/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/Mono3_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:23:48,454 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:23:48,457 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:23:48,485 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 18:23:48,493 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:23:48,494 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:23:48,495 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:23:48,496 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:23:48,496 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:23:48,497 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:23:48,498 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:23:48,500 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:23:48,501 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:23:48,502 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:23:48,503 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:23:48,503 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:23:48,505 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:23:48,520 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:23:48,521 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:23:48,521 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:23:48,523 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:23:48,539 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:23:48,539 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:23:48,541 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:23:48,541 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:23:48,541 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:23:48,541 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:23:48,541 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:23:48,542 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:23:48,542 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:23:48,542 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:23:48,542 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:23:48,542 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:23:48,543 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:23:48,543 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:23:48,543 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:23:48,543 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:23:48,543 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:23:48,543 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:23:48,544 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:23:48,544 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:23:48,544 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:23:48,547 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:23:48,547 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:23:48,821 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:23:48,844 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:23:48,846 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:23:48,847 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:23:48,848 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:23:48,849 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono3_1.c [2021-05-02 18:23:48,909 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d29ba2ea3/e822ddb349254b1eb80127ce30c47057/FLAG060ebbebd [2021-05-02 18:23:49,453 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:23:49,453 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono3_1.c [2021-05-02 18:23:49,458 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d29ba2ea3/e822ddb349254b1eb80127ce30c47057/FLAG060ebbebd [2021-05-02 18:23:49,711 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d29ba2ea3/e822ddb349254b1eb80127ce30c47057 [2021-05-02 18:23:49,715 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:23:49,717 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:23:49,721 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:23:49,721 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:23:49,724 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:23:49,725 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:23:49" (1/1) ... [2021-05-02 18:23:49,726 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5219bfdd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:49, skipping insertion in model container [2021-05-02 18:23:49,726 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:23:49" (1/1) ... [2021-05-02 18:23:49,733 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:23:49,746 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:23:49,889 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/Mono3_1.c[311,324] [2021-05-02 18:23:49,900 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:23:49,909 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:23:49,924 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/Mono3_1.c[311,324] [2021-05-02 18:23:49,928 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:23:49,940 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:23:49,941 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:49 WrapperNode [2021-05-02 18:23:49,941 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:23:49,942 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:23:49,942 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:23:49,942 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:23:49,998 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:49" (1/1) ... [2021-05-02 18:23:50,001 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:49" (1/1) ... [2021-05-02 18:23:50,020 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:49" (1/1) ... [2021-05-02 18:23:50,020 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:49" (1/1) ... [2021-05-02 18:23:50,024 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:49" (1/1) ... [2021-05-02 18:23:50,027 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:49" (1/1) ... [2021-05-02 18:23:50,028 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:49" (1/1) ... [2021-05-02 18:23:50,030 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:23:50,031 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:23:50,031 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:23:50,031 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:23:50,032 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:49" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:23:50,090 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:23:50,091 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:23:50,091 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:23:50,091 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:23:50,091 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:23:50,091 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:23:50,092 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:23:50,092 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:23:50,092 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:23:50,092 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:23:50,093 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:23:50,093 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:23:50,093 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:23:50,093 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:23:50,093 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:23:50,094 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:23:50,094 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:23:50,331 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:23:50,331 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:23:50,332 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:50 BoogieIcfgContainer [2021-05-02 18:23:50,332 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:23:50,333 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:23:50,333 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:23:50,334 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:23:50,336 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:50" (1/1) ... [2021-05-02 18:23:50,348 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:23:50 BasicIcfg [2021-05-02 18:23:50,348 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:23:50,349 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:23:50,350 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:23:50,352 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:23:50,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:23:49" (1/4) ... [2021-05-02 18:23:50,352 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b4da369 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:23:50, skipping insertion in model container [2021-05-02 18:23:50,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:23:49" (2/4) ... [2021-05-02 18:23:50,355 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b4da369 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:23:50, skipping insertion in model container [2021-05-02 18:23:50,355 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:23:50" (3/4) ... [2021-05-02 18:23:50,356 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b4da369 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:23:50, skipping insertion in model container [2021-05-02 18:23:50,356 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:23:50" (4/4) ... [2021-05-02 18:23:50,357 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono3_1.cJordan [2021-05-02 18:23:50,361 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:23:50,364 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:23:50,377 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:23:50,391 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:23:50,391 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:23:50,391 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:23:50,392 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:23:50,392 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:23:50,392 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:23:50,392 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:23:50,392 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:23:50,402 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:23:50,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:23:50,407 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:50,408 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:50,408 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:50,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:50,429 INFO L82 PathProgramCache]: Analyzing trace with hash -154368955, now seen corresponding path program 1 times [2021-05-02 18:23:50,436 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:50,436 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795884386] [2021-05-02 18:23:50,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:50,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:50,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,673 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:50,674 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:50,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795884386] [2021-05-02 18:23:50,675 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795884386] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:50,675 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:23:50,675 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:23:50,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601997047] [2021-05-02 18:23:50,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:23:50,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:50,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:23:50,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:23:50,703 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:50,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:50,746 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-02 18:23:50,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:23:50,747 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 18:23:50,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:50,753 INFO L225 Difference]: With dead ends: 20 [2021-05-02 18:23:50,753 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 18:23:50,754 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:23:50,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 18:23:50,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 18:23:50,771 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 18:23:50,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 18:23:50,773 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 18:23:50,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:50,773 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 18:23:50,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:50,774 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 18:23:50,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:23:50,774 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:50,775 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:50,775 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:23:50,775 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:50,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:50,776 INFO L82 PathProgramCache]: Analyzing trace with hash -153445434, now seen corresponding path program 1 times [2021-05-02 18:23:50,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:50,776 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182957072] [2021-05-02 18:23:50,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:50,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:50,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:50,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:50,851 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:50,851 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182957072] [2021-05-02 18:23:50,851 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182957072] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:50,851 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:23:50,851 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:23:50,852 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692868773] [2021-05-02 18:23:50,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:23:50,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:50,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:23:50,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:23:50,854 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 18:23:50,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:50,943 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-05-02 18:23:50,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:23:50,944 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 18:23:50,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:50,945 INFO L225 Difference]: With dead ends: 17 [2021-05-02 18:23:50,945 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 18:23:50,946 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 70.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:23:50,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 18:23:50,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 18:23:50,951 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 18:23:50,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 18:23:50,952 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-02 18:23:50,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:50,952 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 18:23:50,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:50,953 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 18:23:50,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 18:23:50,953 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:50,953 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:50,954 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:23:50,954 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:50,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:50,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1203653974, now seen corresponding path program 1 times [2021-05-02 18:23:50,955 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:50,956 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551045954] [2021-05-02 18:23:50,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:50,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:51,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:51,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:51,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:51,115 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:51,115 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551045954] [2021-05-02 18:23:51,115 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551045954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:51,116 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87892483] [2021-05-02 18:23:51,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:51,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:51,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 18:23:51,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:51,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:51,284 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87892483] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:51,284 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:51,284 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-05-02 18:23:51,285 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700058212] [2021-05-02 18:23:51,285 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:23:51,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:51,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:23:51,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:51,286 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:51,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:51,439 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-02 18:23:51,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:23:51,440 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 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 18:23:51,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:51,441 INFO L225 Difference]: With dead ends: 20 [2021-05-02 18:23:51,441 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 18:23:51,441 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 174.0ms TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:23:51,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 18:23:51,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 18:23:51,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:51,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 18:23:51,444 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 18:23:51,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:51,445 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 18:23:51,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:51,445 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 18:23:51,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:23:51,445 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:51,446 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:51,666 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 18:23:51,667 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:51,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:51,667 INFO L82 PathProgramCache]: Analyzing trace with hash 2024960454, now seen corresponding path program 2 times [2021-05-02 18:23:51,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:51,667 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104152983] [2021-05-02 18:23:51,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:51,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:51,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:51,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:51,807 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 18:23:51,807 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:51,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104152983] [2021-05-02 18:23:51,807 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104152983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:51,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89638199] [2021-05-02 18:23:51,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:51,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:51,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:51,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 18:23:51,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:51,993 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 18:23:51,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89638199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:51,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:51,994 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 11 [2021-05-02 18:23:51,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546457022] [2021-05-02 18:23:51,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:23:51,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:51,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:23:51,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:23:51,996 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:52,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:52,207 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2021-05-02 18:23:52,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 18:23:52,207 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 18:23:52,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:52,208 INFO L225 Difference]: With dead ends: 23 [2021-05-02 18:23:52,208 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 18:23:52,209 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 252.2ms TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:23:52,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 18:23:52,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 18:23:52,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:52,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 18:23:52,212 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-05-02 18:23:52,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:52,212 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 18:23:52,213 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:52,213 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 18:23:52,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 18:23:52,213 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:52,213 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:52,431 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:52,431 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:52,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:52,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1137620822, now seen corresponding path program 3 times [2021-05-02 18:23:52,432 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:52,432 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225621496] [2021-05-02 18:23:52,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:52,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:52,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:52,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:52,534 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 18:23:52,534 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:52,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225621496] [2021-05-02 18:23:52,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225621496] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:52,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254903792] [2021-05-02 18:23:52,534 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:52,578 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:23:52,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:52,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 18:23:52,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:52,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:52,651 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 18:23:52,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254903792] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:52,652 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:23:52,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 9 [2021-05-02 18:23:52,652 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229535513] [2021-05-02 18:23:52,652 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:23:52,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:52,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:23:52,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:23:52,653 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 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 18:23:52,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:52,682 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-05-02 18:23:52,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:23:52,683 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 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 18:23:52,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:52,684 INFO L225 Difference]: With dead ends: 27 [2021-05-02 18:23:52,684 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 18:23:52,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 88.4ms TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:23:52,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 18:23:52,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-05-02 18:23:52,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:52,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 18:23:52,687 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2021-05-02 18:23:52,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:52,687 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 18:23:52,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 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 18:23:52,687 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 18:23:52,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:23:52,688 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:52,688 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:52,909 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:52,910 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:52,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:52,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1481112825, now seen corresponding path program 1 times [2021-05-02 18:23:52,911 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:52,911 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547013171] [2021-05-02 18:23:52,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:52,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:53,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:53,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:53,051 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 18:23:53,053 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:53,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547013171] [2021-05-02 18:23:53,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1547013171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:53,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409079442] [2021-05-02 18:23:53,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:53,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:53,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:23:53,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:53,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:53,204 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 18:23:53,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409079442] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:53,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:53,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 18:23:53,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179831643] [2021-05-02 18:23:53,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:23:53,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:53,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:23:53,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:23:53,205 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 18:23:53,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:53,372 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-05-02 18:23:53,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:23:53,373 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 18:23:53,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:53,374 INFO L225 Difference]: With dead ends: 28 [2021-05-02 18:23:53,374 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 18:23:53,374 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 171.3ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:23:53,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 18:23:53,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 18:23:53,376 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 18:23:53,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-05-02 18:23:53,377 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2021-05-02 18:23:53,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:53,377 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-05-02 18:23:53,377 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 18:23:53,377 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-05-02 18:23:53,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 18:23:53,378 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:53,378 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:53,601 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:53,601 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:53,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:53,602 INFO L82 PathProgramCache]: Analyzing trace with hash 2102254743, now seen corresponding path program 2 times [2021-05-02 18:23:53,602 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:53,602 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325006099] [2021-05-02 18:23:53,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:53,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:53,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:53,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:53,721 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 18:23:53,722 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:53,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325006099] [2021-05-02 18:23:53,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325006099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:53,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882547600] [2021-05-02 18:23:53,722 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:53,768 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:23:53,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:53,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:23:53,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:53,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:53,901 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:53,902 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882547600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:53,902 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:53,902 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-05-02 18:23:53,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591298339] [2021-05-02 18:23:53,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 18:23:53,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:53,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 18:23:53,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:23:53,905 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:54,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:54,177 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-05-02 18:23:54,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 18:23:54,178 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (4), 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 18:23:54,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:54,180 INFO L225 Difference]: With dead ends: 34 [2021-05-02 18:23:54,180 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 18:23:54,180 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 249.5ms TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:23:54,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 18:23:54,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 18:23:54,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:54,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-05-02 18:23:54,191 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 26 [2021-05-02 18:23:54,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:54,192 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-05-02 18:23:54,193 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:54,196 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-05-02 18:23:54,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 18:23:54,198 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:54,198 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:54,415 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 18:23:54,415 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:54,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:54,415 INFO L82 PathProgramCache]: Analyzing trace with hash 571426455, now seen corresponding path program 3 times [2021-05-02 18:23:54,415 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:54,416 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171455936] [2021-05-02 18:23:54,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:54,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:54,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:54,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:54,561 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:54,562 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:54,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171455936] [2021-05-02 18:23:54,562 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1171455936] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:54,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749068261] [2021-05-02 18:23:54,562 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:54,616 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 18:23:54,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:54,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 18:23:54,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:54,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:54,715 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 2 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:23:54,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1749068261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:54,716 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:54,716 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 13 [2021-05-02 18:23:54,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558268783] [2021-05-02 18:23:54,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 18:23:54,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:54,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 18:23:54,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:23:54,717 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:55,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:55,291 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2021-05-02 18:23:55,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:23:55,291 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 18:23:55,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:55,292 INFO L225 Difference]: With dead ends: 48 [2021-05-02 18:23:55,292 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 18:23:55,293 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 555.7ms TimeCoverageRelationStatistics Valid=172, Invalid=478, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:23:55,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 18:23:55,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2021-05-02 18:23:55,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 37 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:55,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2021-05-02 18:23:55,296 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 32 [2021-05-02 18:23:55,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:55,297 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2021-05-02 18:23:55,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:55,297 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2021-05-02 18:23:55,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 18:23:55,298 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:55,298 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:55,504 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:55,505 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:55,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:55,506 INFO L82 PathProgramCache]: Analyzing trace with hash -271813082, now seen corresponding path program 4 times [2021-05-02 18:23:55,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:55,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57208476] [2021-05-02 18:23:55,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:55,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:55,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:55,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:55,681 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 18:23:55,681 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:55,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57208476] [2021-05-02 18:23:55,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57208476] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:55,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680965440] [2021-05-02 18:23:55,681 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:55,732 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:23:55,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:55,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:23:55,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:55,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:55,897 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 19 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:23:55,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680965440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:55,898 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:55,898 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2021-05-02 18:23:55,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122291324] [2021-05-02 18:23:55,901 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:23:55,901 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:55,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:23:55,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:23:55,902 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:56,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:56,423 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2021-05-02 18:23:56,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:23:56,423 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 18:23:56,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:56,424 INFO L225 Difference]: With dead ends: 49 [2021-05-02 18:23:56,424 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 18:23:56,425 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 407.6ms TimeCoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:23:56,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 18:23:56,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-05-02 18:23:56,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:56,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2021-05-02 18:23:56,429 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 41 [2021-05-02 18:23:56,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:56,429 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2021-05-02 18:23:56,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:56,429 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2021-05-02 18:23:56,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 18:23:56,430 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:56,430 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:56,653 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:56,654 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:56,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:56,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1992936486, now seen corresponding path program 5 times [2021-05-02 18:23:56,654 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:56,654 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308946723] [2021-05-02 18:23:56,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:56,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:56,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:56,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:56,861 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 53 proven. 155 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:23:56,861 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:56,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308946723] [2021-05-02 18:23:56,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308946723] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:56,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975456858] [2021-05-02 18:23:56,862 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:57,037 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 18:23:57,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:57,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 18:23:57,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:57,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:57,230 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 53 proven. 155 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:23:57,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975456858] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:57,231 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:57,231 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 18:23:57,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045453061] [2021-05-02 18:23:57,232 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 18:23:57,233 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:57,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 18:23:57,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:23:57,233 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:57,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:57,828 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2021-05-02 18:23:57,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 18:23:57,828 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 18:23:57,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:57,829 INFO L225 Difference]: With dead ends: 52 [2021-05-02 18:23:57,829 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 18:23:57,830 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 43 SyntacticMatches, 7 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 523.0ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:23:57,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 18:23:57,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 18:23:57,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:57,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 18:23:57,833 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2021-05-02 18:23:57,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:57,833 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 18:23:57,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:57,833 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 18:23:57,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 18:23:57,834 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:57,834 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:58,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:23:58,037 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:58,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:58,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1775236534, now seen corresponding path program 6 times [2021-05-02 18:23:58,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:58,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737546383] [2021-05-02 18:23:58,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:58,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:58,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:58,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:58,258 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 58 proven. 187 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:23:58,259 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:58,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737546383] [2021-05-02 18:23:58,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737546383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:58,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763271381] [2021-05-02 18:23:58,259 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:58,403 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-02 18:23:58,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:58,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 18:23:58,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:58,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:58,553 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 85 proven. 7 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:23:58,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1763271381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:58,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:23:58,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6] total 19 [2021-05-02 18:23:58,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233591731] [2021-05-02 18:23:58,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 18:23:58,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:58,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 18:23:58,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:23:58,555 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 19 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 18 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:59,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:59,720 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2021-05-02 18:23:59,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 18:23:59,720 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 18 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 18:23:59,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:59,722 INFO L225 Difference]: With dead ends: 69 [2021-05-02 18:23:59,722 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 18:23:59,723 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 1109.3ms TimeCoverageRelationStatistics Valid=350, Invalid=1210, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 18:23:59,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 18:23:59,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2021-05-02 18:23:59,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 55 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:59,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2021-05-02 18:23:59,728 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 50 [2021-05-02 18:23:59,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:59,728 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2021-05-02 18:23:59,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 18 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:23:59,729 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2021-05-02 18:23:59,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 18:23:59,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:23:59,729 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:23:59,932 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:59,933 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:23:59,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:23:59,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1243479719, now seen corresponding path program 7 times [2021-05-02 18:23:59,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:23:59,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238277176] [2021-05-02 18:23:59,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:23:59,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:00,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:00,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:00,170 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 18:24:00,170 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:00,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238277176] [2021-05-02 18:24:00,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238277176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:00,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [583102962] [2021-05-02 18:24:00,170 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 18:24:00,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:00,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 18:24:00,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:00,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:00,397 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 18:24:00,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [583102962] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:00,397 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:00,397 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 18:24:00,397 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788553518] [2021-05-02 18:24:00,398 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:24:00,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:00,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:24:00,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:24:00,399 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:01,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:01,209 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2021-05-02 18:24:01,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 18:24:01,209 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 18:24:01,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:01,210 INFO L225 Difference]: With dead ends: 64 [2021-05-02 18:24:01,210 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 18:24:01,211 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 647.2ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:24:01,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 18:24:01,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 18:24:01,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 58 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:01,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2021-05-02 18:24:01,214 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 59 [2021-05-02 18:24:01,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:01,215 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2021-05-02 18:24:01,215 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:01,215 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2021-05-02 18:24:01,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 18:24:01,216 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:01,216 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:01,420 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:01,421 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:01,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:01,421 INFO L82 PathProgramCache]: Analyzing trace with hash 165826615, now seen corresponding path program 8 times [2021-05-02 18:24:01,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:01,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716806032] [2021-05-02 18:24:01,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:01,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:01,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:01,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:01,707 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 117 proven. 301 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:24:01,720 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:01,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716806032] [2021-05-02 18:24:01,720 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1716806032] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:01,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179055184] [2021-05-02 18:24:01,720 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 18:24:01,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:24:01,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:01,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 18:24:01,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:01,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:02,004 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:02,004 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1179055184] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:02,004 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:02,004 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 20] total 22 [2021-05-02 18:24:02,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236372461] [2021-05-02 18:24:02,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:24:02,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:02,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:24:02,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=406, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:24:02,007 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand has 22 states, 22 states have (on average 3.0) internal successors, (66), 21 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:03,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:03,140 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2021-05-02 18:24:03,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 18:24:03,141 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.0) internal successors, (66), 21 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 18:24:03,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:03,141 INFO L225 Difference]: With dead ends: 76 [2021-05-02 18:24:03,141 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 18:24:03,142 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 868.0ms TimeCoverageRelationStatistics Valid=143, Invalid=1417, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 18:24:03,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 18:24:03,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-02 18:24:03,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 70 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 18:24:03,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2021-05-02 18:24:03,146 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 62 [2021-05-02 18:24:03,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:03,146 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2021-05-02 18:24:03,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.0) internal successors, (66), 21 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:03,146 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2021-05-02 18:24:03,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 18:24:03,147 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:03,147 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 18, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:03,353 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 18:24:03,353 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:03,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:03,354 INFO L82 PathProgramCache]: Analyzing trace with hash -619469769, now seen corresponding path program 9 times [2021-05-02 18:24:03,354 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:03,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852375708] [2021-05-02 18:24:03,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:03,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:03,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:03,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:03,738 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 149 proven. 495 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:24:03,739 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:03,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852375708] [2021-05-02 18:24:03,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [852375708] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:03,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97593740] [2021-05-02 18:24:03,739 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 18:24:03,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-02 18:24:03,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:03,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:24:03,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:04,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:04,121 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 194 proven. 15 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-05-02 18:24:04,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [97593740] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:04,121 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:04,121 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 7] total 27 [2021-05-02 18:24:04,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375554499] [2021-05-02 18:24:04,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 18:24:04,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:04,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 18:24:04,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=552, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:24:04,123 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand has 27 states, 27 states have (on average 3.074074074074074) internal successors, (83), 26 states have internal predecessors, (83), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:06,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:06,322 INFO L93 Difference]: Finished difference Result 96 states and 104 transitions. [2021-05-02 18:24:06,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 18:24:06,322 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.074074074074074) internal successors, (83), 26 states have internal predecessors, (83), 2 states have call successors, (4), 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 18:24:06,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:06,323 INFO L225 Difference]: With dead ends: 96 [2021-05-02 18:24:06,323 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 18:24:06,324 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 2075.9ms TimeCoverageRelationStatistics Valid=641, Invalid=2665, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 18:24:06,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 18:24:06,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 84. [2021-05-02 18:24:06,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 79 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:06,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2021-05-02 18:24:06,328 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 74 [2021-05-02 18:24:06,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:06,328 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2021-05-02 18:24:06,328 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.074074074074074) internal successors, (83), 26 states have internal predecessors, (83), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:06,328 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2021-05-02 18:24:06,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 18:24:06,329 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:06,329 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 20, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:06,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:24:06,533 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:06,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:06,533 INFO L82 PathProgramCache]: Analyzing trace with hash -215206778, now seen corresponding path program 10 times [2021-05-02 18:24:06,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:06,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052886407] [2021-05-02 18:24:06,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:06,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:06,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:06,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:06,974 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 227 proven. 610 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:24:06,974 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:06,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052886407] [2021-05-02 18:24:06,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052886407] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:06,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906419053] [2021-05-02 18:24:06,974 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 18:24:07,030 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:24:07,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:07,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 18:24:07,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:07,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:07,240 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 227 proven. 610 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:24:07,240 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906419053] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:07,240 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:07,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 18:24:07,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585294688] [2021-05-02 18:24:07,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:24:07,241 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:07,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:24:07,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:24:07,242 INFO L87 Difference]: Start difference. First operand 84 states and 88 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 18:24:08,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:08,469 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2021-05-02 18:24:08,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 18:24:08,470 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 83 [2021-05-02 18:24:08,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:08,470 INFO L225 Difference]: With dead ends: 88 [2021-05-02 18:24:08,470 INFO L226 Difference]: Without dead ends: 88 [2021-05-02 18:24:08,471 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 997.7ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:24:08,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-02 18:24:08,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2021-05-02 18:24:08,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0609756097560976) internal successors, (87), 82 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:08,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 91 transitions. [2021-05-02 18:24:08,476 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 91 transitions. Word has length 83 [2021-05-02 18:24:08,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:08,477 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 91 transitions. [2021-05-02 18:24:08,477 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 18:24:08,477 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 91 transitions. [2021-05-02 18:24:08,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 18:24:08,478 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:08,478 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 21, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:08,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:24:08,689 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:08,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:08,689 INFO L82 PathProgramCache]: Analyzing trace with hash 1249433110, now seen corresponding path program 11 times [2021-05-02 18:24:08,689 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:08,689 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039195106] [2021-05-02 18:24:08,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:08,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:09,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:09,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:09,092 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 238 proven. 672 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:24:09,092 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:09,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039195106] [2021-05-02 18:24:09,093 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2039195106] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:09,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927695371] [2021-05-02 18:24:09,093 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 18:24:11,269 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 26 check-sat command(s) [2021-05-02 18:24:11,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:11,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 18:24:11,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:11,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:11,582 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 181 proven. 737 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:24:11,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927695371] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:11,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:11,582 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 27 [2021-05-02 18:24:11,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576521711] [2021-05-02 18:24:11,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 18:24:11,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:11,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 18:24:11,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=629, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:24:11,584 INFO L87 Difference]: Start difference. First operand 87 states and 91 transitions. Second operand has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:13,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:13,024 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2021-05-02 18:24:13,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:24:13,025 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-05-02 18:24:13,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:13,025 INFO L225 Difference]: With dead ends: 94 [2021-05-02 18:24:13,025 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 18:24:13,026 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 80 SyntacticMatches, 8 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 1172.2ms TimeCoverageRelationStatistics Valid=187, Invalid=2263, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:24:13,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 18:24:13,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-05-02 18:24:13,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0568181818181819) internal successors, (93), 88 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:13,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2021-05-02 18:24:13,032 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 86 [2021-05-02 18:24:13,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:13,032 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2021-05-02 18:24:13,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:13,033 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2021-05-02 18:24:13,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 18:24:13,034 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:13,034 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 23, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:13,239 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:13,240 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:13,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:13,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1540407274, now seen corresponding path program 12 times [2021-05-02 18:24:13,240 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:13,240 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251133868] [2021-05-02 18:24:13,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:13,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:13,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:13,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:13,682 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 260 proven. 805 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:24:13,683 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:13,683 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251133868] [2021-05-02 18:24:13,683 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251133868] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:13,683 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252868196] [2021-05-02 18:24:13,683 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 18:24:13,947 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 18:24:13,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:13,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:24:13,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:14,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:14,848 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 317 proven. 26 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2021-05-02 18:24:14,849 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252868196] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:14,849 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:14,849 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 9] total 34 [2021-05-02 18:24:14,849 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94708182] [2021-05-02 18:24:14,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 18:24:14,850 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:14,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 18:24:14,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=987, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:24:14,850 INFO L87 Difference]: Start difference. First operand 93 states and 97 transitions. Second operand has 34 states, 34 states have (on average 2.9705882352941178) internal successors, (101), 33 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 18:24:17,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:17,096 INFO L93 Difference]: Finished difference Result 105 states and 107 transitions. [2021-05-02 18:24:17,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:24:17,096 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.9705882352941178) internal successors, (101), 33 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 18:24:17,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:17,097 INFO L225 Difference]: With dead ends: 105 [2021-05-02 18:24:17,097 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 18:24:17,098 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 86 SyntacticMatches, 7 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 549 ImplicationChecksByTransitivity, 2327.2ms TimeCoverageRelationStatistics Valid=430, Invalid=3860, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:24:17,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 18:24:17,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 103. [2021-05-02 18:24:17,100 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 18:24:17,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 18:24:17,101 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 92 [2021-05-02 18:24:17,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:17,101 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 18:24:17,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.9705882352941178) internal successors, (101), 33 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 18:24:17,102 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 18:24:17,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 18:24:17,102 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:17,102 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 25, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:17,306 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 18:24:17,306 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:17,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:17,307 INFO L82 PathProgramCache]: Analyzing trace with hash -983394233, now seen corresponding path program 13 times [2021-05-02 18:24:17,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:17,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [414248844] [2021-05-02 18:24:17,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:17,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:17,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:17,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:17,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 359 proven. 950 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:24:17,854 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:17,854 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [414248844] [2021-05-02 18:24:17,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [414248844] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:17,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304882871] [2021-05-02 18:24:17,855 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 18:24:17,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:17,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 18:24:17,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:18,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:18,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 359 proven. 950 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:24:18,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304882871] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:18,145 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:18,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 18:24:18,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014768934] [2021-05-02 18:24:18,145 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:24:18,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:18,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:24:18,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:24:18,146 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:19,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:19,894 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2021-05-02 18:24:19,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 18:24:19,895 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 18:24:19,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:19,895 INFO L225 Difference]: With dead ends: 107 [2021-05-02 18:24:19,895 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 18:24:19,896 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 1347.9ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:24:19,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 18:24:19,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-02 18:24:19,898 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 18:24:19,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2021-05-02 18:24:19,898 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 101 [2021-05-02 18:24:19,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:19,899 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2021-05-02 18:24:19,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:19,899 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2021-05-02 18:24:19,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 18:24:19,900 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:19,900 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 26, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:20,116 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:24:20,117 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:20,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:20,118 INFO L82 PathProgramCache]: Analyzing trace with hash 956298711, now seen corresponding path program 14 times [2021-05-02 18:24:20,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:20,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536562689] [2021-05-02 18:24:20,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:20,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:20,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:20,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:20,687 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 373 proven. 1027 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:24:20,687 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:20,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536562689] [2021-05-02 18:24:20,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1536562689] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:20,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445281801] [2021-05-02 18:24:20,688 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:20,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:24:20,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:20,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 18:24:20,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:21,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:21,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 0 proven. 1426 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:21,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [445281801] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:21,142 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:21,142 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 34] total 36 [2021-05-02 18:24:21,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637764180] [2021-05-02 18:24:21,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 18:24:21,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:21,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 18:24:21,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1164, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:24:21,143 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand has 36 states, 36 states have (on average 3.0) internal successors, (108), 35 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:23,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:23,419 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-05-02 18:24:23,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:24:23,419 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0) internal successors, (108), 35 states have internal predecessors, (108), 2 states have call successors, (4), 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 18:24:23,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:23,420 INFO L225 Difference]: With dead ends: 125 [2021-05-02 18:24:23,420 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 18:24:23,421 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 1727.6ms TimeCoverageRelationStatistics Valid=251, Invalid=4305, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 18:24:23,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 18:24:23,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-05-02 18:24:23,424 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 18:24:23,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2021-05-02 18:24:23,424 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 104 [2021-05-02 18:24:23,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:23,425 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2021-05-02 18:24:23,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.0) internal successors, (108), 35 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:23,425 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2021-05-02 18:24:23,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-02 18:24:23,426 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:23,426 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 32, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:23,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:23,648 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:23,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:23,649 INFO L82 PathProgramCache]: Analyzing trace with hash -815189033, now seen corresponding path program 15 times [2021-05-02 18:24:23,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:23,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599993086] [2021-05-02 18:24:23,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:23,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:24,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:24,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:24,465 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 457 proven. 1552 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:24:24,465 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:24,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599993086] [2021-05-02 18:24:24,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599993086] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:24,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002870844] [2021-05-02 18:24:24,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:24,633 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 18:24:24,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:24,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 18:24:24,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:25,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:25,134 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 538 proven. 40 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2021-05-02 18:24:25,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002870844] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:25,134 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:25,134 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 9] total 43 [2021-05-02 18:24:25,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780024326] [2021-05-02 18:24:25,135 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 18:24:25,135 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:25,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 18:24:25,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=1487, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 18:24:25,136 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 43 states, 43 states have (on average 3.046511627906977) internal successors, (131), 42 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 18:24:30,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:30,223 INFO L93 Difference]: Finished difference Result 150 states and 158 transitions. [2021-05-02 18:24:30,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 18:24:30,223 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.046511627906977) internal successors, (131), 42 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 18:24:30,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:30,224 INFO L225 Difference]: With dead ends: 150 [2021-05-02 18:24:30,224 INFO L226 Difference]: Without dead ends: 150 [2021-05-02 18:24:30,225 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1263 ImplicationChecksByTransitivity, 4868.9ms TimeCoverageRelationStatistics Valid=1436, Invalid=7306, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 18:24:30,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-02 18:24:30,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 132. [2021-05-02 18:24:30,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 127 states have (on average 1.0236220472440944) internal successors, (130), 127 states have internal predecessors, (130), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:30,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 134 transitions. [2021-05-02 18:24:30,228 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 134 transitions. Word has length 122 [2021-05-02 18:24:30,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:30,229 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 134 transitions. [2021-05-02 18:24:30,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 3.046511627906977) internal successors, (131), 42 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 18:24:30,229 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 134 transitions. [2021-05-02 18:24:30,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 18:24:30,229 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:30,230 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 34, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:30,433 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:30,433 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:30,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:30,434 INFO L82 PathProgramCache]: Analyzing trace with hash -1581448986, now seen corresponding path program 16 times [2021-05-02 18:24:30,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:30,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301247665] [2021-05-02 18:24:30,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:30,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:31,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:31,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:31,366 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 589 proven. 1751 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:24:31,367 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:31,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301247665] [2021-05-02 18:24:31,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301247665] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:31,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [265503305] [2021-05-02 18:24:31,367 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:31,439 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:24:31,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:31,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 72 conjunts are in the unsatisfiable core [2021-05-02 18:24:31,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:31,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:31,721 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 589 proven. 1751 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:24:31,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [265503305] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:31,721 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:31,721 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-02 18:24:31,721 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076783366] [2021-05-02 18:24:31,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 18:24:31,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:31,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 18:24:31,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 18:24:31,723 INFO L87 Difference]: Start difference. First operand 132 states and 134 transitions. Second operand has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:34,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:34,517 INFO L93 Difference]: Finished difference Result 136 states and 138 transitions. [2021-05-02 18:24:34,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 18:24:34,517 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-02 18:24:34,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:34,518 INFO L225 Difference]: With dead ends: 136 [2021-05-02 18:24:34,518 INFO L226 Difference]: Without dead ends: 136 [2021-05-02 18:24:34,519 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 600 ImplicationChecksByTransitivity, 2155.3ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 18:24:34,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-02 18:24:34,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2021-05-02 18:24:34,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:34,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-02 18:24:34,528 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 131 [2021-05-02 18:24:34,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:34,528 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-02 18:24:34,528 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:34,528 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-02 18:24:34,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-02 18:24:34,529 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:34,529 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 35, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:34,732 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:34,733 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:34,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:34,733 INFO L82 PathProgramCache]: Analyzing trace with hash -129351050, now seen corresponding path program 17 times [2021-05-02 18:24:34,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:34,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556262601] [2021-05-02 18:24:34,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:34,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:35,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:35,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:35,548 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 606 proven. 1855 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:24:35,548 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:35,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556262601] [2021-05-02 18:24:35,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556262601] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:35,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286429045] [2021-05-02 18:24:35,549 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:49,983 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2021-05-02 18:24:49,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:49,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 80 conjunts are in the unsatisfiable core [2021-05-02 18:24:49,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:50,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:50,472 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 309 proven. 2185 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:24:50,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286429045] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:50,473 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:50,473 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 41] total 43 [2021-05-02 18:24:50,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704171189] [2021-05-02 18:24:50,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 18:24:50,473 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:50,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 18:24:50,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1687, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 18:24:50,474 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:53,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:53,722 INFO L93 Difference]: Finished difference Result 148 states and 150 transitions. [2021-05-02 18:24:53,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 18:24:53,724 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 2 states have call successors, (4), 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 18:24:53,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:53,725 INFO L225 Difference]: With dead ends: 148 [2021-05-02 18:24:53,725 INFO L226 Difference]: Without dead ends: 148 [2021-05-02 18:24:53,726 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 2413.0ms TimeCoverageRelationStatistics Valid=311, Invalid=6331, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 18:24:53,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-02 18:24:53,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2021-05-02 18:24:53,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:53,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2021-05-02 18:24:53,729 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 134 [2021-05-02 18:24:53,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:53,729 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2021-05-02 18:24:53,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:53,729 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2021-05-02 18:24:53,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-02 18:24:53,730 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:53,730 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 39, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:53,936 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 18:24:53,937 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:53,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:53,937 INFO L82 PathProgramCache]: Analyzing trace with hash -397961610, now seen corresponding path program 18 times [2021-05-02 18:24:53,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:53,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187229255] [2021-05-02 18:24:53,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:53,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:54,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:54,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:54,926 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 674 proven. 2301 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:24:54,927 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:54,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187229255] [2021-05-02 18:24:54,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187229255] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:54,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312353651] [2021-05-02 18:24:54,927 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:55,290 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2021-05-02 18:24:55,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:55,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 18:24:55,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:55,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:55,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:55,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:56,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:56,750 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 773 proven. 57 refuted. 0 times theorem prover too weak. 2185 trivial. 0 not checked. [2021-05-02 18:24:56,750 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312353651] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:56,750 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:56,750 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 11] total 52 [2021-05-02 18:24:56,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096050952] [2021-05-02 18:24:56,750 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 18:24:56,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:56,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 18:24:56,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=2360, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 18:24:56,752 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand has 52 states, 52 states have (on average 2.980769230769231) internal successors, (155), 51 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:03,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:03,658 INFO L93 Difference]: Finished difference Result 165 states and 169 transitions. [2021-05-02 18:25:03,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 18:25:03,658 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.980769230769231) internal successors, (155), 51 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2021-05-02 18:25:03,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:03,659 INFO L225 Difference]: With dead ends: 165 [2021-05-02 18:25:03,659 INFO L226 Difference]: Without dead ends: 165 [2021-05-02 18:25:03,660 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 140 SyntacticMatches, 7 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1516 ImplicationChecksByTransitivity, 6279.2ms TimeCoverageRelationStatistics Valid=1049, Invalid=10081, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 18:25:03,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-05-02 18:25:03,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 157. [2021-05-02 18:25:03,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:03,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-02 18:25:03,662 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 146 [2021-05-02 18:25:03,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:03,663 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-02 18:25:03,663 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 2.980769230769231) internal successors, (155), 51 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:03,663 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-02 18:25:03,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-02 18:25:03,663 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:03,663 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 41, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:03,867 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 18:25:03,867 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:03,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:03,868 INFO L82 PathProgramCache]: Analyzing trace with hash -388913689, now seen corresponding path program 19 times [2021-05-02 18:25:03,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:03,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478838132] [2021-05-02 18:25:03,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:03,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:05,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:05,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:05,066 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 833 proven. 2542 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:25:05,066 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:05,067 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478838132] [2021-05-02 18:25:05,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478838132] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:05,067 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709213484] [2021-05-02 18:25:05,067 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 18:25:05,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:05,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 86 conjunts are in the unsatisfiable core [2021-05-02 18:25:05,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:05,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:05,487 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 833 proven. 2542 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:25:05,487 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709213484] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:05,487 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:05,487 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-02 18:25:05,487 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099242864] [2021-05-02 18:25:05,488 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 18:25:05,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:05,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 18:25:05,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:25:05,489 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:09,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:09,381 INFO L93 Difference]: Finished difference Result 161 states and 163 transitions. [2021-05-02 18:25:09,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 18:25:09,382 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-02 18:25:09,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:09,383 INFO L225 Difference]: With dead ends: 161 [2021-05-02 18:25:09,383 INFO L226 Difference]: Without dead ends: 161 [2021-05-02 18:25:09,383 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 866 ImplicationChecksByTransitivity, 2824.4ms TimeCoverageRelationStatistics Valid=341, Invalid=7315, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 18:25:09,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-02 18:25:09,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2021-05-02 18:25:09,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.0193548387096774) internal successors, (158), 155 states have internal predecessors, (158), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:09,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 162 transitions. [2021-05-02 18:25:09,386 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 162 transitions. Word has length 155 [2021-05-02 18:25:09,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:09,386 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 162 transitions. [2021-05-02 18:25:09,387 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:09,387 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 162 transitions. [2021-05-02 18:25:09,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-05-02 18:25:09,387 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:09,387 INFO L523 BasicCegarLoop]: trace histogram [49, 49, 42, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:09,593 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:09,593 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:09,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:09,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1192703863, now seen corresponding path program 20 times [2021-05-02 18:25:09,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:09,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458815885] [2021-05-02 18:25:09,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:09,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:10,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:10,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:10,726 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 853 proven. 2667 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:25:10,726 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:10,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458815885] [2021-05-02 18:25:10,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458815885] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:10,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510030726] [2021-05-02 18:25:10,726 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 18:25:10,795 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:25:10,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:10,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 18:25:10,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:11,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:11,453 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 0 proven. 3577 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:25:11,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510030726] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:11,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:11,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 52] total 54 [2021-05-02 18:25:11,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302424956] [2021-05-02 18:25:11,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 18:25:11,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:11,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 18:25:11,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=2714, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:25:11,455 INFO L87 Difference]: Start difference. First operand 160 states and 162 transitions. Second operand has 54 states, 54 states have (on average 3.0) internal successors, (162), 53 states have internal predecessors, (162), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:16,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:16,780 INFO L93 Difference]: Finished difference Result 185 states and 187 transitions. [2021-05-02 18:25:16,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 18:25:16,781 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.0) internal successors, (162), 53 states have internal predecessors, (162), 2 states have call successors, (4), 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 158 [2021-05-02 18:25:16,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:16,782 INFO L225 Difference]: With dead ends: 185 [2021-05-02 18:25:16,782 INFO L226 Difference]: Without dead ends: 185 [2021-05-02 18:25:16,783 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 153 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1250 ImplicationChecksByTransitivity, 3505.0ms TimeCoverageRelationStatistics Valid=391, Invalid=10321, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 18:25:16,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-02 18:25:16,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-05-02 18:25:16,786 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 18:25:16,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 186 transitions. [2021-05-02 18:25:16,786 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 186 transitions. Word has length 158 [2021-05-02 18:25:16,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:16,787 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 186 transitions. [2021-05-02 18:25:16,787 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 3.0) internal successors, (162), 53 states have internal predecessors, (162), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:16,787 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 186 transitions. [2021-05-02 18:25:16,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-02 18:25:16,788 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:16,788 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 50, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:16,993 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 18:25:16,993 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:16,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:16,993 INFO L82 PathProgramCache]: Analyzing trace with hash -1338253449, now seen corresponding path program 21 times [2021-05-02 18:25:16,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:16,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642465398] [2021-05-02 18:25:16,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:17,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:18,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:18,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:18,583 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1013 proven. 3775 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:25:18,583 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:18,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642465398] [2021-05-02 18:25:18,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1642465398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:18,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975081940] [2021-05-02 18:25:18,583 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 18:25:18,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-05-02 18:25:18,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:18,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:25:18,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:19,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:19,712 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1142 proven. 77 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2021-05-02 18:25:19,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [975081940] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:19,712 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:19,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 12] total 64 [2021-05-02 18:25:19,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705933838] [2021-05-02 18:25:19,713 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 18:25:19,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:19,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 18:25:19,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=3483, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 18:25:19,714 INFO L87 Difference]: Start difference. First operand 184 states and 186 transitions. Second operand has 64 states, 64 states have (on average 2.984375) internal successors, (191), 63 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 18:25:25,929 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 40 [2021-05-02 18:25:27,050 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 40 [2021-05-02 18:25:28,964 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 42 [2021-05-02 18:25:34,209 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 40 [2021-05-02 18:25:34,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:34,210 INFO L93 Difference]: Finished difference Result 213 states and 221 transitions. [2021-05-02 18:25:34,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-02 18:25:34,210 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.984375) internal successors, (191), 63 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 18:25:34,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:34,211 INFO L225 Difference]: With dead ends: 213 [2021-05-02 18:25:34,211 INFO L226 Difference]: Without dead ends: 213 [2021-05-02 18:25:34,213 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 182 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2733 ImplicationChecksByTransitivity, 13312.9ms TimeCoverageRelationStatistics Valid=2215, Invalid=16691, Unknown=0, NotChecked=0, Total=18906 [2021-05-02 18:25:34,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-05-02 18:25:34,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 193. [2021-05-02 18:25:34,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:34,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-05-02 18:25:34,216 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 182 [2021-05-02 18:25:34,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:34,217 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-05-02 18:25:34,217 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 2.984375) internal successors, (191), 63 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 18:25:34,217 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-05-02 18:25:34,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-02 18:25:34,218 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:34,218 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 52, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:34,421 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:34,421 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:34,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:34,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1822044486, now seen corresponding path program 22 times [2021-05-02 18:25:34,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:34,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287299287] [2021-05-02 18:25:34,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:34,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:36,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:36,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:36,178 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1211 proven. 4082 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:25:36,178 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:36,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287299287] [2021-05-02 18:25:36,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [287299287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:36,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581905805] [2021-05-02 18:25:36,178 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 18:25:36,262 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:25:36,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:36,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 108 conjunts are in the unsatisfiable core [2021-05-02 18:25:36,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:36,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:36,716 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1211 proven. 4082 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:25:36,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581905805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:36,716 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:36,716 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55] total 57 [2021-05-02 18:25:36,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192508666] [2021-05-02 18:25:36,717 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 18:25:36,717 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:36,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 18:25:36,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3028, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 18:25:36,718 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:42,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:42,972 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2021-05-02 18:25:42,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 18:25:42,973 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 2 states have call successors, (4), 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 18:25:42,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:42,974 INFO L225 Difference]: With dead ends: 197 [2021-05-02 18:25:42,974 INFO L226 Difference]: Without dead ends: 197 [2021-05-02 18:25:42,975 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 192 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1383 ImplicationChecksByTransitivity, 4116.1ms TimeCoverageRelationStatistics Valid=429, Invalid=11561, Unknown=0, NotChecked=0, Total=11990 [2021-05-02 18:25:42,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-02 18:25:42,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2021-05-02 18:25:42,978 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 18:25:42,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2021-05-02 18:25:42,979 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 191 [2021-05-02 18:25:42,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:42,979 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2021-05-02 18:25:42,979 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:42,979 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2021-05-02 18:25:42,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-05-02 18:25:42,980 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:42,980 INFO L523 BasicCegarLoop]: trace histogram [61, 61, 53, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:43,202 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 18:25:43,203 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:43,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:43,203 INFO L82 PathProgramCache]: Analyzing trace with hash -376292650, now seen corresponding path program 23 times [2021-05-02 18:25:43,203 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:43,203 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227786807] [2021-05-02 18:25:43,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:43,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:44,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:44,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:44,967 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1234 proven. 4240 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:25:44,967 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:44,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227786807] [2021-05-02 18:25:44,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227786807] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:44,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1372568363] [2021-05-02 18:25:44,967 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 18:27:46,049 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 62 check-sat command(s) [2021-05-02 18:27:46,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:27:46,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 158 conjunts are in the unsatisfiable core [2021-05-02 18:27:46,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:27:47,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:27:48,015 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 946 proven. 4565 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:27:48,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1372568363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:27:48,015 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:27:48,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 58] total 60 [2021-05-02 18:27:48,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579828471] [2021-05-02 18:27:48,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 18:27:48,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:27:48,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 18:27:48,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=3369, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 18:27:48,017 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand has 60 states, 60 states have (on average 3.0166666666666666) internal successors, (181), 59 states have internal predecessors, (181), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:27:55,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:27:55,226 INFO L93 Difference]: Finished difference Result 206 states and 208 transitions. [2021-05-02 18:27:55,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 18:27:55,226 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.0166666666666666) internal successors, (181), 59 states have internal predecessors, (181), 2 states have call successors, (4), 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 194 [2021-05-02 18:27:55,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:27:55,227 INFO L225 Difference]: With dead ends: 206 [2021-05-02 18:27:55,227 INFO L226 Difference]: Without dead ends: 206 [2021-05-02 18:27:55,228 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 149 SyntacticMatches, 46 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1640 ImplicationChecksByTransitivity, 5935.6ms TimeCoverageRelationStatistics Valid=449, Invalid=12891, Unknown=0, NotChecked=0, Total=13340 [2021-05-02 18:27:55,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-02 18:27:55,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2021-05-02 18:27:55,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:27:55,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2021-05-02 18:27:55,232 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 194 [2021-05-02 18:27:55,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:27:55,232 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2021-05-02 18:27:55,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 3.0166666666666666) internal successors, (181), 59 states have internal predecessors, (181), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:27:55,233 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2021-05-02 18:27:55,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-05-02 18:27:55,233 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:27:55,234 INFO L523 BasicCegarLoop]: trace histogram [64, 64, 56, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:27:55,444 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:27:55,445 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:27:55,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:27:55,445 INFO L82 PathProgramCache]: Analyzing trace with hash 47406406, now seen corresponding path program 24 times [2021-05-02 18:27:55,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:27:55,445 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112270804] [2021-05-02 18:27:55,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:27:55,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:57,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:27:57,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:27:57,654 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 1303 proven. 4732 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:27:57,654 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:27:57,654 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112270804] [2021-05-02 18:27:57,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112270804] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:27:57,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832597095] [2021-05-02 18:27:57,655 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 18:27:58,731 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 27 check-sat command(s) [2021-05-02 18:27:58,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:27:58,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 18:27:58,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:27:58,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:01,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:01,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:04,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:04,482 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 1840 proven. 1209 refuted. 0 times theorem prover too weak. 3063 trivial. 0 not checked. [2021-05-02 18:28:04,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832597095] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:04,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:28:04,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 29] total 87 [2021-05-02 18:28:04,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430892138] [2021-05-02 18:28:04,483 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-02 18:28:04,483 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:28:04,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-02 18:28:04,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1250, Invalid=6232, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 18:28:04,484 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 87 states, 87 states have (on average 2.7586206896551726) internal successors, (240), 86 states have internal predecessors, (240), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:14,543 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 40 [2021-05-02 18:28:15,043 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:28:20,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:28:20,694 INFO L93 Difference]: Finished difference Result 243 states and 254 transitions. [2021-05-02 18:28:20,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-02 18:28:20,694 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 2.7586206896551726) internal successors, (240), 86 states have internal predecessors, (240), 2 states have call successors, (4), 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 203 [2021-05-02 18:28:20,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:28:20,695 INFO L225 Difference]: With dead ends: 243 [2021-05-02 18:28:20,695 INFO L226 Difference]: Without dead ends: 243 [2021-05-02 18:28:20,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 174 SyntacticMatches, 14 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5053 ImplicationChecksByTransitivity, 17384.0ms TimeCoverageRelationStatistics Valid=4057, Invalid=26045, Unknown=0, NotChecked=0, Total=30102 [2021-05-02 18:28:20,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-05-02 18:28:20,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 214. [2021-05-02 18:28:20,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 209 states have (on average 1.014354066985646) internal successors, (212), 209 states have internal predecessors, (212), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:20,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 216 transitions. [2021-05-02 18:28:20,700 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 216 transitions. Word has length 203 [2021-05-02 18:28:20,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:28:20,701 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 216 transitions. [2021-05-02 18:28:20,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 87 states, 87 states have (on average 2.7586206896551726) internal successors, (240), 86 states have internal predecessors, (240), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:20,701 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 216 transitions. [2021-05-02 18:28:20,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-05-02 18:28:20,702 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:28:20,702 INFO L523 BasicCegarLoop]: trace histogram [67, 67, 58, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:28:20,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:28:20,907 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:28:20,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:28:20,908 INFO L82 PathProgramCache]: Analyzing trace with hash 2026029335, now seen corresponding path program 25 times [2021-05-02 18:28:20,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:28:20,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467329554] [2021-05-02 18:28:20,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:28:20,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:23,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:28:23,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:23,279 INFO L134 CoverageAnalysis]: Checked inductivity of 6700 backedges. 1525 proven. 5075 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:28:23,279 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:28:23,279 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467329554] [2021-05-02 18:28:23,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467329554] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:23,279 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783174892] [2021-05-02 18:28:23,280 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 18:28:23,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:23,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 120 conjunts are in the unsatisfiable core [2021-05-02 18:28:23,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:28:24,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:24,072 INFO L134 CoverageAnalysis]: Checked inductivity of 6700 backedges. 1525 proven. 5075 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:28:24,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783174892] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:24,072 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:28:24,072 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61] total 63 [2021-05-02 18:28:24,072 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241886759] [2021-05-02 18:28:24,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 18:28:24,073 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:28:24,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 18:28:24,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=3724, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 18:28:24,074 INFO L87 Difference]: Start difference. First operand 214 states and 216 transitions. Second operand has 63 states, 63 states have (on average 3.015873015873016) internal successors, (190), 62 states have internal predecessors, (190), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:33,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:28:33,101 INFO L93 Difference]: Finished difference Result 218 states and 220 transitions. [2021-05-02 18:28:33,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 18:28:33,102 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.015873015873016) internal successors, (190), 62 states have internal predecessors, (190), 2 states have call successors, (4), 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 212 [2021-05-02 18:28:33,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:28:33,103 INFO L225 Difference]: With dead ends: 218 [2021-05-02 18:28:33,103 INFO L226 Difference]: Without dead ends: 218 [2021-05-02 18:28:33,104 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 213 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1716 ImplicationChecksByTransitivity, 5745.3ms TimeCoverageRelationStatistics Valid=477, Invalid=14285, Unknown=0, NotChecked=0, Total=14762 [2021-05-02 18:28:33,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-05-02 18:28:33,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 217. [2021-05-02 18:28:33,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 states have internal predecessors, (215), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:33,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2021-05-02 18:28:33,108 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 212 [2021-05-02 18:28:33,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:28:33,109 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2021-05-02 18:28:33,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 3.015873015873016) internal successors, (190), 62 states have internal predecessors, (190), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:33,109 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2021-05-02 18:28:33,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-05-02 18:28:33,110 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:28:33,110 INFO L523 BasicCegarLoop]: trace histogram [68, 68, 59, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:28:33,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:28:33,325 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:28:33,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:28:33,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1517071993, now seen corresponding path program 26 times [2021-05-02 18:28:33,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:28:33,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193328426] [2021-05-02 18:28:33,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:28:33,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:35,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:28:35,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:35,837 INFO L134 CoverageAnalysis]: Checked inductivity of 6902 backedges. 1551 proven. 5251 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:28:35,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:28:35,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193328426] [2021-05-02 18:28:35,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193328426] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:35,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627491388] [2021-05-02 18:28:35,838 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 18:28:35,944 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:28:35,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:28:35,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 139 conjunts are in the unsatisfiable core [2021-05-02 18:28:35,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:28:37,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:37,128 INFO L134 CoverageAnalysis]: Checked inductivity of 6902 backedges. 0 proven. 6902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:28:37,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627491388] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:37,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:28:37,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 71] total 73 [2021-05-02 18:28:37,129 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705871532] [2021-05-02 18:28:37,129 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-02 18:28:37,129 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:28:37,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-02 18:28:37,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=5053, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 18:28:37,130 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand has 73 states, 73 states have (on average 3.0) internal successors, (219), 72 states have internal predecessors, (219), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:48,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:28:48,880 INFO L93 Difference]: Finished difference Result 248 states and 250 transitions. [2021-05-02 18:28:48,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-02 18:28:48,881 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.0) internal successors, (219), 72 states have internal predecessors, (219), 2 states have call successors, (4), 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 215 [2021-05-02 18:28:48,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:28:48,882 INFO L225 Difference]: With dead ends: 248 [2021-05-02 18:28:48,882 INFO L226 Difference]: Without dead ends: 248 [2021-05-02 18:28:48,883 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 208 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2377 ImplicationChecksByTransitivity, 7621.1ms TimeCoverageRelationStatistics Valid=539, Invalid=19483, Unknown=0, NotChecked=0, Total=20022 [2021-05-02 18:28:48,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-05-02 18:28:48,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 247. [2021-05-02 18:28:48,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 242 states have (on average 1.012396694214876) internal successors, (245), 242 states have internal predecessors, (245), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:48,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 249 transitions. [2021-05-02 18:28:48,887 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 249 transitions. Word has length 215 [2021-05-02 18:28:48,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:28:48,887 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 249 transitions. [2021-05-02 18:28:48,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 3.0) internal successors, (219), 72 states have internal predecessors, (219), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:28:48,888 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 249 transitions. [2021-05-02 18:28:48,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2021-05-02 18:28:48,889 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:28:48,889 INFO L523 BasicCegarLoop]: trace histogram [78, 78, 69, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:28:49,105 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 18:28:49,105 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:28:49,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:28:49,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1815117703, now seen corresponding path program 27 times [2021-05-02 18:28:49,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:28:49,105 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074725903] [2021-05-02 18:28:49,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:28:49,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:52,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:28:52,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:28:52,420 INFO L134 CoverageAnalysis]: Checked inductivity of 9087 backedges. 1811 proven. 7176 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:28:52,420 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:28:52,420 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074725903] [2021-05-02 18:28:52,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074725903] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:52,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021244772] [2021-05-02 18:28:52,421 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 18:28:52,617 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-02 18:28:52,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:28:52,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 18:28:52,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:28:55,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:28:55,226 INFO L134 CoverageAnalysis]: Checked inductivity of 9087 backedges. 1991 proven. 126 refuted. 0 times theorem prover too weak. 6970 trivial. 0 not checked. [2021-05-02 18:28:55,227 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021244772] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:28:55,227 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:28:55,227 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 14] total 85 [2021-05-02 18:28:55,227 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993502199] [2021-05-02 18:28:55,227 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-02 18:28:55,227 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:28:55,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-02 18:28:55,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=823, Invalid=6317, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 18:28:55,229 INFO L87 Difference]: Start difference. First operand 247 states and 249 transitions. Second operand has 85 states, 85 states have (on average 2.988235294117647) internal successors, (254), 84 states have internal predecessors, (254), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:29:08,874 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 45 [2021-05-02 18:29:09,893 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 40 [2021-05-02 18:29:10,713 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:29:12,650 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 40 [2021-05-02 18:29:15,149 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 42 [2021-05-02 18:29:18,162 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 42 [2021-05-02 18:29:20,899 WARN L205 SmtUtils]: Spent 434.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 42 [2021-05-02 18:29:22,685 WARN L205 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 42 [2021-05-02 18:29:24,490 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 42 [2021-05-02 18:29:25,782 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 18:29:26,970 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 42 [2021-05-02 18:29:31,359 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 42 [2021-05-02 18:29:32,080 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 40 [2021-05-02 18:29:32,739 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:29:33,572 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 40 [2021-05-02 18:29:34,382 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:29:35,352 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 40 [2021-05-02 18:29:35,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:29:35,354 INFO L93 Difference]: Finished difference Result 279 states and 288 transitions. [2021-05-02 18:29:35,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-02 18:29:35,354 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 2.988235294117647) internal successors, (254), 84 states have internal predecessors, (254), 2 states have call successors, (4), 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 245 [2021-05-02 18:29:35,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:29:35,355 INFO L225 Difference]: With dead ends: 279 [2021-05-02 18:29:35,355 INFO L226 Difference]: Without dead ends: 279 [2021-05-02 18:29:35,357 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 243 SyntacticMatches, 3 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4718 ImplicationChecksByTransitivity, 36477.3ms TimeCoverageRelationStatistics Valid=3303, Invalid=29639, Unknown=0, NotChecked=0, Total=32942 [2021-05-02 18:29:35,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2021-05-02 18:29:35,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 256. [2021-05-02 18:29:35,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 251 states have (on average 1.0119521912350598) internal successors, (254), 251 states have internal predecessors, (254), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:29:35,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 258 transitions. [2021-05-02 18:29:35,362 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 258 transitions. Word has length 245 [2021-05-02 18:29:35,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:29:35,362 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 258 transitions. [2021-05-02 18:29:35,363 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 85 states, 85 states have (on average 2.988235294117647) internal successors, (254), 84 states have internal predecessors, (254), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:29:35,363 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 258 transitions. [2021-05-02 18:29:35,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2021-05-02 18:29:35,364 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:29:35,364 INFO L523 BasicCegarLoop]: trace histogram [81, 81, 71, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:29:35,569 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:29:35,569 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:29:35,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:29:35,570 INFO L82 PathProgramCache]: Analyzing trace with hash -172790986, now seen corresponding path program 28 times [2021-05-02 18:29:35,570 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:29:35,570 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154847162] [2021-05-02 18:29:35,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:29:35,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:29:40,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:29:40,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:29:40,031 INFO L134 CoverageAnalysis]: Checked inductivity of 9801 backedges. 2078 proven. 7597 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:29:40,031 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:29:40,031 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154847162] [2021-05-02 18:29:40,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154847162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:29:40,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142975347] [2021-05-02 18:29:40,032 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 18:29:40,159 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:29:40,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:29:40,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 573 conjuncts, 146 conjunts are in the unsatisfiable core [2021-05-02 18:29:40,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:29:41,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:29:41,115 INFO L134 CoverageAnalysis]: Checked inductivity of 9801 backedges. 2078 proven. 7597 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:29:41,115 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142975347] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:29:41,115 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:29:41,116 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74] total 76 [2021-05-02 18:29:41,116 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73091015] [2021-05-02 18:29:41,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-02 18:29:41,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:29:41,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-02 18:29:41,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=5479, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 18:29:41,117 INFO L87 Difference]: Start difference. First operand 256 states and 258 transitions. Second operand has 76 states, 76 states have (on average 3.013157894736842) internal successors, (229), 75 states have internal predecessors, (229), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:30:00,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:30:00,219 INFO L93 Difference]: Finished difference Result 260 states and 262 transitions. [2021-05-02 18:30:00,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-02 18:30:00,220 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 3.013157894736842) internal successors, (229), 75 states have internal predecessors, (229), 2 states have call successors, (4), 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 254 [2021-05-02 18:30:00,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:30:00,221 INFO L225 Difference]: With dead ends: 260 [2021-05-02 18:30:00,221 INFO L226 Difference]: Without dead ends: 260 [2021-05-02 18:30:00,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 255 SyntacticMatches, 2 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2561 ImplicationChecksByTransitivity, 10847.3ms TimeCoverageRelationStatistics Valid=581, Invalid=21175, Unknown=0, NotChecked=0, Total=21756 [2021-05-02 18:30:00,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-05-02 18:30:00,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 259. [2021-05-02 18:30:00,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 254 states have (on average 1.0118110236220472) internal successors, (257), 254 states have internal predecessors, (257), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:30:00,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 261 transitions. [2021-05-02 18:30:00,236 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 261 transitions. Word has length 254 [2021-05-02 18:30:00,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:30:00,236 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 261 transitions. [2021-05-02 18:30:00,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 3.013157894736842) internal successors, (229), 75 states have internal predecessors, (229), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:30:00,237 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 261 transitions. [2021-05-02 18:30:00,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-05-02 18:30:00,238 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:30:00,238 INFO L523 BasicCegarLoop]: trace histogram [82, 82, 72, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:30:00,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 18:30:00,453 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:30:00,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:30:00,453 INFO L82 PathProgramCache]: Analyzing trace with hash 963669926, now seen corresponding path program 29 times [2021-05-02 18:30:00,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:30:00,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607150269] [2021-05-02 18:30:00,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:30:00,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:30:05,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:30:05,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:30:05,092 INFO L134 CoverageAnalysis]: Checked inductivity of 10045 backedges. 2107 proven. 7812 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:30:05,092 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:30:05,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607150269] [2021-05-02 18:30:05,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607150269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:30:05,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820811287] [2021-05-02 18:30:05,092 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