/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/loops-crafted-1/vnew2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:29:30,145 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:29:30,148 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:29:30,193 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 13:29:30,194 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 13:29:30,198 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 13:29:30,200 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 13:29:30,206 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 13:29:30,208 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 13:29:30,214 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 13:29:30,215 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 13:29:30,216 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 13:29:30,217 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:29:30,218 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:29:30,220 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:29:30,221 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:29:30,224 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:29:30,225 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:29:30,228 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:29:30,232 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:29:30,234 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:29:30,235 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:29:30,236 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:29:30,238 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:29:30,242 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 13:29:30,242 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 13:29:30,243 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 13:29:30,244 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 13:29:30,244 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 13:29:30,247 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 13:29:30,247 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 13:29:30,248 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 13:29:30,250 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 13:29:30,250 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 13:29:30,251 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 13:29:30,251 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 13:29:30,252 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 13:29:30,252 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 13:29:30,252 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:29:30,253 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:29:30,254 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:29:30,257 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 [2021-05-02 13:29:30,312 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:29:30,312 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:29:30,315 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:29:30,316 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:29:30,316 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:29:30,316 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:29:30,316 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:29:30,316 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:29:30,316 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:29:30,317 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:29:30,317 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:29:30,318 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:29:30,318 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:29:30,318 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:29:30,318 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:29:30,318 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:29:30,318 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:29:30,318 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:29:30,319 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:29:30,319 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:29:30,319 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:29:30,319 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:29:30,319 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:29:30,319 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:29:30,319 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:29:30,320 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:29:30,320 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:29:30,320 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:29:30,320 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:29:30,629 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:29:30,657 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:29:30,658 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:29:30,659 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:29:30,660 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:29:30,660 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/vnew2.c [2021-05-02 13:29:30,727 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c13631398/8621fe15c25f4691a042f77e885e6375/FLAG31341c6d6 [2021-05-02 13:29:31,203 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:29:31,205 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/vnew2.c [2021-05-02 13:29:31,211 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c13631398/8621fe15c25f4691a042f77e885e6375/FLAG31341c6d6 [2021-05-02 13:29:31,607 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c13631398/8621fe15c25f4691a042f77e885e6375 [2021-05-02 13:29:31,610 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:29:31,611 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:29:31,613 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:29:31,613 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:29:31,617 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:29:31,618 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:29:31" (1/1) ... [2021-05-02 13:29:31,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7b516c55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:29:31, skipping insertion in model container [2021-05-02 13:29:31,619 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:29:31" (1/1) ... [2021-05-02 13:29:31,626 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:29:31,638 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:29:31,772 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/vnew2.c[403,416] [2021-05-02 13:29:31,789 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:29:31,796 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:29:31,818 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/vnew2.c[403,416] [2021-05-02 13:29:31,840 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:29:31,854 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:29:31,854 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:29:31 WrapperNode [2021-05-02 13:29:31,855 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:29:31,856 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:29:31,856 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:29:31,858 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:29:31,867 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:29:31" (1/1) ... [2021-05-02 13:29:31,867 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:29:31" (1/1) ... [2021-05-02 13:29:31,875 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:29:31" (1/1) ... [2021-05-02 13:29:31,875 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:29:31" (1/1) ... [2021-05-02 13:29:31,889 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:29:31" (1/1) ... [2021-05-02 13:29:31,894 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:29:31" (1/1) ... [2021-05-02 13:29:31,896 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:29:31" (1/1) ... [2021-05-02 13:29:31,902 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:29:31,903 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:29:31,903 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:29:31,903 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:29:31,904 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:29:31" (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 [2021-05-02 13:29:31,980 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:29:31,980 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:29:31,980 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:29:31,981 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 13:29:31,981 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:29:31,981 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:29:31,981 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:29:31,981 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:29:31,982 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:29:31,982 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:29:31,982 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 13:29:31,982 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:29:31,983 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 13:29:31,983 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:29:31,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:29:31,984 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:29:31,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:29:31,984 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:29:31,984 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:29:31,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:29:32,252 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:29:32,252 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:29:32,253 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:29:32 BoogieIcfgContainer [2021-05-02 13:29:32,253 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:29:32,255 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:29:32,255 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:29:32,257 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:29:32,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:29:31" (1/3) ... [2021-05-02 13:29:32,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e4c9dc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:29:32, skipping insertion in model container [2021-05-02 13:29:32,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:29:31" (2/3) ... [2021-05-02 13:29:32,259 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e4c9dc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:29:32, skipping insertion in model container [2021-05-02 13:29:32,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:29:32" (3/3) ... [2021-05-02 13:29:32,260 INFO L111 eAbstractionObserver]: Analyzing ICFG vnew2.c [2021-05-02 13:29:32,265 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:29:32,268 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:29:32,282 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:29:32,320 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:29:32,320 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:29:32,320 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:29:32,320 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:29:32,321 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:29:32,321 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:29:32,321 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:29:32,321 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:29:32,333 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:29:32,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 13:29:32,338 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:32,339 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:32,339 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:32,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:32,360 INFO L82 PathProgramCache]: Analyzing trace with hash -818707046, now seen corresponding path program 1 times [2021-05-02 13:29:32,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:32,368 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041893176] [2021-05-02 13:29:32,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:32,468 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:32,469 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [388856384] [2021-05-02 13:29:32,469 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 [2021-05-02 13:29:32,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:32,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:29:32,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:32,698 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:32,698 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:32,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041893176] [2021-05-02 13:29:32,699 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:32,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388856384] [2021-05-02 13:29:32,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [388856384] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:29:32,699 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:29:32,699 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:29:32,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993930238] [2021-05-02 13:29:32,705 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:29:32,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:32,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:29:32,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:29:32,723 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:32,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:32,775 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2021-05-02 13:29:32,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:29:32,777 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 13:29:32,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:32,782 INFO L225 Difference]: With dead ends: 42 [2021-05-02 13:29:32,782 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 13:29:32,785 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:29:32,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 13:29:32,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 13:29:32,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:32,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2021-05-02 13:29:32,815 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2021-05-02 13:29:32,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:32,816 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2021-05-02 13:29:32,816 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:32,816 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2021-05-02 13:29:32,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 13:29:32,817 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:32,817 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:33,029 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-05-02 13:29:33,029 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:33,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:33,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1914943323, now seen corresponding path program 1 times [2021-05-02 13:29:33,031 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:33,031 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061148090] [2021-05-02 13:29:33,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:33,057 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:33,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1049673580] [2021-05-02 13:29:33,058 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 [2021-05-02 13:29:33,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:33,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:29:33,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:33,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:33,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:33,353 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:33,353 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061148090] [2021-05-02 13:29:33,353 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:33,353 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049673580] [2021-05-02 13:29:33,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049673580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:33,354 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:33,354 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:29:33,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746433472] [2021-05-02 13:29:33,355 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:29:33,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:33,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:29:33,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:29:33,357 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 8 states, 8 states have (on average 1.25) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:33,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:33,418 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2021-05-02 13:29:33,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:29:33,418 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.25) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 13:29:33,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:33,419 INFO L225 Difference]: With dead ends: 22 [2021-05-02 13:29:33,419 INFO L226 Difference]: Without dead ends: 16 [2021-05-02 13:29:33,420 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 65.7ms TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:29:33,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-02 13:29:33,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-02 13:29:33,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:33,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2021-05-02 13:29:33,423 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2021-05-02 13:29:33,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:33,424 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2021-05-02 13:29:33,424 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.25) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:33,424 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2021-05-02 13:29:33,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 13:29:33,424 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:33,425 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:33,647 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:33,647 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:33,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:33,648 INFO L82 PathProgramCache]: Analyzing trace with hash 758758842, now seen corresponding path program 2 times [2021-05-02 13:29:33,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:33,648 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9603761] [2021-05-02 13:29:33,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:33,717 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:33,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [503169182] [2021-05-02 13:29:33,718 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 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 [2021-05-02 13:29:34,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:29:34,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:34,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:29:34,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:34,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:34,160 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:34,160 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:34,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9603761] [2021-05-02 13:29:34,161 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:34,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503169182] [2021-05-02 13:29:34,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503169182] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:34,161 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:34,161 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 13:29:34,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686904682] [2021-05-02 13:29:34,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:29:34,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:34,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:29:34,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:29:34,163 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 7 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:34,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:34,251 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2021-05-02 13:29:34,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:29:34,251 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 7 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 13:29:34,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:34,252 INFO L225 Difference]: With dead ends: 23 [2021-05-02 13:29:34,252 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 13:29:34,253 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 84.9ms TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:29:34,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 13:29:34,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 13:29:34,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:34,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2021-05-02 13:29:34,256 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2021-05-02 13:29:34,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:34,257 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2021-05-02 13:29:34,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 7 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:34,257 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2021-05-02 13:29:34,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 13:29:34,258 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:34,258 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:34,473 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:34,473 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:34,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:34,474 INFO L82 PathProgramCache]: Analyzing trace with hash -723221701, now seen corresponding path program 3 times [2021-05-02 13:29:34,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:34,474 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637032289] [2021-05-02 13:29:34,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:34,496 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:34,496 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1764870910] [2021-05-02 13:29:34,496 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 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 [2021-05-02 13:29:34,644 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:29:34,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:34,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 13:29:34,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:34,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:34,835 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:34,835 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:34,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637032289] [2021-05-02 13:29:34,836 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:34,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764870910] [2021-05-02 13:29:34,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764870910] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:34,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:34,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:29:34,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982591367] [2021-05-02 13:29:34,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:29:34,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:34,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:29:34,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:29:34,839 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 10 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:34,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:34,939 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2021-05-02 13:29:34,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:29:34,939 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 13:29:34,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:34,941 INFO L225 Difference]: With dead ends: 24 [2021-05-02 13:29:34,941 INFO L226 Difference]: Without dead ends: 18 [2021-05-02 13:29:34,942 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 109.4ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:29:34,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-02 13:29:34,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-05-02 13:29:34,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:34,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2021-05-02 13:29:34,948 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2021-05-02 13:29:34,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:34,949 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2021-05-02 13:29:34,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:34,949 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2021-05-02 13:29:34,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:29:34,950 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:34,958 INFO L523 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:35,162 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:35,163 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:35,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:35,164 INFO L82 PathProgramCache]: Analyzing trace with hash 580021722, now seen corresponding path program 4 times [2021-05-02 13:29:35,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:35,164 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058264180] [2021-05-02 13:29:35,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:35,181 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:35,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1305902563] [2021-05-02 13:29:35,182 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 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 [2021-05-02 13:29:35,255 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:29:35,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:35,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 13:29:35,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:35,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:35,430 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:35,430 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:35,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058264180] [2021-05-02 13:29:35,431 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:35,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305902563] [2021-05-02 13:29:35,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305902563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:35,431 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:35,431 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 13:29:35,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597533931] [2021-05-02 13:29:35,431 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:29:35,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:35,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:29:35,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:29:35,432 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 9 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:35,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:35,556 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2021-05-02 13:29:35,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:29:35,557 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 9 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:29:35,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:35,558 INFO L225 Difference]: With dead ends: 25 [2021-05-02 13:29:35,558 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 13:29:35,559 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 128.0ms TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:29:35,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 13:29:35,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 13:29:35,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:35,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2021-05-02 13:29:35,566 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2021-05-02 13:29:35,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:35,566 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2021-05-02 13:29:35,566 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 9 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:35,567 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2021-05-02 13:29:35,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 13:29:35,567 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:35,568 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:35,773 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:35,773 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:35,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:35,773 INFO L82 PathProgramCache]: Analyzing trace with hash -1969105125, now seen corresponding path program 5 times [2021-05-02 13:29:35,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:35,774 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141567264] [2021-05-02 13:29:35,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:35,792 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:35,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [833823246] [2021-05-02 13:29:35,793 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 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 [2021-05-02 13:29:35,890 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:29:35,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:35,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 13:29:35,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:36,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:36,065 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:36,065 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:36,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141567264] [2021-05-02 13:29:36,066 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:36,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833823246] [2021-05-02 13:29:36,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833823246] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:36,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:36,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 13:29:36,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631432833] [2021-05-02 13:29:36,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:29:36,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:36,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:29:36,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:29:36,067 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand has 12 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:36,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:36,200 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2021-05-02 13:29:36,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:29:36,201 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 13:29:36,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:36,201 INFO L225 Difference]: With dead ends: 26 [2021-05-02 13:29:36,201 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 13:29:36,202 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 140.5ms TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:29:36,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 13:29:36,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-02 13:29:36,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 15 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:36,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2021-05-02 13:29:36,205 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2021-05-02 13:29:36,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:36,205 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2021-05-02 13:29:36,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:36,206 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2021-05-02 13:29:36,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 13:29:36,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:36,206 INFO L523 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:36,409 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:36,410 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:36,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:36,410 INFO L82 PathProgramCache]: Analyzing trace with hash 612341242, now seen corresponding path program 6 times [2021-05-02 13:29:36,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:36,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354657986] [2021-05-02 13:29:36,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:36,427 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:36,428 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [841172126] [2021-05-02 13:29:36,428 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 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 [2021-05-02 13:29:36,658 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:29:36,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:36,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 13:29:36,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:36,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:36,853 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:36,853 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:36,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354657986] [2021-05-02 13:29:36,853 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:36,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841172126] [2021-05-02 13:29:36,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841172126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:36,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:36,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 13:29:36,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136804262] [2021-05-02 13:29:36,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:29:36,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:36,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:29:36,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:29:36,855 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 11 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:36,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:36,986 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2021-05-02 13:29:36,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:29:36,987 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 11 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 13:29:36,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:36,988 INFO L225 Difference]: With dead ends: 27 [2021-05-02 13:29:36,988 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 13:29:36,989 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 138.6ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:29:36,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 13:29:36,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-02 13:29:36,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:36,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2021-05-02 13:29:36,996 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2021-05-02 13:29:36,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:36,996 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2021-05-02 13:29:36,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 11 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:36,996 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2021-05-02 13:29:36,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 13:29:36,997 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:36,997 INFO L523 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:37,212 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:37,213 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:37,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:37,213 INFO L82 PathProgramCache]: Analyzing trace with hash -967200005, now seen corresponding path program 7 times [2021-05-02 13:29:37,214 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:37,214 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11556182] [2021-05-02 13:29:37,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:37,233 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:37,234 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1345724981] [2021-05-02 13:29:37,234 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 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 [2021-05-02 13:29:37,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:37,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 13:29:37,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:37,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:37,603 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:37,603 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:37,603 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11556182] [2021-05-02 13:29:37,604 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:37,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345724981] [2021-05-02 13:29:37,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345724981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:37,604 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:37,604 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 13:29:37,604 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974827062] [2021-05-02 13:29:37,604 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:29:37,605 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:37,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:29:37,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:29:37,607 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:37,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:37,755 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2021-05-02 13:29:37,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:29:37,755 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 13:29:37,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:37,759 INFO L225 Difference]: With dead ends: 28 [2021-05-02 13:29:37,759 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 13:29:37,760 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 193.7ms TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:29:37,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 13:29:37,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 13:29:37,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:37,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2021-05-02 13:29:37,764 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2021-05-02 13:29:37,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:37,764 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2021-05-02 13:29:37,765 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:37,765 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2021-05-02 13:29:37,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:29:37,765 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:37,765 INFO L523 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:37,980 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-05-02 13:29:37,981 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:37,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:37,981 INFO L82 PathProgramCache]: Analyzing trace with hash 1606628890, now seen corresponding path program 8 times [2021-05-02 13:29:37,981 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:37,981 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22950314] [2021-05-02 13:29:37,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:38,004 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:38,004 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [957420184] [2021-05-02 13:29:38,004 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 [2021-05-02 13:29:38,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:29:38,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:38,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 13:29:38,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:38,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:38,376 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:38,377 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:38,377 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22950314] [2021-05-02 13:29:38,377 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:38,377 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957420184] [2021-05-02 13:29:38,377 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957420184] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:38,377 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:38,377 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 13:29:38,377 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92608693] [2021-05-02 13:29:38,378 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:29:38,378 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:38,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:29:38,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:29:38,378 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand has 15 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:38,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:38,548 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2021-05-02 13:29:38,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:29:38,548 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 13:29:38,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:38,549 INFO L225 Difference]: With dead ends: 29 [2021-05-02 13:29:38,549 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 13:29:38,549 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 180.8ms TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:29:38,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 13:29:38,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 13:29:38,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:38,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2021-05-02 13:29:38,553 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2021-05-02 13:29:38,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:38,553 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2021-05-02 13:29:38,553 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:38,553 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2021-05-02 13:29:38,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:29:38,554 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:38,554 INFO L523 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:38,777 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:38,777 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:38,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:38,777 INFO L82 PathProgramCache]: Analyzing trace with hash -209053989, now seen corresponding path program 9 times [2021-05-02 13:29:38,778 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:38,778 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333097969] [2021-05-02 13:29:38,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:38,790 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:38,791 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [570542560] [2021-05-02 13:29:38,791 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 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 [2021-05-02 13:29:39,381 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 13:29:39,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:39,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 13:29:39,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:39,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:39,631 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:39,631 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:39,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333097969] [2021-05-02 13:29:39,631 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:39,632 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [570542560] [2021-05-02 13:29:39,632 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [570542560] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:39,632 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:39,632 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 13:29:39,632 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674805638] [2021-05-02 13:29:39,632 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:29:39,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:39,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:29:39,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:29:39,633 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 16 states, 16 states have (on average 1.125) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:39,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:39,799 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2021-05-02 13:29:39,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:29:39,800 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.125) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 13:29:39,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:39,800 INFO L225 Difference]: With dead ends: 30 [2021-05-02 13:29:39,800 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 13:29:39,801 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 205.9ms TimeCoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:29:39,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 13:29:39,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 13:29:39,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:39,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2021-05-02 13:29:39,804 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2021-05-02 13:29:39,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:39,804 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2021-05-02 13:29:39,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.125) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:39,804 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2021-05-02 13:29:39,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 13:29:39,805 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:39,805 INFO L523 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:40,009 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:40,009 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:40,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:40,010 INFO L82 PathProgramCache]: Analyzing trace with hash -660648390, now seen corresponding path program 10 times [2021-05-02 13:29:40,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:40,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096564053] [2021-05-02 13:29:40,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:40,022 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:40,022 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [405178124] [2021-05-02 13:29:40,022 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 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 [2021-05-02 13:29:40,269 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:29:40,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:40,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 13:29:40,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:40,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:40,546 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:40,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:40,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2096564053] [2021-05-02 13:29:40,547 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:40,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405178124] [2021-05-02 13:29:40,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405178124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:40,547 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:40,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-05-02 13:29:40,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935425043] [2021-05-02 13:29:40,547 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:29:40,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:40,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:29:40,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:29:40,548 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 17 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:40,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:40,747 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2021-05-02 13:29:40,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 13:29:40,747 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 13:29:40,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:40,750 INFO L225 Difference]: With dead ends: 31 [2021-05-02 13:29:40,750 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 13:29:40,750 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 227.9ms TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:29:40,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 13:29:40,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-02 13:29:40,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:40,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2021-05-02 13:29:40,756 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2021-05-02 13:29:40,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:40,756 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2021-05-02 13:29:40,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:40,756 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2021-05-02 13:29:40,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 13:29:40,757 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:40,757 INFO L523 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:40,972 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 13:29:40,973 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:40,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:40,973 INFO L82 PathProgramCache]: Analyzing trace with hash -1775172933, now seen corresponding path program 11 times [2021-05-02 13:29:40,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:40,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121045036] [2021-05-02 13:29:40,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:40,989 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:40,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [648927066] [2021-05-02 13:29:40,989 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 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 [2021-05-02 13:29:41,223 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-02 13:29:41,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:41,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-02 13:29:41,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:41,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:41,573 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:41,574 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:41,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121045036] [2021-05-02 13:29:41,574 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:41,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648927066] [2021-05-02 13:29:41,574 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648927066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:41,574 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:41,574 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-05-02 13:29:41,574 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095936988] [2021-05-02 13:29:41,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:29:41,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:41,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:29:41,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:29:41,576 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 16 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:41,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:41,782 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2021-05-02 13:29:41,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:29:41,782 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 16 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-02 13:29:41,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:41,783 INFO L225 Difference]: With dead ends: 32 [2021-05-02 13:29:41,783 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 13:29:41,784 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 287.4ms TimeCoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:29:41,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 13:29:41,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 13:29:41,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:41,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2021-05-02 13:29:41,793 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2021-05-02 13:29:41,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:41,793 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2021-05-02 13:29:41,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 16 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:41,793 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2021-05-02 13:29:41,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 13:29:41,797 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:41,797 INFO L523 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:42,001 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:42,001 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:42,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:42,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1965695398, now seen corresponding path program 12 times [2021-05-02 13:29:42,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:42,002 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1348204490] [2021-05-02 13:29:42,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:42,011 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:42,011 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [762618551] [2021-05-02 13:29:42,011 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 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 [2021-05-02 13:29:42,426 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 13:29:42,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:42,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 13:29:42,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:42,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:42,742 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:42,742 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:42,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1348204490] [2021-05-02 13:29:42,742 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:42,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762618551] [2021-05-02 13:29:42,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762618551] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:42,742 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:42,742 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-05-02 13:29:42,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631860635] [2021-05-02 13:29:42,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:29:42,743 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:42,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:29:42,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:29:42,744 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand has 19 states, 19 states have (on average 1.105263157894737) internal successors, (21), 17 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:42,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:42,963 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2021-05-02 13:29:42,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:29:42,964 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.105263157894737) internal successors, (21), 17 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 13:29:42,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:42,967 INFO L225 Difference]: With dead ends: 33 [2021-05-02 13:29:42,967 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:29:42,967 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 260.3ms TimeCoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:29:42,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:29:42,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 13:29:42,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:42,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2021-05-02 13:29:42,980 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2021-05-02 13:29:42,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:42,980 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2021-05-02 13:29:42,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.105263157894737) internal successors, (21), 17 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:42,980 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2021-05-02 13:29:42,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 13:29:42,980 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:42,981 INFO L523 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:43,181 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 13:29:43,181 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:43,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:43,182 INFO L82 PathProgramCache]: Analyzing trace with hash 718042779, now seen corresponding path program 13 times [2021-05-02 13:29:43,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:43,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327509507] [2021-05-02 13:29:43,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:43,193 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:43,193 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [269183683] [2021-05-02 13:29:43,193 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 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 [2021-05-02 13:29:43,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:43,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 13:29:43,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:43,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:43,668 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:43,668 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:43,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327509507] [2021-05-02 13:29:43,668 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:43,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269183683] [2021-05-02 13:29:43,669 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269183683] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:43,669 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:43,669 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-05-02 13:29:43,669 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456751477] [2021-05-02 13:29:43,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 13:29:43,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:43,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 13:29:43,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:29:43,670 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 20 states, 20 states have (on average 1.1) internal successors, (22), 18 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:43,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:43,937 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2021-05-02 13:29:43,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:29:43,937 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.1) internal successors, (22), 18 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 13:29:43,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:43,938 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:29:43,938 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:29:43,938 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 295.7ms TimeCoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:29:43,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:29:43,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 13:29:43,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:43,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2021-05-02 13:29:43,941 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2021-05-02 13:29:43,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:43,941 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2021-05-02 13:29:43,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.1) internal successors, (22), 18 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:43,941 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2021-05-02 13:29:43,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:29:43,942 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:43,942 INFO L523 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:44,149 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:44,149 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:44,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:44,149 INFO L82 PathProgramCache]: Analyzing trace with hash -1985419654, now seen corresponding path program 14 times [2021-05-02 13:29:44,150 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:44,150 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135059432] [2021-05-02 13:29:44,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:44,159 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:44,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1805557383] [2021-05-02 13:29:44,159 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 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 [2021-05-02 13:29:44,411 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:29:44,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:44,413 WARN L261 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-02 13:29:44,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:44,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:44,738 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:44,738 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:44,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135059432] [2021-05-02 13:29:44,739 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:44,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1805557383] [2021-05-02 13:29:44,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1805557383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:44,739 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:44,739 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-05-02 13:29:44,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49640595] [2021-05-02 13:29:44,739 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 13:29:44,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:44,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 13:29:44,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:29:44,740 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand has 21 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 19 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:44,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:44,987 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2021-05-02 13:29:44,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:29:44,988 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 19 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 13:29:44,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:44,988 INFO L225 Difference]: With dead ends: 35 [2021-05-02 13:29:44,988 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 13:29:44,989 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 275.8ms TimeCoverageRelationStatistics Valid=66, Invalid=440, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:29:44,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 13:29:44,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 13:29:44,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:44,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2021-05-02 13:29:44,991 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2021-05-02 13:29:44,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:44,992 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2021-05-02 13:29:44,992 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 19 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:44,992 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2021-05-02 13:29:44,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:29:44,992 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:44,992 INFO L523 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:45,205 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:29:45,205 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:45,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:45,206 INFO L82 PathProgramCache]: Analyzing trace with hash 106590843, now seen corresponding path program 15 times [2021-05-02 13:29:45,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:45,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242818711] [2021-05-02 13:29:45,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:45,220 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:45,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [20377216] [2021-05-02 13:29:45,221 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 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 [2021-05-02 13:29:45,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-05-02 13:29:45,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:45,689 WARN L261 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 104 conjunts are in the unsatisfiable core [2021-05-02 13:29:45,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:46,041 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:46,042 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:46,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242818711] [2021-05-02 13:29:46,042 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:46,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20377216] [2021-05-02 13:29:46,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [20377216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:46,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:46,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-05-02 13:29:46,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786394126] [2021-05-02 13:29:46,043 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 13:29:46,043 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:46,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 13:29:46,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=365, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:29:46,044 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 19 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:46,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:46,310 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2021-05-02 13:29:46,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:29:46,311 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 19 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 13:29:46,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:46,311 INFO L225 Difference]: With dead ends: 36 [2021-05-02 13:29:46,311 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 13:29:46,312 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 280.5ms TimeCoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:29:46,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 13:29:46,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 13:29:46,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:46,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2021-05-02 13:29:46,317 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2021-05-02 13:29:46,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:46,317 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2021-05-02 13:29:46,317 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 19 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:46,317 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2021-05-02 13:29:46,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 13:29:46,317 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:46,318 INFO L523 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:46,525 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 13:29:46,525 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:46,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:46,525 INFO L82 PathProgramCache]: Analyzing trace with hash 534406810, now seen corresponding path program 16 times [2021-05-02 13:29:46,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:46,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77721902] [2021-05-02 13:29:46,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:46,541 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:46,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [557806455] [2021-05-02 13:29:46,542 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 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 [2021-05-02 13:29:46,618 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:29:46,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:46,620 WARN L261 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 113 conjunts are in the unsatisfiable core [2021-05-02 13:29:46,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:47,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:47,139 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:47,139 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:47,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77721902] [2021-05-02 13:29:47,140 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:47,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557806455] [2021-05-02 13:29:47,140 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [557806455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:47,140 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:47,140 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-05-02 13:29:47,140 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453517034] [2021-05-02 13:29:47,141 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 13:29:47,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:47,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 13:29:47,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:29:47,144 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand has 23 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 21 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:47,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:47,461 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2021-05-02 13:29:47,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:29:47,461 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 21 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 13:29:47,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:47,461 INFO L225 Difference]: With dead ends: 37 [2021-05-02 13:29:47,461 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 13:29:47,462 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 433.9ms TimeCoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:29:47,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 13:29:47,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-02 13:29:47,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:47,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2021-05-02 13:29:47,465 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2021-05-02 13:29:47,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:47,465 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2021-05-02 13:29:47,465 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 21 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:47,465 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2021-05-02 13:29:47,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 13:29:47,466 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:47,466 INFO L523 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:47,680 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 13:29:47,681 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:47,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:47,681 INFO L82 PathProgramCache]: Analyzing trace with hash 911799899, now seen corresponding path program 17 times [2021-05-02 13:29:47,681 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:47,682 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105437411] [2021-05-02 13:29:47,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:47,698 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:47,699 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [334075677] [2021-05-02 13:29:47,699 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 [2021-05-02 13:29:47,987 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 13:29:47,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:47,990 WARN L261 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 119 conjunts are in the unsatisfiable core [2021-05-02 13:29:47,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:48,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:48,449 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:48,449 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:48,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105437411] [2021-05-02 13:29:48,450 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:48,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334075677] [2021-05-02 13:29:48,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334075677] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:48,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:48,451 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2021-05-02 13:29:48,453 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169950251] [2021-05-02 13:29:48,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:29:48,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:48,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:29:48,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:29:48,457 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:48,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:48,849 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2021-05-02 13:29:48,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:29:48,849 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 13:29:48,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:48,850 INFO L225 Difference]: With dead ends: 38 [2021-05-02 13:29:48,850 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:29:48,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 386.0ms TimeCoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:29:48,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:29:48,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 13:29:48,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:48,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2021-05-02 13:29:48,854 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2021-05-02 13:29:48,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:48,854 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2021-05-02 13:29:48,854 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:48,854 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2021-05-02 13:29:48,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:29:48,854 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:48,855 INFO L523 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:49,055 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:29:49,055 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:49,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:49,056 INFO L82 PathProgramCache]: Analyzing trace with hash -273916230, now seen corresponding path program 18 times [2021-05-02 13:29:49,056 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:49,056 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346595500] [2021-05-02 13:29:49,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:49,065 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:49,066 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1932675121] [2021-05-02 13:29:49,066 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 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 [2021-05-02 13:29:49,750 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-05-02 13:29:49,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:49,759 WARN L261 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 127 conjunts are in the unsatisfiable core [2021-05-02 13:29:49,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:50,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:50,451 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:50,451 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:50,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346595500] [2021-05-02 13:29:50,452 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:50,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932675121] [2021-05-02 13:29:50,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932675121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:50,452 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:50,452 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2021-05-02 13:29:50,452 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223706278] [2021-05-02 13:29:50,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:29:50,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:50,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:29:50,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:29:50,455 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 24 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:50,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:50,870 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2021-05-02 13:29:50,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 13:29:50,871 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.08) internal successors, (27), 24 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 13:29:50,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:50,872 INFO L225 Difference]: With dead ends: 39 [2021-05-02 13:29:50,872 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 13:29:50,872 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 571.9ms TimeCoverageRelationStatistics Valid=83, Invalid=673, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:29:50,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 13:29:50,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-02 13:29:50,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:50,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2021-05-02 13:29:50,875 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2021-05-02 13:29:50,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:50,876 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2021-05-02 13:29:50,876 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.08) internal successors, (27), 24 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:50,876 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2021-05-02 13:29:50,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:29:50,876 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:50,877 INFO L523 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:51,080 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:51,081 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:51,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:51,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1623589435, now seen corresponding path program 19 times [2021-05-02 13:29:51,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:51,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743950662] [2021-05-02 13:29:51,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:51,091 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:51,091 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [249597096] [2021-05-02 13:29:51,092 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 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 [2021-05-02 13:29:51,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:29:51,216 WARN L261 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 130 conjunts are in the unsatisfiable core [2021-05-02 13:29:51,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:51,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:51,715 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:51,716 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:51,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743950662] [2021-05-02 13:29:51,716 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:51,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249597096] [2021-05-02 13:29:51,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [249597096] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:51,716 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:51,716 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2021-05-02 13:29:51,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638640533] [2021-05-02 13:29:51,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:29:51,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:51,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:29:51,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:29:51,717 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 26 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 24 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:52,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:52,097 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2021-05-02 13:29:52,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:29:52,098 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 24 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 13:29:52,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:52,098 INFO L225 Difference]: With dead ends: 40 [2021-05-02 13:29:52,098 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 13:29:52,099 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 440.8ms TimeCoverageRelationStatistics Valid=81, Invalid=675, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:29:52,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 13:29:52,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 13:29:52,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:52,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2021-05-02 13:29:52,101 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2021-05-02 13:29:52,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:52,102 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2021-05-02 13:29:52,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 24 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:52,102 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2021-05-02 13:29:52,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 13:29:52,102 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:52,102 INFO L523 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:52,303 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:52,303 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:52,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:52,303 INFO L82 PathProgramCache]: Analyzing trace with hash 316722906, now seen corresponding path program 20 times [2021-05-02 13:29:52,303 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:52,304 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567183547] [2021-05-02 13:29:52,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:52,313 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:52,314 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2096873982] [2021-05-02 13:29:52,314 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 [2021-05-02 13:29:52,539 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:29:52,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:52,543 WARN L261 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 136 conjunts are in the unsatisfiable core [2021-05-02 13:29:52,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:53,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:53,065 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:53,065 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:53,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567183547] [2021-05-02 13:29:53,065 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:53,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096873982] [2021-05-02 13:29:53,065 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096873982] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:53,065 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:53,065 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2021-05-02 13:29:53,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599408659] [2021-05-02 13:29:53,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:29:53,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:53,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:29:53,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:29:53,066 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand has 27 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 25 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:53,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:53,404 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2021-05-02 13:29:53,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:29:53,404 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 25 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 13:29:53,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:53,405 INFO L225 Difference]: With dead ends: 41 [2021-05-02 13:29:53,405 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 13:29:53,405 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 451.2ms TimeCoverageRelationStatistics Valid=84, Invalid=728, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:29:53,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 13:29:53,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 13:29:53,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:53,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2021-05-02 13:29:53,408 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2021-05-02 13:29:53,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:53,408 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2021-05-02 13:29:53,409 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 25 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:53,409 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2021-05-02 13:29:53,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:29:53,409 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:53,409 INFO L523 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:53,625 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 13:29:53,625 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:53,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:53,625 INFO L82 PathProgramCache]: Analyzing trace with hash -1541433829, now seen corresponding path program 21 times [2021-05-02 13:29:53,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:53,626 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329658252] [2021-05-02 13:29:53,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:53,635 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:53,636 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1428900785] [2021-05-02 13:29:53,636 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 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 [2021-05-02 13:29:55,618 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-05-02 13:29:55,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:55,624 WARN L261 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 147 conjunts are in the unsatisfiable core [2021-05-02 13:29:55,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:56,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:56,413 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:56,414 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:56,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329658252] [2021-05-02 13:29:56,414 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:56,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428900785] [2021-05-02 13:29:56,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1428900785] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:56,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:56,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2021-05-02 13:29:56,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393971226] [2021-05-02 13:29:56,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:29:56,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:56,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:29:56,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:29:56,415 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand has 28 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 26 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:56,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:56,819 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2021-05-02 13:29:56,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:29:56,820 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 26 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:29:56,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:56,820 INFO L225 Difference]: With dead ends: 42 [2021-05-02 13:29:56,820 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 13:29:56,821 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 725.4ms TimeCoverageRelationStatistics Valid=87, Invalid=783, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:29:56,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 13:29:56,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 13:29:56,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:56,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2021-05-02 13:29:56,824 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2021-05-02 13:29:56,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:56,824 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2021-05-02 13:29:56,824 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 26 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:56,824 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2021-05-02 13:29:56,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 13:29:56,824 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:56,825 INFO L523 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:57,030 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:57,031 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:57,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:57,031 INFO L82 PathProgramCache]: Analyzing trace with hash 985249530, now seen corresponding path program 22 times [2021-05-02 13:29:57,031 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:57,031 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973856406] [2021-05-02 13:29:57,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:57,041 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:57,041 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [943255951] [2021-05-02 13:29:57,041 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 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 [2021-05-02 13:29:57,141 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:29:57,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:57,144 WARN L261 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 148 conjunts are in the unsatisfiable core [2021-05-02 13:29:57,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:29:57,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:29:57,687 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:29:57,688 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:29:57,688 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973856406] [2021-05-02 13:29:57,688 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:29:57,688 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [943255951] [2021-05-02 13:29:57,688 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [943255951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:29:57,688 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:29:57,688 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2021-05-02 13:29:57,688 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137281295] [2021-05-02 13:29:57,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 13:29:57,688 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:29:57,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 13:29:57,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:29:57,689 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand has 29 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 27 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:58,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:29:58,075 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2021-05-02 13:29:58,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:29:58,076 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 27 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 13:29:58,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:29:58,076 INFO L225 Difference]: With dead ends: 43 [2021-05-02 13:29:58,076 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 13:29:58,077 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 486.0ms TimeCoverageRelationStatistics Valid=90, Invalid=840, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:29:58,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 13:29:58,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-02 13:29:58,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:58,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2021-05-02 13:29:58,080 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2021-05-02 13:29:58,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:29:58,080 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2021-05-02 13:29:58,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 27 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:29:58,080 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2021-05-02 13:29:58,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 13:29:58,080 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:29:58,080 INFO L523 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:29:58,300 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 13:29:58,301 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:29:58,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:29:58,301 INFO L82 PathProgramCache]: Analyzing trace with hash 2003022331, now seen corresponding path program 23 times [2021-05-02 13:29:58,301 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:29:58,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727935357] [2021-05-02 13:29:58,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:29:58,310 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:29:58,311 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1240065138] [2021-05-02 13:29:58,311 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:29:59,546 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 13:29:59,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:29:59,552 WARN L261 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 154 conjunts are in the unsatisfiable core [2021-05-02 13:29:59,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:00,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:00,169 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:00,169 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:00,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727935357] [2021-05-02 13:30:00,169 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:00,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240065138] [2021-05-02 13:30:00,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240065138] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:00,169 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:00,169 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2021-05-02 13:30:00,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295666333] [2021-05-02 13:30:00,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 13:30:00,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:00,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 13:30:00,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:30:00,171 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand has 30 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 28 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:00,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:00,647 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2021-05-02 13:30:00,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:30:00,648 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 28 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 13:30:00,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:00,648 INFO L225 Difference]: With dead ends: 44 [2021-05-02 13:30:00,648 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 13:30:00,649 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 550.7ms TimeCoverageRelationStatistics Valid=93, Invalid=899, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:30:00,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 13:30:00,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 13:30:00,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 33 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:00,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2021-05-02 13:30:00,651 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2021-05-02 13:30:00,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:00,651 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2021-05-02 13:30:00,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 28 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:00,651 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2021-05-02 13:30:00,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 13:30:00,651 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:00,652 INFO L523 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:00,855 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:00,856 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:00,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:00,856 INFO L82 PathProgramCache]: Analyzing trace with hash -805759206, now seen corresponding path program 24 times [2021-05-02 13:30:00,856 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:00,856 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702151378] [2021-05-02 13:30:00,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:00,865 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:00,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [879693717] [2021-05-02 13:30:00,865 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:04,727 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 13:30:04,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:04,736 WARN L261 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 160 conjunts are in the unsatisfiable core [2021-05-02 13:30:04,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:05,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:05,316 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:05,316 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:05,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702151378] [2021-05-02 13:30:05,316 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:05,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879693717] [2021-05-02 13:30:05,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879693717] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:05,317 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:05,317 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2021-05-02 13:30:05,317 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948787165] [2021-05-02 13:30:05,317 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:30:05,317 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:05,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:30:05,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:30:05,318 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand has 31 states, 31 states have (on average 1.064516129032258) internal successors, (33), 29 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:05,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:05,769 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2021-05-02 13:30:05,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:30:05,770 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.064516129032258) internal successors, (33), 29 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 13:30:05,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:05,770 INFO L225 Difference]: With dead ends: 45 [2021-05-02 13:30:05,770 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 13:30:05,771 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 538.9ms TimeCoverageRelationStatistics Valid=96, Invalid=960, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:30:05,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 13:30:05,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-02 13:30:05,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:05,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2021-05-02 13:30:05,773 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2021-05-02 13:30:05,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:05,774 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2021-05-02 13:30:05,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.064516129032258) internal successors, (33), 29 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:05,774 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2021-05-02 13:30:05,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:30:05,774 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:05,774 INFO L523 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:05,981 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 13:30:05,982 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:05,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:05,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1978640933, now seen corresponding path program 25 times [2021-05-02 13:30:05,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:05,982 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616010363] [2021-05-02 13:30:05,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:05,993 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:05,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [69761124] [2021-05-02 13:30:05,993 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:06,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:06,144 WARN L261 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 164 conjunts are in the unsatisfiable core [2021-05-02 13:30:06,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:06,772 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:06,772 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:06,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616010363] [2021-05-02 13:30:06,773 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:06,773 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69761124] [2021-05-02 13:30:06,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69761124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:06,774 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:06,774 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2021-05-02 13:30:06,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684274924] [2021-05-02 13:30:06,776 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:30:06,776 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:06,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:30:06,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=845, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:30:06,779 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 29 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:07,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:07,350 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2021-05-02 13:30:07,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:30:07,352 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 29 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 13:30:07,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:07,352 INFO L225 Difference]: With dead ends: 46 [2021-05-02 13:30:07,352 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 13:30:07,353 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 565.5ms TimeCoverageRelationStatistics Valid=95, Invalid=961, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:30:07,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 13:30:07,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-02 13:30:07,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 35 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:07,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2021-05-02 13:30:07,356 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2021-05-02 13:30:07,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:07,356 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2021-05-02 13:30:07,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 29 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:07,356 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2021-05-02 13:30:07,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 13:30:07,356 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:07,357 INFO L523 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:07,580 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 13:30:07,580 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:07,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:07,581 INFO L82 PathProgramCache]: Analyzing trace with hash 316731194, now seen corresponding path program 26 times [2021-05-02 13:30:07,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:07,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46671299] [2021-05-02 13:30:07,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:07,590 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:07,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1795140372] [2021-05-02 13:30:07,590 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:07,829 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:30:07,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:07,832 WARN L261 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 173 conjunts are in the unsatisfiable core [2021-05-02 13:30:07,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:08,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:08,714 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:08,714 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:08,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46671299] [2021-05-02 13:30:08,714 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:08,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1795140372] [2021-05-02 13:30:08,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1795140372] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:08,714 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:08,714 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2021-05-02 13:30:08,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115744434] [2021-05-02 13:30:08,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:30:08,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:08,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:30:08,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:30:08,716 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:09,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:09,255 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2021-05-02 13:30:09,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:30:09,256 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 13:30:09,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:09,256 INFO L225 Difference]: With dead ends: 47 [2021-05-02 13:30:09,256 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 13:30:09,257 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 832.8ms TimeCoverageRelationStatistics Valid=107, Invalid=1153, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:30:09,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 13:30:09,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-05-02 13:30:09,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:09,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2021-05-02 13:30:09,259 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2021-05-02 13:30:09,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:09,259 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2021-05-02 13:30:09,259 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:09,259 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2021-05-02 13:30:09,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:30:09,259 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:09,259 INFO L523 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:09,460 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 13:30:09,461 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:09,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:09,461 INFO L82 PathProgramCache]: Analyzing trace with hash -1541176901, now seen corresponding path program 27 times [2021-05-02 13:30:09,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:09,461 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039419256] [2021-05-02 13:30:09,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:09,471 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:09,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [297025686] [2021-05-02 13:30:09,471 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:11,258 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-05-02 13:30:11,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:11,265 WARN L261 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 182 conjunts are in the unsatisfiable core [2021-05-02 13:30:11,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:12,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:12,341 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:12,341 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:12,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039419256] [2021-05-02 13:30:12,341 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:12,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297025686] [2021-05-02 13:30:12,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297025686] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:12,342 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:12,342 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2021-05-02 13:30:12,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874971234] [2021-05-02 13:30:12,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:30:12,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:12,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:30:12,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:30:12,343 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand has 34 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 32 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:13,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:13,001 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2021-05-02 13:30:13,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:30:13,001 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 32 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 13:30:13,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:13,002 INFO L225 Difference]: With dead ends: 48 [2021-05-02 13:30:13,002 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 13:30:13,002 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1003.2ms TimeCoverageRelationStatistics Valid=105, Invalid=1155, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:30:13,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 13:30:13,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 13:30:13,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:13,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2021-05-02 13:30:13,005 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2021-05-02 13:30:13,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:13,006 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2021-05-02 13:30:13,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 32 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:13,006 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2021-05-02 13:30:13,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 13:30:13,006 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:13,006 INFO L523 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:13,212 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 13:30:13,212 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:13,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:13,213 INFO L82 PathProgramCache]: Analyzing trace with hash 993214298, now seen corresponding path program 28 times [2021-05-02 13:30:13,213 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:13,213 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734817095] [2021-05-02 13:30:13,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:13,223 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:13,223 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [279218528] [2021-05-02 13:30:13,224 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:13,351 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:30:13,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:13,354 WARN L261 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 184 conjunts are in the unsatisfiable core [2021-05-02 13:30:13,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:14,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:14,098 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:14,099 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:14,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734817095] [2021-05-02 13:30:14,099 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:14,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279218528] [2021-05-02 13:30:14,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279218528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:14,099 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:14,099 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2021-05-02 13:30:14,099 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509741797] [2021-05-02 13:30:14,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:30:14,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:14,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:30:14,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:30:14,101 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand has 35 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 33 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:14,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:14,675 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2021-05-02 13:30:14,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 13:30:14,676 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 33 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 13:30:14,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:14,676 INFO L225 Difference]: With dead ends: 49 [2021-05-02 13:30:14,676 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 13:30:14,677 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 699.2ms TimeCoverageRelationStatistics Valid=108, Invalid=1224, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:30:14,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 13:30:14,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 13:30:14,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:14,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2021-05-02 13:30:14,680 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2021-05-02 13:30:14,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:14,680 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2021-05-02 13:30:14,680 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 33 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:14,680 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2021-05-02 13:30:14,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:30:14,680 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:14,680 INFO L523 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:14,884 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 13:30:14,885 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:14,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:14,885 INFO L82 PathProgramCache]: Analyzing trace with hash -2045037157, now seen corresponding path program 29 times [2021-05-02 13:30:14,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:14,885 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803746861] [2021-05-02 13:30:14,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:14,895 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:14,895 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [604910073] [2021-05-02 13:30:14,895 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:17,768 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2021-05-02 13:30:17,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:17,777 WARN L261 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 190 conjunts are in the unsatisfiable core [2021-05-02 13:30:17,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:18,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:18,566 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:18,566 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:18,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803746861] [2021-05-02 13:30:18,566 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:18,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [604910073] [2021-05-02 13:30:18,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [604910073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:18,566 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:18,567 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2021-05-02 13:30:18,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292694657] [2021-05-02 13:30:18,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 13:30:18,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:18,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 13:30:18,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:30:18,568 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand has 36 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 34 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:19,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:19,242 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2021-05-02 13:30:19,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 13:30:19,242 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 34 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 13:30:19,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:19,243 INFO L225 Difference]: With dead ends: 50 [2021-05-02 13:30:19,243 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 13:30:19,243 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 735.3ms TimeCoverageRelationStatistics Valid=111, Invalid=1295, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:30:19,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 13:30:19,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 13:30:19,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:19,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2021-05-02 13:30:19,245 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2021-05-02 13:30:19,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:19,246 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2021-05-02 13:30:19,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 34 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:19,246 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2021-05-02 13:30:19,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:30:19,246 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:19,246 INFO L523 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:19,446 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:19,447 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:19,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:19,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1741551750, now seen corresponding path program 30 times [2021-05-02 13:30:19,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:19,447 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674770878] [2021-05-02 13:30:19,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:19,456 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:19,456 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [869041366] [2021-05-02 13:30:19,456 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:23,077 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2021-05-02 13:30:23,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:23,085 WARN L261 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 197 conjunts are in the unsatisfiable core [2021-05-02 13:30:23,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:23,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:23,985 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:23,985 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:23,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674770878] [2021-05-02 13:30:23,985 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:23,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869041366] [2021-05-02 13:30:23,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869041366] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:23,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:23,986 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2021-05-02 13:30:23,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94653929] [2021-05-02 13:30:23,986 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 13:30:23,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:23,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 13:30:23,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:30:23,987 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 36 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:24,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:24,697 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2021-05-02 13:30:24,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 13:30:24,698 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 36 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 13:30:24,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:24,698 INFO L225 Difference]: With dead ends: 51 [2021-05-02 13:30:24,698 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 13:30:24,699 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 825.1ms TimeCoverageRelationStatistics Valid=119, Invalid=1441, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:30:24,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 13:30:24,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 13:30:24,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:24,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2021-05-02 13:30:24,702 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2021-05-02 13:30:24,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:24,702 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2021-05-02 13:30:24,702 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 36 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:24,702 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2021-05-02 13:30:24,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:30:24,702 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:24,703 INFO L523 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:24,909 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:24,909 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:24,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:24,909 INFO L82 PathProgramCache]: Analyzing trace with hash -923438725, now seen corresponding path program 31 times [2021-05-02 13:30:24,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:24,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618842647] [2021-05-02 13:30:24,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:24,920 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:24,920 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [666412908] [2021-05-02 13:30:24,920 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:25,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:30:25,048 WARN L261 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 202 conjunts are in the unsatisfiable core [2021-05-02 13:30:25,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:25,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:25,875 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:25,875 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:25,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618842647] [2021-05-02 13:30:25,875 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:25,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666412908] [2021-05-02 13:30:25,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666412908] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:25,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:25,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2021-05-02 13:30:25,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9761724] [2021-05-02 13:30:25,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 13:30:25,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:25,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 13:30:25,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:30:25,877 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand has 38 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 36 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:26,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:26,556 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2021-05-02 13:30:26,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:30:26,557 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 36 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 13:30:26,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:26,557 INFO L225 Difference]: With dead ends: 52 [2021-05-02 13:30:26,557 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 13:30:26,558 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 778.5ms TimeCoverageRelationStatistics Valid=117, Invalid=1443, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:30:26,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 13:30:26,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 13:30:26,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.024390243902439) internal successors, (42), 41 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:26,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2021-05-02 13:30:26,561 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2021-05-02 13:30:26,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:26,561 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2021-05-02 13:30:26,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 36 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:26,561 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2021-05-02 13:30:26,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:30:26,562 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:26,562 INFO L523 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:26,764 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-02 13:30:26,765 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:26,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:26,766 INFO L82 PathProgramCache]: Analyzing trace with hash -1331738726, now seen corresponding path program 32 times [2021-05-02 13:30:26,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:26,766 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720181812] [2021-05-02 13:30:26,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:26,775 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:26,775 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1376000565] [2021-05-02 13:30:26,775 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:26,971 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:30:26,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:26,974 WARN L261 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 208 conjunts are in the unsatisfiable core [2021-05-02 13:30:26,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:27,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:27,922 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:27,922 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:27,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720181812] [2021-05-02 13:30:27,922 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:27,923 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1376000565] [2021-05-02 13:30:27,923 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1376000565] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:27,923 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:27,923 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2021-05-02 13:30:27,923 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782803010] [2021-05-02 13:30:27,923 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 13:30:27,923 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:27,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 13:30:27,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:30:27,924 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand has 39 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 37 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:28,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:28,661 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2021-05-02 13:30:28,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 13:30:28,661 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 37 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 13:30:28,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:28,662 INFO L225 Difference]: With dead ends: 53 [2021-05-02 13:30:28,662 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 13:30:28,662 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 886.0ms TimeCoverageRelationStatistics Valid=120, Invalid=1520, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:30:28,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 13:30:28,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-02 13:30:28,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:28,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2021-05-02 13:30:28,665 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2021-05-02 13:30:28,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:28,665 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2021-05-02 13:30:28,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 37 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:28,666 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2021-05-02 13:30:28,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 13:30:28,666 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:28,666 INFO L523 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:28,876 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:28,877 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:28,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:28,877 INFO L82 PathProgramCache]: Analyzing trace with hash -1104136869, now seen corresponding path program 33 times [2021-05-02 13:30:28,877 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:28,877 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871470510] [2021-05-02 13:30:28,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:28,886 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:28,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1256829963] [2021-05-02 13:30:28,886 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:35,780 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 13:30:35,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:35,796 WARN L261 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 215 conjunts are in the unsatisfiable core [2021-05-02 13:30:35,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:36,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:36,797 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:36,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:36,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871470510] [2021-05-02 13:30:36,797 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:36,798 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256829963] [2021-05-02 13:30:36,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256829963] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:36,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:36,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2021-05-02 13:30:36,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047696769] [2021-05-02 13:30:36,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:30:36,798 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:36,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:30:36,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:30:36,799 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand has 41 states, 40 states have (on average 1.05) internal successors, (42), 39 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:37,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:37,570 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2021-05-02 13:30:37,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 13:30:37,570 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.05) internal successors, (42), 39 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-02 13:30:37,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:37,571 INFO L225 Difference]: With dead ends: 54 [2021-05-02 13:30:37,571 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 13:30:37,572 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 930.8ms TimeCoverageRelationStatistics Valid=128, Invalid=1678, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:30:37,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 13:30:37,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-02 13:30:37,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 43 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:37,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2021-05-02 13:30:37,574 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2021-05-02 13:30:37,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:37,574 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2021-05-02 13:30:37,574 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 40 states have (on average 1.05) internal successors, (42), 39 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:37,574 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2021-05-02 13:30:37,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 13:30:37,575 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:37,575 INFO L523 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:37,775 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 13:30:37,775 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:37,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:37,776 INFO L82 PathProgramCache]: Analyzing trace with hash 1656553402, now seen corresponding path program 34 times [2021-05-02 13:30:37,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:37,776 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368071278] [2021-05-02 13:30:37,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:37,786 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:37,786 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [171623260] [2021-05-02 13:30:37,787 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:37,931 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:30:37,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:30:37,935 WARN L261 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 220 conjunts are in the unsatisfiable core [2021-05-02 13:30:37,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:30:38,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:30:38,856 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:30:38,856 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:30:38,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368071278] [2021-05-02 13:30:38,856 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:30:38,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171623260] [2021-05-02 13:30:38,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171623260] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:30:38,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:30:38,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2021-05-02 13:30:38,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514948189] [2021-05-02 13:30:38,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:30:38,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:30:38,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:30:38,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:30:38,858 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand has 41 states, 41 states have (on average 1.048780487804878) internal successors, (43), 39 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:39,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:30:39,658 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2021-05-02 13:30:39,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 13:30:39,658 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.048780487804878) internal successors, (43), 39 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 13:30:39,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:30:39,659 INFO L225 Difference]: With dead ends: 55 [2021-05-02 13:30:39,659 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 13:30:39,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 868.1ms TimeCoverageRelationStatistics Valid=126, Invalid=1680, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:30:39,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 13:30:39,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-02 13:30:39,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:39,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2021-05-02 13:30:39,662 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2021-05-02 13:30:39,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:30:39,662 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2021-05-02 13:30:39,662 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.048780487804878) internal successors, (43), 39 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:30:39,662 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2021-05-02 13:30:39,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 13:30:39,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:30:39,662 INFO L523 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:30:39,876 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:30:39,877 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:30:39,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:30:39,877 INFO L82 PathProgramCache]: Analyzing trace with hash 1338605883, now seen corresponding path program 35 times [2021-05-02 13:30:39,877 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:30:39,877 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909631918] [2021-05-02 13:30:39,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:30:39,890 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:30:39,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [352414352] [2021-05-02 13:30:39,890 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:19,535 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2021-05-02 13:31:19,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:19,579 WARN L261 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 225 conjunts are in the unsatisfiable core [2021-05-02 13:31:19,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:20,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:20,474 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:31:20,474 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:20,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909631918] [2021-05-02 13:31:20,474 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:31:20,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352414352] [2021-05-02 13:31:20,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352414352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:20,474 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:31:20,474 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2021-05-02 13:31:20,474 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959023560] [2021-05-02 13:31:20,475 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:31:20,475 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:20,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:31:20,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1525, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:31:20,476 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 39 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:21,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:21,302 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2021-05-02 13:31:21,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 13:31:21,302 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 39 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2021-05-02 13:31:21,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:21,303 INFO L225 Difference]: With dead ends: 56 [2021-05-02 13:31:21,303 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 13:31:21,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 849.5ms TimeCoverageRelationStatistics Valid=125, Invalid=1681, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:31:21,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 13:31:21,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-02 13:31:21,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0222222222222221) internal successors, (46), 45 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:21,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2021-05-02 13:31:21,305 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2021-05-02 13:31:21,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:21,305 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2021-05-02 13:31:21,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 39 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:21,306 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2021-05-02 13:31:21,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 13:31:21,306 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:21,306 INFO L523 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:21,515 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 13:31:21,516 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:21,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:21,516 INFO L82 PathProgramCache]: Analyzing trace with hash 72167386, now seen corresponding path program 36 times [2021-05-02 13:31:21,516 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:21,516 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962272697] [2021-05-02 13:31:21,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:21,528 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:31:21,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [814636739] [2021-05-02 13:31:21,529 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:26,429 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 13:31:26,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:26,443 WARN L261 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 232 conjunts are in the unsatisfiable core [2021-05-02 13:31:26,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:27,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:27,507 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:31:27,507 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:27,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962272697] [2021-05-02 13:31:27,508 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:31:27,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814636739] [2021-05-02 13:31:27,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [814636739] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:27,508 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:31:27,508 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2021-05-02 13:31:27,508 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098660635] [2021-05-02 13:31:27,508 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:31:27,508 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:27,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:31:27,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:31:27,509 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand has 43 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 41 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:28,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:28,378 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2021-05-02 13:31:28,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 13:31:28,379 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 41 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 13:31:28,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:28,380 INFO L225 Difference]: With dead ends: 57 [2021-05-02 13:31:28,380 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 13:31:28,381 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 1012.7ms TimeCoverageRelationStatistics Valid=132, Invalid=1848, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:31:28,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 13:31:28,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-02 13:31:28,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:28,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2021-05-02 13:31:28,383 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2021-05-02 13:31:28,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:28,383 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2021-05-02 13:31:28,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 41 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:28,383 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2021-05-02 13:31:28,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:31:28,384 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:28,384 INFO L523 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:28,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 13:31:28,585 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:28,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:28,585 INFO L82 PathProgramCache]: Analyzing trace with hash -532720357, now seen corresponding path program 37 times [2021-05-02 13:31:28,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:28,585 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910183338] [2021-05-02 13:31:28,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:28,596 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:31:28,596 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1751889744] [2021-05-02 13:31:28,596 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:28,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:31:28,742 WARN L261 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 236 conjunts are in the unsatisfiable core [2021-05-02 13:31:28,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:29,719 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:31:29,720 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:29,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910183338] [2021-05-02 13:31:29,720 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:31:29,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751889744] [2021-05-02 13:31:29,720 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1751889744] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:29,720 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:31:29,720 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2021-05-02 13:31:29,720 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253829482] [2021-05-02 13:31:29,720 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:31:29,720 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:29,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:31:29,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1685, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:31:29,721 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 41 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:30,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:30,653 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2021-05-02 13:31:30,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 13:31:30,653 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 41 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 13:31:30,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:30,654 INFO L225 Difference]: With dead ends: 58 [2021-05-02 13:31:30,654 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 13:31:30,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 926.1ms TimeCoverageRelationStatistics Valid=131, Invalid=1849, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:31:30,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 13:31:30,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 13:31:30,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 47 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:30,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2021-05-02 13:31:30,657 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2021-05-02 13:31:30,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:30,657 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2021-05-02 13:31:30,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 41 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:30,658 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2021-05-02 13:31:30,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 13:31:30,658 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:30,658 INFO L523 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:30,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 13:31:30,861 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:30,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:30,861 INFO L82 PathProgramCache]: Analyzing trace with hash -2104371206, now seen corresponding path program 38 times [2021-05-02 13:31:30,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:30,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370722930] [2021-05-02 13:31:30,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:30,872 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:31:30,873 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1890367589] [2021-05-02 13:31:30,873 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:31,284 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:31:31,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:31,288 WARN L261 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 244 conjunts are in the unsatisfiable core [2021-05-02 13:31:31,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:32,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:32,428 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:31:32,429 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:32,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370722930] [2021-05-02 13:31:32,429 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:31:32,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890367589] [2021-05-02 13:31:32,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1890367589] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:32,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:31:32,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2021-05-02 13:31:32,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433913883] [2021-05-02 13:31:32,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 13:31:32,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:32,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 13:31:32,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:31:32,430 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand has 45 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 43 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:33,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:33,421 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2021-05-02 13:31:33,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 13:31:33,422 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 43 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 13:31:33,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:33,422 INFO L225 Difference]: With dead ends: 59 [2021-05-02 13:31:33,422 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 13:31:33,423 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 1077.7ms TimeCoverageRelationStatistics Valid=138, Invalid=2024, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:31:33,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 13:31:33,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 13:31:33,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:33,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2021-05-02 13:31:33,426 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2021-05-02 13:31:33,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:33,426 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2021-05-02 13:31:33,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 43 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:33,426 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2021-05-02 13:31:33,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 13:31:33,427 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:33,427 INFO L523 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:33,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 13:31:33,629 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:33,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:33,629 INFO L82 PathProgramCache]: Analyzing trace with hash 714060027, now seen corresponding path program 39 times [2021-05-02 13:31:33,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:33,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475552746] [2021-05-02 13:31:33,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:33,640 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:31:33,640 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2087065652] [2021-05-02 13:31:33,640 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:38,505 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-05-02 13:31:38,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:38,519 WARN L261 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 250 conjunts are in the unsatisfiable core [2021-05-02 13:31:38,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:39,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:39,720 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:31:39,720 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:39,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475552746] [2021-05-02 13:31:39,720 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:31:39,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087065652] [2021-05-02 13:31:39,720 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087065652] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:39,720 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:31:39,720 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2021-05-02 13:31:39,720 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992526013] [2021-05-02 13:31:39,721 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 13:31:39,721 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:39,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 13:31:39,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:31:39,722 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand has 46 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 44 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:40,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:40,762 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2021-05-02 13:31:40,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 13:31:40,763 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 44 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-02 13:31:40,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:40,763 INFO L225 Difference]: With dead ends: 60 [2021-05-02 13:31:40,763 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 13:31:40,764 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 1145.0ms TimeCoverageRelationStatistics Valid=141, Invalid=2115, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:31:40,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 13:31:40,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-02 13:31:40,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.0204081632653061) internal successors, (50), 49 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:40,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2021-05-02 13:31:40,766 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2021-05-02 13:31:40,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:40,766 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2021-05-02 13:31:40,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 44 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:40,766 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2021-05-02 13:31:40,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 13:31:40,767 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:40,767 INFO L523 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:40,967 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 13:31:40,967 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:40,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:40,968 INFO L82 PathProgramCache]: Analyzing trace with hash -2108884966, now seen corresponding path program 40 times [2021-05-02 13:31:40,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:40,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190251070] [2021-05-02 13:31:40,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:40,977 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:31:40,978 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [645070006] [2021-05-02 13:31:40,978 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:41,151 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:31:41,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:31:41,155 WARN L261 TraceCheckSpWp]: Trace formula consists of 379 conjuncts, 256 conjunts are in the unsatisfiable core [2021-05-02 13:31:41,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:31:42,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:31:42,392 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:31:42,392 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:31:42,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190251070] [2021-05-02 13:31:42,392 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:31:42,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645070006] [2021-05-02 13:31:42,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645070006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:31:42,392 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:31:42,392 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2021-05-02 13:31:42,393 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687180196] [2021-05-02 13:31:42,393 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:31:42,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:31:42,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:31:42,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:31:42,393 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand has 47 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 45 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:43,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:31:43,481 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2021-05-02 13:31:43,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 13:31:43,481 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 45 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 13:31:43,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:31:43,482 INFO L225 Difference]: With dead ends: 61 [2021-05-02 13:31:43,482 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 13:31:43,482 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 1170.9ms TimeCoverageRelationStatistics Valid=144, Invalid=2208, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:31:43,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 13:31:43,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 13:31:43,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:43,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2021-05-02 13:31:43,485 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2021-05-02 13:31:43,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:31:43,485 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2021-05-02 13:31:43,485 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 45 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:31:43,485 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2021-05-02 13:31:43,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 13:31:43,485 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:31:43,485 INFO L523 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:31:43,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,42 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:31:43,686 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:31:43,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:31:43,686 INFO L82 PathProgramCache]: Analyzing trace with hash 574133467, now seen corresponding path program 41 times [2021-05-02 13:31:43,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:31:43,686 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452409961] [2021-05-02 13:31:43,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:31:43,696 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:31:43,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1963399041] [2021-05-02 13:31:43,697 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:01,066 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2021-05-02 13:32:01,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:01,090 WARN L261 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 262 conjunts are in the unsatisfiable core [2021-05-02 13:32:01,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:02,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:02,572 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:32:02,572 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:02,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452409961] [2021-05-02 13:32:02,573 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:32:02,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963399041] [2021-05-02 13:32:02,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1963399041] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:02,573 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:32:02,573 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2021-05-02 13:32:02,573 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848515254] [2021-05-02 13:32:02,573 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 13:32:02,573 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:02,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 13:32:02,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:32:02,574 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand has 48 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 46 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:03,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:03,748 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2021-05-02 13:32:03,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 13:32:03,749 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 46 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-02 13:32:03,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:03,749 INFO L225 Difference]: With dead ends: 62 [2021-05-02 13:32:03,749 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 13:32:03,749 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1417.0ms TimeCoverageRelationStatistics Valid=147, Invalid=2303, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:32:03,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 13:32:03,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 13:32:03,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0196078431372548) internal successors, (52), 51 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:03,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2021-05-02 13:32:03,752 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2021-05-02 13:32:03,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:03,752 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2021-05-02 13:32:03,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 46 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:03,753 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2021-05-02 13:32:03,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 13:32:03,753 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:03,753 INFO L523 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:03,972 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:03,972 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:03,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:03,973 INFO L82 PathProgramCache]: Analyzing trace with hash 2143326266, now seen corresponding path program 42 times [2021-05-02 13:32:03,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:03,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467947185] [2021-05-02 13:32:03,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:03,984 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:32:03,985 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1005945373] [2021-05-02 13:32:03,985 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:08,678 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2021-05-02 13:32:08,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:08,695 WARN L261 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 268 conjunts are in the unsatisfiable core [2021-05-02 13:32:08,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:09,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:09,976 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:32:09,977 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:09,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467947185] [2021-05-02 13:32:09,977 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:32:09,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005945373] [2021-05-02 13:32:09,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005945373] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:09,977 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:32:09,977 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2021-05-02 13:32:09,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194709424] [2021-05-02 13:32:09,977 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:32:09,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:09,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:32:09,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:32:09,978 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand has 49 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 47 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:11,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:11,230 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2021-05-02 13:32:11,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 13:32:11,230 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 47 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 13:32:11,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:11,231 INFO L225 Difference]: With dead ends: 63 [2021-05-02 13:32:11,231 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 13:32:11,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 1216.6ms TimeCoverageRelationStatistics Valid=150, Invalid=2400, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:32:11,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 13:32:11,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-05-02 13:32:11,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0192307692307692) internal successors, (53), 52 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:11,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2021-05-02 13:32:11,234 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2021-05-02 13:32:11,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:11,235 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2021-05-02 13:32:11,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 47 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:11,235 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2021-05-02 13:32:11,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:32:11,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:11,235 INFO L523 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:11,436 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:11,437 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:11,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:11,437 INFO L82 PathProgramCache]: Analyzing trace with hash -751304517, now seen corresponding path program 43 times [2021-05-02 13:32:11,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:11,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002140807] [2021-05-02 13:32:11,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:11,451 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:32:11,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [844164301] [2021-05-02 13:32:11,452 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:11,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:32:11,670 WARN L261 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 272 conjunts are in the unsatisfiable core [2021-05-02 13:32:11,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:12,925 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:32:12,926 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:12,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002140807] [2021-05-02 13:32:12,926 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:32:12,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844164301] [2021-05-02 13:32:12,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [844164301] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:12,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:32:12,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2021-05-02 13:32:12,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880997243] [2021-05-02 13:32:12,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:32:12,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:12,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:32:12,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=2213, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:32:12,927 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 47 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:14,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:14,196 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2021-05-02 13:32:14,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 13:32:14,196 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 47 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-02 13:32:14,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:14,197 INFO L225 Difference]: With dead ends: 64 [2021-05-02 13:32:14,197 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 13:32:14,197 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1190.9ms TimeCoverageRelationStatistics Valid=149, Invalid=2401, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:32:14,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 13:32:14,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-02 13:32:14,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0188679245283019) internal successors, (54), 53 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:14,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2021-05-02 13:32:14,200 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2021-05-02 13:32:14,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:14,200 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2021-05-02 13:32:14,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 47 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:14,200 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2021-05-02 13:32:14,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:32:14,201 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:14,201 INFO L523 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:14,408 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-05-02 13:32:14,409 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:14,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:14,409 INFO L82 PathProgramCache]: Analyzing trace with hash -290545574, now seen corresponding path program 44 times [2021-05-02 13:32:14,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:14,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828904884] [2021-05-02 13:32:14,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:14,420 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:32:14,420 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [328600082] [2021-05-02 13:32:14,421 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:14,838 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:32:14,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:14,843 WARN L261 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 280 conjunts are in the unsatisfiable core [2021-05-02 13:32:14,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:16,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:16,252 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:32:16,253 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:16,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828904884] [2021-05-02 13:32:16,253 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:32:16,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328600082] [2021-05-02 13:32:16,253 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328600082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:16,253 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:32:16,264 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2021-05-02 13:32:16,264 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090044772] [2021-05-02 13:32:16,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 13:32:16,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:16,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 13:32:16,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:32:16,265 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand has 51 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 49 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:17,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:17,533 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2021-05-02 13:32:17,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 13:32:17,533 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 49 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 13:32:17,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:17,533 INFO L225 Difference]: With dead ends: 65 [2021-05-02 13:32:17,534 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 13:32:17,534 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1353.9ms TimeCoverageRelationStatistics Valid=156, Invalid=2600, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 13:32:17,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 13:32:17,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-05-02 13:32:17,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0185185185185186) internal successors, (55), 54 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:17,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2021-05-02 13:32:17,537 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2021-05-02 13:32:17,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:17,538 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2021-05-02 13:32:17,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 49 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:17,538 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2021-05-02 13:32:17,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 13:32:17,538 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:17,538 INFO L523 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:17,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-05-02 13:32:17,749 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:17,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:17,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1108079771, now seen corresponding path program 45 times [2021-05-02 13:32:17,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:17,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932632162] [2021-05-02 13:32:17,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:17,762 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:32:17,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1458289881] [2021-05-02 13:32:17,762 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:36,941 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-05-02 13:32:36,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:36,972 WARN L261 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 292 conjunts are in the unsatisfiable core [2021-05-02 13:32:36,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:39,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:39,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:32:39,656 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:39,656 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932632162] [2021-05-02 13:32:39,656 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:32:39,656 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458289881] [2021-05-02 13:32:39,656 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458289881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:39,656 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:32:39,656 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2021-05-02 13:32:39,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239706820] [2021-05-02 13:32:39,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 13:32:39,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:39,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 13:32:39,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=2602, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 13:32:39,658 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand has 53 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 51 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:41,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:41,199 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2021-05-02 13:32:41,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 13:32:41,199 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 51 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-02 13:32:41,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:41,200 INFO L225 Difference]: With dead ends: 66 [2021-05-02 13:32:41,200 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 13:32:41,200 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 2602.0ms TimeCoverageRelationStatistics Valid=164, Invalid=2806, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:32:41,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 13:32:41,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-02 13:32:41,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.018181818181818) internal successors, (56), 55 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:41,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2021-05-02 13:32:41,204 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2021-05-02 13:32:41,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:41,204 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2021-05-02 13:32:41,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 51 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:41,204 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2021-05-02 13:32:41,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:32:41,204 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:41,204 INFO L523 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:41,418 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 13:32:41,418 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:41,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:41,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1515792506, now seen corresponding path program 46 times [2021-05-02 13:32:41,419 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:41,419 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437149929] [2021-05-02 13:32:41,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:41,430 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:32:41,430 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1582646982] [2021-05-02 13:32:41,430 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:41,659 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:32:41,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:41,663 WARN L261 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 290 conjunts are in the unsatisfiable core [2021-05-02 13:32:41,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:43,100 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:32:43,100 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:43,100 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437149929] [2021-05-02 13:32:43,100 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:32:43,100 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582646982] [2021-05-02 13:32:43,100 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582646982] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:43,100 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:32:43,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2021-05-02 13:32:43,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896424659] [2021-05-02 13:32:43,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 13:32:43,101 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:43,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 13:32:43,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=2504, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:32:43,101 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand has 52 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 50 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:44,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:44,532 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2021-05-02 13:32:44,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 13:32:44,533 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 50 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 13:32:44,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:44,534 INFO L225 Difference]: With dead ends: 67 [2021-05-02 13:32:44,534 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 13:32:44,534 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 1352.4ms TimeCoverageRelationStatistics Valid=158, Invalid=2704, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:32:44,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 13:32:44,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-02 13:32:44,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0178571428571428) internal successors, (57), 56 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:44,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2021-05-02 13:32:44,538 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 59 [2021-05-02 13:32:44,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:44,538 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2021-05-02 13:32:44,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 50 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:44,539 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2021-05-02 13:32:44,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 13:32:44,539 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:44,539 INFO L523 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:44,740 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:44,741 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:44,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:44,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1269985403, now seen corresponding path program 47 times [2021-05-02 13:32:44,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:44,741 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508115243] [2021-05-02 13:32:44,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:44,752 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:32:44,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [626794331] [2021-05-02 13:32:44,753 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:32:48,544 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 13:32:48,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:32:48,554 WARN L261 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 297 conjunts are in the unsatisfiable core [2021-05-02 13:32:48,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:32:49,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:32:50,049 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:32:50,049 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:32:50,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508115243] [2021-05-02 13:32:50,049 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:32:50,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626794331] [2021-05-02 13:32:50,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [626794331] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:32:50,049 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:32:50,049 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2021-05-02 13:32:50,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012570966] [2021-05-02 13:32:50,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 13:32:50,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:32:50,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 13:32:50,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=2605, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 13:32:50,050 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand has 53 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 51 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:51,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:32:51,516 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2021-05-02 13:32:51,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 13:32:51,516 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 51 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-05-02 13:32:51,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:32:51,517 INFO L225 Difference]: With dead ends: 68 [2021-05-02 13:32:51,517 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 13:32:51,517 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 1413.1ms TimeCoverageRelationStatistics Valid=161, Invalid=2809, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:32:51,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 13:32:51,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-05-02 13:32:51,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.0175438596491229) internal successors, (58), 57 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:51,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2021-05-02 13:32:51,521 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 60 [2021-05-02 13:32:51,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:32:51,521 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2021-05-02 13:32:51,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 51 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:32:51,522 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2021-05-02 13:32:51,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 13:32:51,522 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:32:51,522 INFO L523 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:32:51,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 13:32:51,729 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:32:51,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:32:51,729 INFO L82 PathProgramCache]: Analyzing trace with hash -2055067494, now seen corresponding path program 48 times [2021-05-02 13:32:51,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:32:51,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706182916] [2021-05-02 13:32:51,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:32:51,744 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:32:51,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1169724961] [2021-05-02 13:32:51,745 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:22,035 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 13:33:22,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:22,070 WARN L261 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 305 conjunts are in the unsatisfiable core [2021-05-02 13:33:22,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:23,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:23,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:23,933 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:23,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706182916] [2021-05-02 13:33:23,933 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:33:23,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169724961] [2021-05-02 13:33:23,933 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169724961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:23,933 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:33:23,933 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2021-05-02 13:33:23,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281876005] [2021-05-02 13:33:23,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 13:33:23,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:23,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 13:33:23,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=2917, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:33:23,934 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 54 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:25,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:25,554 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2021-05-02 13:33:25,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 13:33:25,554 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 54 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-02 13:33:25,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:25,554 INFO L225 Difference]: With dead ends: 69 [2021-05-02 13:33:25,555 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 13:33:25,555 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 1796.0ms TimeCoverageRelationStatistics Valid=173, Invalid=3133, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:33:25,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 13:33:25,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-02 13:33:25,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0172413793103448) internal successors, (59), 58 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:25,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2021-05-02 13:33:25,558 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 61 [2021-05-02 13:33:25,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:25,558 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2021-05-02 13:33:25,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 54 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:25,558 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2021-05-02 13:33:25,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 13:33:25,558 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:25,559 INFO L523 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:25,759 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-02 13:33:25,759 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:25,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:25,760 INFO L82 PathProgramCache]: Analyzing trace with hash -2052492197, now seen corresponding path program 49 times [2021-05-02 13:33:25,760 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:25,760 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629354772] [2021-05-02 13:33:25,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:25,771 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:33:25,771 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [180873105] [2021-05-02 13:33:25,771 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:26,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:33:26,050 WARN L261 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 308 conjunts are in the unsatisfiable core [2021-05-02 13:33:26,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:27,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:27,643 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:27,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629354772] [2021-05-02 13:33:27,643 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:33:27,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180873105] [2021-05-02 13:33:27,643 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180873105] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:27,643 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:33:27,643 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2021-05-02 13:33:27,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759154433] [2021-05-02 13:33:27,644 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 13:33:27,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:27,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 13:33:27,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=2813, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:33:27,645 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand has 55 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 53 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:29,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:29,261 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2021-05-02 13:33:29,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 13:33:29,262 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 53 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 13:33:29,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:29,262 INFO L225 Difference]: With dead ends: 70 [2021-05-02 13:33:29,262 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 13:33:29,263 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1529.6ms TimeCoverageRelationStatistics Valid=167, Invalid=3025, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 13:33:29,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 13:33:29,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-02 13:33:29,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0169491525423728) internal successors, (60), 59 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:29,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2021-05-02 13:33:29,267 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 62 [2021-05-02 13:33:29,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:29,267 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2021-05-02 13:33:29,267 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 53 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:29,267 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2021-05-02 13:33:29,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 13:33:29,267 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:29,268 INFO L523 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:29,468 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 13:33:29,468 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:29,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:29,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1972657990, now seen corresponding path program 50 times [2021-05-02 13:33:29,469 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:29,469 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551508129] [2021-05-02 13:33:29,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:29,480 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:33:29,481 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [703531105] [2021-05-02 13:33:29,481 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:29,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:33:29,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:29,936 WARN L261 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 316 conjunts are in the unsatisfiable core [2021-05-02 13:33:29,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:31,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:31,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:31,694 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:31,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551508129] [2021-05-02 13:33:31,694 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:33:31,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [703531105] [2021-05-02 13:33:31,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [703531105] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:31,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:33:31,694 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2021-05-02 13:33:31,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354320659] [2021-05-02 13:33:31,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 13:33:31,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:31,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 13:33:31,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3028, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 13:33:31,695 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand has 57 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 55 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:33,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:33,444 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2021-05-02 13:33:33,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 13:33:33,445 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 55 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-02 13:33:33,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:33,445 INFO L225 Difference]: With dead ends: 71 [2021-05-02 13:33:33,445 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 13:33:33,446 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 1695.0ms TimeCoverageRelationStatistics Valid=174, Invalid=3248, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:33:33,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 13:33:33,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-02 13:33:33,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.0166666666666666) internal successors, (61), 60 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:33,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2021-05-02 13:33:33,450 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 63 [2021-05-02 13:33:33,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:33,450 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2021-05-02 13:33:33,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 55 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:33,450 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2021-05-02 13:33:33,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 13:33:33,451 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:33,451 INFO L523 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:33,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2021-05-02 13:33:33,669 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:33,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:33,669 INFO L82 PathProgramCache]: Analyzing trace with hash 502202427, now seen corresponding path program 51 times [2021-05-02 13:33:33,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:33,669 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923784481] [2021-05-02 13:33:33,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:33,680 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:33:33,681 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1703909386] [2021-05-02 13:33:33,681 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:55,423 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-05-02 13:33:55,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:55,445 WARN L261 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 322 conjunts are in the unsatisfiable core [2021-05-02 13:33:55,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:33:57,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:33:57,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:33:57,227 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:33:57,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923784481] [2021-05-02 13:33:57,227 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:33:57,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703909386] [2021-05-02 13:33:57,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703909386] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:33:57,228 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:33:57,228 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2021-05-02 13:33:57,228 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330220910] [2021-05-02 13:33:57,228 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 13:33:57,228 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:33:57,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 13:33:57,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:33:57,229 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand has 58 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 56 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:58,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:33:58,954 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2021-05-02 13:33:58,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 13:33:58,958 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 56 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 64 [2021-05-02 13:33:58,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:33:58,958 INFO L225 Difference]: With dead ends: 72 [2021-05-02 13:33:58,958 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 13:33:58,959 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 1718.6ms TimeCoverageRelationStatistics Valid=177, Invalid=3363, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:33:58,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 13:33:58,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-05-02 13:33:58,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.0163934426229508) internal successors, (62), 61 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:58,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2021-05-02 13:33:58,963 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 64 [2021-05-02 13:33:58,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:33:58,963 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2021-05-02 13:33:58,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 56 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:33:58,963 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2021-05-02 13:33:58,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 13:33:58,963 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:33:58,964 INFO L523 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:33:59,168 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:59,169 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:33:59,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:33:59,169 INFO L82 PathProgramCache]: Analyzing trace with hash -86535974, now seen corresponding path program 52 times [2021-05-02 13:33:59,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:33:59,169 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209806558] [2021-05-02 13:33:59,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:33:59,180 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:33:59,180 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [245810624] [2021-05-02 13:33:59,180 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:33:59,427 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:33:59,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:33:59,431 WARN L261 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 326 conjunts are in the unsatisfiable core [2021-05-02 13:33:59,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:01,260 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:34:01,261 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:01,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209806558] [2021-05-02 13:34:01,261 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:34:01,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245810624] [2021-05-02 13:34:01,261 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [245810624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:01,261 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:34:01,261 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2021-05-02 13:34:01,261 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128849943] [2021-05-02 13:34:01,261 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 13:34:01,261 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:01,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 13:34:01,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=3140, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:34:01,262 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand has 58 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 56 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:03,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:03,084 INFO L93 Difference]: Finished difference Result 73 states and 73 transitions. [2021-05-02 13:34:03,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 13:34:03,084 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 56 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 13:34:03,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:03,084 INFO L225 Difference]: With dead ends: 73 [2021-05-02 13:34:03,085 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 13:34:03,085 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 1757.5ms TimeCoverageRelationStatistics Valid=176, Invalid=3364, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:34:03,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 13:34:03,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-05-02 13:34:03,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0161290322580645) internal successors, (63), 62 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:03,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2021-05-02 13:34:03,088 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 65 [2021-05-02 13:34:03,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:03,088 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2021-05-02 13:34:03,088 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 56 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:03,088 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2021-05-02 13:34:03,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-02 13:34:03,088 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:03,088 INFO L523 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:03,289 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 13:34:03,289 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:03,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:03,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1157557221, now seen corresponding path program 53 times [2021-05-02 13:34:03,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:03,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489440463] [2021-05-02 13:34:03,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:03,301 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:34:03,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2017409892] [2021-05-02 13:34:03,302 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:08,355 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2021-05-02 13:34:08,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:08,362 WARN L261 TraceCheckSpWp]: Trace formula consists of 470 conjuncts, 334 conjunts are in the unsatisfiable core [2021-05-02 13:34:08,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:10,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:10,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:34:10,252 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:10,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489440463] [2021-05-02 13:34:10,252 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:34:10,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017409892] [2021-05-02 13:34:10,253 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017409892] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:10,253 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:34:10,253 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2021-05-02 13:34:10,253 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823311622] [2021-05-02 13:34:10,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 13:34:10,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:10,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 13:34:10,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3367, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:34:10,253 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand has 60 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 58 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:12,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:12,119 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2021-05-02 13:34:12,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 13:34:12,123 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 58 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2021-05-02 13:34:12,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:12,124 INFO L225 Difference]: With dead ends: 74 [2021-05-02 13:34:12,124 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 13:34:12,124 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1817.1ms TimeCoverageRelationStatistics Valid=183, Invalid=3599, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:34:12,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 13:34:12,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-05-02 13:34:12,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.0158730158730158) internal successors, (64), 63 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:12,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2021-05-02 13:34:12,128 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 66 [2021-05-02 13:34:12,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:12,128 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2021-05-02 13:34:12,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 58 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:12,128 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2021-05-02 13:34:12,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 13:34:12,128 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:12,128 INFO L523 BasicCegarLoop]: trace histogram [54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:12,334 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-05-02 13:34:12,334 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:12,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:12,334 INFO L82 PathProgramCache]: Analyzing trace with hash 522490, now seen corresponding path program 54 times [2021-05-02 13:34:12,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:12,335 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489382884] [2021-05-02 13:34:12,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:12,346 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:34:12,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1779268353] [2021-05-02 13:34:12,346 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:23,797 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2021-05-02 13:37:23,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:37:23,906 WARN L261 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 343 conjunts are in the unsatisfiable core [2021-05-02 13:37:23,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:28,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:28,326 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:37:28,326 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:28,326 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489382884] [2021-05-02 13:37:28,326 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:37:28,326 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779268353] [2021-05-02 13:37:28,326 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779268353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:28,326 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:37:28,327 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2021-05-02 13:37:28,327 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422875640] [2021-05-02 13:37:28,327 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 13:37:28,327 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:28,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 13:37:28,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=3601, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:37:28,328 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 60 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:37:30,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:30,472 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2021-05-02 13:37:30,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 13:37:30,473 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 60 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-02 13:37:30,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:30,473 INFO L225 Difference]: With dead ends: 75 [2021-05-02 13:37:30,473 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 13:37:30,474 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 4321.6ms TimeCoverageRelationStatistics Valid=191, Invalid=3841, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 13:37:30,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 13:37:30,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-02 13:37:30,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.015625) internal successors, (65), 64 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:37:30,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2021-05-02 13:37:30,476 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 67 [2021-05-02 13:37:30,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:30,476 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2021-05-02 13:37:30,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 60 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:37:30,477 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2021-05-02 13:37:30,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 13:37:30,477 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:30,477 INFO L523 BasicCegarLoop]: trace histogram [55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:30,677 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:30,678 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:30,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:30,678 INFO L82 PathProgramCache]: Analyzing trace with hash 1541255163, now seen corresponding path program 55 times [2021-05-02 13:37:30,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:30,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896086531] [2021-05-02 13:37:30,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:30,690 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:30,690 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2088350782] [2021-05-02 13:37:30,690 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:31,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:37:31,097 WARN L261 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 346 conjunts are in the unsatisfiable core [2021-05-02 13:37:31,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:32,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:33,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:37:33,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:33,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896086531] [2021-05-02 13:37:33,111 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:37:33,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088350782] [2021-05-02 13:37:33,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088350782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:33,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:37:33,111 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2021-05-02 13:37:33,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486872943] [2021-05-02 13:37:33,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 13:37:33,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:33,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 13:37:33,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=3603, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:37:33,112 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand has 62 states, 62 states have (on average 1.032258064516129) internal successors, (64), 60 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:37:35,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:35,373 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2021-05-02 13:37:35,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 13:37:35,373 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.032258064516129) internal successors, (64), 60 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-05-02 13:37:35,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:35,374 INFO L225 Difference]: With dead ends: 76 [2021-05-02 13:37:35,374 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 13:37:35,374 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1956.1ms TimeCoverageRelationStatistics Valid=189, Invalid=3843, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 13:37:35,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 13:37:35,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-05-02 13:37:35,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.0153846153846153) internal successors, (66), 65 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:37:35,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2021-05-02 13:37:35,379 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 68 [2021-05-02 13:37:35,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:35,379 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2021-05-02 13:37:35,379 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 1.032258064516129) internal successors, (64), 60 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:37:35,379 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2021-05-02 13:37:35,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 13:37:35,379 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:35,379 INFO L523 BasicCegarLoop]: trace histogram [56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:35,585 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-02 13:37:35,586 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:35,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:35,586 INFO L82 PathProgramCache]: Analyzing trace with hash 2059327770, now seen corresponding path program 56 times [2021-05-02 13:37:35,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:35,586 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863730110] [2021-05-02 13:37:35,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:35,599 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:35,599 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1675696422] [2021-05-02 13:37:35,599 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:35,990 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:37:35,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:37:35,996 WARN L261 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 352 conjunts are in the unsatisfiable core [2021-05-02 13:37:35,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:38,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:38,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:37:38,135 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:37:38,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863730110] [2021-05-02 13:37:38,136 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:37:38,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675696422] [2021-05-02 13:37:38,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1675696422] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:38,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:37:38,136 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2021-05-02 13:37:38,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109013331] [2021-05-02 13:37:38,136 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 13:37:38,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:38,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 13:37:38,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=3724, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 13:37:38,137 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand has 63 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 61 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:37:40,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:40,255 INFO L93 Difference]: Finished difference Result 77 states and 77 transitions. [2021-05-02 13:37:40,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-02 13:37:40,256 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 61 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-02 13:37:40,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:40,256 INFO L225 Difference]: With dead ends: 77 [2021-05-02 13:37:40,256 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 13:37:40,257 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 2069.4ms TimeCoverageRelationStatistics Valid=192, Invalid=3968, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 13:37:40,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 13:37:40,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 13:37:40,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0151515151515151) internal successors, (67), 66 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:37:40,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2021-05-02 13:37:40,260 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 69 [2021-05-02 13:37:40,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:40,260 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2021-05-02 13:37:40,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 61 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:37:40,260 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2021-05-02 13:37:40,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 13:37:40,260 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:40,260 INFO L523 BasicCegarLoop]: trace histogram [57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:40,460 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:37:40,461 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:40,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:40,461 INFO L82 PathProgramCache]: Analyzing trace with hash 939709403, now seen corresponding path program 57 times [2021-05-02 13:37:40,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:40,461 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399835077] [2021-05-02 13:37:40,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:40,473 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:37:40,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [52389565] [2021-05-02 13:37:40,474 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:11,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-05-02 13:38:11,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:38:11,725 WARN L261 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 360 conjunts are in the unsatisfiable core [2021-05-02 13:38:11,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:17,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:17,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:38:17,995 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:17,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399835077] [2021-05-02 13:38:17,995 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:17,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [52389565] [2021-05-02 13:38:17,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [52389565] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:17,995 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:38:17,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2021-05-02 13:38:17,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321976284] [2021-05-02 13:38:17,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 13:38:17,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:17,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 13:38:17,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=3970, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 13:38:17,996 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand has 65 states, 64 states have (on average 1.03125) internal successors, (66), 63 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:38:20,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:20,426 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2021-05-02 13:38:20,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-02 13:38:20,427 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 1.03125) internal successors, (66), 63 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-05-02 13:38:20,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:20,427 INFO L225 Difference]: With dead ends: 78 [2021-05-02 13:38:20,427 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 13:38:20,428 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 6202.0ms TimeCoverageRelationStatistics Valid=200, Invalid=4222, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 13:38:20,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 13:38:20,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-05-02 13:38:20,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.0149253731343284) internal successors, (68), 67 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:38:20,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2021-05-02 13:38:20,431 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 70 [2021-05-02 13:38:20,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:20,431 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2021-05-02 13:38:20,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 64 states have (on average 1.03125) internal successors, (66), 63 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:38:20,431 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2021-05-02 13:38:20,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 13:38:20,431 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:20,432 INFO L523 BasicCegarLoop]: trace histogram [58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:20,644 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 13:38:20,645 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:20,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:20,645 INFO L82 PathProgramCache]: Analyzing trace with hash 591278394, now seen corresponding path program 58 times [2021-05-02 13:38:20,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:20,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86054490] [2021-05-02 13:38:20,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:20,657 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:20,657 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [523166894] [2021-05-02 13:38:20,657 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 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:38:21,010 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:38:21,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:38:21,015 WARN L261 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 361 conjunts are in the unsatisfiable core [2021-05-02 13:38:21,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:38:23,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:23,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:38:23,404 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:38:23,404 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:38:23,404 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86054490] [2021-05-02 13:38:23,405 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:38:23,405 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523166894] [2021-05-02 13:38:23,405 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523166894] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:38:23,405 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:38:23,405 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2021-05-02 13:38:23,405 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514402545] [2021-05-02 13:38:23,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 13:38:23,405 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:38:23,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 13:38:23,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=3972, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 13:38:23,406 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand has 65 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 63 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:38:25,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:38:25,807 INFO L93 Difference]: Finished difference Result 79 states and 79 transitions. [2021-05-02 13:38:25,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-02 13:38:25,808 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 63 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-02 13:38:25,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:38:25,808 INFO L225 Difference]: With dead ends: 79 [2021-05-02 13:38:25,808 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 13:38:25,809 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 2293.9ms TimeCoverageRelationStatistics Valid=198, Invalid=4224, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 13:38:25,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 13:38:25,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-05-02 13:38:25,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0147058823529411) internal successors, (69), 68 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:38:25,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2021-05-02 13:38:25,813 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 71 [2021-05-02 13:38:25,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:38:25,813 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2021-05-02 13:38:25,813 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 63 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:38:25,813 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2021-05-02 13:38:25,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-02 13:38:25,814 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:38:25,814 INFO L523 BasicCegarLoop]: trace histogram [59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:38:26,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-05-02 13:38:26,037 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:38:26,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:38:26,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1620148293, now seen corresponding path program 59 times [2021-05-02 13:38:26,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:38:26,037 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456714888] [2021-05-02 13:38:26,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:38:26,050 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:38:26,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [913012601] [2021-05-02 13:38:26,051 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:39:05,450 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2021-05-02 13:39:05,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:39:05,506 WARN L261 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 371 conjunts are in the unsatisfiable core [2021-05-02 13:39:05,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:39:07,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:39:08,029 INFO L134 CoverageAnalysis]: Checked inductivity of 1770 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:39:08,029 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:39:08,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456714888] [2021-05-02 13:39:08,029 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:39:08,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913012601] [2021-05-02 13:39:08,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913012601] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:39:08,030 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:39:08,030 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66] total 66 [2021-05-02 13:39:08,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312121951] [2021-05-02 13:39:08,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 13:39:08,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:39:08,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 13:39:08,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=4099, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:39:08,031 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand has 66 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 64 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:39:10,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:39:10,733 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2021-05-02 13:39:10,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-02 13:39:10,734 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 64 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-05-02 13:39:10,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:39:10,734 INFO L225 Difference]: With dead ends: 80 [2021-05-02 13:39:10,734 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 13:39:10,735 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 2410.8ms TimeCoverageRelationStatistics Valid=201, Invalid=4355, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 13:39:10,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 13:39:10,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-05-02 13:39:10,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.0144927536231885) internal successors, (70), 69 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:39:10,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2021-05-02 13:39:10,739 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 72 [2021-05-02 13:39:10,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:39:10,739 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2021-05-02 13:39:10,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 64 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:39:10,740 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2021-05-02 13:39:10,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 13:39:10,740 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:39:10,740 INFO L523 BasicCegarLoop]: trace histogram [60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:39:10,950 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-02 13:39:10,951 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:39:10,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:39:10,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1454898854, now seen corresponding path program 60 times [2021-05-02 13:39:10,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:39:10,951 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552963792] [2021-05-02 13:39:10,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:39:10,963 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:39:10,963 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [207366754] [2021-05-02 13:39:10,963 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 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true