/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/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:44:54,415 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:44:54,417 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:44:54,447 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 18:44:54,462 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:44:54,463 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:44:54,464 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:44:54,465 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:44:54,467 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:44:54,468 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:44:54,470 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:44:54,475 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:44:54,477 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:44:54,478 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:44:54,479 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:44:54,481 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:44:54,485 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:44:54,507 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:44:54,507 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:44:54,508 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:44:54,509 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:44:54,515 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:44:54,515 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:44:54,516 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:44:54,516 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:44:54,516 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:44:54,517 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:44:54,517 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:44:54,517 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:44:54,517 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:44:54,517 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:44:54,517 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:44:54,517 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:44:54,517 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:44:54,517 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:44:54,517 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:44:54,518 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:44:54,518 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:44:54,518 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:44:54,518 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:44:54,518 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:44:54,518 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:44:54,519 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:44:54,519 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:44:54,783 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:44:54,798 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:44:54,800 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:44:54,801 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:44:54,801 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:44:54,802 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c [2021-05-02 18:44:54,843 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d323c003/90e4890d298f4d1fb74fb2682c500a8b/FLAG44c5f3533 [2021-05-02 18:44:55,168 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:44:55,168 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c [2021-05-02 18:44:55,174 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d323c003/90e4890d298f4d1fb74fb2682c500a8b/FLAG44c5f3533 [2021-05-02 18:44:55,610 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d323c003/90e4890d298f4d1fb74fb2682c500a8b [2021-05-02 18:44:55,612 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:44:55,613 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:44:55,616 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:44:55,616 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:44:55,619 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:44:55,619 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:44:55" (1/1) ... [2021-05-02 18:44:55,620 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3aef90e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:44:55, skipping insertion in model container [2021-05-02 18:44:55,620 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:44:55" (1/1) ... [2021-05-02 18:44:55,625 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:44:55,633 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:44:55,711 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c[319,332] [2021-05-02 18:44:55,720 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:44:55,725 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:44:55,732 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c[319,332] [2021-05-02 18:44:55,741 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:44:55,751 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:44:55,752 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:44:55 WrapperNode [2021-05-02 18:44:55,752 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:44:55,753 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:44:55,753 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:44:55,753 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:44:55,760 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:44:55" (1/1) ... [2021-05-02 18:44:55,761 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:44:55" (1/1) ... [2021-05-02 18:44:55,766 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:44:55" (1/1) ... [2021-05-02 18:44:55,766 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:44:55" (1/1) ... [2021-05-02 18:44:55,799 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:44:55" (1/1) ... [2021-05-02 18:44:55,820 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:44:55" (1/1) ... [2021-05-02 18:44:55,825 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:44:55" (1/1) ... [2021-05-02 18:44:55,828 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:44:55,829 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:44:55,829 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:44:55,829 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:44:55,830 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:44:55" (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 18:44:55,903 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:44:55,903 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:44:55,903 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:44:55,903 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:44:55,903 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:44:55,904 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:44:55,904 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:44:55,904 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:44:55,904 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:44:55,904 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:44:55,905 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:44:55,905 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:44:55,905 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:44:55,905 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:44:55,905 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:44:55,905 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:44:55,905 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:44:56,120 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:44:56,120 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:44:56,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:44:56 BoogieIcfgContainer [2021-05-02 18:44:56,121 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:44:56,121 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:44:56,121 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:44:56,122 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:44:56,123 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:44:56" (1/1) ... [2021-05-02 18:44:56,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:44:56 BasicIcfg [2021-05-02 18:44:56,138 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:44:56,148 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:44:56,148 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:44:56,150 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:44:56,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:44:55" (1/4) ... [2021-05-02 18:44:56,151 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ab7e0df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:44:56, skipping insertion in model container [2021-05-02 18:44:56,151 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:44:55" (2/4) ... [2021-05-02 18:44:56,151 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ab7e0df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:44:56, skipping insertion in model container [2021-05-02 18:44:56,151 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:44:56" (3/4) ... [2021-05-02 18:44:56,151 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ab7e0df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:44:56, skipping insertion in model container [2021-05-02 18:44:56,151 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:44:56" (4/4) ... [2021-05-02 18:44:56,152 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_10.cJordan [2021-05-02 18:44:56,156 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:44:56,158 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:44:56,180 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:44:56,198 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:44:56,198 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:44:56,198 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:44:56,199 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:44:56,199 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:44:56,199 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:44:56,199 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:44:56,199 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:44:56,210 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:44:56,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:44:56,216 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:44:56,216 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:44:56,216 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:44:56,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:44:56,222 INFO L82 PathProgramCache]: Analyzing trace with hash 447419557, now seen corresponding path program 1 times [2021-05-02 18:44:56,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:44:56,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855620844] [2021-05-02 18:44:56,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:44:56,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:56,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:44:56,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:56,344 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 18:44:56,345 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:44:56,345 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855620844] [2021-05-02 18:44:56,345 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [855620844] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:44:56,345 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:44:56,346 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:44:56,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000319857] [2021-05-02 18:44:56,349 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:44:56,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:44:56,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:44:56,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:44:56,366 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 18:44:56,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:44:56,416 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-05-02 18:44:56,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:44:56,417 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11 [2021-05-02 18:44:56,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:44:56,428 INFO L225 Difference]: With dead ends: 21 [2021-05-02 18:44:56,429 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 18:44:56,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:44:56,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 18:44:56,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 18:44:56,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 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 18:44:56,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 18:44:56,451 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 18:44:56,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:44:56,451 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 18:44:56,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 18:44:56,451 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 18:44:56,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:44:56,452 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:44:56,452 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:44:56,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:44:56,452 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:44:56,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:44:56,453 INFO L82 PathProgramCache]: Analyzing trace with hash 448343078, now seen corresponding path program 1 times [2021-05-02 18:44:56,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:44:56,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437675894] [2021-05-02 18:44:56,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:44:56,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:56,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:44:56,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:56,623 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 18:44:56,623 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:44:56,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437675894] [2021-05-02 18:44:56,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437675894] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:44:56,625 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:44:56,625 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:44:56,625 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508835863] [2021-05-02 18:44:56,626 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:44:56,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:44:56,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:44:56,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:44:56,628 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 18:44:56,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:44:56,720 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-05-02 18:44:56,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:44:56,721 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 11 [2021-05-02 18:44:56,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:44:56,722 INFO L225 Difference]: With dead ends: 17 [2021-05-02 18:44:56,722 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 18:44:56,723 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 96.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:44:56,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 18:44:56,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 18:44:56,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 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 18:44:56,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 18:44:56,728 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-02 18:44:56,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:44:56,729 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 18:44:56,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 18:44:56,729 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 18:44:56,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 18:44:56,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:44:56,729 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:44:56,729 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:44:56,730 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:44:56,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:44:56,730 INFO L82 PathProgramCache]: Analyzing trace with hash -1516694440, now seen corresponding path program 1 times [2021-05-02 18:44:56,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:44:56,731 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731300701] [2021-05-02 18:44:56,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:44:56,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:56,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:44:56,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:56,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:44:56,854 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:44:56,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731300701] [2021-05-02 18:44:56,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731300701] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:44:56,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218934486] [2021-05-02 18:44:56,857 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 18:44:56,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:56,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 18:44:56,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:44:56,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:44:57,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:44:57,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [218934486] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:44:57,015 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:44:57,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 7 [2021-05-02 18:44:57,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839716303] [2021-05-02 18:44:57,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:44:57,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:44:57,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:44:57,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:44:57,016 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:57,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:44:57,093 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-02 18:44:57,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:44:57,093 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 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 18:44:57,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:44:57,094 INFO L225 Difference]: With dead ends: 20 [2021-05-02 18:44:57,094 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 18:44:57,094 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 98.0ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:44:57,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 18:44:57,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 18:44:57,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:57,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 18:44:57,096 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 18:44:57,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:44:57,097 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 18:44:57,097 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:57,097 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 18:44:57,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:44:57,097 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:44:57,097 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:44:57,314 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 18:44:57,314 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:44:57,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:44:57,315 INFO L82 PathProgramCache]: Analyzing trace with hash -1545148698, now seen corresponding path program 2 times [2021-05-02 18:44:57,315 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:44:57,315 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823112097] [2021-05-02 18:44:57,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:44:57,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:57,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:44:57,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:57,427 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:44:57,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:44:57,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823112097] [2021-05-02 18:44:57,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823112097] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:44:57,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584699047] [2021-05-02 18:44:57,428 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 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 18:44:57,485 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:44:57,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:44:57,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 18:44:57,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:44:57,580 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:44:57,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584699047] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:44:57,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:44:57,582 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 10 [2021-05-02 18:44:57,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172977182] [2021-05-02 18:44:57,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 18:44:57,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:44:57,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 18:44:57,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:44:57,586 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:57,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:44:57,732 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2021-05-02 18:44:57,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:44:57,732 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 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 18:44:57,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:44:57,733 INFO L225 Difference]: With dead ends: 23 [2021-05-02 18:44:57,733 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 18:44:57,733 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 173.8ms TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:44:57,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 18:44:57,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 18:44:57,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:57,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 18:44:57,735 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-05-02 18:44:57,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:44:57,735 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 18:44:57,736 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:57,736 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 18:44:57,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 18:44:57,736 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:44:57,736 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:44:57,959 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:44:57,960 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:44:57,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:44:57,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1177575832, now seen corresponding path program 3 times [2021-05-02 18:44:57,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:44:57,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864784134] [2021-05-02 18:44:57,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:44:57,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:58,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:44:58,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:58,111 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:44:58,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:44:58,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864784134] [2021-05-02 18:44:58,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864784134] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:44:58,112 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560595637] [2021-05-02 18:44:58,112 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 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 18:44:58,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:44:58,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:44:58,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 18:44:58,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:44:58,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:44:58,265 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 18:44:58,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560595637] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:44:58,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:44:58,265 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 11 [2021-05-02 18:44:58,265 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531168003] [2021-05-02 18:44:58,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:44:58,266 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:44:58,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:44:58,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:44:58,266 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:58,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:44:58,642 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-05-02 18:44:58,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:44:58,642 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 18:44:58,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:44:58,643 INFO L225 Difference]: With dead ends: 33 [2021-05-02 18:44:58,643 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 18:44:58,643 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 412.0ms TimeCoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:44:58,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 18:44:58,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2021-05-02 18:44:58,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:58,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-05-02 18:44:58,650 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 20 [2021-05-02 18:44:58,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:44:58,650 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-05-02 18:44:58,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:58,650 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-05-02 18:44:58,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:44:58,651 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:44:58,651 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:44:58,851 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:44:58,851 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:44:58,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:44:58,852 INFO L82 PathProgramCache]: Analyzing trace with hash -657264347, now seen corresponding path program 1 times [2021-05-02 18:44:58,852 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:44:58,852 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597995442] [2021-05-02 18:44:58,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:44:58,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:58,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:44:58,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:58,984 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:44:58,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:44:58,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597995442] [2021-05-02 18:44:58,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597995442] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:44:58,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [233308010] [2021-05-02 18:44:58,984 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 18:44:59,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:59,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:44:59,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:44:59,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:44:59,115 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:44:59,115 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [233308010] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:44:59,115 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:44:59,115 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 18:44:59,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216394261] [2021-05-02 18:44:59,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 18:44:59,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:44:59,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 18:44:59,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:44:59,116 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:59,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:44:59,337 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-05-02 18:44:59,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 18:44:59,337 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 18:44:59,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:44:59,338 INFO L225 Difference]: With dead ends: 34 [2021-05-02 18:44:59,338 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 18:44:59,338 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 183.2ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:44:59,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 18:44:59,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 18:44:59,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:59,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-05-02 18:44:59,341 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 29 [2021-05-02 18:44:59,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:44:59,341 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-05-02 18:44:59,341 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:44:59,341 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-05-02 18:44:59,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 18:44:59,342 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:44:59,342 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:44:59,557 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:44:59,557 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:44:59,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:44:59,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1647316777, now seen corresponding path program 2 times [2021-05-02 18:44:59,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:44:59,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378745018] [2021-05-02 18:44:59,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:44:59,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:59,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:44:59,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:44:59,648 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:44:59,648 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:44:59,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378745018] [2021-05-02 18:44:59,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [378745018] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:44:59,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96898107] [2021-05-02 18:44:59,649 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:44:59,691 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:44:59,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:44:59,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 18:44:59,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:44:59,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:44:59,769 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:44:59,769 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96898107] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:44:59,769 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:44:59,769 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 18:44:59,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697145329] [2021-05-02 18:44:59,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:44:59,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:44:59,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:44:59,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:44:59,770 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:00,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:00,022 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2021-05-02 18:45:00,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:45:00,023 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 18:45:00,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:00,023 INFO L225 Difference]: With dead ends: 37 [2021-05-02 18:45:00,023 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 18:45:00,024 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 206.0ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:45:00,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 18:45:00,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-05-02 18:45:00,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:00,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-05-02 18:45:00,026 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 32 [2021-05-02 18:45:00,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:00,026 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-05-02 18:45:00,026 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:00,027 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-05-02 18:45:00,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 18:45:00,027 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:00,027 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:00,246 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 18:45:00,247 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:00,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:00,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1536130021, now seen corresponding path program 3 times [2021-05-02 18:45:00,247 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:00,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064161046] [2021-05-02 18:45:00,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:00,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:00,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:00,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:00,350 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 15 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:45:00,350 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:00,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064161046] [2021-05-02 18:45:00,350 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064161046] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:00,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675176325] [2021-05-02 18:45:00,350 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 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 18:45:00,422 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 18:45:00,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:00,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 18:45:00,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:00,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:00,527 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 33 proven. 2 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:45:00,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675176325] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:00,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:00,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 15 [2021-05-02 18:45:00,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972993340] [2021-05-02 18:45:00,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 18:45:00,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:00,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 18:45:00,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:45:00,529 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:01,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:01,343 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-05-02 18:45:01,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 18:45:01,343 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 18:45:01,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:01,343 INFO L225 Difference]: With dead ends: 51 [2021-05-02 18:45:01,344 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 18:45:01,344 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 735.9ms TimeCoverageRelationStatistics Valid=211, Invalid=659, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:45:01,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 18:45:01,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 45. [2021-05-02 18:45:01,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:01,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-02 18:45:01,347 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 35 [2021-05-02 18:45:01,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:01,347 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-02 18:45:01,347 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:01,347 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-02 18:45:01,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 18:45:01,348 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:01,348 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:01,560 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:45:01,561 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:01,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:01,561 INFO L82 PathProgramCache]: Analyzing trace with hash 993036856, now seen corresponding path program 4 times [2021-05-02 18:45:01,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:01,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289245657] [2021-05-02 18:45:01,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:01,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:01,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:01,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:01,682 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 48 proven. 126 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:45:01,682 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:01,682 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289245657] [2021-05-02 18:45:01,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289245657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:01,682 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1644798131] [2021-05-02 18:45:01,682 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 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 18:45:01,729 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:45:01,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:01,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:45:01,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:01,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:01,816 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 48 proven. 126 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:45:01,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1644798131] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:01,816 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:01,816 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 18:45:01,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689114275] [2021-05-02 18:45:01,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:45:01,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:01,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:45:01,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:45:01,817 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:02,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:02,313 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2021-05-02 18:45:02,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:45:02,314 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 18:45:02,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:02,317 INFO L225 Difference]: With dead ends: 49 [2021-05-02 18:45:02,318 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 18:45:02,318 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 367.6ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:45:02,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 18:45:02,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-05-02 18:45:02,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:02,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2021-05-02 18:45:02,326 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 44 [2021-05-02 18:45:02,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:02,326 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2021-05-02 18:45:02,326 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:02,326 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2021-05-02 18:45:02,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 18:45:02,327 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:02,327 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:02,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:45:02,533 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:02,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:02,533 INFO L82 PathProgramCache]: Analyzing trace with hash -2111705018, now seen corresponding path program 5 times [2021-05-02 18:45:02,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:02,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204072397] [2021-05-02 18:45:02,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:02,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:02,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:02,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:02,733 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 53 proven. 155 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:45:02,733 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:02,733 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204072397] [2021-05-02 18:45:02,733 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204072397] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:02,733 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707420779] [2021-05-02 18:45:02,733 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 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 18:45:02,979 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 18:45:02,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:02,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 18:45:02,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:03,146 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 53 proven. 155 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:45:03,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707420779] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:03,147 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:03,147 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 16 [2021-05-02 18:45:03,147 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208610178] [2021-05-02 18:45:03,147 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:45:03,147 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:03,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:45:03,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:45:03,148 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:03,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:03,726 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2021-05-02 18:45:03,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 18:45:03,727 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 18:45:03,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:03,728 INFO L225 Difference]: With dead ends: 52 [2021-05-02 18:45:03,728 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 18:45:03,729 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 37 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 465.8ms TimeCoverageRelationStatistics Valid=104, Invalid=652, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:45:03,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 18:45:03,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 18:45:03,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:03,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 18:45:03,735 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2021-05-02 18:45:03,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:03,736 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 18:45:03,736 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:03,737 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 18:45:03,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 18:45:03,741 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:03,741 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:03,946 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:45:03,946 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:03,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:03,947 INFO L82 PathProgramCache]: Analyzing trace with hash 938813304, now seen corresponding path program 6 times [2021-05-02 18:45:03,947 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:03,947 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281751438] [2021-05-02 18:45:03,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:03,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:04,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:04,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:04,184 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 58 proven. 187 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:45:04,184 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:04,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281751438] [2021-05-02 18:45:04,184 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [281751438] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:04,184 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393763069] [2021-05-02 18:45:04,184 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 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 18:45:04,326 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-02 18:45:04,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:04,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:45:04,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:04,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:04,694 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 85 proven. 7 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:45:04,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393763069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:04,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:04,695 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 21 [2021-05-02 18:45:04,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285430960] [2021-05-02 18:45:04,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 18:45:04,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:04,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 18:45:04,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 18:45:04,696 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 21 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 20 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:06,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:06,133 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2021-05-02 18:45:06,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 18:45:06,134 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 20 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 18:45:06,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:06,134 INFO L225 Difference]: With dead ends: 63 [2021-05-02 18:45:06,135 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 18:45:06,135 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 1315.1ms TimeCoverageRelationStatistics Valid=251, Invalid=1309, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 18:45:06,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 18:45:06,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-05-02 18:45:06,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:06,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 18:45:06,138 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 50 [2021-05-02 18:45:06,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:06,138 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 18:45:06,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 20 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:06,138 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 18:45:06,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 18:45:06,139 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:06,139 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:06,349 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:45:06,349 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:06,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:06,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1269919931, now seen corresponding path program 7 times [2021-05-02 18:45:06,351 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:06,351 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427881401] [2021-05-02 18:45:06,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:06,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:06,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:06,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:06,804 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 109 proven. 260 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:45:06,805 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:06,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427881401] [2021-05-02 18:45:06,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427881401] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:06,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785900332] [2021-05-02 18:45:06,805 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:45:06,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:06,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 18:45:06,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:06,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:06,994 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 109 proven. 260 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:45:06,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1785900332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:06,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:06,994 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 18:45:06,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552934703] [2021-05-02 18:45:06,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:45:06,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:06,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:45:06,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:45:06,996 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:07,442 WARN L205 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 18:45:07,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:07,978 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2021-05-02 18:45:07,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 18:45:07,979 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 18:45:07,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:07,980 INFO L225 Difference]: With dead ends: 65 [2021-05-02 18:45:07,980 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 18:45:07,980 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 945.6ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:45:07,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 18:45:07,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-02 18:45:07,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 59 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:08,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2021-05-02 18:45:08,001 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2021-05-02 18:45:08,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:08,001 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2021-05-02 18:45:08,001 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:08,002 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2021-05-02 18:45:08,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 18:45:08,010 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:08,010 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:08,226 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:45:08,226 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:08,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:08,227 INFO L82 PathProgramCache]: Analyzing trace with hash 27167607, now seen corresponding path program 8 times [2021-05-02 18:45:08,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:08,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546788885] [2021-05-02 18:45:08,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:08,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:08,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:08,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:08,504 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 117 proven. 301 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:45:08,504 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:08,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546788885] [2021-05-02 18:45:08,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546788885] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:08,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188246206] [2021-05-02 18:45:08,505 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 18:45:08,546 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:45:08,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:08,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 18:45:08,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:08,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:08,681 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 117 proven. 301 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:45:08,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188246206] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:08,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:08,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 18:45:08,682 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359162992] [2021-05-02 18:45:08,682 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 18:45:08,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:08,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 18:45:08,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:45:08,683 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:09,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:09,464 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2021-05-02 18:45:09,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 18:45:09,464 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 18:45:09,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:09,465 INFO L225 Difference]: With dead ends: 68 [2021-05-02 18:45:09,465 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 18:45:09,466 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 557.2ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:45:09,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 18:45:09,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-05-02 18:45:09,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:09,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-02 18:45:09,468 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 62 [2021-05-02 18:45:09,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:09,468 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-02 18:45:09,469 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:09,469 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-02 18:45:09,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 18:45:09,469 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:09,469 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:09,689 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 18:45:09,689 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:09,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:09,689 INFO L82 PathProgramCache]: Analyzing trace with hash -258749947, now seen corresponding path program 9 times [2021-05-02 18:45:09,689 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:09,690 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397523511] [2021-05-02 18:45:09,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:09,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:09,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:09,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:09,953 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 125 proven. 345 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:45:09,953 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:09,954 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397523511] [2021-05-02 18:45:09,954 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397523511] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:09,954 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714820370] [2021-05-02 18:45:09,954 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 18:45:10,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-02 18:45:10,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:10,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 18:45:10,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:10,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:10,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:10,591 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 161 proven. 15 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-05-02 18:45:10,591 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714820370] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:10,591 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:10,591 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 9] total 26 [2021-05-02 18:45:10,591 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247269394] [2021-05-02 18:45:10,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:45:10,592 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:10,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:45:10,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:45:10,592 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 25 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:12,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:12,629 INFO L93 Difference]: Finished difference Result 78 states and 80 transitions. [2021-05-02 18:45:12,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 18:45:12,630 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 25 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 18:45:12,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:12,631 INFO L225 Difference]: With dead ends: 78 [2021-05-02 18:45:12,631 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 18:45:12,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 57 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 1847.0ms TimeCoverageRelationStatistics Valid=324, Invalid=2126, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:45:12,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 18:45:12,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2021-05-02 18:45:12,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0422535211267605) internal successors, (74), 71 states have internal predecessors, (74), 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 18:45:12,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2021-05-02 18:45:12,634 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 65 [2021-05-02 18:45:12,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:12,634 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2021-05-02 18:45:12,634 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 25 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:12,635 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2021-05-02 18:45:12,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 18:45:12,635 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:12,635 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:12,838 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:45:12,839 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:12,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:12,839 INFO L82 PathProgramCache]: Analyzing trace with hash 2020431896, now seen corresponding path program 10 times [2021-05-02 18:45:12,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:12,839 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126042171] [2021-05-02 18:45:12,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:12,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:13,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:13,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:13,142 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 194 proven. 442 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:45:13,142 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:13,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126042171] [2021-05-02 18:45:13,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126042171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:13,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203785488] [2021-05-02 18:45:13,143 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:45:13,197 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:45:13,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:13,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 18:45:13,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:13,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:13,363 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 98 proven. 551 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:45:13,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [203785488] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:13,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:13,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 22] total 24 [2021-05-02 18:45:13,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341993463] [2021-05-02 18:45:13,364 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:45:13,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:13,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:45:13,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:45:13,365 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:14,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:14,599 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2021-05-02 18:45:14,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 18:45:14,599 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-02 18:45:14,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:14,600 INFO L225 Difference]: With dead ends: 86 [2021-05-02 18:45:14,600 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 18:45:14,600 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 881.8ms TimeCoverageRelationStatistics Valid=161, Invalid=1731, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:45:14,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 18:45:14,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 18:45:14,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 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 18:45:14,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-02 18:45:14,603 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 74 [2021-05-02 18:45:14,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:14,603 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-02 18:45:14,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:14,603 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-02 18:45:14,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 18:45:14,607 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:14,607 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 20, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:14,822 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:45:14,823 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:14,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:14,823 INFO L82 PathProgramCache]: Analyzing trace with hash 387398758, now seen corresponding path program 11 times [2021-05-02 18:45:14,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:14,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209259659] [2021-05-02 18:45:14,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:14,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:15,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:15,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:15,457 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 227 proven. 610 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:45:15,457 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:15,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209259659] [2021-05-02 18:45:15,457 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209259659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:15,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970155348] [2021-05-02 18:45:15,457 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 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 18:45:22,327 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 18:45:22,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:22,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 18:45:22,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:22,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:22,637 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 113 proven. 737 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:45:22,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970155348] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:22,637 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:22,637 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25] total 27 [2021-05-02 18:45:22,637 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753592119] [2021-05-02 18:45:22,638 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 18:45:22,638 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:22,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 18:45:22,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=630, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:45:22,638 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:23,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:23,818 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2021-05-02 18:45:23,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:45:23,818 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-02 18:45:23,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:23,820 INFO L225 Difference]: With dead ends: 95 [2021-05-02 18:45:23,820 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 18:45:23,821 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 72 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 1256.8ms TimeCoverageRelationStatistics Valid=185, Invalid=2265, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:45:23,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 18:45:23,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-05-02 18:45:23,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 89 states have internal predecessors, (92), 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 18:45:23,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2021-05-02 18:45:23,824 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 83 [2021-05-02 18:45:23,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:23,824 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2021-05-02 18:45:23,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:23,825 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2021-05-02 18:45:23,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 18:45:23,825 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:23,825 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 23, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:24,030 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:45:24,031 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:24,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:24,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1112649768, now seen corresponding path program 12 times [2021-05-02 18:45:24,031 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:24,032 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41405517] [2021-05-02 18:45:24,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:24,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:24,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:24,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:24,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 260 proven. 805 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:45:24,450 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:24,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41405517] [2021-05-02 18:45:24,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41405517] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:24,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955515670] [2021-05-02 18:45:24,450 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 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 18:45:24,658 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 18:45:24,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:24,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 18:45:24,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:25,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:25,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:25,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:25,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 392 proven. 243 refuted. 0 times theorem prover too weak. 445 trivial. 0 not checked. [2021-05-02 18:45:25,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955515670] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:25,431 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:25,431 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 17] total 42 [2021-05-02 18:45:25,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766093491] [2021-05-02 18:45:25,431 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 18:45:25,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:25,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 18:45:25,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1558, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:45:25,432 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 42 states, 42 states have (on average 2.7142857142857144) internal successors, (114), 41 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:28,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:28,924 INFO L93 Difference]: Finished difference Result 117 states and 124 transitions. [2021-05-02 18:45:28,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:45:28,925 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.7142857142857144) internal successors, (114), 41 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-05-02 18:45:28,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:28,926 INFO L225 Difference]: With dead ends: 117 [2021-05-02 18:45:28,926 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 18:45:28,927 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 927 ImplicationChecksByTransitivity, 3684.3ms TimeCoverageRelationStatistics Valid=1169, Invalid=5473, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 18:45:28,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 18:45:28,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 102. [2021-05-02 18:45:28,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 97 states have internal predecessors, (100), 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 18:45:28,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 104 transitions. [2021-05-02 18:45:28,930 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 104 transitions. Word has length 92 [2021-05-02 18:45:28,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:28,930 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 104 transitions. [2021-05-02 18:45:28,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.7142857142857144) internal successors, (114), 41 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:28,930 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 104 transitions. [2021-05-02 18:45:28,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 18:45:28,930 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:28,931 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 25, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:29,134 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 18:45:29,135 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:29,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:29,138 INFO L82 PathProgramCache]: Analyzing trace with hash -10052891, now seen corresponding path program 13 times [2021-05-02 18:45:29,139 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:29,139 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [620350776] [2021-05-02 18:45:29,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:29,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:29,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:29,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:29,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 359 proven. 950 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:45:29,649 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:29,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [620350776] [2021-05-02 18:45:29,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [620350776] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:29,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637859077] [2021-05-02 18:45:29,650 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:45:29,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:29,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 18:45:29,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:29,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:29,874 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 359 proven. 950 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:45:29,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1637859077] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:29,874 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:29,874 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 18:45:29,874 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90895397] [2021-05-02 18:45:29,875 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:45:29,875 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:29,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:45:29,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:45:29,875 INFO L87 Difference]: Start difference. First operand 102 states and 104 transitions. Second operand has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:31,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:31,487 INFO L93 Difference]: Finished difference Result 106 states and 108 transitions. [2021-05-02 18:45:31,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 18:45:31,488 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 18:45:31,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:31,488 INFO L225 Difference]: With dead ends: 106 [2021-05-02 18:45:31,488 INFO L226 Difference]: Without dead ends: 106 [2021-05-02 18:45:31,491 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1161.3ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:45:31,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-02 18:45:31,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2021-05-02 18:45:31,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 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 18:45:31,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2021-05-02 18:45:31,493 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 101 [2021-05-02 18:45:31,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:31,493 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2021-05-02 18:45:31,493 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:31,493 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2021-05-02 18:45:31,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 18:45:31,494 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:31,494 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 26, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:31,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:45:31,705 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:31,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:31,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1774401687, now seen corresponding path program 14 times [2021-05-02 18:45:31,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:31,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933118765] [2021-05-02 18:45:31,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:31,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:32,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:32,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:32,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 373 proven. 1027 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:45:32,188 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:32,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933118765] [2021-05-02 18:45:32,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933118765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:32,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662366462] [2021-05-02 18:45:32,188 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 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 18:45:32,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:45:32,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:32,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 18:45:32,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:32,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:32,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 373 proven. 1027 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:45:32,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662366462] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:32,430 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:32,430 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 18:45:32,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926284182] [2021-05-02 18:45:32,431 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 18:45:32,431 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:32,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 18:45:32,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 18:45:32,432 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:34,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:34,210 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2021-05-02 18:45:34,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 18:45:34,216 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-02 18:45:34,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:34,217 INFO L225 Difference]: With dead ends: 109 [2021-05-02 18:45:34,217 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 18:45:34,218 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1343.6ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 18:45:34,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 18:45:34,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2021-05-02 18:45:34,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.029126213592233) internal successors, (106), 103 states have internal predecessors, (106), 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 18:45:34,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2021-05-02 18:45:34,220 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 104 [2021-05-02 18:45:34,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:34,220 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2021-05-02 18:45:34,220 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:34,220 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2021-05-02 18:45:34,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 18:45:34,221 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:34,221 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 27, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:34,424 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:45:34,425 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:34,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:34,425 INFO L82 PathProgramCache]: Analyzing trace with hash -644455003, now seen corresponding path program 15 times [2021-05-02 18:45:34,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:34,425 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887588283] [2021-05-02 18:45:34,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:34,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:34,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:34,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:34,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 387 proven. 1107 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:45:34,926 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:34,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887588283] [2021-05-02 18:45:34,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887588283] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:34,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353840556] [2021-05-02 18:45:34,926 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 18:45:35,063 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 18:45:35,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:35,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 18:45:35,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:35,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:35,685 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 453 proven. 40 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2021-05-02 18:45:35,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353840556] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:35,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:35,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 11] total 40 [2021-05-02 18:45:35,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724728827] [2021-05-02 18:45:35,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 18:45:35,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:35,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 18:45:35,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 18:45:35,686 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand has 40 states, 40 states have (on average 2.9) internal successors, (116), 39 states have internal predecessors, (116), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:40,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:40,012 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2021-05-02 18:45:40,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 18:45:40,013 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.9) internal successors, (116), 39 states have internal predecessors, (116), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-02 18:45:40,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:40,014 INFO L225 Difference]: With dead ends: 120 [2021-05-02 18:45:40,014 INFO L226 Difference]: Without dead ends: 120 [2021-05-02 18:45:40,015 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 725 ImplicationChecksByTransitivity, 3323.6ms TimeCoverageRelationStatistics Valid=534, Invalid=5472, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 18:45:40,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-02 18:45:40,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2021-05-02 18:45:40,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0265486725663717) internal successors, (116), 113 states have internal predecessors, (116), 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 18:45:40,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2021-05-02 18:45:40,017 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 107 [2021-05-02 18:45:40,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:40,017 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2021-05-02 18:45:40,017 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.9) internal successors, (116), 39 states have internal predecessors, (116), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:40,017 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2021-05-02 18:45:40,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-02 18:45:40,018 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:40,018 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 29, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:40,221 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:45:40,221 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:40,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:40,222 INFO L82 PathProgramCache]: Analyzing trace with hash -673118088, now seen corresponding path program 16 times [2021-05-02 18:45:40,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:40,222 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257159739] [2021-05-02 18:45:40,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:40,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:40,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:40,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:40,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 504 proven. 1276 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:45:40,800 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:40,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257159739] [2021-05-02 18:45:40,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257159739] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:40,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169065237] [2021-05-02 18:45:40,800 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 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 18:45:40,855 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:45:40,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:45:40,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 18:45:40,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:45:41,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:45:41,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 504 proven. 1276 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:45:41,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169065237] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:41,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:45:41,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 18:45:41,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446466723] [2021-05-02 18:45:41,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 18:45:41,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:45:41,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 18:45:41,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:45:41,039 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:43,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:45:43,073 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2021-05-02 18:45:43,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 18:45:43,074 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 116 [2021-05-02 18:45:43,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:45:43,075 INFO L225 Difference]: With dead ends: 122 [2021-05-02 18:45:43,075 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 18:45:43,076 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 1493.1ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 18:45:43,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 18:45:43,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-05-02 18:45:43,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 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 18:45:43,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-05-02 18:45:43,089 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 116 [2021-05-02 18:45:43,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:45:43,089 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-05-02 18:45:43,089 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:45:43,089 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-05-02 18:45:43,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-02 18:45:43,090 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:45:43,090 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 30, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:45:43,306 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:45:43,306 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:45:43,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:45:43,306 INFO L82 PathProgramCache]: Analyzing trace with hash 914559110, now seen corresponding path program 17 times [2021-05-02 18:45:43,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:45:43,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729801887] [2021-05-02 18:45:43,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:45:43,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:43,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:45:43,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:45:43,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 521 proven. 1365 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:45:43,952 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:45:43,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729801887] [2021-05-02 18:45:43,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729801887] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:45:43,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779290595] [2021-05-02 18:45:43,952 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:46:03,349 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 37 check-sat command(s) [2021-05-02 18:46:03,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:46:03,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 96 conjunts are in the unsatisfiable core [2021-05-02 18:46:03,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:46:03,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:46:04,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 521 proven. 1365 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:46:04,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779290595] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:04,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:46:04,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 18:46:04,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381105299] [2021-05-02 18:46:04,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 18:46:04,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:46:04,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 18:46:04,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 18:46:04,023 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:06,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:46:06,239 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-05-02 18:46:06,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 18:46:06,241 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-02 18:46:06,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:46:06,241 INFO L225 Difference]: With dead ends: 125 [2021-05-02 18:46:06,242 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 18:46:06,242 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 92 SyntacticMatches, 30 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 2021.4ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:46:06,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 18:46:06,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-05-02 18:46:06,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0252100840336134) internal successors, (122), 119 states have internal predecessors, (122), 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 18:46:06,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2021-05-02 18:46:06,245 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 119 [2021-05-02 18:46:06,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:46:06,245 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2021-05-02 18:46:06,245 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:06,245 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2021-05-02 18:46:06,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-02 18:46:06,246 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:46:06,246 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 31, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:46:06,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 18:46:06,452 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:46:06,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:46:06,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1068866120, now seen corresponding path program 18 times [2021-05-02 18:46:06,452 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:46:06,452 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8538078] [2021-05-02 18:46:06,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:46:06,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:07,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:46:07,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:07,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 538 proven. 1457 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:46:07,198 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:46:07,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8538078] [2021-05-02 18:46:07,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8538078] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:07,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166363030] [2021-05-02 18:46:07,198 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:46:08,036 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2021-05-02 18:46:08,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:46:08,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:46:08,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:46:08,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:46:08,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:46:08,961 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 613 proven. 57 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2021-05-02 18:46:08,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [166363030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:08,962 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:46:08,962 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 12] total 45 [2021-05-02 18:46:08,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765759233] [2021-05-02 18:46:08,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 18:46:08,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:46:08,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 18:46:08,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 18:46:08,963 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:14,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:46:14,146 INFO L93 Difference]: Finished difference Result 135 states and 137 transitions. [2021-05-02 18:46:14,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:46:14,147 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2021-05-02 18:46:14,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:46:14,147 INFO L225 Difference]: With dead ends: 135 [2021-05-02 18:46:14,147 INFO L226 Difference]: Without dead ends: 135 [2021-05-02 18:46:14,149 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 113 SyntacticMatches, 3 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 933 ImplicationChecksByTransitivity, 4208.6ms TimeCoverageRelationStatistics Valid=607, Invalid=7049, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 18:46:14,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-02 18:46:14,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 133. [2021-05-02 18:46:14,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 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 18:46:14,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-02 18:46:14,151 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 122 [2021-05-02 18:46:14,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:46:14,151 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-02 18:46:14,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:14,151 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-02 18:46:14,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 18:46:14,152 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:46:14,152 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 33, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:46:14,360 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 18:46:14,361 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:46:14,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:46:14,361 INFO L82 PathProgramCache]: Analyzing trace with hash -304551675, now seen corresponding path program 19 times [2021-05-02 18:46:14,361 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:46:14,361 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826800557] [2021-05-02 18:46:14,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:46:14,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:15,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:46:15,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:15,128 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 673 proven. 1650 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:46:15,128 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:46:15,128 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826800557] [2021-05-02 18:46:15,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826800557] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:15,128 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617556236] [2021-05-02 18:46:15,128 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:46:15,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:15,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 69 conjunts are in the unsatisfiable core [2021-05-02 18:46:15,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:46:15,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:46:15,402 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 673 proven. 1650 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:46:15,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617556236] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:15,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:46:15,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 18:46:15,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756037784] [2021-05-02 18:46:15,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 18:46:15,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:46:15,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 18:46:15,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:46:15,404 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:17,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:46:17,920 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2021-05-02 18:46:17,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 18:46:17,921 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-02 18:46:17,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:46:17,927 INFO L225 Difference]: With dead ends: 137 [2021-05-02 18:46:17,927 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 18:46:17,927 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 1813.4ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 18:46:17,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 18:46:17,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2021-05-02 18:46:17,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.0229007633587786) internal successors, (134), 131 states have internal predecessors, (134), 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 18:46:17,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2021-05-02 18:46:17,930 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 131 [2021-05-02 18:46:17,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:46:17,930 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2021-05-02 18:46:17,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:17,930 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2021-05-02 18:46:17,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-02 18:46:17,930 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:46:17,930 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 34, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:46:18,133 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:46:18,133 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:46:18,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:46:18,133 INFO L82 PathProgramCache]: Analyzing trace with hash 467665719, now seen corresponding path program 20 times [2021-05-02 18:46:18,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:46:18,134 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532306308] [2021-05-02 18:46:18,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:46:18,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:18,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:46:18,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:18,871 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 693 proven. 1751 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:46:18,872 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:46:18,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532306308] [2021-05-02 18:46:18,872 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532306308] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:18,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109219782] [2021-05-02 18:46:18,872 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:46:18,920 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:46:18,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:46:18,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-02 18:46:18,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:46:19,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:46:19,143 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 693 proven. 1751 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:46:19,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109219782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:19,143 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:46:19,143 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-02 18:46:19,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666307810] [2021-05-02 18:46:19,144 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 18:46:19,147 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:46:19,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 18:46:19,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 18:46:19,147 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:21,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:46:21,756 INFO L93 Difference]: Finished difference Result 140 states and 142 transitions. [2021-05-02 18:46:21,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 18:46:21,757 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-05-02 18:46:21,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:46:21,757 INFO L225 Difference]: With dead ends: 140 [2021-05-02 18:46:21,758 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 18:46:21,758 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 1857.8ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 18:46:21,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 18:46:21,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 18:46:21,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 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 18:46:21,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 18:46:21,760 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 134 [2021-05-02 18:46:21,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:46:21,761 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 18:46:21,761 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:21,761 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 18:46:21,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 18:46:21,761 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:46:21,761 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 35, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:46:21,979 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 18:46:21,979 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:46:21,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:46:21,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1751212997, now seen corresponding path program 21 times [2021-05-02 18:46:21,979 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:46:21,979 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436312938] [2021-05-02 18:46:21,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:46:21,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:22,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:46:22,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:22,790 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 713 proven. 1855 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:46:22,790 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:46:22,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436312938] [2021-05-02 18:46:22,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436312938] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:22,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107191852] [2021-05-02 18:46:22,790 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:46:22,988 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-05-02 18:46:22,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:46:22,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 18:46:22,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:46:24,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:46:24,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 713 proven. 517 refuted. 0 times theorem prover too weak. 1395 trivial. 0 not checked. [2021-05-02 18:46:24,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2107191852] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:24,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:46:24,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 17] total 54 [2021-05-02 18:46:24,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115878201] [2021-05-02 18:46:24,365 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 18:46:24,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:46:24,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 18:46:24,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=2690, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:46:24,365 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 54 states, 54 states have (on average 2.9074074074074074) internal successors, (157), 53 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:31,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:46:31,693 INFO L93 Difference]: Finished difference Result 153 states and 156 transitions. [2021-05-02 18:46:31,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 18:46:31,693 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.9074074074074074) internal successors, (157), 53 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-02 18:46:31,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:46:31,694 INFO L225 Difference]: With dead ends: 153 [2021-05-02 18:46:31,694 INFO L226 Difference]: Without dead ends: 153 [2021-05-02 18:46:31,695 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 121 SyntacticMatches, 5 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1580 ImplicationChecksByTransitivity, 6265.7ms TimeCoverageRelationStatistics Valid=844, Invalid=9868, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 18:46:31,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-05-02 18:46:31,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 148. [2021-05-02 18:46:31,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.020979020979021) internal successors, (146), 143 states have internal predecessors, (146), 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 18:46:31,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2021-05-02 18:46:31,697 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 137 [2021-05-02 18:46:31,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:46:31,697 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2021-05-02 18:46:31,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.9074074074074074) internal successors, (157), 53 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:31,697 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2021-05-02 18:46:31,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-02 18:46:31,698 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:46:31,698 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 37, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:46:31,898 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:46:31,898 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:46:31,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:46:31,899 INFO L82 PathProgramCache]: Analyzing trace with hash -1865865640, now seen corresponding path program 22 times [2021-05-02 18:46:31,899 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:46:31,899 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729969424] [2021-05-02 18:46:31,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:46:31,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:32,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:46:32,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:32,731 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 866 proven. 2072 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:46:32,731 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:46:32,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729969424] [2021-05-02 18:46:32,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1729969424] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:32,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [761899454] [2021-05-02 18:46:32,731 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:46:32,783 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:46:32,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:46:32,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 18:46:32,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:46:33,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:46:33,153 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 458 proven. 2542 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:46:33,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [761899454] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:33,153 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:46:33,153 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 44] total 46 [2021-05-02 18:46:33,153 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390399310] [2021-05-02 18:46:33,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 18:46:33,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:46:33,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 18:46:33,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1943, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:46:33,154 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:37,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:46:37,001 INFO L93 Difference]: Finished difference Result 164 states and 166 transitions. [2021-05-02 18:46:37,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 18:46:37,002 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2021-05-02 18:46:37,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:46:37,003 INFO L225 Difference]: With dead ends: 164 [2021-05-02 18:46:37,003 INFO L226 Difference]: Without dead ends: 164 [2021-05-02 18:46:37,003 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 144 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 877 ImplicationChecksByTransitivity, 2493.3ms TimeCoverageRelationStatistics Valid=333, Invalid=7323, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 18:46:37,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-02 18:46:37,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2021-05-02 18:46:37,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.018987341772152) internal successors, (161), 158 states have internal predecessors, (161), 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 18:46:37,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 165 transitions. [2021-05-02 18:46:37,005 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 165 transitions. Word has length 146 [2021-05-02 18:46:37,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:46:37,006 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 165 transitions. [2021-05-02 18:46:37,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:46:37,006 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 165 transitions. [2021-05-02 18:46:37,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-02 18:46:37,006 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:46:37,006 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 42, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:46:37,220 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 18:46:37,221 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:46:37,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:46:37,221 INFO L82 PathProgramCache]: Analyzing trace with hash 2034476902, now seen corresponding path program 23 times [2021-05-02 18:46:37,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:46:37,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215123616] [2021-05-02 18:46:37,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:46:37,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:38,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:46:38,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:46:38,244 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 981 proven. 2667 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:46:38,244 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:46:38,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215123616] [2021-05-02 18:46:38,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215123616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:46:38,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017350171] [2021-05-02 18:46:38,244 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:38,223 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 51 check-sat command(s) [2021-05-02 18:51:38,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:38,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 137 conjunts are in the unsatisfiable core [2021-05-02 18:51:38,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:39,389 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 981 proven. 2667 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:51:39,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017350171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:39,389 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:39,389 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 18:51:39,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400841814] [2021-05-02 18:51:39,390 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 18:51:39,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:39,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 18:51:39,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:51:39,390 INFO L87 Difference]: Start difference. First operand 163 states and 165 transitions. Second operand has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:43,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:43,137 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2021-05-02 18:51:43,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:51:43,137 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2021-05-02 18:51:43,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:43,138 INFO L225 Difference]: With dead ends: 167 [2021-05-02 18:51:43,138 INFO L226 Difference]: Without dead ends: 167 [2021-05-02 18:51:43,138 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 121 SyntacticMatches, 43 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 3425.7ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 18:51:43,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-02 18:51:43,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2021-05-02 18:51:43,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.0186335403726707) internal successors, (164), 161 states have internal predecessors, (164), 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 18:51:43,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 168 transitions. [2021-05-02 18:51:43,140 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 168 transitions. Word has length 161 [2021-05-02 18:51:43,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:43,141 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 168 transitions. [2021-05-02 18:51:43,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:43,141 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 168 transitions. [2021-05-02 18:51:43,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-05-02 18:51:43,141 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:43,141 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 43, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:43,349 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:51:43,349 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:43,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:43,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1524129304, now seen corresponding path program 24 times [2021-05-02 18:51:43,350 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:43,350 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833305579] [2021-05-02 18:51:43,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:43,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:44,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:44,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:44,405 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1004 proven. 2795 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:51:44,405 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:44,405 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833305579] [2021-05-02 18:51:44,405 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833305579] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:44,405 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252772240] [2021-05-02 18:51:44,405 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:45,765 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 27 check-sat command(s) [2021-05-02 18:51:45,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:45,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:51:45,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:46,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:46,589 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1109 proven. 100 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2021-05-02 18:51:46,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252772240] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:46,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:46,589 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 13] total 58 [2021-05-02 18:51:46,589 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428769349] [2021-05-02 18:51:46,589 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 18:51:46,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:46,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 18:51:46,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=3140, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 18:51:46,590 INFO L87 Difference]: Start difference. First operand 166 states and 168 transitions. Second operand has 58 states, 58 states have (on average 2.9827586206896552) internal successors, (173), 57 states have internal predecessors, (173), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:57,906 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 43 [2021-05-02 18:51:58,505 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 45 [2021-05-02 18:52:04,713 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 43 [2021-05-02 18:52:05,283 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2021-05-02 18:52:05,951 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 43 [2021-05-02 18:52:05,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:05,952 INFO L93 Difference]: Finished difference Result 201 states and 212 transitions. [2021-05-02 18:52:05,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-02 18:52:05,952 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.9827586206896552) internal successors, (173), 57 states have internal predecessors, (173), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 164 [2021-05-02 18:52:05,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:05,953 INFO L225 Difference]: With dead ends: 201 [2021-05-02 18:52:05,953 INFO L226 Difference]: Without dead ends: 201 [2021-05-02 18:52:05,954 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2451 ImplicationChecksByTransitivity, 18308.0ms TimeCoverageRelationStatistics Valid=2373, Invalid=14397, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 18:52:05,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-05-02 18:52:05,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 174. [2021-05-02 18:52:05,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 169 states have (on average 1.017751479289941) internal successors, (172), 169 states have internal predecessors, (172), 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 18:52:05,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 176 transitions. [2021-05-02 18:52:05,956 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 176 transitions. Word has length 164 [2021-05-02 18:52:05,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:05,956 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 176 transitions. [2021-05-02 18:52:05,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.9827586206896552) internal successors, (173), 57 states have internal predecessors, (173), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:05,957 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 176 transitions. [2021-05-02 18:52:05,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-05-02 18:52:05,957 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:05,957 INFO L523 BasicCegarLoop]: trace histogram [54, 54, 45, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:06,160 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:52:06,161 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:06,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:06,161 INFO L82 PathProgramCache]: Analyzing trace with hash -300276571, now seen corresponding path program 25 times [2021-05-02 18:52:06,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:06,161 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112888802] [2021-05-02 18:52:06,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:06,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:07,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:07,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:07,393 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1187 proven. 3060 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:52:07,393 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:07,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112888802] [2021-05-02 18:52:07,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112888802] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:07,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145201993] [2021-05-02 18:52:07,393 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:07,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:07,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 18:52:07,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:07,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:07,789 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1187 proven. 3060 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:52:07,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145201993] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:07,789 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:07,789 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 18:52:07,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855424412] [2021-05-02 18:52:07,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:52:07,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:07,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:52:07,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:52:07,791 INFO L87 Difference]: Start difference. First operand 174 states and 176 transitions. Second operand has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:12,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:12,593 INFO L93 Difference]: Finished difference Result 178 states and 180 transitions. [2021-05-02 18:52:12,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:52:12,594 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 173 [2021-05-02 18:52:12,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:12,594 INFO L225 Difference]: With dead ends: 178 [2021-05-02 18:52:12,594 INFO L226 Difference]: Without dead ends: 178 [2021-05-02 18:52:12,595 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 175 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1039 ImplicationChecksByTransitivity, 3078.9ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 18:52:12,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-05-02 18:52:12,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2021-05-02 18:52:12,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 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 18:52:12,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 179 transitions. [2021-05-02 18:52:12,597 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 179 transitions. Word has length 173 [2021-05-02 18:52:12,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:12,597 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 179 transitions. [2021-05-02 18:52:12,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:12,597 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 179 transitions. [2021-05-02 18:52:12,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-02 18:52:12,598 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:12,598 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 46, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:12,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:12,816 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:12,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:12,817 INFO L82 PathProgramCache]: Analyzing trace with hash 258498647, now seen corresponding path program 26 times [2021-05-02 18:52:12,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:12,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30116191] [2021-05-02 18:52:12,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:12,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:14,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:14,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:14,305 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1213 proven. 3197 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:52:14,305 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:14,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30116191] [2021-05-02 18:52:14,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30116191] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:14,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056462989] [2021-05-02 18:52:14,305 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:14,363 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:14,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:14,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 95 conjunts are in the unsatisfiable core [2021-05-02 18:52:14,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:14,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:14,711 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1213 proven. 3197 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:52:14,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056462989] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:14,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:14,711 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-02 18:52:14,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540950202] [2021-05-02 18:52:14,712 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 18:52:14,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:14,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 18:52:14,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 18:52:14,713 INFO L87 Difference]: Start difference. First operand 177 states and 179 transitions. Second operand has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:19,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:19,736 INFO L93 Difference]: Finished difference Result 181 states and 183 transitions. [2021-05-02 18:52:19,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 18:52:19,737 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 176 [2021-05-02 18:52:19,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:19,740 INFO L225 Difference]: With dead ends: 181 [2021-05-02 18:52:19,740 INFO L226 Difference]: Without dead ends: 181 [2021-05-02 18:52:19,740 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 3358.0ms TimeCoverageRelationStatistics Valid=381, Invalid=9125, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 18:52:19,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-05-02 18:52:19,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2021-05-02 18:52:19,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.0171428571428571) internal successors, (178), 175 states have internal predecessors, (178), 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 18:52:19,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 182 transitions. [2021-05-02 18:52:19,742 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 182 transitions. Word has length 176 [2021-05-02 18:52:19,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:19,743 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 182 transitions. [2021-05-02 18:52:19,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:19,743 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 182 transitions. [2021-05-02 18:52:19,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-02 18:52:19,743 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:19,743 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 47, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:19,956 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 18:52:19,957 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:19,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:19,957 INFO L82 PathProgramCache]: Analyzing trace with hash -562221211, now seen corresponding path program 27 times [2021-05-02 18:52:19,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:19,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199381248] [2021-05-02 18:52:19,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:19,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:21,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:21,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:21,292 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1239 proven. 3337 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:52:21,292 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:21,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199381248] [2021-05-02 18:52:21,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1199381248] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:21,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538702070] [2021-05-02 18:52:21,292 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:21,565 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-02 18:52:21,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:21,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 18:52:21,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:23,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:23,236 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1353 proven. 126 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2021-05-02 18:52:23,237 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538702070] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:23,237 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:23,237 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 15] total 64 [2021-05-02 18:52:23,237 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149206497] [2021-05-02 18:52:23,237 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 18:52:23,237 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:23,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 18:52:23,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=3847, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 18:52:23,238 INFO L87 Difference]: Start difference. First operand 180 states and 182 transitions. Second operand has 64 states, 64 states have (on average 2.9375) internal successors, (188), 63 states have internal predecessors, (188), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:39,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:39,090 INFO L93 Difference]: Finished difference Result 198 states and 202 transitions. [2021-05-02 18:52:39,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-02 18:52:39,090 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.9375) internal successors, (188), 63 states have internal predecessors, (188), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2021-05-02 18:52:39,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:39,091 INFO L225 Difference]: With dead ends: 198 [2021-05-02 18:52:39,091 INFO L226 Difference]: Without dead ends: 198 [2021-05-02 18:52:39,092 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 169 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2174 ImplicationChecksByTransitivity, 13163.6ms TimeCoverageRelationStatistics Valid=1230, Invalid=15540, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 18:52:39,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-05-02 18:52:39,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 190. [2021-05-02 18:52:39,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.0162162162162163) internal successors, (188), 185 states have internal predecessors, (188), 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 18:52:39,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 192 transitions. [2021-05-02 18:52:39,094 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 192 transitions. Word has length 179 [2021-05-02 18:52:39,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:39,094 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 192 transitions. [2021-05-02 18:52:39,095 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 2.9375) internal successors, (188), 63 states have internal predecessors, (188), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:39,095 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 192 transitions. [2021-05-02 18:52:39,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-02 18:52:39,095 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:39,095 INFO L523 BasicCegarLoop]: trace histogram [59, 59, 49, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:39,306 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:39,306 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:39,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:39,306 INFO L82 PathProgramCache]: Analyzing trace with hash -865753416, now seen corresponding path program 28 times [2021-05-02 18:52:39,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:39,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777503346] [2021-05-02 18:52:39,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:39,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:40,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:40,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:40,781 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1440 proven. 3626 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:52:40,781 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:40,781 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777503346] [2021-05-02 18:52:40,781 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1777503346] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:40,781 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1009419155] [2021-05-02 18:52:40,781 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:40,894 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:52:40,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:40,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 18:52:40,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:41,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:41,275 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1440 proven. 3626 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:52:41,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1009419155] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:41,275 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:41,275 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-02 18:52:41,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441456091] [2021-05-02 18:52:41,276 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 18:52:41,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:41,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 18:52:41,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:52:41,276 INFO L87 Difference]: Start difference. First operand 190 states and 192 transitions. Second operand has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:47,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:47,027 INFO L93 Difference]: Finished difference Result 194 states and 196 transitions. [2021-05-02 18:52:47,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 18:52:47,027 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 188 [2021-05-02 18:52:47,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:47,028 INFO L225 Difference]: With dead ends: 194 [2021-05-02 18:52:47,028 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 18:52:47,029 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 190 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 3654.2ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 18:52:47,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 18:52:47,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2021-05-02 18:52:47,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 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 18:52:47,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-05-02 18:52:47,031 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 188 [2021-05-02 18:52:47,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:47,031 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-05-02 18:52:47,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:47,031 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-05-02 18:52:47,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-02 18:52:47,032 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:47,032 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 50, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:47,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 18:52:47,245 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:47,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:47,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1696182074, now seen corresponding path program 29 times [2021-05-02 18:52:47,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:47,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437115622] [2021-05-02 18:52:47,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:47,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:48,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:48,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:48,797 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1469 proven. 3775 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:52:48,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:48,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437115622] [2021-05-02 18:52:48,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437115622] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:48,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853396171] [2021-05-02 18:52:48,797 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true