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:08,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:08,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:08,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:08,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:08,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:08,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:08,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:08,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:08,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:08,071 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 05:05:08,071 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:08,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087388002] [2021-05-06 05:05:08,071 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:08,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758753065] [2021-05-06 05:05:08,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758753065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:08,071 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:08,071 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-06 05:05:08,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928411521] [2021-05-06 05:05:08,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 05:05:08,073 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:08,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 05:05:08,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:05:08,073 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 11 states have internal predecessors, (34), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-05-06 05:05:08,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:08,242 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2021-05-06 05:05:08,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 05:05:08,242 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 11 states have internal predecessors, (34), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 77 [2021-05-06 05:05:08,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:08,243 INFO L225 Difference]: With dead ends: 84 [2021-05-06 05:05:08,243 INFO L226 Difference]: Without dead ends: 78 [2021-05-06 05:05:08,243 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 77.8ms TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:05:08,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-06 05:05:08,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-06 05:05:08,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 states have internal predecessors, (57), 13 states have call successors, (13), 11 states have call predecessors, (13), 9 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 05:05:08,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 81 transitions. [2021-05-06 05:05:08,248 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 81 transitions. Word has length 77 [2021-05-06 05:05:08,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:08,248 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 81 transitions. [2021-05-06 05:05:08,248 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 11 states have internal predecessors, (34), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-05-06 05:05:08,248 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 81 transitions. [2021-05-06 05:05:08,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 05:05:08,249 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:08,249 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:08,449 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 05:05:08,449 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:08,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:08,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1454305145, now seen corresponding path program 5 times [2021-05-06 05:05:08,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:08,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900104543] [2021-05-06 05:05:08,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:08,454 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:08,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [318230146] [2021-05-06 05:05:08,454 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:09,610 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-06 05:05:09,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:05:09,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 05:05:09,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:09,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:09,751 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 42 proven. 182 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:05:09,751 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:09,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900104543] [2021-05-06 05:05:09,751 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:09,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318230146] [2021-05-06 05:05:09,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318230146] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:09,751 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:09,751 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 05:05:09,752 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878626891] [2021-05-06 05:05:09,753 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 05:05:09,753 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:09,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 05:05:09,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:05:09,753 INFO L87 Difference]: Start difference. First operand 78 states and 81 transitions. Second operand has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 10 states have call successors, (12), 10 states have call predecessors, (12), 9 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 05:05:09,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:09,841 INFO L93 Difference]: Finished difference Result 94 states and 96 transitions. [2021-05-06 05:05:09,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 05:05:09,842 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 10 states have call successors, (12), 10 states have call predecessors, (12), 9 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) Word has length 79 [2021-05-06 05:05:09,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:09,842 INFO L225 Difference]: With dead ends: 94 [2021-05-06 05:05:09,842 INFO L226 Difference]: Without dead ends: 84 [2021-05-06 05:05:09,843 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 71.8ms TimeCoverageRelationStatistics Valid=117, Invalid=189, Unknown=0, NotChecked=0, Total=306 [2021-05-06 05:05:09,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-06 05:05:09,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-05-06 05:05:09,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 states have internal predecessors, (62), 13 states have call successors, (13), 12 states have call predecessors, (13), 10 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 05:05:09,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2021-05-06 05:05:09,847 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 79 [2021-05-06 05:05:09,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:09,847 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2021-05-06 05:05:09,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 10 states have call successors, (12), 10 states have call predecessors, (12), 9 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 05:05:09,847 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2021-05-06 05:05:09,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 05:05:09,848 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:09,848 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:10,054 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-06 05:05:10,054 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:10,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:10,055 INFO L82 PathProgramCache]: Analyzing trace with hash -1082476115, now seen corresponding path program 7 times [2021-05-06 05:05:10,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:10,055 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988908375] [2021-05-06 05:05:10,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:10,059 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:10,059 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2085310694] [2021-05-06 05:05:10,059 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:10,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:05:10,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-06 05:05:10,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:10,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:10,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:10,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:10,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:10,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:10,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:10,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:10,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:10,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:10,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:10,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:10,936 INFO L134 CoverageAnalysis]: Checked inductivity of 274 backedges. 18 proven. 112 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-06 05:05:10,936 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:10,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988908375] [2021-05-06 05:05:10,936 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:10,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085310694] [2021-05-06 05:05:10,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085310694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:10,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:10,936 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-06 05:05:10,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411678024] [2021-05-06 05:05:10,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 05:05:10,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:10,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 05:05:10,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-05-06 05:05:10,937 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand has 13 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 10 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-05-06 05:05:11,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:11,086 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2021-05-06 05:05:11,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 05:05:11,087 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 10 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 85 [2021-05-06 05:05:11,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:11,088 INFO L225 Difference]: With dead ends: 92 [2021-05-06 05:05:11,088 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 05:05:11,090 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 80.3ms TimeCoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-06 05:05:11,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 05:05:11,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-05-06 05:05:11,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 14 states have call successors, (14), 12 states have call predecessors, (14), 10 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 05:05:11,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 89 transitions. [2021-05-06 05:05:11,096 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 89 transitions. Word has length 85 [2021-05-06 05:05:11,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:11,096 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 89 transitions. [2021-05-06 05:05:11,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 10 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-05-06 05:05:11,096 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 89 transitions. [2021-05-06 05:05:11,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-06 05:05:11,097 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:11,097 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:11,303 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-06 05:05:11,303 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:11,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:11,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1863324712, now seen corresponding path program 6 times [2021-05-06 05:05:11,303 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:11,303 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444582549] [2021-05-06 05:05:11,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:11,322 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:11,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [630235230] [2021-05-06 05:05:11,322 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:05:11,608 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-06 05:05:11,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:05:11,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-06 05:05:11,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:05:11,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:05:11,761 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 48 proven. 240 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:05:11,761 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:05:11,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444582549] [2021-05-06 05:05:11,761 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:05:11,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [630235230] [2021-05-06 05:05:11,761 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [630235230] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:05:11,761 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:05:11,761 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-06 05:05:11,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860901913] [2021-05-06 05:05:11,762 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 05:05:11,762 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:05:11,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 05:05:11,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:05:11,762 INFO L87 Difference]: Start difference. First operand 86 states and 89 transitions. Second operand has 12 states, 12 states have (on average 5.166666666666667) internal successors, (62), 11 states have internal predecessors, (62), 11 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 05:05:11,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:05:11,873 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2021-05-06 05:05:11,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 05:05:11,873 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 5.166666666666667) internal successors, (62), 11 states have internal predecessors, (62), 11 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) Word has length 87 [2021-05-06 05:05:11,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:05:11,874 INFO L225 Difference]: With dead ends: 102 [2021-05-06 05:05:11,874 INFO L226 Difference]: Without dead ends: 92 [2021-05-06 05:05:11,875 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 100.5ms TimeCoverageRelationStatistics Valid=145, Invalid=235, Unknown=0, NotChecked=0, Total=380 [2021-05-06 05:05:11,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-06 05:05:11,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-05-06 05:05:11,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 14 states have call successors, (14), 13 states have call predecessors, (14), 11 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 05:05:11,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2021-05-06 05:05:11,879 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 87 [2021-05-06 05:05:11,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:05:11,879 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2021-05-06 05:05:11,879 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 5.166666666666667) internal successors, (62), 11 states have internal predecessors, (62), 11 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 05:05:11,879 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2021-05-06 05:05:11,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 05:05:11,880 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:05:11,880 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:05:12,084 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-06 05:05:12,085 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:05:12,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:05:12,085 INFO L82 PathProgramCache]: Analyzing trace with hash -243875698, now seen corresponding path program 8 times [2021-05-06 05:05:12,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:05:12,085 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500040128] [2021-05-06 05:05:12,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:05:12,090 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:05:12,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1116178898] [2021-05-06 05:05:12,090 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:15:19,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:15:19,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:15:19,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-06 05:15:19,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:15:19,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,377 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-05-06 05:15:19,377 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:15:19,377 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500040128] [2021-05-06 05:15:19,377 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:15:19,377 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116178898] [2021-05-06 05:15:19,377 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1116178898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:15:19,377 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:15:19,377 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-06 05:15:19,377 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890647854] [2021-05-06 05:15:19,378 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 05:15:19,378 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:15:19,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 05:15:19,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:15:19,379 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand has 14 states, 13 states have (on average 3.076923076923077) internal successors, (40), 13 states have internal predecessors, (40), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-06 05:15:19,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:15:19,569 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2021-05-06 05:15:19,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 05:15:19,569 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 3.076923076923077) internal successors, (40), 13 states have internal predecessors, (40), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) Word has length 93 [2021-05-06 05:15:19,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:15:19,570 INFO L225 Difference]: With dead ends: 100 [2021-05-06 05:15:19,570 INFO L226 Difference]: Without dead ends: 94 [2021-05-06 05:15:19,570 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 120.2ms TimeCoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-05-06 05:15:19,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-06 05:15:19,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-05-06 05:15:19,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 15 states have call successors, (15), 13 states have call predecessors, (15), 11 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 05:15:19,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 97 transitions. [2021-05-06 05:15:19,575 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 97 transitions. Word has length 93 [2021-05-06 05:15:19,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:15:19,575 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 97 transitions. [2021-05-06 05:15:19,575 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 3.076923076923077) internal successors, (40), 13 states have internal predecessors, (40), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-06 05:15:19,575 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 97 transitions. [2021-05-06 05:15:19,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 05:15:19,576 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:15:19,576 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:15:19,796 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-06 05:15:19,797 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:15:19,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:15:19,797 INFO L82 PathProgramCache]: Analyzing trace with hash 304473801, now seen corresponding path program 7 times [2021-05-06 05:15:19,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:15:19,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [938892082] [2021-05-06 05:15:19,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:15:19,801 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:15:19,801 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [689174933] [2021-05-06 05:15:19,802 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:15:19,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:15:19,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-06 05:15:19,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:15:19,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:19,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:20,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:20,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:20,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:20,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:20,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:20,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:20,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:20,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:15:20,047 INFO L134 CoverageAnalysis]: Checked inductivity of 362 backedges. 54 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:15:20,047 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:15:20,047 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [938892082] [2021-05-06 05:15:20,047 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:15:20,047 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689174933] [2021-05-06 05:15:20,048 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689174933] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:15:20,048 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:15:20,048 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-06 05:15:20,048 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564497497] [2021-05-06 05:15:20,048 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 05:15:20,048 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:15:20,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 05:15:20,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-06 05:15:20,049 INFO L87 Difference]: Start difference. First operand 94 states and 97 transitions. Second operand has 13 states, 13 states have (on average 5.230769230769231) internal successors, (68), 12 states have internal predecessors, (68), 12 states have call successors, (14), 12 states have call predecessors, (14), 11 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 05:15:20,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:15:20,156 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2021-05-06 05:15:20,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 05:15:20,156 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 5.230769230769231) internal successors, (68), 12 states have internal predecessors, (68), 12 states have call successors, (14), 12 states have call predecessors, (14), 11 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) Word has length 95 [2021-05-06 05:15:20,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:15:20,157 INFO L225 Difference]: With dead ends: 110 [2021-05-06 05:15:20,157 INFO L226 Difference]: Without dead ends: 100 [2021-05-06 05:15:20,157 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 97.4ms TimeCoverageRelationStatistics Valid=176, Invalid=286, Unknown=0, NotChecked=0, Total=462 [2021-05-06 05:15:20,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-06 05:15:20,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-05-06 05:15:20,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 72 states have (on average 1.0277777777777777) internal successors, (74), 72 states have internal predecessors, (74), 15 states have call successors, (15), 14 states have call predecessors, (15), 12 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 05:15:20,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2021-05-06 05:15:20,162 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 95 [2021-05-06 05:15:20,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:15:20,162 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2021-05-06 05:15:20,162 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 5.230769230769231) internal successors, (68), 12 states have internal predecessors, (68), 12 states have call successors, (14), 12 states have call predecessors, (14), 11 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 05:15:20,162 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2021-05-06 05:15:20,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 05:15:20,163 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:15:20,163 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:15:20,379 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:15:20,379 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:15:20,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:15:20,379 INFO L82 PathProgramCache]: Analyzing trace with hash 1379030639, now seen corresponding path program 9 times [2021-05-06 05:15:20,379 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:15:20,379 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319017550] [2021-05-06 05:15:20,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:15:20,384 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:15:20,384 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1977858280] [2021-05-06 05:15:20,384 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:15:34,239 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-06 05:15:34,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:15:34,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-06 05:15:34,258 INFO L286 TraceCheckSpWp]: Computing forward predicates...