/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/Mono1_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:23:41,346 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:23:41,348 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:23:41,388 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 18:23:41,408 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:23:41,410 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:23:41,411 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:23:41,413 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:23:41,416 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:23:41,417 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:23:41,419 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:23:41,425 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:23:41,427 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:23:41,428 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:23:41,429 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:23:41,431 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:23:41,437 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:23:41,452 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:23:41,454 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:23:41,454 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:23:41,455 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:23:41,472 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:23:41,472 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:23:41,475 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:23:41,475 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:23:41,475 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:23:41,475 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:23:41,476 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:23:41,476 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:23:41,476 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:23:41,476 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:23:41,477 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:23:41,477 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:23:41,477 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:23:41,478 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:23:41,478 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:23:41,478 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:23:41,478 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:23:41,478 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:23:41,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:23:41,478 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:23:41,479 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:23:41,479 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:23:41,479 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:23:41,798 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:23:41,820 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:23:41,823 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:23:41,824 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:23:41,824 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:23:41,825 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-1.c [2021-05-02 18:23:41,879 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b987e3b3/71778d3b5c074af9b89d74d3414059a5/FLAGae00badbc [2021-05-02 18:23:42,296 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:23:42,297 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-1.c [2021-05-02 18:23:42,302 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b987e3b3/71778d3b5c074af9b89d74d3414059a5/FLAGae00badbc [2021-05-02 18:23:42,321 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b987e3b3/71778d3b5c074af9b89d74d3414059a5 [2021-05-02 18:23:42,323 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:23:42,325 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:23:42,328 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:23:42,328 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:23:42,331 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:23:42,332 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:23:42" (1/1) ... [2021-05-02 18:23:42,332 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@727919bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:42, skipping insertion in model container [2021-05-02 18:23:42,332 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:23:42" (1/1) ... [2021-05-02 18:23:42,338 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:23:42,349 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:23:42,459 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/Mono1_1-1.c[313,326] [2021-05-02 18:23:42,466 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:23:42,472 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:23:42,482 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/Mono1_1-1.c[313,326] [2021-05-02 18:23:42,484 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:23:42,495 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:23:42,495 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:42 WrapperNode [2021-05-02 18:23:42,496 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:23:42,497 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:23:42,497 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:23:42,497 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:23:42,505 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:42" (1/1) ... [2021-05-02 18:23:42,505 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:42" (1/1) ... [2021-05-02 18:23:42,510 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:42" (1/1) ... [2021-05-02 18:23:42,510 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:42" (1/1) ... [2021-05-02 18:23:42,513 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:42" (1/1) ... [2021-05-02 18:23:42,516 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:42" (1/1) ... [2021-05-02 18:23:42,517 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:42" (1/1) ... [2021-05-02 18:23:42,518 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:23:42,519 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:23:42,519 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:23:42,519 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:23:42,544 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:42" (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 18:23:42,620 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:23:42,620 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:23:42,620 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:23:42,620 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:23:42,620 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:23:42,621 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:23:42,621 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:23:42,621 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:23:42,621 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:23:42,622 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:23:42,622 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:23:42,622 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:23:42,622 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:23:42,623 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:23:42,623 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:23:42,623 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:23:42,623 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:23:42,875 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:23:42,875 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:23:42,876 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:42 BoogieIcfgContainer [2021-05-02 18:23:42,876 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:23:42,877 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:23:42,877 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:23:42,878 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:23:42,880 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:42" (1/1) ... [2021-05-02 18:23:42,910 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:23:42 BasicIcfg [2021-05-02 18:23:42,910 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:23:42,912 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:23:42,912 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:23:42,914 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:23:42,914 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:23:42" (1/4) ... [2021-05-02 18:23:42,915 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3163e2c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:23:42, skipping insertion in model container [2021-05-02 18:23:42,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:42" (2/4) ... [2021-05-02 18:23:42,915 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3163e2c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:23:42, skipping insertion in model container [2021-05-02 18:23:42,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:42" (3/4) ... [2021-05-02 18:23:42,916 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3163e2c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:23:42, skipping insertion in model container [2021-05-02 18:23:42,916 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:23:42" (4/4) ... [2021-05-02 18:23:42,917 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono1_1-1.cJordan [2021-05-02 18:23:42,921 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:23:42,925 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:23:42,938 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:23:42,961 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:23:42,961 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:23:42,961 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:23:42,961 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:23:42,962 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:23:42,962 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:23:42,962 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:23:42,962 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:23:42,976 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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 18:23:42,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:23:42,982 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:42,983 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:42,983 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:42,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:42,987 INFO L82 PathProgramCache]: Analyzing trace with hash -756157467, now seen corresponding path program 1 times [2021-05-02 18:23:42,994 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:42,994 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821217491] [2021-05-02 18:23:42,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:43,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:43,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:43,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:43,220 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 18:23:43,221 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:43,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821217491] [2021-05-02 18:23:43,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [821217491] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:43,221 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:23:43,222 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:23:43,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833870721] [2021-05-02 18:23:43,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:23:43,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:43,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:23:43,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:23:43,238 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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 18:23:43,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:43,267 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-05-02 18:23:43,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:23:43,269 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 18:23:43,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:43,275 INFO L225 Difference]: With dead ends: 19 [2021-05-02 18:23:43,275 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 18:23:43,276 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 50.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:23:43,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 18:23:43,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 18:23:43,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:43,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-02 18:23:43,300 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-02 18:23:43,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:43,300 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-02 18:23:43,301 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 18:23:43,301 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-02 18:23:43,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:23:43,301 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:43,301 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:43,302 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:23:43,302 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:43,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:43,303 INFO L82 PathProgramCache]: Analyzing trace with hash -755233946, now seen corresponding path program 1 times [2021-05-02 18:23:43,303 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:43,303 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958718923] [2021-05-02 18:23:43,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:43,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:43,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:43,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:43,400 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 18:23:43,401 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:43,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958718923] [2021-05-02 18:23:43,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958718923] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:43,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:23:43,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:23:43,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470075627] [2021-05-02 18:23:43,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:23:43,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:43,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:23:43,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:23:43,404 INFO L87 Difference]: Start difference. First operand 13 states and 14 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 18:23:43,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:43,477 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-05-02 18:23:43,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:23:43,478 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 18:23:43,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:43,479 INFO L225 Difference]: With dead ends: 15 [2021-05-02 18:23:43,479 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 18:23:43,480 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:23:43,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 18:23:43,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 18:23:43,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:43,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 18:23:43,482 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-02 18:23:43,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:43,483 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 18:23:43,483 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 18:23:43,483 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 18:23:43,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 18:23:43,483 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:43,484 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:43,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:23:43,484 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:43,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:43,484 INFO L82 PathProgramCache]: Analyzing trace with hash 980092676, now seen corresponding path program 1 times [2021-05-02 18:23:43,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:43,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005723339] [2021-05-02 18:23:43,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:43,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:43,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:43,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:43,567 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 18:23:43,567 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:43,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005723339] [2021-05-02 18:23:43,568 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1005723339] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:43,568 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [289502361] [2021-05-02 18:23:43,568 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 18:23:43,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:43,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 18:23:43,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:43,665 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 18:23:43,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [289502361] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:43,666 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:43,666 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 18:23:43,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587529715] [2021-05-02 18:23:43,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:23:43,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:43,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:23:43,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:23:43,668 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 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 18:23:43,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:43,744 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-05-02 18:23:43,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:23:43,745 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 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 13 [2021-05-02 18:23:43,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:43,745 INFO L225 Difference]: With dead ends: 17 [2021-05-02 18:23:43,746 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 18:23:43,746 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 81.3ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:43,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 18:23:43,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 18:23:43,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:43,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 18:23:43,749 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2021-05-02 18:23:43,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:43,749 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 18:23:43,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 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 18:23:43,749 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 18:23:43,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 18:23:43,750 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:43,750 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:43,971 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 18:23:43,972 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:43,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:43,973 INFO L82 PathProgramCache]: Analyzing trace with hash -2113301726, now seen corresponding path program 2 times [2021-05-02 18:23:43,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:43,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868916909] [2021-05-02 18:23:43,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:43,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:44,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:44,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:44,141 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:44,142 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:44,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868916909] [2021-05-02 18:23:44,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [868916909] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:44,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349522866] [2021-05-02 18:23:44,142 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 18:23:44,214 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:44,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:44,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:23:44,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:44,271 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:44,271 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349522866] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:44,271 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:44,271 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 18:23:44,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790816571] [2021-05-02 18:23:44,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:23:44,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:44,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:23:44,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:23:44,273 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 18:23:44,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:44,399 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-05-02 18:23:44,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:23:44,400 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 15 [2021-05-02 18:23:44,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:44,401 INFO L225 Difference]: With dead ends: 19 [2021-05-02 18:23:44,401 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 18:23:44,401 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 143.6ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:23:44,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 18:23:44,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 18:23:44,403 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 18:23:44,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 18:23:44,404 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-05-02 18:23:44,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:44,404 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 18:23:44,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 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 18:23:44,405 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 18:23:44,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:23:44,405 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:44,405 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:44,627 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:44,627 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:44,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:44,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1547014080, now seen corresponding path program 3 times [2021-05-02 18:23:44,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:44,628 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877519923] [2021-05-02 18:23:44,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:44,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:44,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:44,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:44,728 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:44,728 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:44,728 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877519923] [2021-05-02 18:23:44,728 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [877519923] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:44,728 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283079135] [2021-05-02 18:23:44,728 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 18:23:44,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:23:44,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:44,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:23:44,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:44,833 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 18:23:44,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283079135] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:44,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:23:44,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2021-05-02 18:23:44,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337020614] [2021-05-02 18:23:44,835 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:23:44,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:44,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:23:44,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:44,836 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:44,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:44,846 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-05-02 18:23:44,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:23:44,846 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 18:23:44,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:44,847 INFO L225 Difference]: With dead ends: 21 [2021-05-02 18:23:44,847 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 18:23:44,847 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 68.2ms TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:44,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 18:23:44,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 18:23:44,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:44,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-05-02 18:23:44,850 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2021-05-02 18:23:44,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:44,850 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-05-02 18:23:44,851 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:44,851 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-05-02 18:23:44,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 18:23:44,851 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:44,851 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:45,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:45,069 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:45,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:45,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1560917373, now seen corresponding path program 1 times [2021-05-02 18:23:45,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:45,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940238554] [2021-05-02 18:23:45,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:45,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:45,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,168 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:45,168 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:45,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940238554] [2021-05-02 18:23:45,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940238554] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:45,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669703093] [2021-05-02 18:23:45,169 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 18:23:45,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:23:45,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:45,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:45,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:45,328 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:45,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669703093] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:45,329 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:45,329 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 18:23:45,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055076110] [2021-05-02 18:23:45,330 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:23:45,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:45,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:23:45,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:45,331 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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 18:23:45,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:45,516 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-05-02 18:23:45,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:23:45,517 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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 19 [2021-05-02 18:23:45,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:45,519 INFO L225 Difference]: With dead ends: 22 [2021-05-02 18:23:45,519 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 18:23:45,519 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 185.0ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:23:45,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 18:23:45,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 18:23:45,525 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 18:23:45,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 18:23:45,526 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2021-05-02 18:23:45,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:45,526 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 18:23:45,527 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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 18:23:45,527 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 18:23:45,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 18:23:45,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:45,527 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:45,740 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:45,741 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:45,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:45,742 INFO L82 PathProgramCache]: Analyzing trace with hash 294269723, now seen corresponding path program 2 times [2021-05-02 18:23:45,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:45,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349516074] [2021-05-02 18:23:45,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:45,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:45,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:45,864 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:45,865 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:45,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349516074] [2021-05-02 18:23:45,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349516074] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:45,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895367807] [2021-05-02 18:23:45,865 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 18:23:45,909 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:45,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:45,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 18:23:45,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:45,991 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:45,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895367807] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:45,991 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:45,991 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-05-02 18:23:45,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870249697] [2021-05-02 18:23:45,992 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 18:23:45,992 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:45,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 18:23:45,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:23:45,993 INFO L87 Difference]: Start difference. First operand 22 states and 23 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 18:23:46,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:46,200 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-02 18:23:46,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:23:46,200 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 21 [2021-05-02 18:23:46,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:46,201 INFO L225 Difference]: With dead ends: 24 [2021-05-02 18:23:46,201 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 18:23:46,201 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 215.4ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:23:46,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 18:23:46,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 18:23:46,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:46,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 18:23:46,204 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2021-05-02 18:23:46,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:46,204 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 18:23:46,204 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 18:23:46,205 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 18:23:46,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:23:46,205 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:46,205 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:46,416 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 18:23:46,417 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:46,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:46,417 INFO L82 PathProgramCache]: Analyzing trace with hash -1478377159, now seen corresponding path program 3 times [2021-05-02 18:23:46,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:46,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964580799] [2021-05-02 18:23:46,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:46,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:46,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:46,537 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:46,537 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:46,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964580799] [2021-05-02 18:23:46,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964580799] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:46,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307234684] [2021-05-02 18:23:46,538 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 18:23:46,615 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 18:23:46,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:46,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 18:23:46,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:46,680 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 18:23:46,680 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [307234684] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:46,680 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:46,680 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4] total 11 [2021-05-02 18:23:46,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599169095] [2021-05-02 18:23:46,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:23:46,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:46,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:23:46,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:23:46,682 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 18:23:47,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:47,093 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 18:23:47,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:23:47,093 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 23 [2021-05-02 18:23:47,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:47,094 INFO L225 Difference]: With dead ends: 31 [2021-05-02 18:23:47,094 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 18:23:47,094 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 413.0ms TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:23:47,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 18:23:47,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-02 18:23:47,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:47,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-02 18:23:47,097 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-05-02 18:23:47,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:47,098 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-02 18:23:47,098 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 18:23:47,098 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-02 18:23:47,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 18:23:47,098 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:47,098 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:47,299 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:47,299 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:47,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:47,300 INFO L82 PathProgramCache]: Analyzing trace with hash -738804780, now seen corresponding path program 4 times [2021-05-02 18:23:47,300 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:47,300 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508648624] [2021-05-02 18:23:47,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:47,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:47,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:47,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:47,422 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:47,422 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:47,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508648624] [2021-05-02 18:23:47,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508648624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:47,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709343576] [2021-05-02 18:23:47,422 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 18:23:47,477 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:23:47,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:47,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 18:23:47,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:47,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:47,568 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:47,568 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709343576] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:47,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:47,568 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 18:23:47,568 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290711924] [2021-05-02 18:23:47,569 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:23:47,569 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:47,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:23:47,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:23:47,570 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 18:23:47,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:47,833 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-05-02 18:23:47,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:23:47,833 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 27 [2021-05-02 18:23:47,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:47,833 INFO L225 Difference]: With dead ends: 30 [2021-05-02 18:23:47,834 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 18:23:47,834 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 262.8ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:23:47,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 18:23:47,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 18:23:47,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:47,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-02 18:23:47,837 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2021-05-02 18:23:47,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:47,837 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-02 18:23:47,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 18:23:47,837 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-02 18:23:47,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:23:47,838 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:47,838 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:48,040 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:48,041 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:48,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:48,041 INFO L82 PathProgramCache]: Analyzing trace with hash -186205326, now seen corresponding path program 5 times [2021-05-02 18:23:48,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:48,042 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661294584] [2021-05-02 18:23:48,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:48,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:48,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:48,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:48,188 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:48,188 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:48,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661294584] [2021-05-02 18:23:48,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661294584] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:48,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116322176] [2021-05-02 18:23:48,189 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 18:23:48,257 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 18:23:48,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:48,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:23:48,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:48,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:48,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:48,382 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:48,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [116322176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:48,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:48,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 18:23:48,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340757020] [2021-05-02 18:23:48,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:23:48,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:48,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:23:48,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:23:48,384 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 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 18:23:48,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:48,700 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-05-02 18:23:48,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:23:48,701 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 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 18:23:48,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:48,701 INFO L225 Difference]: With dead ends: 32 [2021-05-02 18:23:48,701 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 18:23:48,702 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 338.3ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:23:48,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 18:23:48,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 18:23:48,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 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 18:23:48,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-05-02 18:23:48,705 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2021-05-02 18:23:48,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:48,705 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-05-02 18:23:48,705 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 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 18:23:48,705 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-05-02 18:23:48,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 18:23:48,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:48,706 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:48,920 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:23:48,921 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:48,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:48,921 INFO L82 PathProgramCache]: Analyzing trace with hash -1714074736, now seen corresponding path program 6 times [2021-05-02 18:23:48,922 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:48,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200253612] [2021-05-02 18:23:48,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:48,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:49,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:49,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:49,133 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:49,133 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:49,133 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200253612] [2021-05-02 18:23:49,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200253612] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:49,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844454695] [2021-05-02 18:23:49,134 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 18:23:49,239 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-05-02 18:23:49,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:49,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:23:49,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:49,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:49,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:49,354 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:49,355 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844454695] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:49,355 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:49,355 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2021-05-02 18:23:49,355 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443828975] [2021-05-02 18:23:49,355 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:23:49,356 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:49,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:23:49,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:23:49,356 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 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 18:23:49,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:49,734 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-05-02 18:23:49,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:23:49,734 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 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 31 [2021-05-02 18:23:49,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:49,734 INFO L225 Difference]: With dead ends: 34 [2021-05-02 18:23:49,735 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 18:23:49,735 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 404.6ms TimeCoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:23:49,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 18:23:49,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 18:23:49,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:49,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-05-02 18:23:49,738 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2021-05-02 18:23:49,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:49,738 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-05-02 18:23:49,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 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 18:23:49,738 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-05-02 18:23:49,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 18:23:49,739 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:49,739 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:49,940 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:49,941 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:49,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:49,941 INFO L82 PathProgramCache]: Analyzing trace with hash -1117762514, now seen corresponding path program 7 times [2021-05-02 18:23:49,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:49,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770708977] [2021-05-02 18:23:49,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:49,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:50,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,158 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:50,158 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:50,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770708977] [2021-05-02 18:23:50,158 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770708977] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:50,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149020841] [2021-05-02 18:23:50,158 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 18:23:50,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:23:50,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:50,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:50,313 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:50,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149020841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:50,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:50,314 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 18:23:50,314 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37008797] [2021-05-02 18:23:50,314 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:23:50,314 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:50,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:23:50,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:23:50,315 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 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 18:23:50,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:50,748 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-05-02 18:23:50,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:23:50,748 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 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 33 [2021-05-02 18:23:50,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:50,749 INFO L225 Difference]: With dead ends: 36 [2021-05-02 18:23:50,749 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 18:23:50,750 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 463.7ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:23:50,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 18:23:50,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 18:23:50,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:50,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-05-02 18:23:50,752 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2021-05-02 18:23:50,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:50,752 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-05-02 18:23:50,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 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 18:23:50,753 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-05-02 18:23:50,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 18:23:50,753 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:50,753 INFO L523 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:50,956 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:50,957 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:50,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:50,957 INFO L82 PathProgramCache]: Analyzing trace with hash 707632460, now seen corresponding path program 8 times [2021-05-02 18:23:50,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:50,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433035085] [2021-05-02 18:23:50,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:50,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:51,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:51,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:51,141 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 33 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:51,141 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:51,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433035085] [2021-05-02 18:23:51,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [433035085] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:51,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1111574712] [2021-05-02 18:23:51,142 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 18:23:51,197 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:51,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:51,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 18:23:51,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:51,361 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:51,361 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1111574712] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:51,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:51,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 17 [2021-05-02 18:23:51,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139893557] [2021-05-02 18:23:51,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:23:51,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:51,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:23:51,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:23:51,363 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 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 18:23:51,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:51,879 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2021-05-02 18:23:51,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 18:23:51,879 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 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 18:23:51,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:51,880 INFO L225 Difference]: With dead ends: 38 [2021-05-02 18:23:51,880 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 18:23:51,881 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 485.5ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:23:51,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 18:23:51,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 18:23:51,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:51,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-05-02 18:23:51,883 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2021-05-02 18:23:51,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:51,883 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-05-02 18:23:51,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 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 18:23:51,884 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-05-02 18:23:51,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 18:23:51,884 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:51,884 INFO L523 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:52,104 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 18:23:52,105 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:52,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:52,105 INFO L82 PathProgramCache]: Analyzing trace with hash -1729421590, now seen corresponding path program 9 times [2021-05-02 18:23:52,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:52,106 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819584557] [2021-05-02 18:23:52,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:52,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:52,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:52,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:52,319 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:23:52,319 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:52,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819584557] [2021-05-02 18:23:52,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1819584557] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:52,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73284073] [2021-05-02 18:23:52,320 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 18:23:52,372 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 18:23:52,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:52,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:23:52,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:52,586 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 4 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-05-02 18:23:52,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73284073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:52,587 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:52,587 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5] total 18 [2021-05-02 18:23:52,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843134929] [2021-05-02 18:23:52,587 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:23:52,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:52,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:23:52,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:23:52,588 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 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 18:23:53,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:53,275 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2021-05-02 18:23:53,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 18:23:53,275 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 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 37 [2021-05-02 18:23:53,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:53,276 INFO L225 Difference]: With dead ends: 43 [2021-05-02 18:23:53,276 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 18:23:53,277 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 699.7ms TimeCoverageRelationStatistics Valid=157, Invalid=899, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:23:53,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 18:23:53,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 18:23:53,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:53,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-02 18:23:53,280 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 37 [2021-05-02 18:23:53,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:53,280 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-02 18:23:53,281 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 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 18:23:53,281 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-02 18:23:53,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 18:23:53,281 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:53,281 INFO L523 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:53,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:23:53,485 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:53,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:53,485 INFO L82 PathProgramCache]: Analyzing trace with hash 761242821, now seen corresponding path program 10 times [2021-05-02 18:23:53,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:53,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227175986] [2021-05-02 18:23:53,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:53,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:53,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:53,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:53,713 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:23:53,714 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:53,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227175986] [2021-05-02 18:23:53,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227175986] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:53,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870810659] [2021-05-02 18:23:53,714 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 18:23:53,749 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:23:53,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:53,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 18:23:53,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:53,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:53,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:53,853 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:23:53,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870810659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:53,854 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:53,854 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 18:23:53,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924994306] [2021-05-02 18:23:53,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:23:53,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:53,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:23:53,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:23:53,855 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 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 18:23:54,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:54,420 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2021-05-02 18:23:54,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:23:54,420 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 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 41 [2021-05-02 18:23:54,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:54,421 INFO L225 Difference]: With dead ends: 45 [2021-05-02 18:23:54,421 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 18:23:54,421 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 524.0ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:23:54,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 18:23:54,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 18:23:54,423 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 18:23:54,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-02 18:23:54,424 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2021-05-02 18:23:54,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:54,424 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-02 18:23:54,424 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 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 18:23:54,425 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-02 18:23:54,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 18:23:54,425 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:54,425 INFO L523 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:54,640 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:23:54,641 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:54,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:54,641 INFO L82 PathProgramCache]: Analyzing trace with hash -2075068445, now seen corresponding path program 11 times [2021-05-02 18:23:54,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:54,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530687619] [2021-05-02 18:23:54,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:54,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:54,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:54,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:54,860 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:23:54,860 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:54,860 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530687619] [2021-05-02 18:23:54,860 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530687619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:54,860 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450470891] [2021-05-02 18:23:54,860 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 18:23:55,414 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 18:23:55,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:55,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 18:23:55,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:55,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,678 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:23:55,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450470891] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:55,678 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:55,678 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 18:23:55,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463239827] [2021-05-02 18:23:55,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:23:55,679 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:55,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:23:55,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:23:55,680 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 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 18:23:56,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:56,269 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2021-05-02 18:23:56,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 18:23:56,270 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 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 43 [2021-05-02 18:23:56,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:56,270 INFO L225 Difference]: With dead ends: 47 [2021-05-02 18:23:56,270 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 18:23:56,271 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 32 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 681.0ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:23:56,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 18:23:56,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-02 18:23:56,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:56,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2021-05-02 18:23:56,274 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2021-05-02 18:23:56,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:56,274 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2021-05-02 18:23:56,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 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 18:23:56,274 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2021-05-02 18:23:56,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 18:23:56,274 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:56,275 INFO L523 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:56,478 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:56,478 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:56,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:56,479 INFO L82 PathProgramCache]: Analyzing trace with hash -465962111, now seen corresponding path program 12 times [2021-05-02 18:23:56,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:56,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126830979] [2021-05-02 18:23:56,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:56,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:56,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:56,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:56,750 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 75 proven. 210 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:23:56,750 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:56,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126830979] [2021-05-02 18:23:56,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126830979] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:56,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552530143] [2021-05-02 18:23:56,751 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 18:23:56,876 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 18:23:56,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:56,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:23:56,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:56,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:56,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:56,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:56,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:56,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:56,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:57,102 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 98 proven. 9 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-05-02 18:23:57,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552530143] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:57,102 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:57,103 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6] total 22 [2021-05-02 18:23:57,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599551565] [2021-05-02 18:23:57,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:23:57,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:57,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:23:57,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:23:57,104 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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 18:23:58,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:58,175 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2021-05-02 18:23:58,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 18:23:58,176 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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 45 [2021-05-02 18:23:58,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:58,176 INFO L225 Difference]: With dead ends: 53 [2021-05-02 18:23:58,176 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 18:23:58,177 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 1067.7ms TimeCoverageRelationStatistics Valid=260, Invalid=1462, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:23:58,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 18:23:58,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2021-05-02 18:23:58,180 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 18:23:58,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 18:23:58,180 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 45 [2021-05-02 18:23:58,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:58,180 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 18:23:58,181 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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 18:23:58,181 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 18:23:58,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 18:23:58,181 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:58,181 INFO L523 BasicCegarLoop]: trace histogram [19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:58,385 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 18:23:58,385 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:58,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:58,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1812216220, now seen corresponding path program 13 times [2021-05-02 18:23:58,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:58,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290444976] [2021-05-02 18:23:58,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:58,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:58,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:58,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:58,670 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:23:58,670 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:58,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290444976] [2021-05-02 18:23:58,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290444976] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:58,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736957698] [2021-05-02 18:23:58,670 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 18:23:58,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:58,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 18:23:58,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:58,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:58,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:58,853 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:23:58,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736957698] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:58,854 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:58,854 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 18:23:58,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965604690] [2021-05-02 18:23:58,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:23:58,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:58,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:23:58,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:23:58,855 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 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 18:23:59,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:59,714 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2021-05-02 18:23:59,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:23:59,714 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 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 49 [2021-05-02 18:23:59,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:59,715 INFO L225 Difference]: With dead ends: 53 [2021-05-02 18:23:59,715 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 18:23:59,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 751.0ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:23:59,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 18:23:59,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 18:23:59,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:59,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-05-02 18:23:59,722 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2021-05-02 18:23:59,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:59,722 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-05-02 18:23:59,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 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 18:23:59,722 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-05-02 18:23:59,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 18:23:59,725 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:59,725 INFO L523 BasicCegarLoop]: trace histogram [20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:59,940 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:23:59,941 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:59,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:59,942 INFO L82 PathProgramCache]: Analyzing trace with hash -772305222, now seen corresponding path program 14 times [2021-05-02 18:23:59,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:59,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751809242] [2021-05-02 18:23:59,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:59,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:00,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:00,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:00,232 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 119 proven. 272 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:24:00,232 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:00,232 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751809242] [2021-05-02 18:24:00,232 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1751809242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:00,232 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352370866] [2021-05-02 18:24:00,232 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 18:24:00,291 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:24:00,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:00,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 18:24:00,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:00,485 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:00,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352370866] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:00,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:00,485 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 25 [2021-05-02 18:24:00,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729066963] [2021-05-02 18:24:00,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:24:00,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:00,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:24:00,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=536, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:24:00,486 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 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 18:24:01,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:01,399 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-05-02 18:24:01,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 18:24:01,400 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 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 51 [2021-05-02 18:24:01,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:01,400 INFO L225 Difference]: With dead ends: 55 [2021-05-02 18:24:01,400 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 18:24:01,401 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 843.0ms TimeCoverageRelationStatistics Valid=149, Invalid=1573, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:24:01,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 18:24:01,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 18:24:01,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:01,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-02 18:24:01,403 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2021-05-02 18:24:01,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:01,404 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-02 18:24:01,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 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 18:24:01,404 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-02 18:24:01,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 18:24:01,404 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:01,404 INFO L523 BasicCegarLoop]: trace histogram [21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:01,616 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:01,617 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:01,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:01,617 INFO L82 PathProgramCache]: Analyzing trace with hash -2006313896, now seen corresponding path program 15 times [2021-05-02 18:24:01,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:01,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309749909] [2021-05-02 18:24:01,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:01,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:01,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:01,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:01,920 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 126 proven. 306 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:24:01,920 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:01,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309749909] [2021-05-02 18:24:01,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309749909] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:01,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337589260] [2021-05-02 18:24:01,920 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 18:24:01,980 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 18:24:01,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:01,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:24:01,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:02,204 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 153 proven. 16 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-05-02 18:24:02,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337589260] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:02,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:02,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7] total 26 [2021-05-02 18:24:02,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558319837] [2021-05-02 18:24:02,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:24:02,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:02,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:24:02,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=532, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:24:02,206 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 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 18:24:03,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:03,687 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2021-05-02 18:24:03,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 18:24:03,687 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 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 53 [2021-05-02 18:24:03,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:03,688 INFO L225 Difference]: With dead ends: 61 [2021-05-02 18:24:03,688 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 18:24:03,688 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 1502.5ms TimeCoverageRelationStatistics Valid=341, Invalid=2109, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:24:03,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 18:24:03,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2021-05-02 18:24:03,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:03,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2021-05-02 18:24:03,691 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 53 [2021-05-02 18:24:03,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:03,691 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2021-05-02 18:24:03,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 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 18:24:03,691 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2021-05-02 18:24:03,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 18:24:03,692 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:03,692 INFO L523 BasicCegarLoop]: trace histogram [23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:03,904 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:03,905 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:03,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:03,905 INFO L82 PathProgramCache]: Analyzing trace with hash -695600461, now seen corresponding path program 16 times [2021-05-02 18:24:03,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:03,905 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692286223] [2021-05-02 18:24:03,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:03,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:04,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:04,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:04,218 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:24:04,218 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:04,218 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692286223] [2021-05-02 18:24:04,218 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [692286223] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:04,218 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054123094] [2021-05-02 18:24:04,219 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 18:24:04,278 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:24:04,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:04,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 18:24:04,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:04,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:04,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:04,422 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:24:04,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054123094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:04,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:04,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 18:24:04,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233747821] [2021-05-02 18:24:04,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 18:24:04,423 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:04,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 18:24:04,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:24:04,423 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 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 18:24:05,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:05,320 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2021-05-02 18:24:05,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 18:24:05,320 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 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 57 [2021-05-02 18:24:05,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:05,321 INFO L225 Difference]: With dead ends: 61 [2021-05-02 18:24:05,321 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 18:24:05,321 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 834.2ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:24:05,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 18:24:05,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-02 18:24:05,323 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 18:24:05,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 18:24:05,324 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2021-05-02 18:24:05,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:05,324 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 18:24:05,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 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 18:24:05,324 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 18:24:05,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 18:24:05,325 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:05,325 INFO L523 BasicCegarLoop]: trace histogram [24, 19, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:05,544 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:05,545 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:05,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:05,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1302507055, now seen corresponding path program 17 times [2021-05-02 18:24:05,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:05,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941278971] [2021-05-02 18:24:05,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:05,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:05,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:05,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:05,867 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:24:05,868 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:05,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941278971] [2021-05-02 18:24:05,868 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941278971] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:05,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359868537] [2021-05-02 18:24:05,868 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 18:24:07,213 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 18:24:07,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:07,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 18:24:07,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:07,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:07,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:07,495 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 69 proven. 506 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:24:07,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [359868537] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:07,495 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:07,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 25] total 27 [2021-05-02 18:24:07,496 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331853426] [2021-05-02 18:24:07,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 18:24:07,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:07,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 18:24:07,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=631, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:24:07,497 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 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 18:24:08,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:08,544 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2021-05-02 18:24:08,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 18:24:08,546 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 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 59 [2021-05-02 18:24:08,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:08,547 INFO L225 Difference]: With dead ends: 63 [2021-05-02 18:24:08,547 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 18:24:08,547 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 1006.1ms TimeCoverageRelationStatistics Valid=171, Invalid=1991, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:24:08,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 18:24:08,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-02 18:24:08,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:08,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-02 18:24:08,549 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2021-05-02 18:24:08,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:08,549 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-02 18:24:08,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 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 18:24:08,550 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-02 18:24:08,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 18:24:08,550 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:08,550 INFO L523 BasicCegarLoop]: trace histogram [25, 20, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:08,754 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 18:24:08,755 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:08,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:08,755 INFO L82 PathProgramCache]: Analyzing trace with hash -424191633, now seen corresponding path program 18 times [2021-05-02 18:24:08,755 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:08,755 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141667933] [2021-05-02 18:24:08,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:08,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:09,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:09,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:09,085 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 189 proven. 420 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:24:09,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:09,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141667933] [2021-05-02 18:24:09,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1141667933] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:09,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879697486] [2021-05-02 18:24:09,085 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 18:24:09,329 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2021-05-02 18:24:09,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:09,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 72 conjunts are in the unsatisfiable core [2021-05-02 18:24:09,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:09,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:09,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:09,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:09,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:09,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:09,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:09,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:10,608 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 192 proven. 401 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 18:24:10,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879697486] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:10,608 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:10,608 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 21] total 38 [2021-05-02 18:24:10,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812694103] [2021-05-02 18:24:10,609 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 18:24:10,609 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:10,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 18:24:10,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=1142, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:24:10,610 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 38 states, 38 states have (on average 2.210526315789474) internal successors, (84), 37 states have internal predecessors, (84), 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 18:24:12,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:12,958 INFO L93 Difference]: Finished difference Result 83 states and 93 transitions. [2021-05-02 18:24:12,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 18:24:12,958 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.210526315789474) internal successors, (84), 37 states have internal predecessors, (84), 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 61 [2021-05-02 18:24:12,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:12,960 INFO L225 Difference]: With dead ends: 83 [2021-05-02 18:24:12,960 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 18:24:12,961 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 48 SyntacticMatches, 8 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 899 ImplicationChecksByTransitivity, 2903.6ms TimeCoverageRelationStatistics Valid=795, Invalid=4461, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 18:24:12,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 18:24:12,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 67. [2021-05-02 18:24:12,964 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 18:24:12,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-02 18:24:12,964 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 61 [2021-05-02 18:24:12,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:12,964 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-02 18:24:12,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.210526315789474) internal successors, (84), 37 states have internal predecessors, (84), 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 18:24:12,965 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-02 18:24:12,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 18:24:12,965 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:12,965 INFO L523 BasicCegarLoop]: trace histogram [27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:13,170 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 18:24:13,170 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:13,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:13,170 INFO L82 PathProgramCache]: Analyzing trace with hash 821090314, now seen corresponding path program 19 times [2021-05-02 18:24:13,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:13,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359932394] [2021-05-02 18:24:13,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:13,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:13,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:13,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:13,580 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:24:13,580 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:13,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359932394] [2021-05-02 18:24:13,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359932394] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:13,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494813993] [2021-05-02 18:24:13,580 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 18:24:13,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:13,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 18:24:13,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:13,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:13,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:13,800 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:24:13,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494813993] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:13,800 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:13,800 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 18:24:13,800 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639254423] [2021-05-02 18:24:13,800 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:24:13,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:13,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:24:13,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:24:13,801 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 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 18:24:14,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:14,891 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-05-02 18:24:14,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 18:24:14,892 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 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 18:24:14,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:14,892 INFO L225 Difference]: With dead ends: 69 [2021-05-02 18:24:14,892 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 18:24:14,893 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 1038.3ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 18:24:14,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 18:24:14,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-02 18:24:14,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:14,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-05-02 18:24:14,895 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2021-05-02 18:24:14,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:14,895 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-05-02 18:24:14,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 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 18:24:14,895 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-05-02 18:24:14,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 18:24:14,896 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:14,896 INFO L523 BasicCegarLoop]: trace histogram [28, 22, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:15,112 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:15,113 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:15,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:15,113 INFO L82 PathProgramCache]: Analyzing trace with hash 729952552, now seen corresponding path program 20 times [2021-05-02 18:24:15,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:15,113 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738931773] [2021-05-02 18:24:15,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:15,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:15,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:15,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:15,508 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 253 proven. 506 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:24:15,508 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:15,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738931773] [2021-05-02 18:24:15,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738931773] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:15,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671988098] [2021-05-02 18:24:15,508 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 18:24:15,571 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:24:15,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:15,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 18:24:15,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:15,923 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:15,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671988098] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:15,924 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:15,924 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 31] total 33 [2021-05-02 18:24:15,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880534710] [2021-05-02 18:24:15,924 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 18:24:15,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:15,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 18:24:15,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=970, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:24:15,925 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 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 18:24:17,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:17,440 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2021-05-02 18:24:17,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:24:17,441 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 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 67 [2021-05-02 18:24:17,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:17,441 INFO L225 Difference]: With dead ends: 71 [2021-05-02 18:24:17,441 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 18:24:17,442 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1426.4ms TimeCoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:24:17,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 18:24:17,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 18:24:17,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:17,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-05-02 18:24:17,443 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2021-05-02 18:24:17,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:17,443 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-05-02 18:24:17,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 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 18:24:17,443 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-05-02 18:24:17,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 18:24:17,444 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:17,444 INFO L523 BasicCegarLoop]: trace histogram [29, 23, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:17,644 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 18:24:17,645 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:17,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:17,645 INFO L82 PathProgramCache]: Analyzing trace with hash -954090810, now seen corresponding path program 21 times [2021-05-02 18:24:17,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:17,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803267204] [2021-05-02 18:24:17,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:17,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:18,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:18,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:18,094 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 264 proven. 552 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:24:18,094 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:18,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803267204] [2021-05-02 18:24:18,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803267204] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:18,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1175655681] [2021-05-02 18:24:18,094 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 18:24:18,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 18:24:18,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:18,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 18:24:18,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:18,600 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 299 proven. 36 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-05-02 18:24:18,600 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1175655681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:18,600 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:18,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 9] total 34 [2021-05-02 18:24:18,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024960342] [2021-05-02 18:24:18,601 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 18:24:18,601 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:18,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 18:24:18,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=932, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:24:18,602 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 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 18:24:21,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:21,404 INFO L93 Difference]: Finished difference Result 77 states and 80 transitions. [2021-05-02 18:24:21,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:24:21,405 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 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 69 [2021-05-02 18:24:21,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:21,405 INFO L225 Difference]: With dead ends: 77 [2021-05-02 18:24:21,405 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 18:24:21,406 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 2853.8ms TimeCoverageRelationStatistics Valid=533, Invalid=3757, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:24:21,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 18:24:21,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2021-05-02 18:24:21,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 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 18:24:21,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2021-05-02 18:24:21,408 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 69 [2021-05-02 18:24:21,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:21,408 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2021-05-02 18:24:21,408 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 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 18:24:21,409 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2021-05-02 18:24:21,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 18:24:21,409 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:21,409 INFO L523 BasicCegarLoop]: trace histogram [31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:21,616 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:21,617 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:21,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:21,617 INFO L82 PathProgramCache]: Analyzing trace with hash 83673505, now seen corresponding path program 22 times [2021-05-02 18:24:21,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:21,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20368540] [2021-05-02 18:24:21,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:21,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:22,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:22,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:22,082 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:24:22,082 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:22,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20368540] [2021-05-02 18:24:22,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20368540] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:22,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652976807] [2021-05-02 18:24:22,083 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 18:24:22,131 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:24:22,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:22,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 18:24:22,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:22,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:22,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:22,323 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:24:22,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [652976807] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:22,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:22,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 18:24:22,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287086962] [2021-05-02 18:24:22,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 18:24:22,324 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:22,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 18:24:22,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 18:24:22,325 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 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 18:24:23,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:23,708 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2021-05-02 18:24:23,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 18:24:23,708 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 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 73 [2021-05-02 18:24:23,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:23,709 INFO L225 Difference]: With dead ends: 77 [2021-05-02 18:24:23,709 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 18:24:23,709 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1242.7ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:24:23,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 18:24:23,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-02 18:24:23,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 3 states have call successors, (3), 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 18:24:23,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-05-02 18:24:23,711 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2021-05-02 18:24:23,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:23,711 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-05-02 18:24:23,711 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 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 18:24:23,712 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-05-02 18:24:23,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 18:24:23,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:23,712 INFO L523 BasicCegarLoop]: trace histogram [32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:23,912 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 18:24:23,913 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:23,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:23,913 INFO L82 PathProgramCache]: Analyzing trace with hash 153754815, now seen corresponding path program 23 times [2021-05-02 18:24:23,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:23,913 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715655672] [2021-05-02 18:24:23,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:23,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:24,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:24,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:24,481 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:24:24,481 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:24,481 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715655672] [2021-05-02 18:24:24,481 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715655672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:24,481 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758773216] [2021-05-02 18:24:24,481 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 18:24:28,622 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2021-05-02 18:24:28,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:28,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 18:24:28,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:29,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:24:29,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758773216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:29,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:29,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 18:24:29,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839547116] [2021-05-02 18:24:29,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:24:29,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:29,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:24:29,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:24:29,206 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 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 18:24:30,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:30,658 INFO L93 Difference]: Finished difference Result 79 states and 81 transitions. [2021-05-02 18:24:30,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 18:24:30,658 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 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 75 [2021-05-02 18:24:30,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:30,659 INFO L225 Difference]: With dead ends: 79 [2021-05-02 18:24:30,659 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 18:24:30,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 52 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 1753.0ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:24:30,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 18:24:30,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-02 18:24:30,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 3 states have call successors, (3), 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 18:24:30,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-02 18:24:30,661 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2021-05-02 18:24:30,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:30,662 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-02 18:24:30,662 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 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 18:24:30,662 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-02 18:24:30,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 18:24:30,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:30,662 INFO L523 BasicCegarLoop]: trace histogram [33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:30,867 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:24:30,867 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:30,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:30,868 INFO L82 PathProgramCache]: Analyzing trace with hash -1217583011, now seen corresponding path program 24 times [2021-05-02 18:24:30,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:30,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112996866] [2021-05-02 18:24:30,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:30,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:31,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:31,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:31,409 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 351 proven. 702 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:24:31,409 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:31,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112996866] [2021-05-02 18:24:31,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112996866] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:31,410 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77326854] [2021-05-02 18:24:31,410 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 18:24:32,148 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 18:24:32,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:32,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 60 conjunts are in the unsatisfiable core [2021-05-02 18:24:32,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:32,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:32,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:32,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:32,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:32,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:32,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:32,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:33,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 364 proven. 498 refuted. 0 times theorem prover too weak. 227 trivial. 0 not checked. [2021-05-02 18:24:33,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77326854] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:33,114 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:33,114 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 20] total 43 [2021-05-02 18:24:33,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437562215] [2021-05-02 18:24:33,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 18:24:33,114 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:33,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 18:24:33,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=1461, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 18:24:33,116 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 43 states, 43 states have (on average 2.186046511627907) internal successors, (94), 42 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 18:24:36,130 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:24:36,629 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:24:37,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:37,813 INFO L93 Difference]: Finished difference Result 97 states and 106 transitions. [2021-05-02 18:24:37,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 18:24:37,813 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.186046511627907) internal successors, (94), 42 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 77 [2021-05-02 18:24:37,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:37,814 INFO L225 Difference]: With dead ends: 97 [2021-05-02 18:24:37,814 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 18:24:37,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 71 SyntacticMatches, 4 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1055 ImplicationChecksByTransitivity, 5177.6ms TimeCoverageRelationStatistics Valid=1054, Invalid=6086, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 18:24:37,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 18:24:37,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 83. [2021-05-02 18:24:37,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 3 states have call successors, (3), 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 18:24:37,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-05-02 18:24:37,818 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 77 [2021-05-02 18:24:37,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:37,818 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-05-02 18:24:37,818 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.186046511627907) internal successors, (94), 42 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 18:24:37,818 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-05-02 18:24:37,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 18:24:37,819 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:37,819 INFO L523 BasicCegarLoop]: trace histogram [35, 27, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:38,023 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:24:38,023 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:38,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:38,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1094035320, now seen corresponding path program 25 times [2021-05-02 18:24:38,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:38,024 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167872871] [2021-05-02 18:24:38,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:38,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:38,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:38,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:38,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:24:38,630 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:38,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167872871] [2021-05-02 18:24:38,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1167872871] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:38,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128651421] [2021-05-02 18:24:38,631 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 18:24:38,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:38,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 18:24:38,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:38,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:38,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:38,897 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:24:38,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128651421] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:38,897 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:38,897 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 18:24:38,899 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671000630] [2021-05-02 18:24:38,899 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 18:24:38,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:38,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 18:24:38,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:24:38,900 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 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 18:24:40,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:40,542 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2021-05-02 18:24:40,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 18:24:40,543 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 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 81 [2021-05-02 18:24:40,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:40,543 INFO L225 Difference]: With dead ends: 85 [2021-05-02 18:24:40,543 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 18:24:40,544 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 1515.3ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 18:24:40,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 18:24:40,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-02 18:24:40,546 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 18:24:40,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-02 18:24:40,546 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2021-05-02 18:24:40,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:40,546 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-02 18:24:40,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 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 18:24:40,547 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-02 18:24:40,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 18:24:40,547 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:40,547 INFO L523 BasicCegarLoop]: trace histogram [36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:40,769 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:40,769 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:40,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:40,770 INFO L82 PathProgramCache]: Analyzing trace with hash 2078082198, now seen corresponding path program 26 times [2021-05-02 18:24:40,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:40,770 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621638129] [2021-05-02 18:24:40,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:40,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:41,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:41,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:41,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:24:41,370 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:41,370 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621638129] [2021-05-02 18:24:41,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [621638129] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:41,370 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186756112] [2021-05-02 18:24:41,370 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 18:24:41,416 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:24:41,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:41,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 81 conjunts are in the unsatisfiable core [2021-05-02 18:24:41,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:41,855 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:41,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [186756112] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:41,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:41,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 39] total 41 [2021-05-02 18:24:41,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743542195] [2021-05-02 18:24:41,855 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 18:24:41,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:41,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 18:24:41,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1532, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:24:41,856 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 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 18:24:43,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:43,843 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2021-05-02 18:24:43,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 18:24:43,844 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 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 18:24:43,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:43,844 INFO L225 Difference]: With dead ends: 87 [2021-05-02 18:24:43,844 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 18:24:43,845 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 1868.7ms TimeCoverageRelationStatistics Valid=253, Invalid=4577, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:24:43,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 18:24:43,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-02 18:24:43,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 3 states have call successors, (3), 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 18:24:43,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-02 18:24:43,847 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2021-05-02 18:24:43,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:43,847 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-02 18:24:43,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 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 18:24:43,847 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-02 18:24:43,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 18:24:43,848 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:43,848 INFO L523 BasicCegarLoop]: trace histogram [37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:44,057 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 18:24:44,057 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:44,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:44,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1440640460, now seen corresponding path program 27 times [2021-05-02 18:24:44,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:44,057 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577647718] [2021-05-02 18:24:44,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:44,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:44,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:44,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:44,750 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 450 proven. 870 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:24:44,751 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:44,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577647718] [2021-05-02 18:24:44,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [577647718] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:44,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953161203] [2021-05-02 18:24:44,751 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 18:24:44,882 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 18:24:44,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:44,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 18:24:44,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:45,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 493 proven. 64 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-05-02 18:24:45,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [953161203] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:45,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:45,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 11] total 42 [2021-05-02 18:24:45,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581454773] [2021-05-02 18:24:45,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 18:24:45,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:45,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 18:24:45,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1584, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:24:45,820 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 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 18:24:49,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:49,587 INFO L93 Difference]: Finished difference Result 91 states and 93 transitions. [2021-05-02 18:24:49,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 18:24:49,588 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 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 85 [2021-05-02 18:24:49,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:49,588 INFO L225 Difference]: With dead ends: 91 [2021-05-02 18:24:49,588 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 18:24:49,589 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 84 SyntacticMatches, 3 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 762 ImplicationChecksByTransitivity, 3235.3ms TimeCoverageRelationStatistics Valid=409, Invalid=6071, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 18:24:49,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 18:24:49,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-05-02 18:24:49,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 3 states have call successors, (3), 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 18:24:49,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2021-05-02 18:24:49,591 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 85 [2021-05-02 18:24:49,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:49,591 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2021-05-02 18:24:49,591 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 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 18:24:49,591 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2021-05-02 18:24:49,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 18:24:49,591 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:49,592 INFO L523 BasicCegarLoop]: trace histogram [39, 30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:49,795 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:49,796 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:49,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:49,796 INFO L82 PathProgramCache]: Analyzing trace with hash 401045903, now seen corresponding path program 28 times [2021-05-02 18:24:49,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:49,796 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981185664] [2021-05-02 18:24:49,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:49,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:50,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:50,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:50,562 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:24:50,562 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:50,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981185664] [2021-05-02 18:24:50,562 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981185664] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:50,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419367688] [2021-05-02 18:24:50,563 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 18:24:50,620 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:24:50,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:50,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 18:24:50,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:50,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:50,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:50,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:24:50,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419367688] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:50,846 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:50,846 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 18:24:50,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593707270] [2021-05-02 18:24:50,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 18:24:50,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:50,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 18:24:50,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 18:24:50,847 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 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 18:24:52,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:52,788 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2021-05-02 18:24:52,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 18:24:52,788 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 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 89 [2021-05-02 18:24:52,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:52,789 INFO L225 Difference]: With dead ends: 93 [2021-05-02 18:24:52,789 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 18:24:52,789 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 470 ImplicationChecksByTransitivity, 1841.8ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:24:52,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 18:24:52,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-02 18:24:52,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 3 states have call successors, (3), 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 18:24:52,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-05-02 18:24:52,791 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2021-05-02 18:24:52,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:52,792 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-05-02 18:24:52,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 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 18:24:52,792 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-05-02 18:24:52,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 18:24:52,792 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:52,792 INFO L523 BasicCegarLoop]: trace histogram [40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:53,000 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 18:24:53,001 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:53,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:53,001 INFO L82 PathProgramCache]: Analyzing trace with hash -135866195, now seen corresponding path program 29 times [2021-05-02 18:24:53,001 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:53,001 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64272715] [2021-05-02 18:24:53,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:53,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:53,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:53,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:53,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 544 proven. 992 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:24:53,668 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:53,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64272715] [2021-05-02 18:24:53,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64272715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:53,669 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972153772] [2021-05-02 18:24:53,669 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 [2021-05-02 18:25:01,125 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 41 check-sat command(s) [2021-05-02 18:25:01,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:01,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 18:25:01,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:01,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:01,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:01,930 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 442 proven. 1122 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:25:01,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972153772] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:01,930 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:01,930 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 36] total 38 [2021-05-02 18:25:01,930 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024479384] [2021-05-02 18:25:01,931 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 18:25:01,931 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:01,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 18:25:01,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1301, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:25:01,931 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 18:25:04,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:04,146 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2021-05-02 18:25:04,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:25:04,147 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 91 [2021-05-02 18:25:04,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:04,148 INFO L225 Difference]: With dead ends: 95 [2021-05-02 18:25:04,148 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 18:25:04,148 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 70 SyntacticMatches, 21 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 2398.6ms TimeCoverageRelationStatistics Valid=265, Invalid=4565, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:25:04,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 18:25:04,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-05-02 18:25:04,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 3 states have call successors, (3), 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 18:25:04,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2021-05-02 18:25:04,150 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2021-05-02 18:25:04,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:04,150 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2021-05-02 18:25:04,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 18:25:04,151 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2021-05-02 18:25:04,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 18:25:04,151 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:04,151 INFO L523 BasicCegarLoop]: trace histogram [41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:04,357 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 18:25:04,357 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:04,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:04,358 INFO L82 PathProgramCache]: Analyzing trace with hash -712316853, now seen corresponding path program 30 times [2021-05-02 18:25:04,358 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:04,358 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117476696] [2021-05-02 18:25:04,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:04,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:05,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:05,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:05,090 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:25:05,090 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:05,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117476696] [2021-05-02 18:25:05,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117476696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:05,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090046559] [2021-05-02 18:25:05,090 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:07,527 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 39 check-sat command(s) [2021-05-02 18:25:07,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:07,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 18:25:07,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:08,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:08,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:09,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 740 proven. 289 refuted. 0 times theorem prover too weak. 652 trivial. 0 not checked. [2021-05-02 18:25:09,013 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090046559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:09,013 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:09,013 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 17] total 51 [2021-05-02 18:25:09,013 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53697637] [2021-05-02 18:25:09,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 18:25:09,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:09,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 18:25:09,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=448, Invalid=2102, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 18:25:09,014 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 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 18:25:12,718 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:25:13,613 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:25:14,816 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:25:15,740 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:25:16,705 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:25:17,230 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:25:18,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:18,363 INFO L93 Difference]: Finished difference Result 113 states and 122 transitions. [2021-05-02 18:25:18,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 18:25:18,364 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 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 93 [2021-05-02 18:25:18,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:18,369 INFO L225 Difference]: With dead ends: 113 [2021-05-02 18:25:18,369 INFO L226 Difference]: Without dead ends: 113 [2021-05-02 18:25:18,370 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 86 SyntacticMatches, 4 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1483 ImplicationChecksByTransitivity, 10045.4ms TimeCoverageRelationStatistics Valid=1345, Invalid=8755, Unknown=0, NotChecked=0, Total=10100 [2021-05-02 18:25:18,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-02 18:25:18,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 99. [2021-05-02 18:25:18,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 3 states have call successors, (3), 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 18:25:18,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2021-05-02 18:25:18,372 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 93 [2021-05-02 18:25:18,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:18,373 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2021-05-02 18:25:18,374 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 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 18:25:18,374 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2021-05-02 18:25:18,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 18:25:18,374 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:18,374 INFO L523 BasicCegarLoop]: trace histogram [43, 33, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:18,579 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 18:25:18,580 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:18,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:18,580 INFO L82 PathProgramCache]: Analyzing trace with hash 505554918, now seen corresponding path program 31 times [2021-05-02 18:25:18,580 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:18,580 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346301525] [2021-05-02 18:25:18,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:18,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:19,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:19,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:19,381 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:25:19,382 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:19,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346301525] [2021-05-02 18:25:19,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346301525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:19,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367526080] [2021-05-02 18:25:19,382 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:19,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:19,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 18:25:19,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:19,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:19,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:19,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:25:19,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367526080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:19,767 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:19,767 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 18:25:19,767 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963011809] [2021-05-02 18:25:19,767 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 18:25:19,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:19,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 18:25:19,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:25:19,768 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 18:25:22,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:22,236 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2021-05-02 18:25:22,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 18:25:22,237 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 97 [2021-05-02 18:25:22,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:22,238 INFO L225 Difference]: With dead ends: 101 [2021-05-02 18:25:22,238 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 18:25:22,238 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 2073.9ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 18:25:22,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 18:25:22,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-05-02 18:25:22,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 3 states have call successors, (3), 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 18:25:22,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-05-02 18:25:22,240 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2021-05-02 18:25:22,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:22,240 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-05-02 18:25:22,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 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 18:25:22,241 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-05-02 18:25:22,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 18:25:22,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:22,241 INFO L523 BasicCegarLoop]: trace histogram [44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:22,444 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 18:25:22,445 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:22,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:22,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1415022852, now seen corresponding path program 32 times [2021-05-02 18:25:22,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:22,445 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472475494] [2021-05-02 18:25:22,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:22,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:23,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:23,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:23,324 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 665 proven. 1190 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:25:23,324 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:23,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472475494] [2021-05-02 18:25:23,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472475494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:23,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1983351696] [2021-05-02 18:25:23,325 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:23,375 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:25:23,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:23,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 18:25:23,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:24,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:25:24,004 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1983351696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:24,004 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:24,005 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 47] total 49 [2021-05-02 18:25:24,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290265628] [2021-05-02 18:25:24,005 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 18:25:24,005 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:24,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 18:25:24,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2222, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:25:24,006 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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 18:25:26,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:26,999 INFO L93 Difference]: Finished difference Result 103 states and 105 transitions. [2021-05-02 18:25:26,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 18:25:27,000 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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 99 [2021-05-02 18:25:27,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:27,000 INFO L225 Difference]: With dead ends: 103 [2021-05-02 18:25:27,000 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 18:25:27,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 2793.5ms TimeCoverageRelationStatistics Valid=305, Invalid=6667, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:25:27,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 18:25:27,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-02 18:25:27,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 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 18:25:27,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 18:25:27,003 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2021-05-02 18:25:27,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:27,003 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 18:25:27,003 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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 18:25:27,003 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 18:25:27,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 18:25:27,004 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:27,004 INFO L523 BasicCegarLoop]: trace histogram [45, 35, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:27,208 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 18:25:27,209 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:27,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:27,209 INFO L82 PathProgramCache]: Analyzing trace with hash -759620958, now seen corresponding path program 33 times [2021-05-02 18:25:27,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:27,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170017644] [2021-05-02 18:25:27,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:27,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:28,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:28,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:28,067 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 684 proven. 1260 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:25:28,067 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:28,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170017644] [2021-05-02 18:25:28,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170017644] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:28,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1463086667] [2021-05-02 18:25:28,068 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:28,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 18:25:28,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:28,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 18:25:28,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:28,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:29,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 735 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-02 18:25:29,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1463086667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:29,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:29,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 13] total 50 [2021-05-02 18:25:29,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539095887] [2021-05-02 18:25:29,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:25:29,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:29,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:25:29,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=2168, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:25:29,620 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 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 18:25:34,810 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:25:35,823 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:25:37,362 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:25:39,306 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:25:40,164 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:25:41,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:41,174 INFO L93 Difference]: Finished difference Result 109 states and 112 transitions. [2021-05-02 18:25:41,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 18:25:41,175 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 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 18:25:41,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:41,175 INFO L225 Difference]: With dead ends: 109 [2021-05-02 18:25:41,175 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 18:25:41,176 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 99 SyntacticMatches, 4 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1197 ImplicationChecksByTransitivity, 11536.4ms TimeCoverageRelationStatistics Valid=797, Invalid=8709, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 18:25:41,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 18:25:41,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2021-05-02 18:25:41,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 3 states have call successors, (3), 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 18:25:41,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2021-05-02 18:25:41,178 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 101 [2021-05-02 18:25:41,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:41,178 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2021-05-02 18:25:41,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 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 18:25:41,178 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2021-05-02 18:25:41,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 18:25:41,179 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:41,179 INFO L523 BasicCegarLoop]: trace histogram [47, 36, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:41,383 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 18:25:41,383 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:41,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:41,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1430674819, now seen corresponding path program 34 times [2021-05-02 18:25:41,384 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:41,384 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718582069] [2021-05-02 18:25:41,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:41,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:42,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:42,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:42,347 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:25:42,347 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:42,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718582069] [2021-05-02 18:25:42,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [718582069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:42,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170843929] [2021-05-02 18:25:42,347 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:42,403 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:25:42,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:42,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 18:25:42,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:42,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:42,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:42,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:25:42,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170843929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:42,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:42,678 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 18:25:42,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874530412] [2021-05-02 18:25:42,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 18:25:42,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:42,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 18:25:42,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:25:42,679 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 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 18:25:45,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:45,506 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2021-05-02 18:25:45,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 18:25:45,507 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 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 105 [2021-05-02 18:25:45,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:45,507 INFO L225 Difference]: With dead ends: 109 [2021-05-02 18:25:45,507 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 18:25:45,508 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 2382.4ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 18:25:45,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 18:25:45,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-02 18:25:45,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 states have call successors, (3), 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 18:25:45,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-02 18:25:45,510 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2021-05-02 18:25:45,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:45,510 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-02 18:25:45,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 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 18:25:45,511 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-02 18:25:45,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 18:25:45,511 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:45,511 INFO L523 BasicCegarLoop]: trace histogram [48, 37, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:45,721 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 18:25:45,721 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:45,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:45,721 INFO L82 PathProgramCache]: Analyzing trace with hash 704841115, now seen corresponding path program 35 times [2021-05-02 18:25:45,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:45,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168583937] [2021-05-02 18:25:45,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:45,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:46,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:46,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:46,811 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:25:46,811 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:46,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168583937] [2021-05-02 18:25:46,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1168583937] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:46,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779791764] [2021-05-02 18:25:46,811 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:08,776 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 49 check-sat command(s) [2021-05-02 18:26:08,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:08,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 18:26:08,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:09,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:09,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:09,211 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 741 proven. 1482 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:26:09,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779791764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:09,213 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:09,213 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 43 [2021-05-02 18:26:09,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322725388] [2021-05-02 18:26:09,213 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 18:26:09,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:09,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 18:26:09,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1685, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 18:26:09,214 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 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 18:26:12,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:12,236 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-05-02 18:26:12,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 18:26:12,237 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 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 107 [2021-05-02 18:26:12,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:12,238 INFO L225 Difference]: With dead ends: 111 [2021-05-02 18:26:12,238 INFO L226 Difference]: Without dead ends: 111 [2021-05-02 18:26:12,238 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 104 SyntacticMatches, 4 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 2657.9ms TimeCoverageRelationStatistics Valid=311, Invalid=6169, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 18:26:12,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-02 18:26:12,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-02 18:26:12,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 3 states have call successors, (3), 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 18:26:12,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-02 18:26:12,241 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2021-05-02 18:26:12,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:12,241 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-02 18:26:12,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 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 18:26:12,241 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-02 18:26:12,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 18:26:12,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:12,241 INFO L523 BasicCegarLoop]: trace histogram [49, 38, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:12,442 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 18:26:12,442 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:12,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:12,442 INFO L82 PathProgramCache]: Analyzing trace with hash -58713799, now seen corresponding path program 36 times [2021-05-02 18:26:12,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:12,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31377507] [2021-05-02 18:26:12,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:12,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:13,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:13,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:13,469 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 819 proven. 1482 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:26:13,469 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:13,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31377507] [2021-05-02 18:26:13,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31377507] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:13,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1143229444] [2021-05-02 18:26:13,470 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:19,557 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 47 check-sat command(s) [2021-05-02 18:26:19,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:19,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 18:26:19,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:19,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:19,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:19,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:19,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:19,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:19,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:22,564 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 874 proven. 121 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2021-05-02 18:26:22,564 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1143229444] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:22,564 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:22,564 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 14] total 54 [2021-05-02 18:26:22,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245590905] [2021-05-02 18:26:22,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 18:26:22,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:22,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 18:26:22,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=2682, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:26:22,565 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 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 18:26:29,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:29,195 INFO L93 Difference]: Finished difference Result 115 states and 117 transitions. [2021-05-02 18:26:29,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 18:26:29,195 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 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 109 [2021-05-02 18:26:29,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:29,196 INFO L225 Difference]: With dead ends: 115 [2021-05-02 18:26:29,196 INFO L226 Difference]: Without dead ends: 115 [2021-05-02 18:26:29,196 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 99 SyntacticMatches, 12 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1320 ImplicationChecksByTransitivity, 6676.5ms TimeCoverageRelationStatistics Valid=535, Invalid=10385, Unknown=0, NotChecked=0, Total=10920 [2021-05-02 18:26:29,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-02 18:26:29,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-05-02 18:26:29,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 3 states have call successors, (3), 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 18:26:29,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-02 18:26:29,198 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 109 [2021-05-02 18:26:29,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:29,199 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-02 18:26:29,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 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 18:26:29,199 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-02 18:26:29,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 18:26:29,199 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:29,199 INFO L523 BasicCegarLoop]: trace histogram [51, 39, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:29,405 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:29,405 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:29,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:29,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1967511892, now seen corresponding path program 37 times [2021-05-02 18:26:29,405 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:29,405 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353554246] [2021-05-02 18:26:29,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:29,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:30,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:30,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:30,436 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:26:30,436 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:30,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353554246] [2021-05-02 18:26:30,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353554246] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:30,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855125479] [2021-05-02 18:26:30,436 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:30,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:30,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 18:26:30,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:30,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:30,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:30,798 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:26:30,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855125479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:30,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:30,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 18:26:30,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136796043] [2021-05-02 18:26:30,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 18:26:30,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:30,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 18:26:30,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:26:30,799 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 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 18:26:33,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:33,966 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2021-05-02 18:26:33,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:26:33,967 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 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 113 [2021-05-02 18:26:33,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:33,967 INFO L225 Difference]: With dead ends: 117 [2021-05-02 18:26:33,967 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 18:26:33,968 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 785 ImplicationChecksByTransitivity, 2650.8ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:26:33,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 18:26:33,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-05-02 18:26:33,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 3 states have call successors, (3), 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 18:26:33,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-05-02 18:26:33,970 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 113 [2021-05-02 18:26:33,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:33,970 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-05-02 18:26:33,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 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 18:26:33,971 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-05-02 18:26:33,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-02 18:26:33,971 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:33,971 INFO L523 BasicCegarLoop]: trace histogram [52, 40, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:34,171 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:34,172 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:34,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:34,172 INFO L82 PathProgramCache]: Analyzing trace with hash 1921072754, now seen corresponding path program 38 times [2021-05-02 18:26:34,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:34,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544964249] [2021-05-02 18:26:34,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:34,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:35,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:35,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:35,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 943 proven. 1640 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:26:35,274 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:35,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544964249] [2021-05-02 18:26:35,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [544964249] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:35,275 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079201318] [2021-05-02 18:26:35,275 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:35,328 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:26:35,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:35,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 113 conjunts are in the unsatisfiable core [2021-05-02 18:26:35,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:36,138 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:26:36,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079201318] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:36,139 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:36,139 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 55] total 57 [2021-05-02 18:26:36,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467471776] [2021-05-02 18:26:36,139 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 18:26:36,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:36,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 18:26:36,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=3040, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 18:26:36,140 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 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 18:26:40,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:40,177 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2021-05-02 18:26:40,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 18:26:40,178 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 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 115 [2021-05-02 18:26:40,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:40,178 INFO L225 Difference]: With dead ends: 119 [2021-05-02 18:26:40,178 INFO L226 Difference]: Without dead ends: 119 [2021-05-02 18:26:40,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 103 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 3555.5ms TimeCoverageRelationStatistics Valid=357, Invalid=9149, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 18:26:40,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-02 18:26:40,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-05-02 18:26:40,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 114 states have internal predecessors, (117), 3 states have call successors, (3), 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 18:26:40,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-05-02 18:26:40,181 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 115 [2021-05-02 18:26:40,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:40,182 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-05-02 18:26:40,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 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 18:26:40,182 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-05-02 18:26:40,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-02 18:26:40,182 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:40,183 INFO L523 BasicCegarLoop]: trace histogram [53, 41, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:40,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 18:26:40,393 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:40,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:40,393 INFO L82 PathProgramCache]: Analyzing trace with hash 242734096, now seen corresponding path program 39 times [2021-05-02 18:26:40,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:40,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719184313] [2021-05-02 18:26:40,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:40,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:41,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:41,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:41,600 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 966 proven. 1722 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:26:41,600 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:41,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719184313] [2021-05-02 18:26:41,600 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719184313] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:41,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201946452] [2021-05-02 18:26:41,601 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:41,924 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-05-02 18:26:41,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:41,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 18:26:41,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:41,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:41,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:41,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:41,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:41,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:41,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:41,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:41,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:45,371 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 1025 proven. 144 refuted. 0 times theorem prover too weak. 1640 trivial. 0 not checked. [2021-05-02 18:26:45,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201946452] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:45,371 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:45,372 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15] total 58 [2021-05-02 18:26:45,372 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683817481] [2021-05-02 18:26:45,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 18:26:45,372 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:45,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 18:26:45,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=3074, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 18:26:45,373 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 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 18:26:55,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:55,076 INFO L93 Difference]: Finished difference Result 125 states and 128 transitions. [2021-05-02 18:26:55,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 18:26:55,076 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 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 117 [2021-05-02 18:26:55,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:55,077 INFO L225 Difference]: With dead ends: 125 [2021-05-02 18:26:55,077 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 18:26:55,077 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 108 SyntacticMatches, 11 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1606 ImplicationChecksByTransitivity, 9642.0ms TimeCoverageRelationStatistics Valid=709, Invalid=12173, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 18:26:55,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 18:26:55,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2021-05-02 18:26:55,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 3 states have call successors, (3), 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 18:26:55,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 125 transitions. [2021-05-02 18:26:55,080 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 125 transitions. Word has length 117 [2021-05-02 18:26:55,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:55,080 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 125 transitions. [2021-05-02 18:26:55,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 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 18:26:55,080 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 125 transitions. [2021-05-02 18:26:55,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-02 18:26:55,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:55,081 INFO L523 BasicCegarLoop]: trace histogram [55, 42, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:55,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:55,285 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:55,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:55,285 INFO L82 PathProgramCache]: Analyzing trace with hash 1965210731, now seen corresponding path program 40 times [2021-05-02 18:26:55,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:55,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958705297] [2021-05-02 18:26:55,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:55,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:56,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:56,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:56,615 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:26:56,615 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:56,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958705297] [2021-05-02 18:26:56,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1958705297] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:56,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314686536] [2021-05-02 18:26:56,615 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:56,695 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:26:56,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:56,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 18:26:56,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:56,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:56,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:57,007 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:26:57,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314686536] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:57,008 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:57,008 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 18:26:57,008 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879929851] [2021-05-02 18:26:57,008 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 18:26:57,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:57,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 18:26:57,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:26:57,009 INFO L87 Difference]: Start difference. First operand 123 states and 125 transitions. Second operand has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 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 18:27:00,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:27:00,781 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-05-02 18:27:00,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:27:00,782 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 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 121 [2021-05-02 18:27:00,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:27:00,783 INFO L225 Difference]: With dead ends: 125 [2021-05-02 18:27:00,783 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 18:27:00,783 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 3180.0ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 18:27:00,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 18:27:00,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-05-02 18:27:00,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 3 states have call successors, (3), 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 18:27:00,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2021-05-02 18:27:00,786 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 121 [2021-05-02 18:27:00,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:27:00,786 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2021-05-02 18:27:00,786 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 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 18:27:00,786 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2021-05-02 18:27:00,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 18:27:00,787 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:27:00,787 INFO L523 BasicCegarLoop]: trace histogram [56, 43, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:27:00,992 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:27:00,993 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:27:00,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:27:00,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1731077001, now seen corresponding path program 41 times [2021-05-02 18:27:00,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:27:00,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084485827] [2021-05-02 18:27:00,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:27:01,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:02,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:27:02,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:02,307 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 1100 proven. 1892 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:27:02,308 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:27:02,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084485827] [2021-05-02 18:27:02,308 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1084485827] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:27:02,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [751862363] [2021-05-02 18:27:02,308 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:27:34,482 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 57 check-sat command(s) [2021-05-02 18:27:34,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:27:34,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 134 conjunts are in the unsatisfiable core [2021-05-02 18:27:34,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:27:36,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:27:36,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:27:36,254 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 893 proven. 2162 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:27:36,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [751862363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:27:36,255 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:27:36,255 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 49] total 51 [2021-05-02 18:27:36,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120762822] [2021-05-02 18:27:36,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 18:27:36,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:27:36,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 18:27:36,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2407, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 18:27:36,256 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 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 18:27:40,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:27:40,471 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2021-05-02 18:27:40,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 18:27:40,471 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 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 123 [2021-05-02 18:27:40,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:27:40,472 INFO L225 Difference]: With dead ends: 127 [2021-05-02 18:27:40,472 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 18:27:40,472 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 82 SyntacticMatches, 40 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 4768.6ms TimeCoverageRelationStatistics Valid=363, Invalid=8567, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 18:27:40,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 18:27:40,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-02 18:27:40,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 122 states have internal predecessors, (125), 3 states have call successors, (3), 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 18:27:40,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2021-05-02 18:27:40,474 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 123 [2021-05-02 18:27:40,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:27:40,474 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2021-05-02 18:27:40,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 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 18:27:40,474 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2021-05-02 18:27:40,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 18:27:40,475 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:27:40,475 INFO L523 BasicCegarLoop]: trace histogram [57, 44, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:27:40,675 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 18:27:40,675 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:27:40,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:27:40,676 INFO L82 PathProgramCache]: Analyzing trace with hash 66861863, now seen corresponding path program 42 times [2021-05-02 18:27:40,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:27:40,676 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [798896901] [2021-05-02 18:27:40,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:27:40,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:41,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:27:41,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:41,957 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1125 proven. 1980 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:27:41,957 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:27:41,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [798896901] [2021-05-02 18:27:41,957 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [798896901] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:27:41,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1424304104] [2021-05-02 18:27:41,958 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:27:55,230 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2021-05-02 18:27:55,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:27:55,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 18:27:55,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:27:55,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:27:56,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:27:57,687 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1368 proven. 473 refuted. 0 times theorem prover too weak. 1408 trivial. 0 not checked. [2021-05-02 18:27:57,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1424304104] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:27:57,687 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:27:57,687 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 21] total 67 [2021-05-02 18:27:57,687 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116073151] [2021-05-02 18:27:57,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-02 18:27:57,688 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:27:57,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-02 18:27:57,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=736, Invalid=3686, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 18:27:57,689 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 67 states, 67 states have (on average 2.1194029850746268) internal successors, (142), 66 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 18:28:02,348 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 45 [2021-05-02 18:28:03,106 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:28:04,757 WARN L205 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:28:07,105 WARN L205 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:28:10,405 WARN L205 SmtUtils]: Spent 414.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:28:15,812 WARN L205 SmtUtils]: Spent 510.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:28:19,298 WARN L205 SmtUtils]: Spent 414.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:28:22,840 WARN L205 SmtUtils]: Spent 394.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:28:26,101 WARN L205 SmtUtils]: Spent 610.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:28:28,293 WARN L205 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:28:30,339 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:28:31,875 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:28:34,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:28:34,359 INFO L93 Difference]: Finished difference Result 145 states and 154 transitions. [2021-05-02 18:28:34,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-02 18:28:34,360 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.1194029850746268) internal successors, (142), 66 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 125 [2021-05-02 18:28:34,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:28:34,361 INFO L225 Difference]: With dead ends: 145 [2021-05-02 18:28:34,361 INFO L226 Difference]: Without dead ends: 145 [2021-05-02 18:28:34,362 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 118 SyntacticMatches, 4 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2525 ImplicationChecksByTransitivity, 37805.7ms TimeCoverageRelationStatistics Valid=2125, Invalid=15431, Unknown=0, NotChecked=0, Total=17556 [2021-05-02 18:28:34,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-05-02 18:28:34,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 131. [2021-05-02 18:28:34,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 3 states have call successors, (3), 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 18:28:34,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-05-02 18:28:34,364 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 125 [2021-05-02 18:28:34,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:28:34,364 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-05-02 18:28:34,365 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 2.1194029850746268) internal successors, (142), 66 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 18:28:34,365 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-05-02 18:28:34,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-02 18:28:34,365 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:28:34,365 INFO L523 BasicCegarLoop]: trace histogram [59, 45, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:28:34,572 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 18:28:34,573 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:28:34,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:28:34,573 INFO L82 PathProgramCache]: Analyzing trace with hash 7355330, now seen corresponding path program 43 times [2021-05-02 18:28:34,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:28:34,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372450620] [2021-05-02 18:28:34,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:28:34,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:36,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:28:36,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:36,063 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:28:36,063 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:28:36,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372450620] [2021-05-02 18:28:36,063 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372450620] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:36,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2029399888] [2021-05-02 18:28:36,064 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:28:36,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:36,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 18:28:36,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:28:36,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:36,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:36,516 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:28:36,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2029399888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:36,516 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:28:36,516 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 18:28:36,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176697790] [2021-05-02 18:28:36,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:28:36,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:28:36,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:28:36,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:28:36,518 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 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 18:28:41,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:28:41,335 INFO L93 Difference]: Finished difference Result 133 states and 135 transitions. [2021-05-02 18:28:41,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:28:41,336 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 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 129 [2021-05-02 18:28:41,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:28:41,337 INFO L225 Difference]: With dead ends: 133 [2021-05-02 18:28:41,337 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 18:28:41,338 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 3761.6ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 18:28:41,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 18:28:41,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-05-02 18:28:41,340 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 18:28:41,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-02 18:28:41,341 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 129 [2021-05-02 18:28:41,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:28:41,341 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-02 18:28:41,341 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 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 18:28:41,341 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-02 18:28:41,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 18:28:41,342 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:28:41,342 INFO L523 BasicCegarLoop]: trace histogram [60, 46, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:28:41,553 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 18:28:41,553 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:28:41,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:28:41,553 INFO L82 PathProgramCache]: Analyzing trace with hash -1607883552, now seen corresponding path program 44 times [2021-05-02 18:28:41,553 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:28:41,553 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727143120] [2021-05-02 18:28:41,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:28:41,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:43,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:28:43,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:43,157 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 1269 proven. 2162 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:28:43,157 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:28:43,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727143120] [2021-05-02 18:28:43,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [727143120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:43,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957881173] [2021-05-02 18:28:43,157 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:28:43,216 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:28:43,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:28:43,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 129 conjunts are in the unsatisfiable core [2021-05-02 18:28:43,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:28:44,414 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:28:44,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957881173] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:44,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:28:44,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 63] total 65 [2021-05-02 18:28:44,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314290443] [2021-05-02 18:28:44,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 18:28:44,415 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:28:44,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 18:28:44,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=3986, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 18:28:44,416 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 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 18:28:50,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:28:50,729 INFO L93 Difference]: Finished difference Result 135 states and 137 transitions. [2021-05-02 18:28:50,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 18:28:50,730 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 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 18:28:50,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:28:50,731 INFO L225 Difference]: With dead ends: 135 [2021-05-02 18:28:50,731 INFO L226 Difference]: Without dead ends: 135 [2021-05-02 18:28:50,732 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 5255.9ms TimeCoverageRelationStatistics Valid=409, Invalid=12023, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 18:28:50,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-02 18:28:50,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-05-02 18:28:50,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 3 states have call successors, (3), 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 18:28:50,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-02 18:28:50,734 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 131 [2021-05-02 18:28:50,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:28:50,735 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-02 18:28:50,735 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 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 18:28:50,735 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-02 18:28:50,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-02 18:28:50,736 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:28:50,736 INFO L523 BasicCegarLoop]: trace histogram [61, 47, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:28:50,956 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:28:50,957 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:28:50,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:28:50,957 INFO L82 PathProgramCache]: Analyzing trace with hash 925711998, now seen corresponding path program 45 times [2021-05-02 18:28:50,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:28:50,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46195615] [2021-05-02 18:28:50,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:28:50,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:52,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:28:52,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:52,569 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1296 proven. 2256 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:28:52,569 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:28:52,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46195615] [2021-05-02 18:28:52,569 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [46195615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:52,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024675243] [2021-05-02 18:28:52,569 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:28:53,163 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-05-02 18:28:53,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:28:53,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 18:28:53,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:28:55,944 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1363 proven. 196 refuted. 0 times theorem prover too weak. 2162 trivial. 0 not checked. [2021-05-02 18:28:55,944 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024675243] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:55,944 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:28:55,944 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 17] total 66 [2021-05-02 18:28:55,944 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488891145] [2021-05-02 18:28:55,945 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 18:28:55,945 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:28:55,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 18:28:55,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=3982, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:28:55,946 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 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 18:29:06,290 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:29:07,184 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:29:08,371 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:29:12,165 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:29:13,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:29:13,191 INFO L93 Difference]: Finished difference Result 141 states and 144 transitions. [2021-05-02 18:29:13,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 18:29:13,192 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 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 133 [2021-05-02 18:29:13,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:29:13,193 INFO L225 Difference]: With dead ends: 141 [2021-05-02 18:29:13,193 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 18:29:13,194 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2079 ImplicationChecksByTransitivity, 15963.0ms TimeCoverageRelationStatistics Valid=909, Invalid=15861, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 18:29:13,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 18:29:13,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2021-05-02 18:29:13,196 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 18:29:13,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 18:29:13,197 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 133 [2021-05-02 18:29:13,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:29:13,197 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 18:29:13,197 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 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 18:29:13,198 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 18:29:13,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 18:29:13,198 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:29:13,198 INFO L523 BasicCegarLoop]: trace histogram [63, 48, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:29:13,403 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 18:29:13,403 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:29:13,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:29:13,404 INFO L82 PathProgramCache]: Analyzing trace with hash 722618201, now seen corresponding path program 46 times [2021-05-02 18:29:13,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:29:13,404 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634782458] [2021-05-02 18:29:13,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:29:13,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:29:15,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:29:15,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:29:15,178 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:29:15,178 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:29:15,179 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634782458] [2021-05-02 18:29:15,179 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634782458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:29:15,179 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1175592036] [2021-05-02 18:29:15,179 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:29:15,272 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:29:15,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:29:15,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-02 18:29:15,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:29:15,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:29:15,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:29:15,765 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:29:15,766 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1175592036] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:29:15,766 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:29:15,766 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 18:29:15,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000637095] [2021-05-02 18:29:15,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 18:29:15,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:29:15,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 18:29:15,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 18:29:15,767 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 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 18:29:21,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:29:21,783 INFO L93 Difference]: Finished difference Result 141 states and 143 transitions. [2021-05-02 18:29:21,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 18:29:21,784 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 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 18:29:21,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:29:21,785 INFO L225 Difference]: With dead ends: 141 [2021-05-02 18:29:21,785 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 18:29:21,785 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 4517.7ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 18:29:21,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 18:29:21,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-05-02 18:29:21,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 3 states have call successors, (3), 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 18:29:21,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-05-02 18:29:21,788 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 137 [2021-05-02 18:29:21,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:29:21,788 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-05-02 18:29:21,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 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 18:29:21,789 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-05-02 18:29:21,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-02 18:29:21,789 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:29:21,789 INFO L523 BasicCegarLoop]: trace histogram [64, 49, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:29:22,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:29:22,013 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:29:22,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:29:22,013 INFO L82 PathProgramCache]: Analyzing trace with hash 1935127159, now seen corresponding path program 47 times [2021-05-02 18:29:22,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:29:22,014 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125871224] [2021-05-02 18:29:22,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:29:22,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:29:23,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:29:23,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:29:23,887 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1450 proven. 2450 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:29:23,887 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:29:23,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125871224] [2021-05-02 18:29:23,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [125871224] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:29:23,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711731334] [2021-05-02 18:29:23,887 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:30:10,830 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 65 check-sat command(s) [2021-05-02 18:30:10,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:30:10,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-02 18:30:10,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:30:11,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:30:11,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:30:11,786 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1045 proven. 2970 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:30:11,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711731334] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:30:11,786 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:30:11,786 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 57] total 59 [2021-05-02 18:30:11,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931479435] [2021-05-02 18:30:11,787 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 18:30:11,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:30:11,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 18:30:11,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=3257, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 18:30:11,787 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 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 18:30:19,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:30:19,364 INFO L93 Difference]: Finished difference Result 143 states and 145 transitions. [2021-05-02 18:30:19,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 18:30:19,365 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 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 139 [2021-05-02 18:30:19,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:30:19,366 INFO L225 Difference]: With dead ends: 143 [2021-05-02 18:30:19,366 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 18:30:19,366 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 131 SyntacticMatches, 5 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 5615.0ms TimeCoverageRelationStatistics Valid=415, Invalid=11357, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 18:30:19,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 18:30:19,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-05-02 18:30:19,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 3 states have call successors, (3), 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 18:30:19,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-02 18:30:19,369 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 139 [2021-05-02 18:30:19,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:30:19,369 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-02 18:30:19,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 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 18:30:19,370 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-02 18:30:19,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 18:30:19,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:30:19,370 INFO L523 BasicCegarLoop]: trace histogram [65, 50, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:30:19,571 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:30:19,571 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:30:19,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:30:19,572 INFO L82 PathProgramCache]: Analyzing trace with hash -1074868715, now seen corresponding path program 48 times [2021-05-02 18:30:19,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:30:19,572 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952113037] [2021-05-02 18:30:19,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:30:19,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:30:21,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:30:21,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:30:21,713 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1479 proven. 2550 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:30:21,713 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:30:21,713 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952113037] [2021-05-02 18:30:21,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952113037] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:30:21,713 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225889408] [2021-05-02 18:30:21,713 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:30:36,484 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 63 check-sat command(s) [2021-05-02 18:30:36,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:30:36,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 18:30:36,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:30:36,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:30:36,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:30:36,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:30:36,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:30:36,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:30:36,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:30:36,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:30:38,737 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1550 proven. 225 refuted. 0 times theorem prover too weak. 2450 trivial. 0 not checked. [2021-05-02 18:30:38,738 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225889408] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:30:38,738 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:30:38,738 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 18] total 70 [2021-05-02 18:30:38,738 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537051967] [2021-05-02 18:30:38,739 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-02 18:30:38,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:30:38,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-02 18:30:38,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=712, Invalid=4118, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:30:38,740 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 70 states, 70 states have (on average 2.1) internal successors, (147), 69 states have internal predecessors, (147), 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 18:30:47,044 WARN L205 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 45 [2021-05-02 18:30:50,718 WARN L205 SmtUtils]: Spent 606.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 42 [2021-05-02 18:30:57,381 WARN L205 SmtUtils]: Spent 794.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 42 [2021-05-02 18:31:03,969 WARN L205 SmtUtils]: Spent 918.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 42 [2021-05-02 18:31:11,966 WARN L205 SmtUtils]: Spent 899.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:31:16,156 WARN L205 SmtUtils]: Spent 327.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:31:19,414 WARN L205 SmtUtils]: Spent 407.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:31:22,936 WARN L205 SmtUtils]: Spent 575.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:31:26,439 WARN L205 SmtUtils]: Spent 473.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:31:28,297 WARN L205 SmtUtils]: Spent 338.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:31:29,980 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:31:31,674 WARN L205 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:31:32,764 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:31:33,776 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 42 [2021-05-02 18:31:35,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:31:35,718 INFO L93 Difference]: Finished difference Result 149 states and 152 transitions. [2021-05-02 18:31:35,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 18:31:35,720 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.1) internal successors, (147), 69 states have internal predecessors, (147), 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 141 [2021-05-02 18:31:35,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:31:35,721 INFO L225 Difference]: With dead ends: 149 [2021-05-02 18:31:35,721 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 18:31:35,722 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 141 SyntacticMatches, 2 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2430 ImplicationChecksByTransitivity, 56485.9ms TimeCoverageRelationStatistics Valid=1892, Invalid=17014, Unknown=0, NotChecked=0, Total=18906 [2021-05-02 18:31:35,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 18:31:35,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 147. [2021-05-02 18:31:35,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 3 states have call successors, (3), 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 18:31:35,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2021-05-02 18:31:35,724 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 141 [2021-05-02 18:31:35,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:31:35,725 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2021-05-02 18:31:35,725 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 2.1) internal successors, (147), 69 states have internal predecessors, (147), 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 18:31:35,725 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2021-05-02 18:31:35,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-02 18:31:35,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:31:35,726 INFO L523 BasicCegarLoop]: trace histogram [67, 51, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:31:35,933 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 18:31:35,933 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:31:35,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:31:35,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1706086192, now seen corresponding path program 49 times [2021-05-02 18:31:35,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:31:35,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591997643] [2021-05-02 18:31:35,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:31:35,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:31:38,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:31:38,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:31:38,568 INFO L134 CoverageAnalysis]: Checked inductivity of 4489 backedges. 1612 proven. 2652 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 18:31:38,568 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:31:38,568 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591997643] [2021-05-02 18:31:38,568 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [591997643] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:31:38,568 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784019922] [2021-05-02 18:31:38,568 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:31:38,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:31:38,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 18:31:38,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:31:39,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:39,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:31:39,254 INFO L134 CoverageAnalysis]: Checked inductivity of 4489 backedges. 1612 proven. 2652 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 18:31:39,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784019922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:31:39,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:31:39,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 18:31:39,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067005408] [2021-05-02 18:31:39,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 18:31:39,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:31:39,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 18:31:39,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:31:39,255 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 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 18:31:48,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:31:48,186 INFO L93 Difference]: Finished difference Result 149 states and 151 transitions. [2021-05-02 18:31:48,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 18:31:48,188 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 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 145 [2021-05-02 18:31:48,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:31:48,188 INFO L225 Difference]: With dead ends: 149 [2021-05-02 18:31:48,188 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 18:31:48,189 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 6419.9ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 18:31:48,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 18:31:48,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-05-02 18:31:48,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 3 states have call successors, (3), 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 18:31:48,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2021-05-02 18:31:48,191 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 145 [2021-05-02 18:31:48,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:31:48,191 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2021-05-02 18:31:48,192 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 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 18:31:48,192 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2021-05-02 18:31:48,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-02 18:31:48,192 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:31:48,193 INFO L523 BasicCegarLoop]: trace histogram [68, 52, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:31:48,408 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:31:48,409 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:31:48,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:31:48,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1822409650, now seen corresponding path program 50 times [2021-05-02 18:31:48,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:31:48,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088531117] [2021-05-02 18:31:48,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:31:48,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:31:51,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:31:51,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:31:51,114 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 1643 proven. 2756 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 18:31:51,114 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:31:51,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088531117] [2021-05-02 18:31:51,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2088531117] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:31:51,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624430926] [2021-05-02 18:31:51,114 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:31:51,179 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:31:51,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:31:51,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 145 conjunts are in the unsatisfiable core [2021-05-02 18:31:51,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:31:53,396 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:31:53,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624430926] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:31:53,396 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:31:53,397 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 71] total 73 [2021-05-02 18:31:53,397 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522320483] [2021-05-02 18:31:53,397 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-02 18:31:53,397 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:31:53,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-02 18:31:53,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=5060, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 18:31:53,398 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 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 18:32:05,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:32:05,022 INFO L93 Difference]: Finished difference Result 151 states and 153 transitions. [2021-05-02 18:32:05,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 18:32:05,023 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 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 147 [2021-05-02 18:32:05,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:32:05,024 INFO L225 Difference]: With dead ends: 151 [2021-05-02 18:32:05,024 INFO L226 Difference]: Without dead ends: 151 [2021-05-02 18:32:05,025 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 8760.5ms TimeCoverageRelationStatistics Valid=461, Invalid=15289, Unknown=0, NotChecked=0, Total=15750 [2021-05-02 18:32:05,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-02 18:32:05,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-05-02 18:32:05,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 3 states have call successors, (3), 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 18:32:05,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-02 18:32:05,028 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 147 [2021-05-02 18:32:05,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:32:05,028 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-02 18:32:05,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 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 18:32:05,028 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-02 18:32:05,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-02 18:32:05,029 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:32:05,029 INFO L523 BasicCegarLoop]: trace histogram [69, 53, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:32:05,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 18:32:05,245 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:32:05,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:32:05,245 INFO L82 PathProgramCache]: Analyzing trace with hash 317250028, now seen corresponding path program 51 times [2021-05-02 18:32:05,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:32:05,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630274370] [2021-05-02 18:32:05,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:32:05,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:32:08,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:32:08,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:32:08,363 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1674 proven. 2862 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 18:32:08,363 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:32:08,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630274370] [2021-05-02 18:32:08,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630274370] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:32:08,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952825078] [2021-05-02 18:32:08,363 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:32:09,264 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-05-02 18:32:09,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:32:09,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 18:32:09,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:32:15,070 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1749 proven. 256 refuted. 0 times theorem prover too weak. 2756 trivial. 0 not checked. [2021-05-02 18:32:15,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [952825078] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:32:15,070 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:32:15,070 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 19] total 74 [2021-05-02 18:32:15,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925886939] [2021-05-02 18:32:15,071 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-02 18:32:15,071 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:32:15,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-02 18:32:15,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=520, Invalid=4882, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 18:32:15,072 INFO L87 Difference]: Start difference. First operand 151 states and 153 transitions. Second operand has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 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 18:32:28,536 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2021-05-02 18:32:29,487 WARN L205 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:32:31,133 WARN L205 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:32:32,883 WARN L205 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:32:36,190 WARN L205 SmtUtils]: Spent 382.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:32:40,135 WARN L205 SmtUtils]: Spent 360.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:32:45,081 WARN L205 SmtUtils]: Spent 406.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:32:52,569 WARN L205 SmtUtils]: Spent 644.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:33:00,517 WARN L205 SmtUtils]: Spent 1.20 s on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:33:11,645 WARN L205 SmtUtils]: Spent 1.37 s on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:33:22,213 WARN L205 SmtUtils]: Spent 871.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:33:32,048 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:33:40,255 WARN L205 SmtUtils]: Spent 1.50 s on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:33:44,852 WARN L205 SmtUtils]: Spent 611.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:33:47,997 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:33:49,924 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:33:51,015 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2021-05-02 18:33:52,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:52,273 INFO L93 Difference]: Finished difference Result 157 states and 160 transitions. [2021-05-02 18:33:52,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-02 18:33:52,276 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 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 149 [2021-05-02 18:33:52,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:52,277 INFO L225 Difference]: With dead ends: 157 [2021-05-02 18:33:52,277 INFO L226 Difference]: Without dead ends: 157 [2021-05-02 18:33:52,278 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 146 SyntacticMatches, 5 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2696 ImplicationChecksByTransitivity, 95972.9ms TimeCoverageRelationStatistics Valid=1427, Invalid=19743, Unknown=0, NotChecked=0, Total=21170 [2021-05-02 18:33:52,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-02 18:33:52,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 155. [2021-05-02 18:33:52,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.02) internal successors, (153), 150 states have internal predecessors, (153), 3 states have call successors, (3), 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 18:33:52,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2021-05-02 18:33:52,280 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 149 [2021-05-02 18:33:52,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:52,280 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2021-05-02 18:33:52,280 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 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 18:33:52,280 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2021-05-02 18:33:52,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-02 18:33:52,281 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:52,281 INFO L523 BasicCegarLoop]: trace histogram [71, 54, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:52,487 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-02 18:33:52,487 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:52,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:52,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1555546951, now seen corresponding path program 52 times [2021-05-02 18:33:52,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:52,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121917569] [2021-05-02 18:33:52,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:52,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:57,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:57,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:57,563 INFO L134 CoverageAnalysis]: Checked inductivity of 5041 backedges. 1815 proven. 2970 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:33:57,563 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:57,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121917569] [2021-05-02 18:33:57,564 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121917569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:57,564 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878175387] [2021-05-02 18:33:57,564 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:57,633 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:33:57,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:57,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 112 conjunts are in the unsatisfiable core [2021-05-02 18:33:57,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:58,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:58,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:59,033 INFO L134 CoverageAnalysis]: Checked inductivity of 5041 backedges. 1815 proven. 2970 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:33:59,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878175387] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:59,034 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:59,034 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57] total 59 [2021-05-02 18:33:59,034 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250458193] [2021-05-02 18:33:59,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 18:33:59,034 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:59,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 18:33:59,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3252, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 18:33:59,035 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 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 18:34:16,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:16,155 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2021-05-02 18:34:16,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 18:34:16,157 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 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 153 [2021-05-02 18:34:16,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:16,158 INFO L225 Difference]: With dead ends: 157 [2021-05-02 18:34:16,158 INFO L226 Difference]: Without dead ends: 157 [2021-05-02 18:34:16,158 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1490 ImplicationChecksByTransitivity, 11919.4ms TimeCoverageRelationStatistics Valid=445, Invalid=12437, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 18:34:16,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-02 18:34:16,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2021-05-02 18:34:16,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 3 states have call successors, (3), 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 18:34:16,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-02 18:34:16,160 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 153 [2021-05-02 18:34:16,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:16,160 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-02 18:34:16,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 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 18:34:16,160 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-02 18:34:16,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-02 18:34:16,161 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:16,161 INFO L523 BasicCegarLoop]: trace histogram [72, 55, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:16,366 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:34:16,367 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:16,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:16,367 INFO L82 PathProgramCache]: Analyzing trace with hash -290508187, now seen corresponding path program 53 times [2021-05-02 18:34:16,367 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:16,367 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323527608] [2021-05-02 18:34:16,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:16,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:20,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:20,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:20,685 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 1848 proven. 3080 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:34:20,685 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:20,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323527608] [2021-05-02 18:34:20,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323527608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:20,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791812755] [2021-05-02 18:34:20,686 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true