/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:51:21,286 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:51:21,287 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:51:21,326 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 18:51:21,327 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 18:51:21,331 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 18:51:21,334 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 18:51:21,340 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 18:51:21,343 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 18:51:21,349 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 18:51:21,350 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 18:51:21,351 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 18:51:21,351 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:51:21,354 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:51:21,355 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:51:21,357 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:51:21,360 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:51:21,361 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:51:21,364 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:51:21,369 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:51:21,370 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:51:21,372 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:51:21,373 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:51:21,375 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:51:21,379 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:51:21,391 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:51:21,391 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:51:21,392 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:51:21,393 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:51:21,408 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:51:21,409 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:51:21,412 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:51:21,412 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:51:21,412 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:51:21,412 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:51:21,412 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:51:21,413 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:51:21,413 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:51:21,413 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:51:21,414 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:51:21,414 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:51:21,414 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:51:21,414 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:51:21,414 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:51:21,415 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:51:21,415 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:51:21,415 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:51:21,415 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:51:21,415 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:51:21,415 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:51:21,417 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:51:21,417 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:51:21,735 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:51:21,759 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:51:21,762 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:51:21,763 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:51:21,764 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:51:21,765 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c [2021-05-02 18:51:21,838 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9633ee032/f26fa23112fc409b8ffe6a9fb27251cd/FLAGabfbd9e55 [2021-05-02 18:51:22,233 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:51:22,234 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c [2021-05-02 18:51:22,239 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9633ee032/f26fa23112fc409b8ffe6a9fb27251cd/FLAGabfbd9e55 [2021-05-02 18:51:22,628 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9633ee032/f26fa23112fc409b8ffe6a9fb27251cd [2021-05-02 18:51:22,635 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:51:22,640 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:51:22,642 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:51:22,643 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:51:22,647 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:51:22,648 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:51:22" (1/1) ... [2021-05-02 18:51:22,650 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7cbc7d02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:51:22, skipping insertion in model container [2021-05-02 18:51:22,650 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:51:22" (1/1) ... [2021-05-02 18:51:22,657 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:51:22,670 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:51:22,784 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c[318,331] [2021-05-02 18:51:22,796 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:51:22,806 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:51:22,816 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c[318,331] [2021-05-02 18:51:22,819 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:51:22,832 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:51:22,833 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:51:22 WrapperNode [2021-05-02 18:51:22,833 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:51:22,834 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:51:22,835 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:51:22,835 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:51:22,847 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:51:22" (1/1) ... [2021-05-02 18:51:22,847 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:51:22" (1/1) ... [2021-05-02 18:51:22,853 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:51:22" (1/1) ... [2021-05-02 18:51:22,853 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:51:22" (1/1) ... [2021-05-02 18:51:22,858 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:51:22" (1/1) ... [2021-05-02 18:51:22,906 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:51:22" (1/1) ... [2021-05-02 18:51:22,907 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:51:22" (1/1) ... [2021-05-02 18:51:22,908 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:51:22,913 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:51:22,913 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:51:22,914 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:51:22,915 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:51:22" (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 18:51:22,995 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:51:22,995 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:51:22,995 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:51:22,995 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:51:22,996 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:51:22,996 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:51:22,996 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:51:22,996 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:51:22,996 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:51:22,996 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:51:22,996 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:51:22,997 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:51:22,997 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:51:22,997 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:51:22,997 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:51:22,997 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:51:22,997 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:51:23,173 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:51:23,174 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:51:23,175 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:51:23 BoogieIcfgContainer [2021-05-02 18:51:23,175 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:51:23,176 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:51:23,176 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:51:23,176 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:51:23,178 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:51:23" (1/1) ... [2021-05-02 18:51:23,192 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:51:23 BasicIcfg [2021-05-02 18:51:23,192 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:51:23,193 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:51:23,193 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:51:23,195 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:51:23,196 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:51:22" (1/4) ... [2021-05-02 18:51:23,196 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f5f7ce4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:51:23, skipping insertion in model container [2021-05-02 18:51:23,196 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:51:22" (2/4) ... [2021-05-02 18:51:23,197 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f5f7ce4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:51:23, skipping insertion in model container [2021-05-02 18:51:23,197 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:51:23" (3/4) ... [2021-05-02 18:51:23,197 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f5f7ce4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:51:23, skipping insertion in model container [2021-05-02 18:51:23,197 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:51:23" (4/4) ... [2021-05-02 18:51:23,198 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_8.cJordan [2021-05-02 18:51:23,202 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:51:23,205 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:51:23,237 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:51:23,262 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:51:23,263 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:51:23,263 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:51:23,263 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:51:23,263 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:51:23,263 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:51:23,263 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:51:23,263 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:51:23,281 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:51:23,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:51:23,288 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:23,289 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:23,290 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:23,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:23,295 INFO L82 PathProgramCache]: Analyzing trace with hash 447419557, now seen corresponding path program 1 times [2021-05-02 18:51:23,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:23,303 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [415970103] [2021-05-02 18:51:23,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:23,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:23,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:23,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:23,607 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 18:51:23,608 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:23,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [415970103] [2021-05-02 18:51:23,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [415970103] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:51:23,609 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:51:23,609 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:51:23,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874025815] [2021-05-02 18:51:23,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:51:23,617 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:23,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:51:23,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:51:23,634 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:23,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:23,703 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-05-02 18:51:23,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:51:23,705 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 18:51:23,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:23,712 INFO L225 Difference]: With dead ends: 21 [2021-05-02 18:51:23,712 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 18:51:23,714 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 94.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:51:23,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 18:51:23,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 18:51:23,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:23,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 18:51:23,743 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 18:51:23,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:23,744 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 18:51:23,744 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 18:51:23,744 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 18:51:23,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:51:23,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:23,746 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:23,746 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:51:23,746 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:23,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:23,747 INFO L82 PathProgramCache]: Analyzing trace with hash 448343078, now seen corresponding path program 1 times [2021-05-02 18:51:23,747 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:23,748 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296913110] [2021-05-02 18:51:23,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:23,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:23,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:23,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:23,985 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 18:51:23,986 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:23,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296913110] [2021-05-02 18:51:23,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296913110] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:51:23,988 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:51:23,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:51:23,989 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849017730] [2021-05-02 18:51:23,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:51:23,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:23,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:51:23,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:51:23,996 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:24,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:24,111 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-05-02 18:51:24,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:51:24,117 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 18:51:24,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:24,118 INFO L225 Difference]: With dead ends: 17 [2021-05-02 18:51:24,118 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 18:51:24,119 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 137.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:51:24,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 18:51:24,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 18:51:24,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:24,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 18:51:24,123 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-02 18:51:24,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:24,123 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 18:51:24,123 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 18:51:24,123 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 18:51:24,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 18:51:24,124 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:24,124 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:24,124 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:51:24,124 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:24,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:24,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1516694440, now seen corresponding path program 1 times [2021-05-02 18:51:24,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:24,125 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817156471] [2021-05-02 18:51:24,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:24,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:24,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:24,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:24,301 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 18:51:24,302 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:24,302 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817156471] [2021-05-02 18:51:24,302 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817156471] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:24,302 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170510004] [2021-05-02 18:51:24,302 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 18:51:24,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:24,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:51:24,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:24,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:24,566 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 18:51:24,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170510004] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:24,567 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:24,567 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 7 [2021-05-02 18:51:24,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823667978] [2021-05-02 18:51:24,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:51:24,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:24,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:51:24,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:51:24,569 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:24,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:24,699 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-02 18:51:24,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:51:24,700 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 18:51:24,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:24,702 INFO L225 Difference]: With dead ends: 20 [2021-05-02 18:51:24,702 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 18:51:24,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 160.7ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:51:24,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 18:51:24,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 18:51:24,710 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 18:51:24,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 18:51:24,711 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 18:51:24,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:24,711 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 18:51:24,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:24,712 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 18:51:24,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:51:24,713 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:24,713 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:24,936 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 18:51:24,937 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:24,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:24,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1545148698, now seen corresponding path program 2 times [2021-05-02 18:51:24,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:24,938 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812871351] [2021-05-02 18:51:24,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:24,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:25,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:25,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:25,110 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:51:25,110 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:25,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812871351] [2021-05-02 18:51:25,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812871351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:25,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227167306] [2021-05-02 18:51:25,111 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 18:51:25,164 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:51:25,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:25,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 18:51:25,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:25,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:25,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:51:25,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227167306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:25,263 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:25,263 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 9 [2021-05-02 18:51:25,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925419530] [2021-05-02 18:51:25,263 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:51:25,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:25,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:51:25,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:51:25,264 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:25,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:25,390 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2021-05-02 18:51:25,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:51:25,391 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 18:51:25,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:25,392 INFO L225 Difference]: With dead ends: 23 [2021-05-02 18:51:25,392 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 18:51:25,392 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 171.4ms TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:51:25,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 18:51:25,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 18:51:25,394 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 18:51:25,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 18:51:25,395 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-05-02 18:51:25,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:25,396 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 18:51:25,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:25,396 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 18:51:25,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 18:51:25,396 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:25,397 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:25,619 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:25,620 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:25,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:25,620 INFO L82 PathProgramCache]: Analyzing trace with hash 1177575832, now seen corresponding path program 3 times [2021-05-02 18:51:25,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:25,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606795298] [2021-05-02 18:51:25,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:25,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:25,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:25,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:25,787 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:51:25,788 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:25,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606795298] [2021-05-02 18:51:25,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [606795298] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:25,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909206556] [2021-05-02 18:51:25,791 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:51:25,844 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:51:25,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:25,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 18:51:25,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:25,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:25,993 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:51:25,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909206556] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:51:25,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:51:25,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2021-05-02 18:51:25,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399741487] [2021-05-02 18:51:25,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 18:51:25,999 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:25,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 18:51:26,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:51:26,000 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 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 18:51:26,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:26,054 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-05-02 18:51:26,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:51:26,055 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 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 20 [2021-05-02 18:51:26,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:26,057 INFO L225 Difference]: With dead ends: 27 [2021-05-02 18:51:26,057 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 18:51:26,059 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 156.7ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:51:26,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 18:51:26,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-05-02 18:51:26,068 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 18:51:26,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 18:51:26,069 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2021-05-02 18:51:26,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:26,070 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 18:51:26,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 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 18:51:26,071 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 18:51:26,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:51:26,072 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:26,072 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:26,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:26,287 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:26,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:26,287 INFO L82 PathProgramCache]: Analyzing trace with hash -1775806875, now seen corresponding path program 1 times [2021-05-02 18:51:26,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:26,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822235024] [2021-05-02 18:51:26,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:26,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:26,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:26,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:26,385 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:51:26,385 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:26,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822235024] [2021-05-02 18:51:26,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1822235024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:26,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [750836144] [2021-05-02 18:51:26,386 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 18:51:26,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:26,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 18:51:26,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:26,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:26,532 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:51:26,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [750836144] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:26,532 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:26,533 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 18:51:26,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512333413] [2021-05-02 18:51:26,534 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:51:26,535 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:26,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:51:26,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:51:26,536 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:26,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:26,711 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-05-02 18:51:26,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:51:26,712 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 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 18:51:26,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:26,713 INFO L225 Difference]: With dead ends: 28 [2021-05-02 18:51:26,713 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 18:51:26,713 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 164.4ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:51:26,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 18:51:26,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 18:51:26,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:26,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-05-02 18:51:26,716 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2021-05-02 18:51:26,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:26,716 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-05-02 18:51:26,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:26,717 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-05-02 18:51:26,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 18:51:26,717 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:26,717 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:26,932 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:26,933 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:26,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:26,934 INFO L82 PathProgramCache]: Analyzing trace with hash 503481239, now seen corresponding path program 2 times [2021-05-02 18:51:26,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:26,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805347931] [2021-05-02 18:51:26,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:26,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:27,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:27,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:27,054 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:51:27,055 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:27,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805347931] [2021-05-02 18:51:27,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805347931] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:27,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147185699] [2021-05-02 18:51:27,056 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 18:51:27,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:51:27,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:27,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 18:51:27,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:27,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:27,188 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:51:27,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147185699] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:27,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:27,189 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 18:51:27,189 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597227528] [2021-05-02 18:51:27,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:51:27,191 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:27,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:51:27,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:51:27,192 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:27,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:27,420 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2021-05-02 18:51:27,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:51:27,420 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 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 26 [2021-05-02 18:51:27,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:27,421 INFO L225 Difference]: With dead ends: 31 [2021-05-02 18:51:27,421 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 18:51:27,421 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 196.3ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:51:27,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 18:51:27,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2021-05-02 18:51:27,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:27,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-05-02 18:51:27,425 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2021-05-02 18:51:27,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:27,425 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-05-02 18:51:27,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:27,425 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-05-02 18:51:27,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:51:27,426 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:27,426 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:27,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 18:51:27,637 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:27,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:27,637 INFO L82 PathProgramCache]: Analyzing trace with hash -657264347, now seen corresponding path program 3 times [2021-05-02 18:51:27,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:27,638 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018038007] [2021-05-02 18:51:27,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:27,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:27,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:27,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:27,756 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:51:27,757 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:27,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018038007] [2021-05-02 18:51:27,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1018038007] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:27,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297362433] [2021-05-02 18:51:27,758 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 18:51:27,854 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 18:51:27,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:27,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:51:27,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:28,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:28,042 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:51:28,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297362433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:28,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:28,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 14 [2021-05-02 18:51:28,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169954184] [2021-05-02 18:51:28,043 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:51:28,043 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:28,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:51:28,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:51:28,045 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 13 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:28,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:28,828 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-05-02 18:51:28,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 18:51:28,828 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 13 states have internal predecessors, (36), 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 18:51:28,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:28,830 INFO L225 Difference]: With dead ends: 42 [2021-05-02 18:51:28,830 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 18:51:28,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 730.4ms TimeCoverageRelationStatistics Valid=146, Invalid=504, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:51:28,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 18:51:28,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-02 18:51:28,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:28,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-02 18:51:28,837 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 29 [2021-05-02 18:51:28,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:28,837 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-02 18:51:28,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 13 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:28,837 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-02 18:51:28,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 18:51:28,838 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:28,838 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:29,049 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:29,049 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:29,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:29,050 INFO L82 PathProgramCache]: Analyzing trace with hash -1671627528, now seen corresponding path program 4 times [2021-05-02 18:51:29,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:29,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539578930] [2021-05-02 18:51:29,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:29,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:29,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:29,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:29,206 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:51:29,206 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:29,206 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539578930] [2021-05-02 18:51:29,206 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1539578930] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:29,206 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64287982] [2021-05-02 18:51:29,207 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 18:51:29,269 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:51:29,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:29,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 18:51:29,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:29,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:29,367 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:51:29,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64287982] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:29,367 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:29,367 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 18:51:29,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173361177] [2021-05-02 18:51:29,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:51:29,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:29,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:51:29,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:51:29,369 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:29,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:29,755 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2021-05-02 18:51:29,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:51:29,755 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 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 38 [2021-05-02 18:51:29,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:29,756 INFO L225 Difference]: With dead ends: 44 [2021-05-02 18:51:29,756 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 18:51:29,757 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 302.3ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:51:29,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 18:51:29,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-05-02 18:51:29,769 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 18:51:29,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-02 18:51:29,773 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 38 [2021-05-02 18:51:29,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:29,773 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-02 18:51:29,773 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:29,774 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-02 18:51:29,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 18:51:29,774 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:29,774 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:29,997 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:29,997 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:29,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:29,998 INFO L82 PathProgramCache]: Analyzing trace with hash -1247836794, now seen corresponding path program 5 times [2021-05-02 18:51:29,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:29,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301117673] [2021-05-02 18:51:29,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:30,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:30,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:30,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:30,153 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 43 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:51:30,153 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:30,153 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301117673] [2021-05-02 18:51:30,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301117673] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:30,153 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542365252] [2021-05-02 18:51:30,153 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 18:51:30,269 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2021-05-02 18:51:30,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:30,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 18:51:30,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:30,399 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 43 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:51:30,399 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542365252] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:30,400 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:30,400 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2021-05-02 18:51:30,400 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053081211] [2021-05-02 18:51:30,400 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:51:30,400 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:30,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:51:30,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:51:30,401 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 13 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:30,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:30,858 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2021-05-02 18:51:30,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:51:30,858 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 13 states have internal predecessors, (40), 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 18:51:30,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:30,859 INFO L225 Difference]: With dead ends: 47 [2021-05-02 18:51:30,859 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 18:51:30,860 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 399.9ms TimeCoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:51:30,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 18:51:30,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-02 18:51:30,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:30,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2021-05-02 18:51:30,862 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 41 [2021-05-02 18:51:30,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:30,863 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2021-05-02 18:51:30,863 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 13 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:30,863 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2021-05-02 18:51:30,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 18:51:30,864 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:30,864 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:31,067 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:51:31,067 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:31,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:31,068 INFO L82 PathProgramCache]: Analyzing trace with hash 993036856, now seen corresponding path program 6 times [2021-05-02 18:51:31,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:31,068 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611678711] [2021-05-02 18:51:31,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:31,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:31,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:31,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:31,284 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 48 proven. 126 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:51:31,284 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:31,285 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611678711] [2021-05-02 18:51:31,285 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611678711] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:31,285 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2037419594] [2021-05-02 18:51:31,285 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 18:51:31,415 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-02 18:51:31,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:31,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 18:51:31,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:31,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:31,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:31,710 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 70 proven. 19 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2021-05-02 18:51:31,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2037419594] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:31,710 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:31,710 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 19 [2021-05-02 18:51:31,711 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712403705] [2021-05-02 18:51:31,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 18:51:31,711 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:31,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 18:51:31,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:51:31,712 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 19 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 18 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 18:51:33,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:33,019 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2021-05-02 18:51:33,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 18:51:33,020 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 18 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 44 [2021-05-02 18:51:33,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:33,020 INFO L225 Difference]: With dead ends: 57 [2021-05-02 18:51:33,021 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 18:51:33,021 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 1130.1ms TimeCoverageRelationStatistics Valid=219, Invalid=1041, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:51:33,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 18:51:33,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2021-05-02 18:51:33,023 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 18:51:33,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-02 18:51:33,024 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 44 [2021-05-02 18:51:33,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:33,024 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-02 18:51:33,024 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 18 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 18:51:33,025 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-02 18:51:33,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 18:51:33,025 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:33,025 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:33,228 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:33,228 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:33,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:33,229 INFO L82 PathProgramCache]: Analyzing trace with hash 2010530949, now seen corresponding path program 7 times [2021-05-02 18:51:33,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:33,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995041214] [2021-05-02 18:51:33,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:33,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:33,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:33,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:33,477 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 93 proven. 187 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:51:33,477 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:33,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995041214] [2021-05-02 18:51:33,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [995041214] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:33,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248110376] [2021-05-02 18:51:33,477 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 18:51:33,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:33,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 18:51:33,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:33,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:33,698 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 93 proven. 187 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:51:33,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1248110376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:33,699 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:33,699 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 18:51:33,699 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862073152] [2021-05-02 18:51:33,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:51:33,699 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:33,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:51:33,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:51:33,700 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:34,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:34,260 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2021-05-02 18:51:34,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 18:51:34,261 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 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 18:51:34,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:34,262 INFO L225 Difference]: With dead ends: 59 [2021-05-02 18:51:34,262 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 18:51:34,262 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 515.0ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:51:34,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 18:51:34,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-02 18:51:34,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 53 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:34,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2021-05-02 18:51:34,265 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2021-05-02 18:51:34,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:34,266 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2021-05-02 18:51:34,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:34,266 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2021-05-02 18:51:34,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 18:51:34,267 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:34,267 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:34,468 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:34,469 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:34,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:34,470 INFO L82 PathProgramCache]: Analyzing trace with hash 253480503, now seen corresponding path program 8 times [2021-05-02 18:51:34,470 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:34,470 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843036761] [2021-05-02 18:51:34,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:34,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:34,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:34,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:34,704 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 101 proven. 222 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:51:34,704 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:34,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843036761] [2021-05-02 18:51:34,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843036761] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:34,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905332778] [2021-05-02 18:51:34,705 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 18:51:34,760 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:51:34,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:34,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 18:51:34,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:34,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:34,893 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 101 proven. 222 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:51:34,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1905332778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:34,894 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:34,894 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 18:51:34,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711792842] [2021-05-02 18:51:34,894 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:51:34,894 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:34,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:51:34,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:51:34,895 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:35,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:35,604 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2021-05-02 18:51:35,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:51:35,605 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 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 56 [2021-05-02 18:51:35,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:35,605 INFO L225 Difference]: With dead ends: 62 [2021-05-02 18:51:35,606 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 18:51:35,606 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 571.9ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:51:35,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 18:51:35,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 18:51:35,609 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 18:51:35,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 18:51:35,609 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 56 [2021-05-02 18:51:35,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:35,609 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 18:51:35,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:35,610 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 18:51:35,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 18:51:35,610 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:35,610 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:35,811 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 18:51:35,811 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:35,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:35,812 INFO L82 PathProgramCache]: Analyzing trace with hash -1269919931, now seen corresponding path program 9 times [2021-05-02 18:51:35,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:35,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271631345] [2021-05-02 18:51:35,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:35,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:36,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:36,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:36,061 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 109 proven. 260 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:51:36,061 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:36,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271631345] [2021-05-02 18:51:36,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271631345] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:36,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70470095] [2021-05-02 18:51:36,062 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 18:51:36,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-02 18:51:36,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:36,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 18:51:36,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:36,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:36,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:36,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:36,539 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 15 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-05-02 18:51:36,539 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70470095] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:36,539 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:36,539 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9] total 24 [2021-05-02 18:51:36,540 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189350078] [2021-05-02 18:51:36,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:51:36,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:36,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:51:36,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:51:36,541 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 24 states, 24 states have (on average 2.8333333333333335) internal successors, (68), 23 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:38,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:38,356 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2021-05-02 18:51:38,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 18:51:38,356 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.8333333333333335) internal successors, (68), 23 states have internal predecessors, (68), 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 18:51:38,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:38,357 INFO L225 Difference]: With dead ends: 72 [2021-05-02 18:51:38,357 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 18:51:38,358 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 1591.5ms TimeCoverageRelationStatistics Valid=292, Invalid=1778, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:51:38,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 18:51:38,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2021-05-02 18:51:38,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 65 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:38,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2021-05-02 18:51:38,361 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 59 [2021-05-02 18:51:38,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:38,361 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2021-05-02 18:51:38,361 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.8333333333333335) internal successors, (68), 23 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:38,362 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2021-05-02 18:51:38,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 18:51:38,362 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:38,362 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:38,576 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:51:38,577 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:38,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:38,577 INFO L82 PathProgramCache]: Analyzing trace with hash -597919016, now seen corresponding path program 10 times [2021-05-02 18:51:38,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:38,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447883856] [2021-05-02 18:51:38,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:38,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:38,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:38,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:38,879 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 172 proven. 345 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:51:38,879 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:38,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447883856] [2021-05-02 18:51:38,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [447883856] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:38,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353508672] [2021-05-02 18:51:38,879 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 18:51:38,922 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:51:38,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:38,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 18:51:38,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:39,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:39,077 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 172 proven. 345 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:51:39,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353508672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:39,078 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:39,078 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 18:51:39,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16224886] [2021-05-02 18:51:39,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:51:39,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:39,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:51:39,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:51:39,079 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:39,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:39,934 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2021-05-02 18:51:39,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:51:39,935 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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 68 [2021-05-02 18:51:39,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:39,936 INFO L225 Difference]: With dead ends: 74 [2021-05-02 18:51:39,936 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 18:51:39,936 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 666.0ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:51:39,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 18:51:39,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-02 18:51:39,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:39,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2021-05-02 18:51:39,940 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 68 [2021-05-02 18:51:39,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:39,940 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2021-05-02 18:51:39,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:39,940 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2021-05-02 18:51:39,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 18:51:39,941 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:39,941 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:40,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:51:40,153 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:40,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:40,153 INFO L82 PathProgramCache]: Analyzing trace with hash 429922022, now seen corresponding path program 11 times [2021-05-02 18:51:40,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:40,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607193675] [2021-05-02 18:51:40,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:40,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:40,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:40,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:40,470 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 183 proven. 392 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:51:40,470 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:40,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607193675] [2021-05-02 18:51:40,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607193675] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:40,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282459249] [2021-05-02 18:51:40,471 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 18:51:41,423 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2021-05-02 18:51:41,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:41,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 18:51:41,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:41,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:41,732 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 183 proven. 392 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:51:41,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282459249] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:41,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:41,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 18:51:41,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078281218] [2021-05-02 18:51:41,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 18:51:41,733 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:41,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 18:51:41,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 18:51:41,734 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:42,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:42,733 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2021-05-02 18:51:42,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 18:51:42,734 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 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 71 [2021-05-02 18:51:42,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:42,735 INFO L225 Difference]: With dead ends: 77 [2021-05-02 18:51:42,735 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 18:51:42,735 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 57 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 907.4ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:51:42,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 18:51:42,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2021-05-02 18:51:42,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0422535211267605) internal successors, (74), 71 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:42,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2021-05-02 18:51:42,750 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 71 [2021-05-02 18:51:42,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:42,750 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2021-05-02 18:51:42,750 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:42,750 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2021-05-02 18:51:42,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 18:51:42,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:42,751 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:42,959 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:42,960 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:42,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:42,960 INFO L82 PathProgramCache]: Analyzing trace with hash 2020431896, now seen corresponding path program 12 times [2021-05-02 18:51:42,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:42,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018537621] [2021-05-02 18:51:42,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:42,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:43,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:43,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:43,300 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 194 proven. 442 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:51:43,300 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:43,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018537621] [2021-05-02 18:51:43,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018537621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:43,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687912830] [2021-05-02 18:51:43,300 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 18:51:43,663 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 18:51:43,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:43,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 18:51:43,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:43,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:43,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:43,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:44,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:44,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:44,602 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 285 proven. 116 refuted. 0 times theorem prover too weak. 250 trivial. 0 not checked. [2021-05-02 18:51:44,603 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1687912830] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:44,603 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:44,603 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 15] total 34 [2021-05-02 18:51:44,603 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793772706] [2021-05-02 18:51:44,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 18:51:44,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:44,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 18:51:44,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1005, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:51:44,604 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 34 states, 34 states have (on average 2.7058823529411766) internal successors, (92), 33 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:47,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:47,688 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2021-05-02 18:51:47,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:51:47,689 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.7058823529411766) internal successors, (92), 33 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-02 18:51:47,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:47,689 INFO L225 Difference]: With dead ends: 94 [2021-05-02 18:51:47,689 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 18:51:47,690 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 61 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 3109.7ms TimeCoverageRelationStatistics Valid=646, Invalid=3644, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:51:47,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 18:51:47,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 87. [2021-05-02 18:51:47,693 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 18:51:47,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-02 18:51:47,693 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 74 [2021-05-02 18:51:47,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:47,693 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-02 18:51:47,694 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.7058823529411766) internal successors, (92), 33 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:47,694 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-02 18:51:47,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 18:51:47,694 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:47,694 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 19, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:47,897 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 18:51:47,897 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:47,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:47,898 INFO L82 PathProgramCache]: Analyzing trace with hash 812787256, now seen corresponding path program 13 times [2021-05-02 18:51:47,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:47,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1384676392] [2021-05-02 18:51:47,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:47,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:48,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:48,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:48,249 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 334 proven. 551 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:51:48,249 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:48,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1384676392] [2021-05-02 18:51:48,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1384676392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:48,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [715068650] [2021-05-02 18:51:48,249 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 18:51:48,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:48,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 18:51:48,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:48,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:48,485 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 334 proven. 551 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:51:48,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [715068650] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:48,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:48,485 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 18:51:48,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197384942] [2021-05-02 18:51:48,487 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:51:48,487 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:48,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:51:48,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:51:48,488 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:49,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:49,601 INFO L93 Difference]: Finished difference Result 91 states and 93 transitions. [2021-05-02 18:51:49,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 18:51:49,601 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-05-02 18:51:49,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:49,602 INFO L225 Difference]: With dead ends: 91 [2021-05-02 18:51:49,602 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 18:51:49,603 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 872.4ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:51:49,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 18:51:49,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2021-05-02 18:51:49,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.035294117647059) internal successors, (88), 85 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:49,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2021-05-02 18:51:49,606 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 86 [2021-05-02 18:51:49,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:49,606 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2021-05-02 18:51:49,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:49,606 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2021-05-02 18:51:49,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 18:51:49,607 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:49,607 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:49,821 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:51:49,821 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:49,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:49,821 INFO L82 PathProgramCache]: Analyzing trace with hash -707257658, now seen corresponding path program 14 times [2021-05-02 18:51:49,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:49,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843531847] [2021-05-02 18:51:49,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:49,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:50,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:50,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:50,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 610 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:51:50,256 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:50,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843531847] [2021-05-02 18:51:50,256 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843531847] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:50,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909132229] [2021-05-02 18:51:50,256 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 18:51:50,302 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:51:50,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:50,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 18:51:50,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:50,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:50,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 610 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:51:50,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909132229] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:50,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:50,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 18:51:50,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016196378] [2021-05-02 18:51:50,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:51:50,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:50,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:51:50,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:51:50,466 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:51,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:51,677 INFO L93 Difference]: Finished difference Result 94 states and 96 transitions. [2021-05-02 18:51:51,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 18:51:51,683 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 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 18:51:51,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:51,683 INFO L225 Difference]: With dead ends: 94 [2021-05-02 18:51:51,684 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 18:51:51,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 984.8ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:51:51,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 18:51:51,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-05-02 18:51:51,686 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 18:51:51,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-05-02 18:51:51,687 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2021-05-02 18:51:51,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:51,687 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-05-02 18:51:51,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:51,688 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-05-02 18:51:51,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 18:51:51,688 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:51,688 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:51,905 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:51,905 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:51,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:51,905 INFO L82 PathProgramCache]: Analyzing trace with hash 1769878392, now seen corresponding path program 15 times [2021-05-02 18:51:51,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:51,905 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870868556] [2021-05-02 18:51:51,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:51,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:52,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:52,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:52,398 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 368 proven. 672 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:51:52,398 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:52,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870868556] [2021-05-02 18:51:52,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870868556] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:52,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925373221] [2021-05-02 18:51:52,398 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 18:51:52,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-02 18:51:52,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:52,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 18:51:52,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:52,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:53,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:53,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 413 proven. 57 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2021-05-02 18:51:53,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925373221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:53,587 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:53,587 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 12] total 35 [2021-05-02 18:51:53,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307406232] [2021-05-02 18:51:53,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 18:51:53,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:53,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 18:51:53,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 18:51:53,589 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 34 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:57,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:57,099 INFO L93 Difference]: Finished difference Result 105 states and 107 transitions. [2021-05-02 18:51:57,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 18:51:57,099 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 34 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-05-02 18:51:57,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:57,100 INFO L225 Difference]: With dead ends: 105 [2021-05-02 18:51:57,100 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 18:51:57,101 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 80 SyntacticMatches, 6 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 3313.3ms TimeCoverageRelationStatistics Valid=447, Invalid=4109, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 18:51:57,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 18:51:57,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 103. [2021-05-02 18:51:57,103 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 18:51:57,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 18:51:57,104 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 92 [2021-05-02 18:51:57,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:57,104 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 18:51:57,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 34 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:57,104 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 18:51:57,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 18:51:57,105 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:57,105 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 23, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:57,309 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:57,309 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:57,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:57,309 INFO L82 PathProgramCache]: Analyzing trace with hash -189754555, now seen corresponding path program 16 times [2021-05-02 18:51:57,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:57,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906287561] [2021-05-02 18:51:57,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:57,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:57,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:51:57,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:51:57,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:51:57,751 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:51:57,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906287561] [2021-05-02 18:51:57,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906287561] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:57,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210465055] [2021-05-02 18:51:57,751 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 18:51:57,810 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:51:57,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:51:57,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 18:51:57,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:51:57,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:51:58,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:51:58,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210465055] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:51:58,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:51:58,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 18:51:58,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076520767] [2021-05-02 18:51:58,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 18:51:58,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:51:58,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 18:51:58,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:51:58,023 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:59,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:51:59,615 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2021-05-02 18:51:59,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 18:51:59,616 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 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 18:51:59,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:51:59,616 INFO L225 Difference]: With dead ends: 107 [2021-05-02 18:51:59,616 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 18:51:59,617 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1155.0ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 18:51:59,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 18:51:59,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-02 18:51:59,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0297029702970297) internal successors, (104), 101 states have internal predecessors, (104), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:59,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2021-05-02 18:51:59,620 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 101 [2021-05-02 18:51:59,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:51:59,620 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2021-05-02 18:51:59,620 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:51:59,620 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2021-05-02 18:51:59,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 18:51:59,620 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:51:59,621 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:51:59,836 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:51:59,837 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:51:59,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:51:59,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1594700023, now seen corresponding path program 17 times [2021-05-02 18:51:59,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:51:59,837 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908641963] [2021-05-02 18:51:59,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:51:59,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:00,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:00,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:00,398 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:52:00,398 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:00,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908641963] [2021-05-02 18:52:00,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908641963] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:00,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1570521725] [2021-05-02 18:52:00,398 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 18:52:29,292 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 32 check-sat command(s) [2021-05-02 18:52:29,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:29,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 18:52:29,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:29,956 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:52:29,956 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1570521725] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:29,956 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:29,956 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 30 [2021-05-02 18:52:29,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149947109] [2021-05-02 18:52:29,957 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:52:29,957 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:29,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:52:29,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:52:29,958 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand has 30 states, 30 states have (on average 2.933333333333333) internal successors, (88), 29 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:31,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:31,883 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2021-05-02 18:52:31,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 18:52:31,884 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.933333333333333) internal successors, (88), 29 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-02 18:52:31,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:31,885 INFO L225 Difference]: With dead ends: 110 [2021-05-02 18:52:31,885 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 18:52:31,886 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 81 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 1882.4ms TimeCoverageRelationStatistics Valid=216, Invalid=2864, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:52:31,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 18:52:31,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-05-02 18:52:31,888 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 18:52:31,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-02 18:52:31,889 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 104 [2021-05-02 18:52:31,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:31,890 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-02 18:52:31,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.933333333333333) internal successors, (88), 29 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:31,890 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-02 18:52:31,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 18:52:31,890 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:31,891 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:32,097 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 18:52:32,097 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:32,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:32,097 INFO L82 PathProgramCache]: Analyzing trace with hash -824156667, now seen corresponding path program 18 times [2021-05-02 18:52:32,098 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:32,098 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297250283] [2021-05-02 18:52:32,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:32,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:32,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:32,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:32,779 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 513 proven. 950 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:52:32,779 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:32,779 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297250283] [2021-05-02 18:52:32,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297250283] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:32,779 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41664082] [2021-05-02 18:52:32,780 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 18:52:34,667 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 18:52:34,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:34,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 18:52:34,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:34,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:35,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:35,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:37,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:37,060 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 597 proven. 605 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-05-02 18:52:37,060 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41664082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:37,060 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:37,060 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 56 [2021-05-02 18:52:37,060 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561704359] [2021-05-02 18:52:37,061 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 18:52:37,061 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:37,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 18:52:37,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=2820, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:52:37,062 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 56 states, 56 states have (on average 2.5535714285714284) internal successors, (143), 55 states have internal predecessors, (143), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:43,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:43,552 INFO L93 Difference]: Finished difference Result 141 states and 150 transitions. [2021-05-02 18:52:43,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 18:52:43,552 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.5535714285714284) internal successors, (143), 55 states have internal predecessors, (143), 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 18:52:43,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:43,554 INFO L225 Difference]: With dead ends: 141 [2021-05-02 18:52:43,554 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 18:52:43,555 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 80 SyntacticMatches, 4 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2066 ImplicationChecksByTransitivity, 7010.4ms TimeCoverageRelationStatistics Valid=1551, Invalid=10005, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 18:52:43,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 18:52:43,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 118. [2021-05-02 18:52:43,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0265486725663717) internal successors, (116), 113 states have internal predecessors, (116), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:43,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2021-05-02 18:52:43,559 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 107 [2021-05-02 18:52:43,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:43,559 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2021-05-02 18:52:43,559 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.5535714285714284) internal successors, (143), 55 states have internal predecessors, (143), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:43,559 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2021-05-02 18:52:43,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-02 18:52:43,560 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:43,560 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 27, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:43,764 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 18:52:43,764 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:43,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:43,764 INFO L82 PathProgramCache]: Analyzing trace with hash 1658827800, now seen corresponding path program 19 times [2021-05-02 18:52:43,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:43,764 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910954093] [2021-05-02 18:52:43,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:43,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:44,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:44,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:44,338 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 636 proven. 1107 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:52:44,338 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:44,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910954093] [2021-05-02 18:52:44,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [910954093] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:44,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890043910] [2021-05-02 18:52:44,338 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 18:52:44,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:44,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 18:52:44,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:44,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:44,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 636 proven. 1107 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:52:44,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890043910] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:44,638 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:44,638 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 18:52:44,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824384466] [2021-05-02 18:52:44,639 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 18:52:44,639 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:44,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 18:52:44,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:52:44,639 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:46,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:46,777 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2021-05-02 18:52:46,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 18:52:46,777 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 116 [2021-05-02 18:52:46,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:46,778 INFO L225 Difference]: With dead ends: 122 [2021-05-02 18:52:46,778 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 18:52:46,779 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 1530.4ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 18:52:46,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 18:52:46,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-05-02 18:52:46,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:46,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-05-02 18:52:46,782 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 116 [2021-05-02 18:52:46,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:46,782 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-05-02 18:52:46,782 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:46,782 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-05-02 18:52:46,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-02 18:52:46,783 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:46,783 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:46,992 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:52:46,993 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:46,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:46,993 INFO L82 PathProgramCache]: Analyzing trace with hash -1048462298, now seen corresponding path program 20 times [2021-05-02 18:52:46,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:46,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165282469] [2021-05-02 18:52:46,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:47,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:47,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:47,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:47,666 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 659 proven. 1190 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:52:47,666 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:47,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165282469] [2021-05-02 18:52:47,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165282469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:47,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635152883] [2021-05-02 18:52:47,667 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 18:52:47,748 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:52:47,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:47,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 18:52:47,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:47,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:48,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 659 proven. 1190 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:52:48,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635152883] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:48,017 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:48,017 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 18:52:48,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729237611] [2021-05-02 18:52:48,018 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 18:52:48,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:48,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 18:52:48,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:52:48,019 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:50,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:52:50,251 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-05-02 18:52:50,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 18:52:50,252 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-02 18:52:50,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:52:50,252 INFO L225 Difference]: With dead ends: 125 [2021-05-02 18:52:50,253 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 18:52:50,253 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 1621.4ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 18:52:50,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 18:52:50,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-05-02 18:52:50,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0252100840336134) internal successors, (122), 119 states have internal predecessors, (122), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:50,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2021-05-02 18:52:50,256 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 119 [2021-05-02 18:52:50,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:52:50,256 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2021-05-02 18:52:50,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:52:50,257 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2021-05-02 18:52:50,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-02 18:52:50,257 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:52:50,257 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:52:50,464 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 18:52:50,465 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:52:50,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:52:50,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1263079768, now seen corresponding path program 21 times [2021-05-02 18:52:50,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:52:50,465 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734137619] [2021-05-02 18:52:50,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:52:50,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:51,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:52:51,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:52:51,148 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 682 proven. 1276 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:52:51,149 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:52:51,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734137619] [2021-05-02 18:52:51,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734137619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:51,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636175557] [2021-05-02 18:52:51,149 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 18:52:51,726 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 18:52:51,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:52:51,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 18:52:51,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:52:51,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:52:53,935 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 745 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-02 18:52:53,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636175557] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:52:53,935 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:52:53,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 14] total 45 [2021-05-02 18:52:53,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850953928] [2021-05-02 18:52:53,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 18:52:53,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:52:53,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 18:52:53,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 18:52:53,937 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:53:00,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:00,069 INFO L93 Difference]: Finished difference Result 135 states and 137 transitions. [2021-05-02 18:53:00,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:53:00,069 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2021-05-02 18:53:00,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:00,070 INFO L225 Difference]: With dead ends: 135 [2021-05-02 18:53:00,070 INFO L226 Difference]: Without dead ends: 135 [2021-05-02 18:53:00,071 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 101 SyntacticMatches, 13 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 958 ImplicationChecksByTransitivity, 5915.8ms TimeCoverageRelationStatistics Valid=593, Invalid=7063, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 18:53:00,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-02 18:53:00,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 133. [2021-05-02 18:53:00,073 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 18:53:00,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-02 18:53:00,074 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 122 [2021-05-02 18:53:00,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:00,074 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-02 18:53:00,074 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:53:00,074 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-02 18:53:00,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 18:53:00,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:00,075 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:00,278 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:53:00,278 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:00,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:00,278 INFO L82 PathProgramCache]: Analyzing trace with hash -400615067, now seen corresponding path program 22 times [2021-05-02 18:53:00,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:00,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761416066] [2021-05-02 18:53:00,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:00,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:01,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:01,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:01,149 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:53:01,150 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:01,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761416066] [2021-05-02 18:53:01,150 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761416066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:01,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905090964] [2021-05-02 18:53:01,150 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 18:53:01,202 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:53:01,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:53:01,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 18:53:01,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:53:01,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:53:01,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:53:01,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [905090964] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:01,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:53:01,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 18:53:01,482 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298531297] [2021-05-02 18:53:01,482 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 18:53:01,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:53:01,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 18:53:01,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:53:01,485 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 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 18:53:04,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:53:04,247 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2021-05-02 18:53:04,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:53:04,248 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 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 18:53:04,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:53:04,248 INFO L225 Difference]: With dead ends: 137 [2021-05-02 18:53:04,248 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 18:53:04,249 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 2065.0ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 18:53:04,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 18:53:04,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2021-05-02 18:53:04,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.0229007633587786) internal successors, (134), 131 states have internal predecessors, (134), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:53:04,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2021-05-02 18:53:04,251 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 131 [2021-05-02 18:53:04,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:53:04,251 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2021-05-02 18:53:04,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 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 18:53:04,252 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2021-05-02 18:53:04,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-02 18:53:04,252 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:53:04,252 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:53:04,460 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 18:53:04,461 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:53:04,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:53:04,461 INFO L82 PathProgramCache]: Analyzing trace with hash 371602327, now seen corresponding path program 23 times [2021-05-02 18:53:04,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:53:04,461 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827337546] [2021-05-02 18:53:04,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:53:04,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:05,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:53:05,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:53:05,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:53:05,290 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:53:05,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827337546] [2021-05-02 18:53:05,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1827337546] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:53:05,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676346876] [2021-05-02 18:53:05,290 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 18:54:53,122 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2021-05-02 18:54:53,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:54:53,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 18:54:53,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:54:53,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:54:53,488 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:54:53,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676346876] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:53,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:54:53,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 18:54:53,489 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388159046] [2021-05-02 18:54:53,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 18:54:53,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:54:53,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 18:54:53,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 18:54:53,489 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 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 18:54:56,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:54:56,138 INFO L93 Difference]: Finished difference Result 140 states and 142 transitions. [2021-05-02 18:54:56,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 18:54:56,138 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-05-02 18:54:56,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:54:56,139 INFO L225 Difference]: With dead ends: 140 [2021-05-02 18:54:56,139 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 18:54:56,139 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 132 SyntacticMatches, 5 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 2017.5ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:54:56,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 18:54:56,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 18:54:56,141 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 18:54:56,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 18:54:56,142 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 134 [2021-05-02 18:54:56,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:54:56,142 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 18:54:56,143 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 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 18:54:56,143 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 18:54:56,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 18:54:56,143 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:54:56,143 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:54:56,351 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:54:56,352 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:54:56,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:54:56,352 INFO L82 PathProgramCache]: Analyzing trace with hash 1655149605, now seen corresponding path program 24 times [2021-05-02 18:54:56,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:54:56,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236654660] [2021-05-02 18:54:56,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:54:56,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:57,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:54:57,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:54:57,125 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 875 proven. 1650 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:54:57,125 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:54:57,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236654660] [2021-05-02 18:54:57,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236654660] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:54:57,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [437086406] [2021-05-02 18:54:57,125 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 18:55:01,402 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 18:55:01,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:01,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 18:55:01,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:04,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:08,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:08,174 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 1220 proven. 907 refuted. 0 times theorem prover too weak. 498 trivial. 0 not checked. [2021-05-02 18:55:08,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [437086406] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:08,174 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:08,174 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 41] total 76 [2021-05-02 18:55:08,174 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274464285] [2021-05-02 18:55:08,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-02 18:55:08,174 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:08,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-02 18:55:08,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=5193, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 18:55:08,175 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 76 states, 76 states have (on average 2.4473684210526314) internal successors, (186), 75 states have internal predecessors, (186), 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 18:55:20,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:20,571 INFO L93 Difference]: Finished difference Result 189 states and 204 transitions. [2021-05-02 18:55:20,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-02 18:55:20,571 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 2.4473684210526314) internal successors, (186), 75 states have internal predecessors, (186), 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 18:55:20,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:20,572 INFO L225 Difference]: With dead ends: 189 [2021-05-02 18:55:20,572 INFO L226 Difference]: Without dead ends: 189 [2021-05-02 18:55:20,574 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 85 SyntacticMatches, 17 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4215 ImplicationChecksByTransitivity, 15208.9ms TimeCoverageRelationStatistics Valid=3162, Invalid=19188, Unknown=0, NotChecked=0, Total=22350 [2021-05-02 18:55:20,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-05-02 18:55:20,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 148. [2021-05-02 18:55:20,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.020979020979021) internal successors, (146), 143 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:55:20,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2021-05-02 18:55:20,577 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 137 [2021-05-02 18:55:20,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:20,577 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2021-05-02 18:55:20,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 2.4473684210526314) internal successors, (186), 75 states have internal predecessors, (186), 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 18:55:20,577 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2021-05-02 18:55:20,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-02 18:55:20,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:20,578 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 35, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:20,792 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:55:20,792 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:20,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:20,793 INFO L82 PathProgramCache]: Analyzing trace with hash 1052809720, now seen corresponding path program 25 times [2021-05-02 18:55:20,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:20,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [556119873] [2021-05-02 18:55:20,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:20,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:22,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:22,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:22,125 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1034 proven. 1855 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:55:22,125 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:22,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [556119873] [2021-05-02 18:55:22,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [556119873] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:22,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [939361624] [2021-05-02 18:55:22,127 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 18:55:22,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:22,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 73 conjunts are in the unsatisfiable core [2021-05-02 18:55:22,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:22,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:22,577 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1034 proven. 1855 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:55:22,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [939361624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:22,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:22,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 18:55:22,579 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107446307] [2021-05-02 18:55:22,580 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 18:55:22,580 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:22,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 18:55:22,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 18:55:22,581 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 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 18:55:27,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:27,263 INFO L93 Difference]: Finished difference Result 152 states and 154 transitions. [2021-05-02 18:55:27,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 18:55:27,264 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2021-05-02 18:55:27,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:27,265 INFO L225 Difference]: With dead ends: 152 [2021-05-02 18:55:27,265 INFO L226 Difference]: Without dead ends: 152 [2021-05-02 18:55:27,266 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 148 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 634 ImplicationChecksByTransitivity, 3155.0ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 18:55:27,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-02 18:55:27,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2021-05-02 18:55:27,268 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 18:55:27,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-02 18:55:27,269 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 146 [2021-05-02 18:55:27,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:27,269 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-02 18:55:27,269 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 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 18:55:27,270 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-02 18:55:27,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-02 18:55:27,270 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:27,270 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 36, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:27,480 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:55:27,481 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:27,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:27,481 INFO L82 PathProgramCache]: Analyzing trace with hash 1088394630, now seen corresponding path program 26 times [2021-05-02 18:55:27,481 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:27,481 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328726269] [2021-05-02 18:55:27,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:27,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:29,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:29,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:29,390 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1063 proven. 1962 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:55:29,390 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:29,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328726269] [2021-05-02 18:55:29,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328726269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:29,391 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185115857] [2021-05-02 18:55:29,391 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 18:55:29,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:55:29,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:29,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 75 conjunts are in the unsatisfiable core [2021-05-02 18:55:29,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:29,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:29,908 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1063 proven. 1962 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:55:29,908 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1185115857] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:29,908 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:29,908 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 18:55:29,908 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426701849] [2021-05-02 18:55:29,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 18:55:29,909 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:29,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 18:55:29,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:55:29,928 INFO L87 Difference]: Start difference. First operand 151 states and 153 transitions. Second operand has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 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 18:55:34,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:34,579 INFO L93 Difference]: Finished difference Result 155 states and 157 transitions. [2021-05-02 18:55:34,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 18:55:34,580 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 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 18:55:34,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:34,581 INFO L225 Difference]: With dead ends: 155 [2021-05-02 18:55:34,581 INFO L226 Difference]: Without dead ends: 155 [2021-05-02 18:55:34,581 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 670 ImplicationChecksByTransitivity, 3742.6ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 18:55:34,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-02 18:55:34,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2021-05-02 18:55:34,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 149 states have (on average 1.0201342281879195) internal successors, (152), 149 states have internal predecessors, (152), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:55:34,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 156 transitions. [2021-05-02 18:55:34,584 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 156 transitions. Word has length 149 [2021-05-02 18:55:34,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:34,585 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 156 transitions. [2021-05-02 18:55:34,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 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 18:55:34,585 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 156 transitions. [2021-05-02 18:55:34,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-05-02 18:55:34,586 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:34,586 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 37, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:34,797 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 18:55:34,797 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:34,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:34,797 INFO L82 PathProgramCache]: Analyzing trace with hash 341526328, now seen corresponding path program 27 times [2021-05-02 18:55:34,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:34,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680536039] [2021-05-02 18:55:34,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:34,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:36,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:36,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:36,175 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1092 proven. 2072 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:55:36,175 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:36,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680536039] [2021-05-02 18:55:36,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680536039] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:36,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [996040175] [2021-05-02 18:55:36,175 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 18:55:37,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 18:55:37,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:37,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 18:55:37,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:37,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:41,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:41,167 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1173 proven. 155 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2021-05-02 18:55:41,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [996040175] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:41,167 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:41,167 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 16] total 55 [2021-05-02 18:55:41,167 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151778746] [2021-05-02 18:55:41,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 18:55:41,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:41,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 18:55:41,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 18:55:41,169 INFO L87 Difference]: Start difference. First operand 154 states and 156 transitions. Second operand has 55 states, 55 states have (on average 2.9272727272727272) internal successors, (161), 54 states have internal predecessors, (161), 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 18:55:51,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:51,837 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2021-05-02 18:55:51,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 18:55:51,838 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.9272727272727272) internal successors, (161), 54 states have internal predecessors, (161), 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 152 [2021-05-02 18:55:51,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:51,839 INFO L225 Difference]: With dead ends: 165 [2021-05-02 18:55:51,839 INFO L226 Difference]: Without dead ends: 165 [2021-05-02 18:55:51,840 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 129 SyntacticMatches, 13 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1440 ImplicationChecksByTransitivity, 10023.2ms TimeCoverageRelationStatistics Valid=739, Invalid=10817, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 18:55:51,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-05-02 18:55:51,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 163. [2021-05-02 18:55:51,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.018987341772152) internal successors, (161), 158 states have internal predecessors, (161), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:55:51,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 165 transitions. [2021-05-02 18:55:51,843 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 165 transitions. Word has length 152 [2021-05-02 18:55:51,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:51,843 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 165 transitions. [2021-05-02 18:55:51,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 2.9272727272727272) internal successors, (161), 54 states have internal predecessors, (161), 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 18:55:51,843 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 165 transitions. [2021-05-02 18:55:51,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-02 18:55:51,844 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:51,844 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 39, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:52,047 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:55:52,048 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:52,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:52,048 INFO L82 PathProgramCache]: Analyzing trace with hash 328419205, now seen corresponding path program 28 times [2021-05-02 18:55:52,048 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:52,048 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531891027] [2021-05-02 18:55:52,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:52,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:53,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:53,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:53,269 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1269 proven. 2301 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:55:53,270 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:53,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531891027] [2021-05-02 18:55:53,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1531891027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:53,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1313176941] [2021-05-02 18:55:53,270 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 18:55:53,340 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:55:53,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:55:53,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 81 conjunts are in the unsatisfiable core [2021-05-02 18:55:53,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:55:53,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:55:53,660 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1269 proven. 2301 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:55:53,661 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1313176941] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:53,661 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:55:53,661 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 18:55:53,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924312606] [2021-05-02 18:55:53,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 18:55:53,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:55:53,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 18:55:53,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:55:53,662 INFO L87 Difference]: Start difference. First operand 163 states and 165 transitions. Second operand has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 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 18:55:57,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:55:57,890 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2021-05-02 18:55:57,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:55:57,891 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2021-05-02 18:55:57,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:55:57,891 INFO L225 Difference]: With dead ends: 167 [2021-05-02 18:55:57,891 INFO L226 Difference]: Without dead ends: 167 [2021-05-02 18:55:57,892 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 163 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 2893.2ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:55:57,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-02 18:55:57,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2021-05-02 18:55:57,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.0186335403726707) internal successors, (164), 161 states have internal predecessors, (164), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:55:57,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 168 transitions. [2021-05-02 18:55:57,895 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 168 transitions. Word has length 161 [2021-05-02 18:55:57,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:55:57,895 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 168 transitions. [2021-05-02 18:55:57,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 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 18:55:57,895 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 168 transitions. [2021-05-02 18:55:57,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-05-02 18:55:57,896 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:55:57,896 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 40, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:55:58,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 18:55:58,101 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:55:58,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:55:58,101 INFO L82 PathProgramCache]: Analyzing trace with hash -181928393, now seen corresponding path program 29 times [2021-05-02 18:55:58,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:55:58,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126804192] [2021-05-02 18:55:58,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:55:58,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:59,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:55:59,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:55:59,364 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1301 proven. 2420 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:55:59,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:55:59,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126804192] [2021-05-02 18:55:59,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126804192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:55:59,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904225106] [2021-05-02 18:55:59,365 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 18:58:50,857 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 52 check-sat command(s) [2021-05-02 18:58:50,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:58:50,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 127 conjunts are in the unsatisfiable core [2021-05-02 18:58:50,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:58:55,900 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1301 proven. 2420 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:58:55,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904225106] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:58:55,900 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:58:55,900 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45] total 64 [2021-05-02 18:58:55,901 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545390658] [2021-05-02 18:58:55,901 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 18:58:55,901 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:58:55,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 18:58:55,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=3828, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 18:58:55,902 INFO L87 Difference]: Start difference. First operand 166 states and 168 transitions. Second operand has 64 states, 64 states have (on average 2.953125) internal successors, (189), 63 states have internal predecessors, (189), 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 18:59:03,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:59:03,437 INFO L93 Difference]: Finished difference Result 170 states and 172 transitions. [2021-05-02 18:59:03,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:59:03,440 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.953125) internal successors, (189), 63 states have internal predecessors, (189), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 164 [2021-05-02 18:59:03,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:59:03,448 INFO L225 Difference]: With dead ends: 170 [2021-05-02 18:59:03,448 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 18:59:03,448 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 111 SyntacticMatches, 37 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2150 ImplicationChecksByTransitivity, 8655.4ms TimeCoverageRelationStatistics Valid=440, Invalid=10902, Unknown=0, NotChecked=0, Total=11342 [2021-05-02 18:59:03,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 18:59:03,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-02 18:59:03,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:59:03,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2021-05-02 18:59:03,452 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 164 [2021-05-02 18:59:03,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:59:03,453 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2021-05-02 18:59:03,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 2.953125) internal successors, (189), 63 states have internal predecessors, (189), 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 18:59:03,453 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2021-05-02 18:59:03,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-02 18:59:03,454 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:59:03,454 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 41, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:59:03,659 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 18:59:03,659 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:59:03,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:59:03,659 INFO L82 PathProgramCache]: Analyzing trace with hash 237007429, now seen corresponding path program 30 times [2021-05-02 18:59:03,659 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:59:03,660 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768617581] [2021-05-02 18:59:03,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:59:03,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:59:05,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:59:05,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:59:05,647 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1333 proven. 2542 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:59:05,648 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:59:05,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768617581] [2021-05-02 18:59:05,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1768617581] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:59:05,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553275347] [2021-05-02 18:59:05,648 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 18:59:09,150 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2021-05-02 18:59:09,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:59:09,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 18:59:09,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:59:09,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:59:09,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:59:09,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:59:12,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:59:12,888 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1423 proven. 187 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2021-05-02 18:59:12,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553275347] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:59:12,888 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:59:12,888 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 17] total 60 [2021-05-02 18:59:12,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335738625] [2021-05-02 18:59:12,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 18:59:12,889 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:59:12,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 18:59:12,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3367, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 18:59:12,890 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 59 states have internal predecessors, (176), 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 18:59:15,224 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 38 [2021-05-02 18:59:15,841 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 38 [2021-05-02 18:59:16,558 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 38 [2021-05-02 18:59:17,206 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 38 [2021-05-02 18:59:17,832 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 38 [2021-05-02 18:59:21,659 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 38 [2021-05-02 18:59:26,531 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 38 [2021-05-02 18:59:28,812 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 38 [2021-05-02 18:59:29,308 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 38 [2021-05-02 18:59:31,780 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 48 [2021-05-02 18:59:33,022 WARN L205 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 43 [2021-05-02 18:59:34,261 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 45 [2021-05-02 18:59:35,833 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 43 [2021-05-02 18:59:38,465 WARN L205 SmtUtils]: Spent 490.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 45 [2021-05-02 18:59:41,677 WARN L205 SmtUtils]: Spent 459.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 45 [2021-05-02 18:59:46,673 WARN L205 SmtUtils]: Spent 948.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 45 [2021-05-02 18:59:51,950 WARN L205 SmtUtils]: Spent 546.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 45 [2021-05-02 18:59:55,647 WARN L205 SmtUtils]: Spent 330.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 45 [2021-05-02 18:59:58,614 WARN L205 SmtUtils]: Spent 575.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 45 [2021-05-02 19:00:01,183 WARN L205 SmtUtils]: Spent 332.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 45 [2021-05-02 19:00:03,369 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 45 [2021-05-02 19:00:04,610 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 19:00:05,372 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:00:07,755 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-05-02 19:00:08,210 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 45 [2021-05-02 19:00:08,675 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 43 [2021-05-02 19:00:09,327 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:00:09,953 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 43 [2021-05-02 19:00:10,598 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 45 [2021-05-02 19:00:11,284 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 43 [2021-05-02 19:00:12,104 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 19:00:13,440 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 43 [2021-05-02 19:00:14,401 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 45 [2021-05-02 19:00:15,676 WARN L205 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 43 [2021-05-02 19:00:16,758 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2021-05-02 19:00:18,649 WARN L205 SmtUtils]: Spent 452.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 43 [2021-05-02 19:00:18,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:00:18,651 INFO L93 Difference]: Finished difference Result 204 states and 214 transitions. [2021-05-02 19:00:18,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-02 19:00:18,652 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 59 states have internal predecessors, (176), 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 167 [2021-05-02 19:00:18,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:00:18,653 INFO L225 Difference]: With dead ends: 204 [2021-05-02 19:00:18,653 INFO L226 Difference]: Without dead ends: 204 [2021-05-02 19:00:18,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 151 SyntacticMatches, 5 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2650 ImplicationChecksByTransitivity, 64615.9ms TimeCoverageRelationStatistics Valid=2092, Invalid=15730, Unknown=0, NotChecked=0, Total=17822 [2021-05-02 19:00:18,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-05-02 19:00:18,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 178. [2021-05-02 19:00:18,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.0173410404624277) internal successors, (176), 173 states have internal predecessors, (176), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:00:18,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 180 transitions. [2021-05-02 19:00:18,660 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 180 transitions. Word has length 167 [2021-05-02 19:00:18,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:00:18,660 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 180 transitions. [2021-05-02 19:00:18,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 59 states have internal predecessors, (176), 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 19:00:18,660 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 180 transitions. [2021-05-02 19:00:18,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-02 19:00:18,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:00:18,662 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 43, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:00:18,869 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 19:00:18,869 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:00:18,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:00:18,869 INFO L82 PathProgramCache]: Analyzing trace with hash 1736628184, now seen corresponding path program 31 times [2021-05-02 19:00:18,870 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:00:18,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092378893] [2021-05-02 19:00:18,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:00:18,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:00:22,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:00:22,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:00:22,089 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1528 proven. 2795 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 19:00:22,089 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:00:22,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092378893] [2021-05-02 19:00:22,089 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092378893] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:00:22,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45674636] [2021-05-02 19:00:22,089 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 19:00:22,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:00:22,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 19:00:22,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:00:23,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:00:23,431 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1528 proven. 2795 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 19:00:23,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [45674636] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:00:23,431 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:00:23,431 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-02 19:00:23,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943198493] [2021-05-02 19:00:23,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 19:00:23,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:00:23,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 19:00:23,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 19:00:23,433 INFO L87 Difference]: Start difference. First operand 178 states and 180 transitions. Second operand has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 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 19:00:39,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:00:39,165 INFO L93 Difference]: Finished difference Result 182 states and 184 transitions. [2021-05-02 19:00:39,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 19:00:39,167 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 176 [2021-05-02 19:00:39,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:00:39,168 INFO L225 Difference]: With dead ends: 182 [2021-05-02 19:00:39,168 INFO L226 Difference]: Without dead ends: 182 [2021-05-02 19:00:39,174 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 8369.1ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-02 19:00:39,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-02 19:00:39,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2021-05-02 19:00:39,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0170454545454546) internal successors, (179), 176 states have internal predecessors, (179), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:00:39,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2021-05-02 19:00:39,186 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 176 [2021-05-02 19:00:39,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:00:39,186 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2021-05-02 19:00:39,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 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 19:00:39,186 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2021-05-02 19:00:39,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-02 19:00:39,187 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:00:39,187 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 44, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:00:39,400 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 19:00:39,401 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:00:39,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:00:39,401 INFO L82 PathProgramCache]: Analyzing trace with hash 915908326, now seen corresponding path program 32 times [2021-05-02 19:00:39,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:00:39,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426565619] [2021-05-02 19:00:39,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:00:39,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:00:42,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:00:42,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:00:42,410 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1563 proven. 2926 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 19:00:42,410 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:00:42,410 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426565619] [2021-05-02 19:00:42,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426565619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:00:42,410 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687854068] [2021-05-02 19:00:42,410 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 19:00:42,510 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:00:42,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:00:42,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 19:00:42,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:00:43,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:00:43,711 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1563 proven. 2926 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 19:00:43,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [687854068] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:00:43,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:00:43,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 19:00:43,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026477165] [2021-05-02 19:00:43,712 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 19:00:43,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:00:43,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 19:00:43,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 19:00:43,713 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 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 19:00:57,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:00:57,888 INFO L93 Difference]: Finished difference Result 185 states and 187 transitions. [2021-05-02 19:00:57,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 19:00:57,891 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2021-05-02 19:00:57,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:00:57,892 INFO L225 Difference]: With dead ends: 185 [2021-05-02 19:00:57,892 INFO L226 Difference]: Without dead ends: 185 [2021-05-02 19:00:57,893 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 7898.6ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 19:00:57,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-02 19:00:57,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-05-02 19:00:57,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.0167597765363128) internal successors, (182), 179 states have internal predecessors, (182), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:00:57,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 186 transitions. [2021-05-02 19:00:57,897 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 186 transitions. Word has length 179 [2021-05-02 19:00:57,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:00:57,898 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 186 transitions. [2021-05-02 19:00:57,898 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 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 19:00:57,898 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 186 transitions. [2021-05-02 19:00:57,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-02 19:00:57,899 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:00:57,899 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 45, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:00:58,121 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 19:00:58,121 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:00:58,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:00:58,121 INFO L82 PathProgramCache]: Analyzing trace with hash 2099434776, now seen corresponding path program 33 times [2021-05-02 19:00:58,122 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:00:58,122 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208019912] [2021-05-02 19:00:58,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:00:58,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:01,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:01:01,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:01,451 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1598 proven. 3060 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 19:01:01,452 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:01:01,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208019912] [2021-05-02 19:01:01,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208019912] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:01,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579524148] [2021-05-02 19:01:01,452 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 19:01:02,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-05-02 19:01:02,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:01:02,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 19:01:02,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:01:11,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:01:11,163 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1697 proven. 222 refuted. 0 times theorem prover too weak. 2926 trivial. 0 not checked. [2021-05-02 19:01:11,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1579524148] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:11,163 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:01:11,164 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 18] total 65 [2021-05-02 19:01:11,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386081161] [2021-05-02 19:01:11,164 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 19:01:11,164 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:01:11,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 19:01:11,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=3972, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 19:01:11,165 INFO L87 Difference]: Start difference. First operand 184 states and 186 transitions. Second operand has 65 states, 65 states have (on average 2.9384615384615387) internal successors, (191), 64 states have internal predecessors, (191), 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 19:01:13,203 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:13,912 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:14,552 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:15,152 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:15,888 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:16,652 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:17,260 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:17,928 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:18,750 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:19,517 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:20,298 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:21,056 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:21,674 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:22,515 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:24,035 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:24,931 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:25,653 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:26,500 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:27,316 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:27,913 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:28,667 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:29,482 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:30,296 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:31,125 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:32,019 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:32,935 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:33,831 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:34,646 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:35,277 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:36,143 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:36,951 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:37,723 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:38,560 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:39,329 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:40,268 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 38 [2021-05-02 19:01:43,401 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2021-05-02 19:01:44,481 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-05-02 19:01:45,009 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 45 [2021-05-02 19:01:45,712 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:01:46,277 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:01:46,886 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:01:47,479 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:01:48,128 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:01:49,249 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:01:50,429 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:01:51,471 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:01:52,772 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:01:54,332 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 19:01:56,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:01:56,740 INFO L93 Difference]: Finished difference Result 198 states and 201 transitions. [2021-05-02 19:01:56,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-02 19:01:56,741 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.9384615384615387) internal successors, (191), 64 states have internal predecessors, (191), 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 182 [2021-05-02 19:01:56,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:01:56,742 INFO L225 Difference]: With dead ends: 198 [2021-05-02 19:01:56,742 INFO L226 Difference]: Without dead ends: 198 [2021-05-02 19:01:56,743 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 166 SyntacticMatches, 4 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2129 ImplicationChecksByTransitivity, 36488.2ms TimeCoverageRelationStatistics Valid=1051, Invalid=15719, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 19:01:56,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-05-02 19:01:56,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 193. [2021-05-02 19:01:56,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:01:56,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-05-02 19:01:56,747 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 182 [2021-05-02 19:01:56,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:01:56,747 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-05-02 19:01:56,747 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 2.9384615384615387) internal successors, (191), 64 states have internal predecessors, (191), 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 19:01:56,747 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-05-02 19:01:56,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-02 19:01:56,748 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:01:56,749 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 47, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:01:56,953 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 19:01:56,953 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:01:56,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:01:56,953 INFO L82 PathProgramCache]: Analyzing trace with hash 1256136101, now seen corresponding path program 34 times [2021-05-02 19:01:56,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:01:56,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953872894] [2021-05-02 19:01:56,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:01:56,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:59,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:01:59,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:01:59,803 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1811 proven. 3337 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-05-02 19:01:59,803 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:01:59,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953872894] [2021-05-02 19:01:59,803 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1953872894] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:01:59,804 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997065971] [2021-05-02 19:01:59,804 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 19:01:59,874 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:01:59,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:01:59,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 19:01:59,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:02:00,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:02:00,864 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1811 proven. 3337 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-05-02 19:02:00,864 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [997065971] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:00,865 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:02:00,865 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 19:02:00,865 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332833695] [2021-05-02 19:02:00,865 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 19:02:00,865 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:02:00,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 19:02:00,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 19:02:00,866 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:02:16,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:02:16,387 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2021-05-02 19:02:16,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 19:02:16,390 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 191 [2021-05-02 19:02:16,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:02:16,391 INFO L225 Difference]: With dead ends: 197 [2021-05-02 19:02:16,391 INFO L226 Difference]: Without dead ends: 197 [2021-05-02 19:02:16,392 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 193 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 7814.8ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 19:02:16,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-02 19:02:16,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2021-05-02 19:02:16,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.0157068062827226) internal successors, (194), 191 states have internal predecessors, (194), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:02:16,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2021-05-02 19:02:16,396 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 191 [2021-05-02 19:02:16,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:02:16,396 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2021-05-02 19:02:16,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:02:16,397 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2021-05-02 19:02:16,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-05-02 19:02:16,397 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:02:16,398 INFO L523 BasicCegarLoop]: trace histogram [61, 61, 48, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:02:16,612 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 19:02:16,613 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:02:16,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:02:16,613 INFO L82 PathProgramCache]: Analyzing trace with hash 967610583, now seen corresponding path program 35 times [2021-05-02 19:02:16,613 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:02:16,613 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966930392] [2021-05-02 19:02:16,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:02:16,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:20,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:02:20,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:02:20,279 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1849 proven. 3480 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-05-02 19:02:20,279 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:02:20,279 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966930392] [2021-05-02 19:02:20,280 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966930392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:02:20,280 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736120971] [2021-05-02 19:02:20,280 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