/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound10.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 14:27:14,436 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 14:27:14,438 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 14:27:14,461 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 14:27:14,467 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 14:27:14,468 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 14:27:14,468 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 14:27:14,469 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 14:27:14,469 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 14:27:14,470 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 14:27:14,471 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 14:27:14,472 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 14:27:14,473 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 14:27:14,473 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 14:27:14,474 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 14:27:14,475 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 14:27:14,476 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 14:27:14,481 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 14:27:14,481 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 14:27:14,482 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 14:27:14,483 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 14:27:14,498 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 14:27:14,498 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 14:27:14,499 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 14:27:14,499 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 14:27:14,500 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 14:27:14,500 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 14:27:14,500 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 14:27:14,500 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 14:27:14,500 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 14:27:14,500 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 14:27:14,500 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 14:27:14,501 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 14:27:14,501 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 14:27:14,501 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 14:27:14,501 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 14:27:14,501 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 14:27:14,501 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 14:27:14,501 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 14:27:14,502 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 14:27:14,502 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 14:27:14,502 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:27:14,502 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 14:27:14,502 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 14:27:14,502 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 14:27:14,502 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 14:27:14,503 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 14:27:14,503 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 14:27:14,520 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 14:27:14,521 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 14:27:14,796 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 14:27:14,809 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 14:27:14,811 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 14:27:14,812 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 14:27:14,813 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 14:27:14,813 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound10.i [2021-05-02 14:27:14,869 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ef7f09a6/b2d46dbec109481ebef6e0cf2ed2b89c/FLAGd7ff02b3f [2021-05-02 14:27:15,233 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 14:27:15,234 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound10.i [2021-05-02 14:27:15,238 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ef7f09a6/b2d46dbec109481ebef6e0cf2ed2b89c/FLAGd7ff02b3f [2021-05-02 14:27:15,249 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ef7f09a6/b2d46dbec109481ebef6e0cf2ed2b89c [2021-05-02 14:27:15,250 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 14:27:15,252 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 14:27:15,253 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 14:27:15,253 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 14:27:15,255 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 14:27:15,256 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:27:15" (1/1) ... [2021-05-02 14:27:15,257 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4458fffd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:27:15, skipping insertion in model container [2021-05-02 14:27:15,257 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:27:15" (1/1) ... [2021-05-02 14:27:15,261 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 14:27:15,272 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 14:27:15,364 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound10.i[959,972] [2021-05-02 14:27:15,380 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:27:15,386 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 14:27:15,400 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound10.i[959,972] [2021-05-02 14:27:15,415 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:27:15,464 INFO L208 MainTranslator]: Completed translation [2021-05-02 14:27:15,464 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:27:15 WrapperNode [2021-05-02 14:27:15,464 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 14:27:15,465 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 14:27:15,466 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 14:27:15,467 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 14:27:15,474 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:27:15" (1/1) ... [2021-05-02 14:27:15,475 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:27:15" (1/1) ... [2021-05-02 14:27:15,481 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:27:15" (1/1) ... [2021-05-02 14:27:15,481 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:27:15" (1/1) ... [2021-05-02 14:27:15,494 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:27:15" (1/1) ... [2021-05-02 14:27:15,498 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:27:15" (1/1) ... [2021-05-02 14:27:15,503 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:27:15" (1/1) ... [2021-05-02 14:27:15,507 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 14:27:15,508 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 14:27:15,508 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 14:27:15,508 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 14:27:15,509 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:27:15" (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 14:27:15,582 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 14:27:15,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 14:27:15,583 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 14:27:15,583 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 14:27:15,583 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 14:27:15,583 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 14:27:15,584 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 14:27:15,584 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 14:27:15,584 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 14:27:15,584 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 14:27:15,585 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 14:27:15,585 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 14:27:15,585 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 14:27:15,585 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 14:27:15,586 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 14:27:15,586 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 14:27:15,586 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 14:27:15,586 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 14:27:15,586 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 14:27:15,586 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 14:27:15,586 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 14:27:15,586 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 14:27:15,779 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 14:27:15,779 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 14:27:15,780 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:27:15 BoogieIcfgContainer [2021-05-02 14:27:15,780 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 14:27:15,781 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 14:27:15,781 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 14:27:15,783 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 14:27:15,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 02:27:15" (1/3) ... [2021-05-02 14:27:15,784 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61bb79b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:27:15, skipping insertion in model container [2021-05-02 14:27:15,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:27:15" (2/3) ... [2021-05-02 14:27:15,784 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61bb79b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:27:15, skipping insertion in model container [2021-05-02 14:27:15,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:27:15" (3/3) ... [2021-05-02 14:27:15,785 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound10.i [2021-05-02 14:27:15,789 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 14:27:15,792 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 14:27:15,804 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 14:27:15,825 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 14:27:15,825 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 14:27:15,825 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 14:27:15,825 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 14:27:15,825 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 14:27:15,825 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 14:27:15,831 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 14:27:15,832 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 14:27:15,850 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:27:15,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 14:27:15,864 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:15,864 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:15,865 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:15,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:15,882 INFO L82 PathProgramCache]: Analyzing trace with hash -2126508982, now seen corresponding path program 1 times [2021-05-02 14:27:15,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:15,888 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871781476] [2021-05-02 14:27:15,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:15,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:16,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:27:16,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:16,043 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 14:27:16,044 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:16,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871781476] [2021-05-02 14:27:16,045 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871781476] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:27:16,045 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:27:16,046 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:27:16,046 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958718923] [2021-05-02 14:27:16,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:27:16,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:16,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:27:16,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:27:16,063 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 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 14:27:16,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:16,152 INFO L93 Difference]: Finished difference Result 44 states and 60 transitions. [2021-05-02 14:27:16,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:27:16,153 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 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 12 [2021-05-02 14:27:16,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:16,160 INFO L225 Difference]: With dead ends: 44 [2021-05-02 14:27:16,161 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 14:27:16,163 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:27:16,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 14:27:16,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 14:27:16,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:16,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-05-02 14:27:16,193 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 12 [2021-05-02 14:27:16,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:16,194 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-05-02 14:27:16,195 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 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 14:27:16,195 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-05-02 14:27:16,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 14:27:16,195 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:16,195 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:16,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 14:27:16,196 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:16,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:16,197 INFO L82 PathProgramCache]: Analyzing trace with hash 941422680, now seen corresponding path program 1 times [2021-05-02 14:27:16,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:16,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844052179] [2021-05-02 14:27:16,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:16,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:16,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:27:16,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:16,351 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 14:27:16,352 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:16,352 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844052179] [2021-05-02 14:27:16,352 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844052179] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:27:16,352 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:27:16,352 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 14:27:16,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270838111] [2021-05-02 14:27:16,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:27:16,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:16,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:27:16,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:27:16,354 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 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 14:27:16,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:16,451 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2021-05-02 14:27:16,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:27:16,452 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 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 14:27:16,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:16,453 INFO L225 Difference]: With dead ends: 35 [2021-05-02 14:27:16,454 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 14:27:16,454 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 55.6ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:27:16,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 14:27:16,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 14:27:16,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:16,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-05-02 14:27:16,463 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 14 [2021-05-02 14:27:16,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:16,463 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-05-02 14:27:16,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 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 14:27:16,463 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-05-02 14:27:16,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 14:27:16,464 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:16,464 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:16,465 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 14:27:16,466 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:16,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:16,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1209133518, now seen corresponding path program 1 times [2021-05-02 14:27:16,469 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:16,469 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942590010] [2021-05-02 14:27:16,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:16,491 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:16,492 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [301020927] [2021-05-02 14:27:16,492 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 14:27:16,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:16,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:27:16,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:16,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:16,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:16,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:16,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:16,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:16,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:16,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:16,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:16,693 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 14:27:16,693 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:16,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942590010] [2021-05-02 14:27:16,694 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:16,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301020927] [2021-05-02 14:27:16,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301020927] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:27:16,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:27:16,694 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:27:16,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707399751] [2021-05-02 14:27:16,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:27:16,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:16,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:27:16,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:27:16,696 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 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 14:27:16,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:16,713 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2021-05-02 14:27:16,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:27:16,713 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 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 14:27:16,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:16,714 INFO L225 Difference]: With dead ends: 34 [2021-05-02 14:27:16,714 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 14:27:16,714 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 13.4ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:27:16,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 14:27:16,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 14:27:16,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:16,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-05-02 14:27:16,718 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 15 [2021-05-02 14:27:16,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:16,718 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-05-02 14:27:16,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 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 14:27:16,718 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-05-02 14:27:16,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 14:27:16,719 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:16,719 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:16,929 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 14:27:16,929 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:16,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:16,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1207346058, now seen corresponding path program 1 times [2021-05-02 14:27:16,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:16,930 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [471375674] [2021-05-02 14:27:16,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:16,937 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:16,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1506915713] [2021-05-02 14:27:16,937 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 14:27:17,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:17,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 14:27:17,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:17,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,111 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 14:27:17,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:17,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [471375674] [2021-05-02 14:27:17,111 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:17,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506915713] [2021-05-02 14:27:17,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506915713] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:27:17,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:27:17,112 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 14:27:17,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474087331] [2021-05-02 14:27:17,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:27:17,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:17,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:27:17,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:27:17,114 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 14:27:17,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:17,161 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2021-05-02 14:27:17,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:27:17,162 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 15 [2021-05-02 14:27:17,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:17,162 INFO L225 Difference]: With dead ends: 35 [2021-05-02 14:27:17,162 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 14:27:17,163 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 28.7ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:27:17,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 14:27:17,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 14:27:17,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:17,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-05-02 14:27:17,167 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 15 [2021-05-02 14:27:17,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:17,168 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-05-02 14:27:17,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 14:27:17,168 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-05-02 14:27:17,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 14:27:17,168 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:17,168 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:17,387 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:17,389 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:17,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:17,389 INFO L82 PathProgramCache]: Analyzing trace with hash -352921097, now seen corresponding path program 1 times [2021-05-02 14:27:17,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:17,390 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2022527764] [2021-05-02 14:27:17,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:17,397 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:17,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1686126558] [2021-05-02 14:27:17,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:17,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:17,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:27:17,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:17,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,504 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:27:17,504 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:17,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2022527764] [2021-05-02 14:27:17,504 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:17,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686126558] [2021-05-02 14:27:17,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686126558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:17,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:17,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 14:27:17,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408511996] [2021-05-02 14:27:17,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:27:17,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:17,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:27:17,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:27:17,506 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 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 14:27:17,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:17,525 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2021-05-02 14:27:17,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:27:17,526 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 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 14:27:17,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:17,526 INFO L225 Difference]: With dead ends: 46 [2021-05-02 14:27:17,526 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 14:27:17,527 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.8ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:27:17,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 14:27:17,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 14:27:17,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.28) internal successors, (32), 26 states have internal predecessors, (32), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:17,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-02 14:27:17,530 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 17 [2021-05-02 14:27:17,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:17,530 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-02 14:27:17,531 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 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 14:27:17,531 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-02 14:27:17,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 14:27:17,531 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:17,531 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:17,737 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:17,737 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:17,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:17,737 INFO L82 PathProgramCache]: Analyzing trace with hash 1615882355, now seen corresponding path program 1 times [2021-05-02 14:27:17,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:17,738 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715614201] [2021-05-02 14:27:17,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:17,744 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:17,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [663929243] [2021-05-02 14:27:17,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:17,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:17,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:27:17,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:17,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:17,872 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 14:27:17,872 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:17,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715614201] [2021-05-02 14:27:17,872 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:17,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663929243] [2021-05-02 14:27:17,873 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663929243] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:17,873 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:17,873 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:27:17,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587586659] [2021-05-02 14:27:17,877 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:27:17,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:17,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:27:17,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:27:17,878 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 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 14:27:17,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:17,918 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2021-05-02 14:27:17,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 14:27:17,919 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 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 14:27:17,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:17,920 INFO L225 Difference]: With dead ends: 46 [2021-05-02 14:27:17,920 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 14:27:17,921 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 18.2ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:27:17,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 14:27:17,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-02 14:27:17,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 30 states have internal predecessors, (38), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:17,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2021-05-02 14:27:17,942 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 18 [2021-05-02 14:27:17,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:17,942 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2021-05-02 14:27:17,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 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 14:27:17,943 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2021-05-02 14:27:17,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 14:27:17,944 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:17,944 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:18,153 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:18,153 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:18,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:18,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1617669815, now seen corresponding path program 1 times [2021-05-02 14:27:18,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:18,154 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193727861] [2021-05-02 14:27:18,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:18,161 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:18,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [529037298] [2021-05-02 14:27:18,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:18,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:18,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 14:27:18,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:18,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:18,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:18,308 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 14:27:18,309 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:18,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193727861] [2021-05-02 14:27:18,309 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:18,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529037298] [2021-05-02 14:27:18,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529037298] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:18,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:18,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:27:18,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419803359] [2021-05-02 14:27:18,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:27:18,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:18,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:27:18,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:27:18,310 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 14:27:18,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:18,371 INFO L93 Difference]: Finished difference Result 52 states and 63 transitions. [2021-05-02 14:27:18,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:27:18,371 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 18 [2021-05-02 14:27:18,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:18,372 INFO L225 Difference]: With dead ends: 52 [2021-05-02 14:27:18,372 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 14:27:18,372 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.6ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:27:18,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 14:27:18,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-05-02 14:27:18,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 36 states have internal predecessors, (44), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:27:18,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2021-05-02 14:27:18,377 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 18 [2021-05-02 14:27:18,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:18,377 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2021-05-02 14:27:18,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 14:27:18,377 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2021-05-02 14:27:18,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 14:27:18,378 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:18,378 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:18,596 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 14:27:18,597 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:18,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:18,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1627795671, now seen corresponding path program 1 times [2021-05-02 14:27:18,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:18,598 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365477737] [2021-05-02 14:27:18,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:18,603 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:18,603 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [190573618] [2021-05-02 14:27:18,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 14:27:18,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:18,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:27:18,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:18,689 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:27:18,690 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:18,690 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365477737] [2021-05-02 14:27:18,690 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:18,690 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190573618] [2021-05-02 14:27:18,690 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190573618] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:27:18,690 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:27:18,690 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:27:18,690 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562459695] [2021-05-02 14:27:18,691 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:27:18,691 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:18,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:27:18,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:27:18,692 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:18,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:18,705 INFO L93 Difference]: Finished difference Result 58 states and 69 transitions. [2021-05-02 14:27:18,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:27:18,705 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2021-05-02 14:27:18,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:18,706 INFO L225 Difference]: With dead ends: 58 [2021-05-02 14:27:18,706 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 14:27:18,706 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:27:18,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 14:27:18,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 14:27:18,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:18,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2021-05-02 14:27:18,709 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 24 [2021-05-02 14:27:18,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:18,710 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2021-05-02 14:27:18,710 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:18,710 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2021-05-02 14:27:18,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 14:27:18,710 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:18,710 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:18,926 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:18,927 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:18,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:18,927 INFO L82 PathProgramCache]: Analyzing trace with hash -1817538190, now seen corresponding path program 1 times [2021-05-02 14:27:18,927 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:18,927 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134834524] [2021-05-02 14:27:18,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:18,933 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:18,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1435132816] [2021-05-02 14:27:18,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:18,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:18,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:27:18,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:19,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,077 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:27:19,077 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:19,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134834524] [2021-05-02 14:27:19,077 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:19,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435132816] [2021-05-02 14:27:19,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435132816] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:19,078 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:19,078 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:27:19,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235391117] [2021-05-02 14:27:19,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:27:19,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:19,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:27:19,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:27:19,079 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:19,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:19,114 INFO L93 Difference]: Finished difference Result 60 states and 70 transitions. [2021-05-02 14:27:19,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:27:19,114 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-05-02 14:27:19,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:19,115 INFO L225 Difference]: With dead ends: 60 [2021-05-02 14:27:19,115 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 14:27:19,115 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 20.8ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:27:19,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 14:27:19,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 47. [2021-05-02 14:27:19,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 36 states have (on average 1.25) internal successors, (45), 37 states have internal predecessors, (45), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:27:19,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2021-05-02 14:27:19,119 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 27 [2021-05-02 14:27:19,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:19,119 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2021-05-02 14:27:19,119 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:19,119 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2021-05-02 14:27:19,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 14:27:19,120 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:19,120 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:19,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:19,325 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:19,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:19,327 INFO L82 PathProgramCache]: Analyzing trace with hash -1815750730, now seen corresponding path program 1 times [2021-05-02 14:27:19,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:19,327 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076477627] [2021-05-02 14:27:19,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:19,333 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:19,333 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [108611230] [2021-05-02 14:27:19,334 INFO L95 rtionOrderModulation]: Keeping assertion order 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 14:27:19,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:19,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 14:27:19,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:19,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,532 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:27:19,532 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:19,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076477627] [2021-05-02 14:27:19,532 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:19,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108611230] [2021-05-02 14:27:19,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108611230] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:19,533 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:19,533 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:27:19,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068081526] [2021-05-02 14:27:19,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:27:19,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:19,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:27:19,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:27:19,534 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:19,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:19,686 INFO L93 Difference]: Finished difference Result 64 states and 73 transitions. [2021-05-02 14:27:19,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:27:19,689 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-05-02 14:27:19,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:19,689 INFO L225 Difference]: With dead ends: 64 [2021-05-02 14:27:19,689 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 14:27:19,690 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 95.9ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:27:19,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 14:27:19,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2021-05-02 14:27:19,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 40 states have (on average 1.225) internal successors, (49), 41 states have internal predecessors, (49), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:27:19,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2021-05-02 14:27:19,695 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 27 [2021-05-02 14:27:19,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:19,695 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2021-05-02 14:27:19,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:19,695 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2021-05-02 14:27:19,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:27:19,695 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:19,696 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:19,911 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 14:27:19,911 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:19,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:19,912 INFO L82 PathProgramCache]: Analyzing trace with hash -2046623859, now seen corresponding path program 1 times [2021-05-02 14:27:19,912 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:19,912 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193813276] [2021-05-02 14:27:19,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:19,918 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:19,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1482103807] [2021-05-02 14:27:19,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 14:27:19,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:27:19,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:27:19,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:19,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:19,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,026 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:27:20,026 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:20,026 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193813276] [2021-05-02 14:27:20,026 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:20,026 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482103807] [2021-05-02 14:27:20,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482103807] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:20,026 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:20,026 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:27:20,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396950465] [2021-05-02 14:27:20,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:27:20,027 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:20,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:27:20,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:27:20,027 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:20,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:20,057 INFO L93 Difference]: Finished difference Result 76 states and 89 transitions. [2021-05-02 14:27:20,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:27:20,057 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-05-02 14:27:20,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:20,058 INFO L225 Difference]: With dead ends: 76 [2021-05-02 14:27:20,058 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 14:27:20,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 18.5ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:27:20,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 14:27:20,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 14:27:20,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 43 states have internal predecessors, (51), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:27:20,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2021-05-02 14:27:20,072 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 29 [2021-05-02 14:27:20,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:20,073 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2021-05-02 14:27:20,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:20,073 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2021-05-02 14:27:20,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 14:27:20,076 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:20,076 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:20,302 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:20,302 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:20,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:20,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1080461875, now seen corresponding path program 2 times [2021-05-02 14:27:20,303 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:20,303 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117446096] [2021-05-02 14:27:20,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:20,309 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:20,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1860038875] [2021-05-02 14:27:20,309 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 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 14:27:20,367 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:27:20,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:27:20,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 14:27:20,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:20,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,455 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:27:20,456 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:20,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117446096] [2021-05-02 14:27:20,456 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:20,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860038875] [2021-05-02 14:27:20,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860038875] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:20,456 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:20,456 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:27:20,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956674344] [2021-05-02 14:27:20,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:27:20,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:20,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:27:20,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:27:20,457 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:20,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:20,498 INFO L93 Difference]: Finished difference Result 81 states and 94 transitions. [2021-05-02 14:27:20,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:27:20,498 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-05-02 14:27:20,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:20,500 INFO L225 Difference]: With dead ends: 81 [2021-05-02 14:27:20,500 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 14:27:20,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 29.1ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:27:20,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 14:27:20,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 68. [2021-05-02 14:27:20,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 54 states have internal predecessors, (65), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:27:20,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-02 14:27:20,507 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 30 [2021-05-02 14:27:20,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:20,507 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-02 14:27:20,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:20,507 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-02 14:27:20,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 14:27:20,509 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:20,509 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:20,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:20,725 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:20,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:20,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1082249335, now seen corresponding path program 2 times [2021-05-02 14:27:20,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:20,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613760305] [2021-05-02 14:27:20,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:20,731 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:20,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1049719740] [2021-05-02 14:27:20,732 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 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 14:27:20,804 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:27:20,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:27:20,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 14:27:20,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:20,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:20,948 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:27:20,949 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:20,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613760305] [2021-05-02 14:27:20,949 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:20,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049719740] [2021-05-02 14:27:20,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049719740] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:20,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:20,949 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:27:20,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167728873] [2021-05-02 14:27:20,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:27:20,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:20,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:27:20,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:27:20,950 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:21,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:21,096 INFO L93 Difference]: Finished difference Result 95 states and 111 transitions. [2021-05-02 14:27:21,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:27:21,096 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-05-02 14:27:21,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:21,098 INFO L225 Difference]: With dead ends: 95 [2021-05-02 14:27:21,098 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 14:27:21,099 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 74.9ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:27:21,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 14:27:21,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 88. [2021-05-02 14:27:21,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 68 states have (on average 1.1911764705882353) internal successors, (81), 70 states have internal predecessors, (81), 11 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 14:27:21,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 101 transitions. [2021-05-02 14:27:21,113 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 101 transitions. Word has length 30 [2021-05-02 14:27:21,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:21,113 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 101 transitions. [2021-05-02 14:27:21,113 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:21,114 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 101 transitions. [2021-05-02 14:27:21,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 14:27:21,115 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:21,115 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:21,329 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 14:27:21,329 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:21,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:21,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1417698711, now seen corresponding path program 3 times [2021-05-02 14:27:21,330 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:21,330 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912062701] [2021-05-02 14:27:21,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:21,348 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:21,348 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [149918459] [2021-05-02 14:27:21,348 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 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 14:27:22,225 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:27:22,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:27:22,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 14:27:22,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:22,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:22,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:22,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:22,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:22,383 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:27:22,384 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:22,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912062701] [2021-05-02 14:27:22,384 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:22,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149918459] [2021-05-02 14:27:22,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149918459] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:22,384 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:22,384 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:27:22,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672148197] [2021-05-02 14:27:22,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:27:22,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:22,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:27:22,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:27:22,386 INFO L87 Difference]: Start difference. First operand 88 states and 101 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:22,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:22,423 INFO L93 Difference]: Finished difference Result 104 states and 119 transitions. [2021-05-02 14:27:22,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:27:22,423 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 36 [2021-05-02 14:27:22,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:22,426 INFO L225 Difference]: With dead ends: 104 [2021-05-02 14:27:22,426 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 14:27:22,428 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 33.5ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:27:22,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 14:27:22,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2021-05-02 14:27:22,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2) internal successors, (42), 36 states have internal predecessors, (42), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:27:22,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2021-05-02 14:27:22,434 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 36 [2021-05-02 14:27:22,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:22,434 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2021-05-02 14:27:22,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:22,434 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2021-05-02 14:27:22,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 14:27:22,435 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:22,435 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:22,643 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 14:27:22,643 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:22,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:22,643 INFO L82 PathProgramCache]: Analyzing trace with hash 452880306, now seen corresponding path program 3 times [2021-05-02 14:27:22,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:22,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440128265] [2021-05-02 14:27:22,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:22,656 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:22,656 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1053972506] [2021-05-02 14:27:22,657 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 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 14:27:23,088 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:27:23,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:27:23,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 14:27:23,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:23,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,184 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:27:23,185 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:23,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440128265] [2021-05-02 14:27:23,185 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:23,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1053972506] [2021-05-02 14:27:23,185 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1053972506] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:23,185 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:23,185 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:27:23,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188923981] [2021-05-02 14:27:23,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:27:23,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:23,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:27:23,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:27:23,186 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:23,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:23,226 INFO L93 Difference]: Finished difference Result 94 states and 108 transitions. [2021-05-02 14:27:23,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:27:23,226 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-02 14:27:23,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:23,228 INFO L225 Difference]: With dead ends: 94 [2021-05-02 14:27:23,228 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 14:27:23,230 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 32.9ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:27:23,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 14:27:23,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 67. [2021-05-02 14:27:23,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 53 states have internal predecessors, (62), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:27:23,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 76 transitions. [2021-05-02 14:27:23,234 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 76 transitions. Word has length 39 [2021-05-02 14:27:23,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:23,234 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 76 transitions. [2021-05-02 14:27:23,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:23,234 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 76 transitions. [2021-05-02 14:27:23,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 14:27:23,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:23,235 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:23,439 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 14:27:23,439 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:23,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:23,440 INFO L82 PathProgramCache]: Analyzing trace with hash 454667766, now seen corresponding path program 4 times [2021-05-02 14:27:23,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:23,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344641624] [2021-05-02 14:27:23,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:23,450 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:23,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1369298294] [2021-05-02 14:27:23,451 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 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 14:27:23,606 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 14:27:23,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:27:23,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 14:27:23,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:23,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:23,952 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 3 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 14:27:23,953 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:23,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344641624] [2021-05-02 14:27:23,953 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:23,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369298294] [2021-05-02 14:27:23,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369298294] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:23,953 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:23,953 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 14:27:23,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212417352] [2021-05-02 14:27:23,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 14:27:23,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:23,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 14:27:23,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 14:27:23,954 INFO L87 Difference]: Start difference. First operand 67 states and 76 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:24,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:24,197 INFO L93 Difference]: Finished difference Result 108 states and 125 transitions. [2021-05-02 14:27:24,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 14:27:24,197 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-02 14:27:24,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:24,198 INFO L225 Difference]: With dead ends: 108 [2021-05-02 14:27:24,198 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 14:27:24,198 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 248.3ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 14:27:24,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 14:27:24,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 65. [2021-05-02 14:27:24,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 50 states have (on average 1.18) internal successors, (59), 51 states have internal predecessors, (59), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:27:24,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 73 transitions. [2021-05-02 14:27:24,202 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 73 transitions. Word has length 39 [2021-05-02 14:27:24,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:24,202 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 73 transitions. [2021-05-02 14:27:24,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:24,202 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 73 transitions. [2021-05-02 14:27:24,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 14:27:24,203 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:24,203 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:24,407 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:24,407 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:24,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:24,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1559104567, now seen corresponding path program 2 times [2021-05-02 14:27:24,408 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:24,408 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333329674] [2021-05-02 14:27:24,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:24,413 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:24,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [4134573] [2021-05-02 14:27:24,413 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 14:27:24,459 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:27:24,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:27:24,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:27:24,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:24,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,503 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,530 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-02 14:27:24,531 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:24,531 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333329674] [2021-05-02 14:27:24,531 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:24,531 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4134573] [2021-05-02 14:27:24,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4134573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:24,531 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:24,531 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:27:24,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578669373] [2021-05-02 14:27:24,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:27:24,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:24,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:27:24,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:27:24,536 INFO L87 Difference]: Start difference. First operand 65 states and 73 transitions. Second operand has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:24,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:24,572 INFO L93 Difference]: Finished difference Result 96 states and 109 transitions. [2021-05-02 14:27:24,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:27:24,572 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2021-05-02 14:27:24,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:24,572 INFO L225 Difference]: With dead ends: 96 [2021-05-02 14:27:24,573 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 14:27:24,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 28.8ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:27:24,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 14:27:24,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-05-02 14:27:24,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 53 states have internal predecessors, (61), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:27:24,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2021-05-02 14:27:24,577 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 41 [2021-05-02 14:27:24,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:24,577 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2021-05-02 14:27:24,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:24,577 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2021-05-02 14:27:24,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 14:27:24,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:24,578 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:24,791 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 14:27:24,791 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:24,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:24,791 INFO L82 PathProgramCache]: Analyzing trace with hash 1179535091, now seen corresponding path program 4 times [2021-05-02 14:27:24,791 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:24,792 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027292653] [2021-05-02 14:27:24,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:24,808 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:24,808 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [363226868] [2021-05-02 14:27:24,808 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:24,860 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 14:27:24,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:27:24,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 14:27:24,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:24,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:24,994 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:27:24,995 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:24,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027292653] [2021-05-02 14:27:24,995 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:24,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363226868] [2021-05-02 14:27:24,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [363226868] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:24,995 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:24,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:27:24,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004402713] [2021-05-02 14:27:24,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:27:24,997 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:24,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:27:24,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:27:24,997 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:25,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:25,056 INFO L93 Difference]: Finished difference Result 115 states and 131 transitions. [2021-05-02 14:27:25,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 14:27:25,057 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-05-02 14:27:25,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:25,059 INFO L225 Difference]: With dead ends: 115 [2021-05-02 14:27:25,059 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 14:27:25,060 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 71.3ms TimeCoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:27:25,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 14:27:25,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 88. [2021-05-02 14:27:25,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 69 states have (on average 1.173913043478261) internal successors, (81), 70 states have internal predecessors, (81), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:27:25,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 99 transitions. [2021-05-02 14:27:25,064 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 99 transitions. Word has length 42 [2021-05-02 14:27:25,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:25,065 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 99 transitions. [2021-05-02 14:27:25,065 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:25,065 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 99 transitions. [2021-05-02 14:27:25,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 14:27:25,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:25,065 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:25,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 14:27:25,281 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:25,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:25,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1181322551, now seen corresponding path program 5 times [2021-05-02 14:27:25,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:25,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32017639] [2021-05-02 14:27:25,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:25,287 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:25,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1430598653] [2021-05-02 14:27:25,287 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 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 14:27:25,562 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 14:27:25,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:27:25,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 14:27:25,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:25,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:25,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:25,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:25,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:25,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:25,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:25,761 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 3 proven. 33 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 14:27:25,761 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:25,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32017639] [2021-05-02 14:27:25,762 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:25,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430598653] [2021-05-02 14:27:25,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430598653] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:25,762 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:25,762 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 14:27:25,762 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867875442] [2021-05-02 14:27:25,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 14:27:25,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:25,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 14:27:25,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:27:25,764 INFO L87 Difference]: Start difference. First operand 88 states and 99 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:26,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:26,019 INFO L93 Difference]: Finished difference Result 131 states and 150 transitions. [2021-05-02 14:27:26,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 14:27:26,019 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-05-02 14:27:26,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:26,020 INFO L225 Difference]: With dead ends: 131 [2021-05-02 14:27:26,020 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 14:27:26,021 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 135.4ms TimeCoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-05-02 14:27:26,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 14:27:26,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 97. [2021-05-02 14:27:26,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 76 states have (on average 1.1710526315789473) internal successors, (89), 77 states have internal predecessors, (89), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 14:27:26,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 109 transitions. [2021-05-02 14:27:26,030 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 109 transitions. Word has length 42 [2021-05-02 14:27:26,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:26,030 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 109 transitions. [2021-05-02 14:27:26,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:26,030 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 109 transitions. [2021-05-02 14:27:26,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 14:27:26,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:26,031 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:26,235 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:26,235 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:26,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:26,236 INFO L82 PathProgramCache]: Analyzing trace with hash -205316296, now seen corresponding path program 3 times [2021-05-02 14:27:26,236 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:26,236 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258964992] [2021-05-02 14:27:26,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:26,244 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:26,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [879186709] [2021-05-02 14:27:26,245 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 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 14:27:28,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:27:28,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:27:28,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 14:27:28,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:28,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,404 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-05-02 14:27:28,404 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:28,404 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258964992] [2021-05-02 14:27:28,404 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:28,404 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879186709] [2021-05-02 14:27:28,404 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879186709] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:27:28,404 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:27:28,405 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:27:28,405 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715846630] [2021-05-02 14:27:28,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:27:28,405 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:28,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:27:28,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:27:28,406 INFO L87 Difference]: Start difference. First operand 97 states and 109 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:28,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:28,425 INFO L93 Difference]: Finished difference Result 128 states and 144 transitions. [2021-05-02 14:27:28,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:27:28,425 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 44 [2021-05-02 14:27:28,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:28,426 INFO L225 Difference]: With dead ends: 128 [2021-05-02 14:27:28,426 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 14:27:28,426 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.4ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:27:28,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 14:27:28,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-05-02 14:27:28,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 77 states have internal predecessors, (88), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 14:27:28,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 108 transitions. [2021-05-02 14:27:28,431 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 108 transitions. Word has length 44 [2021-05-02 14:27:28,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:28,431 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 108 transitions. [2021-05-02 14:27:28,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:27:28,431 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 108 transitions. [2021-05-02 14:27:28,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 14:27:28,431 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:28,432 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:28,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:28,637 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:28,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:28,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1977904110, now seen corresponding path program 5 times [2021-05-02 14:27:28,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:28,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623473377] [2021-05-02 14:27:28,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:28,644 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:28,644 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1638548185] [2021-05-02 14:27:28,645 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 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 14:27:28,737 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 14:27:28,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:27:28,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 14:27:28,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:27:28,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:27:28,857 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 4 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:27:28,857 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:27:28,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623473377] [2021-05-02 14:27:28,857 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:27:28,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638548185] [2021-05-02 14:27:28,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638548185] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:27:28,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:27:28,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:27:28,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084072831] [2021-05-02 14:27:28,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:27:28,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:27:28,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:27:28,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:27:28,858 INFO L87 Difference]: Start difference. First operand 97 states and 108 transitions. Second operand has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:28,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:27:28,933 INFO L93 Difference]: Finished difference Result 156 states and 174 transitions. [2021-05-02 14:27:28,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 14:27:28,933 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-05-02 14:27:28,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:27:28,934 INFO L225 Difference]: With dead ends: 156 [2021-05-02 14:27:28,934 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 14:27:28,934 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 58.1ms TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:27:28,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 14:27:28,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 127. [2021-05-02 14:27:28,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 99 states have (on average 1.1717171717171717) internal successors, (116), 101 states have internal predecessors, (116), 15 states have call successors, (15), 13 states have call predecessors, (15), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 14:27:28,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 143 transitions. [2021-05-02 14:27:28,942 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 143 transitions. Word has length 45 [2021-05-02 14:27:28,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:27:28,942 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 143 transitions. [2021-05-02 14:27:28,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:27:28,942 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 143 transitions. [2021-05-02 14:27:28,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 14:27:28,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:27:28,943 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:27:29,148 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:27:29,148 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:27:29,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:27:29,149 INFO L82 PathProgramCache]: Analyzing trace with hash -1976116650, now seen corresponding path program 6 times [2021-05-02 14:27:29,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:27:29,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917698392] [2021-05-02 14:27:29,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:27:29,156 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:27:29,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [701466786] [2021-05-02 14:27:29,156 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true