/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 06:08:39,040 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 06:08:39,042 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 06:08:39,077 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 06:08:39,096 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 06:08:39,097 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 06:08:39,099 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 06:08:39,100 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 06:08:39,102 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 06:08:39,103 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 06:08:39,105 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 06:08:39,110 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 06:08:39,111 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 06:08:39,112 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 06:08:39,113 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 06:08:39,115 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 06:08:39,121 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 06:08:39,130 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 06:08:39,130 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 06:08:39,141 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 06:08:39,144 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 06:08:39,160 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 06:08:39,161 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 06:08:39,163 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 06:08:39,163 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 06:08:39,163 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 06:08:39,164 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 06:08:39,164 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 06:08:39,164 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 06:08:39,164 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 06:08:39,164 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 06:08:39,165 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 06:08:39,165 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 06:08:39,165 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 06:08:39,166 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 06:08:39,166 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 06:08:39,166 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 06:08:39,166 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 06:08:39,166 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 06:08:39,166 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 06:08:39,167 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 06:08:39,167 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 06:08:39,168 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 06:08:39,168 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 06:08:39,470 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 06:08:39,487 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 06:08:39,489 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 06:08:39,490 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 06:08:39,490 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 06:08:39,491 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c [2021-05-06 06:08:39,545 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec3376c7b/e9666cfe3e3549408969c6efe71d8888/FLAG6edc6c175 [2021-05-06 06:08:39,902 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 06:08:39,903 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c [2021-05-06 06:08:39,908 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec3376c7b/e9666cfe3e3549408969c6efe71d8888/FLAG6edc6c175 [2021-05-06 06:08:39,926 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec3376c7b/e9666cfe3e3549408969c6efe71d8888 [2021-05-06 06:08:39,929 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 06:08:39,930 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 06:08:39,935 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 06:08:39,935 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 06:08:39,938 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 06:08:39,939 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:08:39" (1/1) ... [2021-05-06 06:08:39,939 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3afff404 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:08:39, skipping insertion in model container [2021-05-06 06:08:39,940 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:08:39" (1/1) ... [2021-05-06 06:08:39,945 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 06:08:39,955 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 06:08:40,092 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c[313,326] [2021-05-06 06:08:40,103 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:08:40,111 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 06:08:40,121 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c[313,326] [2021-05-06 06:08:40,124 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:08:40,136 INFO L208 MainTranslator]: Completed translation [2021-05-06 06:08:40,136 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:08:40 WrapperNode [2021-05-06 06:08:40,136 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 06:08:40,137 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 06:08:40,138 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 06:08:40,138 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 06:08:40,146 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:08:40" (1/1) ... [2021-05-06 06:08:40,147 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:08:40" (1/1) ... [2021-05-06 06:08:40,152 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:08:40" (1/1) ... [2021-05-06 06:08:40,152 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:08:40" (1/1) ... [2021-05-06 06:08:40,157 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:08:40" (1/1) ... [2021-05-06 06:08:40,161 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:08:40" (1/1) ... [2021-05-06 06:08:40,183 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:08:40" (1/1) ... [2021-05-06 06:08:40,187 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 06:08:40,188 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 06:08:40,188 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 06:08:40,189 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 06:08:40,189 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:08:40" (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 [2021-05-06 06:08:40,281 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 06:08:40,281 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 06:08:40,281 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 06:08:40,282 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 06:08:40,282 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 06:08:40,282 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 06:08:40,282 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 06:08:40,282 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 06:08:40,283 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 06:08:40,283 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 06:08:40,283 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 06:08:40,283 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 06:08:40,283 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 06:08:40,284 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 06:08:40,284 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 06:08:40,284 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 06:08:40,284 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 06:08:40,493 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 06:08:40,493 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 06:08:40,494 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:08:40 BoogieIcfgContainer [2021-05-06 06:08:40,494 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 06:08:40,495 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 06:08:40,495 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 06:08:40,496 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 06:08:40,498 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:08:40" (1/1) ... [2021-05-06 06:08:40,509 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:08:40 BasicIcfg [2021-05-06 06:08:40,509 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 06:08:40,510 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 06:08:40,511 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 06:08:40,529 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 06:08:40,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 06:08:39" (1/4) ... [2021-05-06 06:08:40,530 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@818ede7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:08:40, skipping insertion in model container [2021-05-06 06:08:40,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:08:40" (2/4) ... [2021-05-06 06:08:40,531 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@818ede7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:08:40, skipping insertion in model container [2021-05-06 06:08:40,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:08:40" (3/4) ... [2021-05-06 06:08:40,531 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@818ede7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 06:08:40, skipping insertion in model container [2021-05-06 06:08:40,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:08:40" (4/4) ... [2021-05-06 06:08:40,532 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono1_1-2.cJordan [2021-05-06 06:08:40,536 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 06:08:40,539 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 06:08:40,552 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 06:08:40,567 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 06:08:40,567 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 06:08:40,567 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 06:08:40,568 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 06:08:40,568 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 06:08:40,568 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 06:08:40,568 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 06:08:40,568 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 06:08:40,579 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 06:08:40,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 06:08:40,584 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:40,584 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:40,584 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:40,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:40,588 INFO L82 PathProgramCache]: Analyzing trace with hash -756157467, now seen corresponding path program 1 times [2021-05-06 06:08:40,599 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:40,600 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976406776] [2021-05-06 06:08:40,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:40,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:40,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:40,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:40,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:40,744 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:40,744 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976406776] [2021-05-06 06:08:40,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [976406776] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:08:40,747 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:08:40,747 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 06:08:40,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337496069] [2021-05-06 06:08:40,750 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 06:08:40,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:40,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 06:08:40,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:08:40,761 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:40,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:40,791 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-05-06 06:08:40,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 06:08:40,793 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 [2021-05-06 06:08:40,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:40,799 INFO L225 Difference]: With dead ends: 19 [2021-05-06 06:08:40,800 INFO L226 Difference]: Without dead ends: 13 [2021-05-06 06:08:40,802 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:08:40,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-06 06:08:40,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-06 06:08:40,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:40,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-06 06:08:40,828 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-06 06:08:40,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:40,828 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-06 06:08:40,828 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) [2021-05-06 06:08:40,829 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-06 06:08:40,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 06:08:40,829 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:40,829 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:40,829 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 06:08:40,830 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:40,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:40,830 INFO L82 PathProgramCache]: Analyzing trace with hash -755233946, now seen corresponding path program 1 times [2021-05-06 06:08:40,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:40,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744722710] [2021-05-06 06:08:40,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:40,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:40,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:40,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:40,969 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:40,970 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:40,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744722710] [2021-05-06 06:08:40,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744722710] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:08:40,970 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:08:40,970 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 06:08:40,971 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528145193] [2021-05-06 06:08:40,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 06:08:40,972 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:40,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 06:08:40,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 06:08:40,973 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:41,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:41,097 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-05-06 06:08:41,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 06:08:41,097 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 [2021-05-06 06:08:41,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:41,098 INFO L225 Difference]: With dead ends: 15 [2021-05-06 06:08:41,099 INFO L226 Difference]: Without dead ends: 15 [2021-05-06 06:08:41,100 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 62.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 06:08:41,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-06 06:08:41,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-06 06:08:41,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:41,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-06 06:08:41,107 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-06 06:08:41,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:41,107 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-06 06:08:41,108 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) [2021-05-06 06:08:41,108 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-06 06:08:41,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-06 06:08:41,109 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:41,109 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:41,110 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 06:08:41,110 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:41,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:41,111 INFO L82 PathProgramCache]: Analyzing trace with hash 980092676, now seen corresponding path program 1 times [2021-05-06 06:08:41,112 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:41,113 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402598831] [2021-05-06 06:08:41,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:41,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:41,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:41,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:41,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:41,243 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:41,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402598831] [2021-05-06 06:08:41,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402598831] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:41,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434294307] [2021-05-06 06:08:41,247 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 [2021-05-06 06:08:41,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:41,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-06 06:08:41,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:41,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:41,355 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434294307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:41,355 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:41,355 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-06 06:08:41,356 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827063531] [2021-05-06 06:08:41,356 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 06:08:41,356 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:41,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 06:08:41,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 06:08:41,357 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:41,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:41,440 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-05-06 06:08:41,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 06:08:41,441 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-06 06:08:41,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:41,442 INFO L225 Difference]: With dead ends: 17 [2021-05-06 06:08:41,442 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 06:08:41,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 92.7ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 06:08:41,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 06:08:41,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-06 06:08:41,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:41,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-06 06:08:41,447 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2021-05-06 06:08:41,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:41,447 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-06 06:08:41,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:41,448 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-06 06:08:41,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 06:08:41,448 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:41,448 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:41,672 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 06:08:41,672 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:41,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:41,673 INFO L82 PathProgramCache]: Analyzing trace with hash -2113301726, now seen corresponding path program 2 times [2021-05-06 06:08:41,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:41,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078264095] [2021-05-06 06:08:41,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:41,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:41,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:41,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:41,788 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:41,788 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:41,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078264095] [2021-05-06 06:08:41,788 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078264095] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:41,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341175291] [2021-05-06 06:08:41,789 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 [2021-05-06 06:08:41,843 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:08:41,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:41,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 06:08:41,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:41,925 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:41,925 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341175291] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:41,925 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:41,925 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-06 06:08:41,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444715142] [2021-05-06 06:08:41,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 06:08:41,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:41,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 06:08:41,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 06:08:41,927 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:42,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:42,089 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-05-06 06:08:42,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 06:08:42,090 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-06 06:08:42,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:42,092 INFO L225 Difference]: With dead ends: 19 [2021-05-06 06:08:42,092 INFO L226 Difference]: Without dead ends: 19 [2021-05-06 06:08:42,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 154.8ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-06 06:08:42,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-06 06:08:42,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-06 06:08:42,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:42,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-06 06:08:42,097 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-05-06 06:08:42,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:42,099 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-06 06:08:42,099 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:42,099 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-06 06:08:42,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 06:08:42,100 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:42,100 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:42,323 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:08:42,324 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:42,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:42,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1547014080, now seen corresponding path program 3 times [2021-05-06 06:08:42,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:42,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547576076] [2021-05-06 06:08:42,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:42,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:42,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:42,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:42,471 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:42,471 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:42,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547576076] [2021-05-06 06:08:42,472 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [547576076] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:42,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430658300] [2021-05-06 06:08:42,472 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 [2021-05-06 06:08:42,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-06 06:08:42,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:42,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 06:08:42,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:42,604 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-06 06:08:42,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430658300] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:08:42,604 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-06 06:08:42,605 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2021-05-06 06:08:42,605 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414967248] [2021-05-06 06:08:42,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 06:08:42,605 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:42,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 06:08:42,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-06 06:08:42,606 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:42,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:42,637 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-05-06 06:08:42,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 06:08:42,649 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 06:08:42,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:42,649 INFO L225 Difference]: With dead ends: 21 [2021-05-06 06:08:42,649 INFO L226 Difference]: Without dead ends: 21 [2021-05-06 06:08:42,650 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 89.7ms TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-06 06:08:42,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-06 06:08:42,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-06 06:08:42,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:42,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-05-06 06:08:42,652 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2021-05-06 06:08:42,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:42,652 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-05-06 06:08:42,652 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:42,652 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-05-06 06:08:42,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 06:08:42,653 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:42,653 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:42,853 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:08:42,854 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:42,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:42,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1560917373, now seen corresponding path program 1 times [2021-05-06 06:08:42,855 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:42,855 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941336316] [2021-05-06 06:08:42,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:42,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:42,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:42,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:42,957 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:42,959 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:42,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941336316] [2021-05-06 06:08:42,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941336316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:42,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [595531329] [2021-05-06 06:08:42,960 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 [2021-05-06 06:08:43,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:43,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 06:08:43,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:43,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:43,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:43,093 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:43,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [595531329] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:43,094 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:43,094 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-06 06:08:43,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421169973] [2021-05-06 06:08:43,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 06:08:43,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:43,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 06:08:43,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 06:08:43,095 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:43,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:43,267 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-05-06 06:08:43,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 06:08:43,283 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-06 06:08:43,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:43,283 INFO L225 Difference]: With dead ends: 22 [2021-05-06 06:08:43,283 INFO L226 Difference]: Without dead ends: 22 [2021-05-06 06:08:43,284 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 168.3ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-06 06:08:43,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-06 06:08:43,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-06 06:08:43,290 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) [2021-05-06 06:08:43,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-06 06:08:43,292 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2021-05-06 06:08:43,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:43,292 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-06 06:08:43,293 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:43,293 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-06 06:08:43,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 06:08:43,293 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:43,294 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:43,505 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:08:43,506 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:43,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:43,506 INFO L82 PathProgramCache]: Analyzing trace with hash 294269723, now seen corresponding path program 2 times [2021-05-06 06:08:43,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:43,507 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539405806] [2021-05-06 06:08:43,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:43,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:43,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:43,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:43,606 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:43,606 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:43,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539405806] [2021-05-06 06:08:43,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1539405806] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:43,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145395800] [2021-05-06 06:08:43,606 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 [2021-05-06 06:08:43,649 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:08:43,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:43,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 06:08:43,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:43,712 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:43,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145395800] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:43,712 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:43,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-05-06 06:08:43,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952823295] [2021-05-06 06:08:43,713 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 06:08:43,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:43,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 06:08:43,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-06 06:08:43,714 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:43,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:43,910 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-06 06:08:43,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 06:08:43,910 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-06 06:08:43,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:43,912 INFO L225 Difference]: With dead ends: 24 [2021-05-06 06:08:43,912 INFO L226 Difference]: Without dead ends: 24 [2021-05-06 06:08:43,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 188.2ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-06 06:08:43,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-06 06:08:43,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-06 06:08:43,917 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) [2021-05-06 06:08:43,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-06 06:08:43,918 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2021-05-06 06:08:43,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:43,918 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-06 06:08:43,918 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:43,918 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-06 06:08:43,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 06:08:43,919 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:43,919 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:44,128 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-06 06:08:44,129 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:44,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:44,129 INFO L82 PathProgramCache]: Analyzing trace with hash -1478377159, now seen corresponding path program 3 times [2021-05-06 06:08:44,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:44,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321482702] [2021-05-06 06:08:44,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:44,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:44,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:44,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:44,259 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:44,259 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:44,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321482702] [2021-05-06 06:08:44,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [321482702] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:44,260 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880142947] [2021-05-06 06:08:44,260 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 [2021-05-06 06:08:44,352 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 06:08:44,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:44,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 06:08:44,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:44,414 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-06 06:08:44,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880142947] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:44,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:44,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4] total 11 [2021-05-06 06:08:44,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958780359] [2021-05-06 06:08:44,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 06:08:44,415 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:44,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 06:08:44,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-06 06:08:44,416 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:44,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:44,853 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-06 06:08:44,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 06:08:44,853 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-06 06:08:44,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:44,854 INFO L225 Difference]: With dead ends: 31 [2021-05-06 06:08:44,854 INFO L226 Difference]: Without dead ends: 31 [2021-05-06 06:08:44,854 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 420.6ms TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-05-06 06:08:44,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-06 06:08:44,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-06 06:08:44,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:44,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-06 06:08:44,857 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-05-06 06:08:44,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:44,857 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-06 06:08:44,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:44,857 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-06 06:08:44,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 06:08:44,858 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:44,858 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:45,058 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:08:45,059 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:45,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:45,059 INFO L82 PathProgramCache]: Analyzing trace with hash -738804780, now seen corresponding path program 4 times [2021-05-06 06:08:45,059 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:45,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82331664] [2021-05-06 06:08:45,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:45,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:45,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:45,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:45,180 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:08:45,180 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:45,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82331664] [2021-05-06 06:08:45,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82331664] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:45,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1721167976] [2021-05-06 06:08:45,180 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 [2021-05-06 06:08:45,233 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:08:45,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:45,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 06:08:45,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:45,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:45,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:45,314 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:08:45,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1721167976] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:45,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:45,314 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-06 06:08:45,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190122346] [2021-05-06 06:08:45,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 06:08:45,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:45,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 06:08:45,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 06:08:45,316 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:45,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:45,589 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-05-06 06:08:45,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 06:08:45,590 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-06 06:08:45,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:45,590 INFO L225 Difference]: With dead ends: 30 [2021-05-06 06:08:45,591 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 06:08:45,591 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 256.8ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-06 06:08:45,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 06:08:45,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-06 06:08:45,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:45,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-06 06:08:45,593 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2021-05-06 06:08:45,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:45,594 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-06 06:08:45,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:45,594 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-06 06:08:45,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 06:08:45,595 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:45,595 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:45,818 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:08:45,818 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:45,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:45,818 INFO L82 PathProgramCache]: Analyzing trace with hash -186205326, now seen corresponding path program 5 times [2021-05-06 06:08:45,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:45,819 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142376480] [2021-05-06 06:08:45,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:45,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:45,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:45,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:45,983 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:08:45,983 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:45,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142376480] [2021-05-06 06:08:45,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142376480] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:45,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275499049] [2021-05-06 06:08:45,983 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 [2021-05-06 06:08:46,052 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-06 06:08:46,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:46,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-06 06:08:46,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:46,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:46,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:46,182 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:08:46,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1275499049] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:46,182 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:46,182 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-06 06:08:46,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117560391] [2021-05-06 06:08:46,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 06:08:46,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:46,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 06:08:46,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 06:08:46,183 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:46,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:46,495 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-05-06 06:08:46,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 06:08:46,496 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-06 06:08:46,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:46,496 INFO L225 Difference]: With dead ends: 32 [2021-05-06 06:08:46,496 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 06:08:46,497 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 324.0ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-06 06:08:46,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 06:08:46,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 06:08:46,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:46,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-05-06 06:08:46,500 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2021-05-06 06:08:46,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:46,500 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-05-06 06:08:46,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:46,500 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-05-06 06:08:46,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 06:08:46,501 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:46,501 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:46,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 06:08:46,717 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:46,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:46,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1714074736, now seen corresponding path program 6 times [2021-05-06 06:08:46,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:46,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766864576] [2021-05-06 06:08:46,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:46,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:46,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:46,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:46,861 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:08:46,861 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:46,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766864576] [2021-05-06 06:08:46,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766864576] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:46,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371507653] [2021-05-06 06:08:46,862 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 [2021-05-06 06:08:46,999 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-05-06 06:08:46,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:47,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-06 06:08:47,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:47,113 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:47,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371507653] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:47,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:47,114 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 15 [2021-05-06 06:08:47,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310112259] [2021-05-06 06:08:47,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 06:08:47,114 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:47,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 06:08:47,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-06 06:08:47,115 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:47,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:47,550 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-05-06 06:08:47,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 06:08:47,550 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-06 06:08:47,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:47,551 INFO L225 Difference]: With dead ends: 34 [2021-05-06 06:08:47,551 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 06:08:47,551 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 400.6ms TimeCoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2021-05-06 06:08:47,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 06:08:47,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-06 06:08:47,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:47,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-05-06 06:08:47,558 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2021-05-06 06:08:47,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:47,558 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-05-06 06:08:47,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:47,558 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-05-06 06:08:47,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 06:08:47,559 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:47,559 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:47,760 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:08:47,761 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:47,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:47,762 INFO L82 PathProgramCache]: Analyzing trace with hash -1117762514, now seen corresponding path program 7 times [2021-05-06 06:08:47,762 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:47,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409636892] [2021-05-06 06:08:47,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:47,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:47,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:47,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:47,914 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:08:47,914 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:47,914 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409636892] [2021-05-06 06:08:47,914 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409636892] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:47,914 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807968755] [2021-05-06 06:08:47,914 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 [2021-05-06 06:08:47,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:47,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-06 06:08:47,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:48,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:48,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:48,073 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:08:48,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807968755] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:48,073 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:48,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-06 06:08:48,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409716998] [2021-05-06 06:08:48,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 06:08:48,075 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:48,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 06:08:48,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-06 06:08:48,075 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:48,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:48,507 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-05-06 06:08:48,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 06:08:48,508 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-06 06:08:48,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:48,511 INFO L225 Difference]: With dead ends: 36 [2021-05-06 06:08:48,511 INFO L226 Difference]: Without dead ends: 36 [2021-05-06 06:08:48,512 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 399.5ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-06 06:08:48,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-06 06:08:48,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-06 06:08:48,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:48,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-05-06 06:08:48,523 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2021-05-06 06:08:48,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:48,523 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-05-06 06:08:48,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:48,524 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-05-06 06:08:48,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 06:08:48,524 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:48,524 INFO L523 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:48,742 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:08:48,742 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:48,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:48,742 INFO L82 PathProgramCache]: Analyzing trace with hash 707632460, now seen corresponding path program 8 times [2021-05-06 06:08:48,743 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:48,743 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569876906] [2021-05-06 06:08:48,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:48,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:48,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:48,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:48,955 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 33 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:08:48,955 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:48,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569876906] [2021-05-06 06:08:48,955 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [569876906] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:48,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165611028] [2021-05-06 06:08:48,955 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 [2021-05-06 06:08:49,003 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:08:49,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:49,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-06 06:08:49,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:49,121 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:49,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165611028] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:49,121 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:49,121 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 17 [2021-05-06 06:08:49,121 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411869499] [2021-05-06 06:08:49,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 06:08:49,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:49,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 06:08:49,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-06 06:08:49,122 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:49,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:49,624 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2021-05-06 06:08:49,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 06:08:49,624 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-06 06:08:49,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:49,625 INFO L225 Difference]: With dead ends: 38 [2021-05-06 06:08:49,625 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 06:08:49,626 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 474.8ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-06 06:08:49,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 06:08:49,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-06 06:08:49,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:49,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-05-06 06:08:49,631 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2021-05-06 06:08:49,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:49,631 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-05-06 06:08:49,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:49,631 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-05-06 06:08:49,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 06:08:49,632 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:49,632 INFO L523 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:49,856 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-06 06:08:49,856 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:49,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:49,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1729421590, now seen corresponding path program 9 times [2021-05-06 06:08:49,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:49,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381491816] [2021-05-06 06:08:49,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:49,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:50,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:50,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:50,082 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:08:50,082 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:50,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381491816] [2021-05-06 06:08:50,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381491816] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:50,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351930001] [2021-05-06 06:08:50,082 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 [2021-05-06 06:08:50,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-06 06:08:50,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:50,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 06:08:50,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:50,267 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 4 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-05-06 06:08:50,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351930001] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:50,267 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:50,267 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5] total 18 [2021-05-06 06:08:50,267 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723483120] [2021-05-06 06:08:50,268 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 06:08:50,268 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:50,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 06:08:50,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-05-06 06:08:50,269 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:51,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:51,058 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2021-05-06 06:08:51,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 06:08:51,058 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-06 06:08:51,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:51,060 INFO L225 Difference]: With dead ends: 45 [2021-05-06 06:08:51,060 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 06:08:51,061 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 760.3ms TimeCoverageRelationStatistics Valid=215, Invalid=907, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 06:08:51,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 06:08:51,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2021-05-06 06:08:51,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 37 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:51,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2021-05-06 06:08:51,065 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 37 [2021-05-06 06:08:51,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:51,065 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2021-05-06 06:08:51,065 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:51,065 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2021-05-06 06:08:51,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 06:08:51,066 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:51,066 INFO L523 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:51,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-06 06:08:51,281 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:51,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:51,281 INFO L82 PathProgramCache]: Analyzing trace with hash 761242821, now seen corresponding path program 10 times [2021-05-06 06:08:51,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:51,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673138663] [2021-05-06 06:08:51,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:51,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:51,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:51,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:51,501 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 06:08:51,501 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:51,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673138663] [2021-05-06 06:08:51,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1673138663] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:51,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845369334] [2021-05-06 06:08:51,501 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 [2021-05-06 06:08:51,558 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:08:51,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:51,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-06 06:08:51,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:51,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:51,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:51,672 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 06:08:51,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845369334] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:51,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:51,672 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-06 06:08:51,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957072478] [2021-05-06 06:08:51,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 06:08:51,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:51,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 06:08:51,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-06 06:08:51,674 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:52,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:52,195 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2021-05-06 06:08:52,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 06:08:52,196 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-06 06:08:52,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:52,196 INFO L225 Difference]: With dead ends: 44 [2021-05-06 06:08:52,196 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 06:08:52,197 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 526.4ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-06 06:08:52,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 06:08:52,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-06 06:08:52,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:52,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2021-05-06 06:08:52,199 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 41 [2021-05-06 06:08:52,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:52,199 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2021-05-06 06:08:52,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:52,199 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2021-05-06 06:08:52,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 06:08:52,200 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:52,200 INFO L523 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:52,420 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-06 06:08:52,421 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:52,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:52,421 INFO L82 PathProgramCache]: Analyzing trace with hash -2075068445, now seen corresponding path program 11 times [2021-05-06 06:08:52,421 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:52,421 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881244099] [2021-05-06 06:08:52,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:52,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:52,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:52,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:52,662 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 06:08:52,662 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:52,662 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881244099] [2021-05-06 06:08:52,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881244099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:52,662 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2062240276] [2021-05-06 06:08:52,663 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 [2021-05-06 06:08:53,268 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-06 06:08:53,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:53,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-06 06:08:53,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:53,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:53,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:53,559 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 06:08:53,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2062240276] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:53,560 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:53,560 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-06 06:08:53,560 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368186737] [2021-05-06 06:08:53,560 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 06:08:53,560 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:53,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 06:08:53,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-06 06:08:53,561 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:54,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:54,191 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2021-05-06 06:08:54,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 06:08:54,191 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-06 06:08:54,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:54,192 INFO L225 Difference]: With dead ends: 46 [2021-05-06 06:08:54,192 INFO L226 Difference]: Without dead ends: 46 [2021-05-06 06:08:54,192 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 32 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 701.0ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-06 06:08:54,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-06 06:08:54,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-06 06:08:54,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0975609756097562) internal successors, (45), 41 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:54,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2021-05-06 06:08:54,195 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 43 [2021-05-06 06:08:54,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:54,195 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2021-05-06 06:08:54,195 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:54,195 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2021-05-06 06:08:54,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 06:08:54,196 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:54,196 INFO L523 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:54,401 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:08:54,401 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:54,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:54,401 INFO L82 PathProgramCache]: Analyzing trace with hash -465962111, now seen corresponding path program 12 times [2021-05-06 06:08:54,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:54,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440939736] [2021-05-06 06:08:54,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:54,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:54,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:54,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:54,645 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 75 proven. 210 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 06:08:54,645 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:54,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440939736] [2021-05-06 06:08:54,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1440939736] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:54,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213154462] [2021-05-06 06:08:54,645 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 [2021-05-06 06:08:54,840 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-06 06:08:54,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:54,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-06 06:08:54,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:54,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:54,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:54,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:54,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:54,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:54,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:54,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:54,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:54,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:54,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:54,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:54,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:55,279 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 98 proven. 9 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-05-06 06:08:55,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213154462] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:55,280 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:55,280 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6] total 22 [2021-05-06 06:08:55,280 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517377587] [2021-05-06 06:08:55,280 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 06:08:55,280 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:55,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 06:08:55,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-05-06 06:08:55,281 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:56,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:56,293 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2021-05-06 06:08:56,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 06:08:56,294 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-06 06:08:56,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:56,294 INFO L225 Difference]: With dead ends: 51 [2021-05-06 06:08:56,294 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 06:08:56,295 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 43 SyntacticMatches, 4 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 1101.9ms TimeCoverageRelationStatistics Valid=199, Invalid=1441, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 06:08:56,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 06:08:56,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-06 06:08:56,296 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) [2021-05-06 06:08:56,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-06 06:08:56,297 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 45 [2021-05-06 06:08:56,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:56,297 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-06 06:08:56,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:56,297 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-06 06:08:56,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 06:08:56,298 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:56,298 INFO L523 BasicCegarLoop]: trace histogram [19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:56,501 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 06:08:56,501 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:56,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:56,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1812216220, now seen corresponding path program 13 times [2021-05-06 06:08:56,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:56,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426768429] [2021-05-06 06:08:56,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:56,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:56,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:56,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:56,749 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-06 06:08:56,749 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:56,749 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426768429] [2021-05-06 06:08:56,750 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426768429] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:56,750 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985504080] [2021-05-06 06:08:56,750 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 [2021-05-06 06:08:56,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:56,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-06 06:08:56,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:56,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:56,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:08:56,953 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-06 06:08:56,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1985504080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:56,953 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:56,953 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-06 06:08:56,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531885638] [2021-05-06 06:08:56,954 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 06:08:56,954 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:56,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 06:08:56,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-06 06:08:56,954 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:57,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:57,720 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2021-05-06 06:08:57,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 06:08:57,721 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-06 06:08:57,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:57,721 INFO L225 Difference]: With dead ends: 53 [2021-05-06 06:08:57,721 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 06:08:57,722 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 668.2ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 06:08:57,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 06:08:57,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-06 06:08:57,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:57,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-05-06 06:08:57,726 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2021-05-06 06:08:57,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:57,726 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-05-06 06:08:57,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:57,727 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-05-06 06:08:57,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 06:08:57,728 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:57,728 INFO L523 BasicCegarLoop]: trace histogram [20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:57,941 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-06 06:08:57,941 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:57,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:57,941 INFO L82 PathProgramCache]: Analyzing trace with hash -772305222, now seen corresponding path program 14 times [2021-05-06 06:08:57,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:57,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577116912] [2021-05-06 06:08:57,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:57,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:58,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:58,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:58,240 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 119 proven. 272 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-06 06:08:58,240 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:58,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577116912] [2021-05-06 06:08:58,240 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577116912] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:58,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272736882] [2021-05-06 06:08:58,240 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 [2021-05-06 06:08:58,305 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:08:58,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:58,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-06 06:08:58,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:08:58,494 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:08:58,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1272736882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:58,495 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:08:58,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 25 [2021-05-06 06:08:58,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204476195] [2021-05-06 06:08:58,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 06:08:58,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:08:58,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 06:08:58,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=536, Unknown=0, NotChecked=0, Total=600 [2021-05-06 06:08:58,496 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:59,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:08:59,380 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-05-06 06:08:59,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 06:08:59,380 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-06 06:08:59,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:08:59,381 INFO L225 Difference]: With dead ends: 55 [2021-05-06 06:08:59,381 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 06:08:59,381 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 845.3ms TimeCoverageRelationStatistics Valid=149, Invalid=1573, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 06:08:59,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 06:08:59,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-06 06:08:59,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:59,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-06 06:08:59,383 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2021-05-06 06:08:59,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:08:59,384 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-06 06:08:59,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:08:59,384 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-06 06:08:59,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 06:08:59,384 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:08:59,384 INFO L523 BasicCegarLoop]: trace histogram [21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:08:59,600 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:08:59,601 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:08:59,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:08:59,601 INFO L82 PathProgramCache]: Analyzing trace with hash -2006313896, now seen corresponding path program 15 times [2021-05-06 06:08:59,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:08:59,601 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105439536] [2021-05-06 06:08:59,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:08:59,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:59,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:08:59,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:08:59,892 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 126 proven. 306 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-06 06:08:59,892 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:08:59,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105439536] [2021-05-06 06:08:59,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105439536] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:08:59,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541788650] [2021-05-06 06:08:59,892 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 [2021-05-06 06:08:59,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-06 06:08:59,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:08:59,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 06:08:59,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:00,315 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 153 proven. 16 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-05-06 06:09:00,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541788650] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:00,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:00,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7] total 26 [2021-05-06 06:09:00,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374673413] [2021-05-06 06:09:00,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 06:09:00,316 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:00,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 06:09:00,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=554, Unknown=0, NotChecked=0, Total=650 [2021-05-06 06:09:00,316 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:01,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:01,853 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2021-05-06 06:09:01,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 06:09:01,854 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-06 06:09:01,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:01,854 INFO L225 Difference]: With dead ends: 61 [2021-05-06 06:09:01,854 INFO L226 Difference]: Without dead ends: 61 [2021-05-06 06:09:01,855 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 1481.0ms TimeCoverageRelationStatistics Valid=293, Invalid=2157, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 06:09:01,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-06 06:09:01,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2021-05-06 06:09:01,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:01,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2021-05-06 06:09:01,857 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 53 [2021-05-06 06:09:01,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:01,857 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2021-05-06 06:09:01,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:01,857 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2021-05-06 06:09:01,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 06:09:01,858 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:01,858 INFO L523 BasicCegarLoop]: trace histogram [23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:02,060 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:09:02,061 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:02,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:02,061 INFO L82 PathProgramCache]: Analyzing trace with hash -695600461, now seen corresponding path program 16 times [2021-05-06 06:09:02,061 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:02,061 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039589010] [2021-05-06 06:09:02,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:02,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:02,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:02,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:02,393 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 06:09:02,394 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:02,394 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039589010] [2021-05-06 06:09:02,394 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039589010] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:02,394 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359193124] [2021-05-06 06:09:02,394 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 [2021-05-06 06:09:02,448 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:09:02,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:02,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-06 06:09:02,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:02,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:02,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:02,577 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 06:09:02,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359193124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:02,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:02,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-06 06:09:02,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725490608] [2021-05-06 06:09:02,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 06:09:02,578 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:02,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 06:09:02,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-06 06:09:02,579 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:03,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:03,508 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2021-05-06 06:09:03,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 06:09:03,509 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-06 06:09:03,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:03,510 INFO L225 Difference]: With dead ends: 61 [2021-05-06 06:09:03,510 INFO L226 Difference]: Without dead ends: 61 [2021-05-06 06:09:03,511 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 827.3ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 06:09:03,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-06 06:09:03,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-06 06:09:03,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:03,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-06 06:09:03,513 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2021-05-06 06:09:03,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:03,513 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-06 06:09:03,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:03,513 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-06 06:09:03,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 06:09:03,513 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:03,514 INFO L523 BasicCegarLoop]: trace histogram [24, 19, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:03,720 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:09:03,721 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:03,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:03,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1302507055, now seen corresponding path program 17 times [2021-05-06 06:09:03,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:03,721 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487756500] [2021-05-06 06:09:03,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:03,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:04,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:04,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:04,098 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 06:09:04,098 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:04,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487756500] [2021-05-06 06:09:04,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1487756500] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:04,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82365219] [2021-05-06 06:09:04,098 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 [2021-05-06 06:09:05,386 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-06 06:09:05,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:05,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-06 06:09:05,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:05,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:05,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:05,612 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 69 proven. 506 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:09:05,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [82365219] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:05,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:05,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 25] total 27 [2021-05-06 06:09:05,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055715919] [2021-05-06 06:09:05,613 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 06:09:05,613 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:05,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 06:09:05,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=631, Unknown=0, NotChecked=0, Total=702 [2021-05-06 06:09:05,614 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:06,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:06,650 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2021-05-06 06:09:06,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 06:09:06,650 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-06 06:09:06,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:06,651 INFO L225 Difference]: With dead ends: 63 [2021-05-06 06:09:06,651 INFO L226 Difference]: Without dead ends: 63 [2021-05-06 06:09:06,651 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 947.4ms TimeCoverageRelationStatistics Valid=171, Invalid=1991, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 06:09:06,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-06 06:09:06,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-06 06:09:06,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:06,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-06 06:09:06,653 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2021-05-06 06:09:06,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:06,654 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-06 06:09:06,654 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:06,654 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-06 06:09:06,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 06:09:06,654 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:06,654 INFO L523 BasicCegarLoop]: trace histogram [25, 20, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:06,859 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-06 06:09:06,860 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:06,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:06,860 INFO L82 PathProgramCache]: Analyzing trace with hash -424191633, now seen corresponding path program 18 times [2021-05-06 06:09:06,860 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:06,860 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156741652] [2021-05-06 06:09:06,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:06,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:07,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:07,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:07,249 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 189 proven. 420 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 06:09:07,249 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:07,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156741652] [2021-05-06 06:09:07,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156741652] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:07,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758644441] [2021-05-06 06:09:07,250 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 [2021-05-06 06:09:07,650 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2021-05-06 06:09:07,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:07,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-06 06:09:07,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:08,046 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 220 proven. 25 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2021-05-06 06:09:08,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758644441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:08,047 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:08,047 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8] total 30 [2021-05-06 06:09:08,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611865002] [2021-05-06 06:09:08,047 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 06:09:08,047 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:08,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 06:09:08,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=729, Unknown=0, NotChecked=0, Total=870 [2021-05-06 06:09:08,048 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:10,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:10,122 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2021-05-06 06:09:10,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 06:09:10,123 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-06 06:09:10,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:10,123 INFO L225 Difference]: With dead ends: 69 [2021-05-06 06:09:10,123 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 06:09:10,124 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 2177.1ms TimeCoverageRelationStatistics Valid=407, Invalid=2899, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 06:09:10,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 06:09:10,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2021-05-06 06:09:10,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:10,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-06 06:09:10,125 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 61 [2021-05-06 06:09:10,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:10,125 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-06 06:09:10,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:10,126 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-06 06:09:10,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 06:09:10,126 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:10,126 INFO L523 BasicCegarLoop]: trace histogram [27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:10,326 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 06:09:10,327 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:10,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:10,327 INFO L82 PathProgramCache]: Analyzing trace with hash 821090314, now seen corresponding path program 19 times [2021-05-06 06:09:10,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:10,327 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397834200] [2021-05-06 06:09:10,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:10,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:10,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:10,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:10,710 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-06 06:09:10,710 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:10,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397834200] [2021-05-06 06:09:10,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397834200] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:10,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894758364] [2021-05-06 06:09:10,711 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 [2021-05-06 06:09:10,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:10,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-06 06:09:10,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:10,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:10,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:10,914 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-06 06:09:10,914 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894758364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:10,915 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:10,915 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-06 06:09:10,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088451694] [2021-05-06 06:09:10,915 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 06:09:10,915 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:10,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 06:09:10,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-06 06:09:10,916 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:11,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:11,927 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-05-06 06:09:11,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 06:09:11,927 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-06 06:09:11,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:11,928 INFO L225 Difference]: With dead ends: 69 [2021-05-06 06:09:11,928 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 06:09:11,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 984.8ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 06:09:11,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 06:09:11,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-06 06:09:11,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:11,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-05-06 06:09:11,931 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2021-05-06 06:09:11,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:11,931 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-05-06 06:09:11,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:11,932 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-05-06 06:09:11,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 06:09:11,932 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:11,932 INFO L523 BasicCegarLoop]: trace histogram [28, 22, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:12,148 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:09:12,149 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:12,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:12,149 INFO L82 PathProgramCache]: Analyzing trace with hash 729952552, now seen corresponding path program 20 times [2021-05-06 06:09:12,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:12,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575308908] [2021-05-06 06:09:12,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:12,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:12,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:12,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:12,557 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 253 proven. 506 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-06 06:09:12,557 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:12,557 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575308908] [2021-05-06 06:09:12,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575308908] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:12,557 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631034426] [2021-05-06 06:09:12,557 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 [2021-05-06 06:09:12,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:09:12,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:12,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-06 06:09:12,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:12,933 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:09:12,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1631034426] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:12,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:12,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 31] total 33 [2021-05-06 06:09:12,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397158537] [2021-05-06 06:09:12,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 06:09:12,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:12,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 06:09:12,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=970, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 06:09:12,935 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:14,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:14,258 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2021-05-06 06:09:14,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 06:09:14,259 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-06 06:09:14,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:14,259 INFO L225 Difference]: With dead ends: 71 [2021-05-06 06:09:14,259 INFO L226 Difference]: Without dead ends: 71 [2021-05-06 06:09:14,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1282.3ms TimeCoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 06:09:14,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-06 06:09:14,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-06 06:09:14,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:14,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-05-06 06:09:14,261 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2021-05-06 06:09:14,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:14,261 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-05-06 06:09:14,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:14,261 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-05-06 06:09:14,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 06:09:14,262 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:14,262 INFO L523 BasicCegarLoop]: trace histogram [29, 23, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:14,462 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-06 06:09:14,463 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:14,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:14,463 INFO L82 PathProgramCache]: Analyzing trace with hash -954090810, now seen corresponding path program 21 times [2021-05-06 06:09:14,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:14,463 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466822183] [2021-05-06 06:09:14,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:14,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:14,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:14,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:14,944 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 264 proven. 552 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-06 06:09:14,944 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:14,944 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466822183] [2021-05-06 06:09:14,944 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466822183] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:14,944 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734373909] [2021-05-06 06:09:14,944 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 [2021-05-06 06:09:15,051 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-06 06:09:15,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:15,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-06 06:09:15,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:15,930 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 299 proven. 36 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-05-06 06:09:15,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734373909] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:15,930 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:15,930 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 9] total 34 [2021-05-06 06:09:15,931 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048771423] [2021-05-06 06:09:15,931 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 06:09:15,931 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:15,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 06:09:15,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1012, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 06:09:15,932 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:18,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:18,181 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2021-05-06 06:09:18,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 06:09:18,181 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-06 06:09:18,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:18,182 INFO L225 Difference]: With dead ends: 75 [2021-05-06 06:09:18,182 INFO L226 Difference]: Without dead ends: 75 [2021-05-06 06:09:18,183 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 2379.4ms TimeCoverageRelationStatistics Valid=325, Invalid=3835, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 06:09:18,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-06 06:09:18,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-05-06 06:09:18,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:18,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2021-05-06 06:09:18,184 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 69 [2021-05-06 06:09:18,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:18,185 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2021-05-06 06:09:18,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:18,185 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2021-05-06 06:09:18,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 06:09:18,185 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:18,185 INFO L523 BasicCegarLoop]: trace histogram [31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:18,390 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:09:18,390 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:18,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:18,390 INFO L82 PathProgramCache]: Analyzing trace with hash 83673505, now seen corresponding path program 22 times [2021-05-06 06:09:18,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:18,391 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80204414] [2021-05-06 06:09:18,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:18,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:18,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:18,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:18,857 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-06 06:09:18,857 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:18,858 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80204414] [2021-05-06 06:09:18,858 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80204414] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:18,858 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284078969] [2021-05-06 06:09:18,858 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 [2021-05-06 06:09:18,907 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:09:18,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:18,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-06 06:09:18,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:19,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:19,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:19,080 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-06 06:09:19,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284078969] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:19,080 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:19,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-06 06:09:19,081 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543123431] [2021-05-06 06:09:19,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 06:09:19,081 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:19,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 06:09:19,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-06 06:09:19,082 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:20,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:20,403 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2021-05-06 06:09:20,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 06:09:20,403 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-06 06:09:20,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:20,404 INFO L225 Difference]: With dead ends: 77 [2021-05-06 06:09:20,404 INFO L226 Difference]: Without dead ends: 77 [2021-05-06 06:09:20,405 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1194.2ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 06:09:20,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-06 06:09:20,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-06 06:09:20,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:20,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-05-06 06:09:20,406 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2021-05-06 06:09:20,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:20,406 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-05-06 06:09:20,406 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:20,406 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-05-06 06:09:20,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 06:09:20,407 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:20,407 INFO L523 BasicCegarLoop]: trace histogram [32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:20,607 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-06 06:09:20,607 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:20,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:20,608 INFO L82 PathProgramCache]: Analyzing trace with hash 153754815, now seen corresponding path program 23 times [2021-05-06 06:09:20,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:20,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494825517] [2021-05-06 06:09:20,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:20,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:21,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:21,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:21,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-06 06:09:21,093 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:21,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494825517] [2021-05-06 06:09:21,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [494825517] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:21,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214522367] [2021-05-06 06:09:21,094 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 [2021-05-06 06:09:25,018 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2021-05-06 06:09:25,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:25,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-06 06:09:25,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:25,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-06 06:09:25,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1214522367] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:25,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:25,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-06 06:09:25,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144846385] [2021-05-06 06:09:25,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 06:09:25,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:25,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 06:09:25,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-06 06:09:25,546 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:26,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:26,959 INFO L93 Difference]: Finished difference Result 79 states and 81 transitions. [2021-05-06 06:09:26,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 06:09:26,959 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-06 06:09:26,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:26,960 INFO L225 Difference]: With dead ends: 79 [2021-05-06 06:09:26,960 INFO L226 Difference]: Without dead ends: 79 [2021-05-06 06:09:26,960 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 52 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 1603.4ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 06:09:26,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-06 06:09:26,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-06 06:09:26,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:26,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-06 06:09:26,962 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2021-05-06 06:09:26,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:26,963 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-06 06:09:26,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:26,963 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-06 06:09:26,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 06:09:26,963 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:26,963 INFO L523 BasicCegarLoop]: trace histogram [33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:27,169 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-06 06:09:27,170 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:27,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:27,170 INFO L82 PathProgramCache]: Analyzing trace with hash -1217583011, now seen corresponding path program 24 times [2021-05-06 06:09:27,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:27,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837161627] [2021-05-06 06:09:27,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:27,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:27,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:27,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:27,747 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 351 proven. 702 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-06 06:09:27,747 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:27,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837161627] [2021-05-06 06:09:27,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837161627] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:27,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1445062351] [2021-05-06 06:09:27,748 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 [2021-05-06 06:09:29,005 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-06 06:09:29,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:29,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-06 06:09:29,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:30,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 390 proven. 49 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-05-06 06:09:30,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1445062351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:30,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:30,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 10] total 38 [2021-05-06 06:09:30,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590454063] [2021-05-06 06:09:30,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 06:09:30,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:30,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 06:09:30,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1282, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 06:09:30,129 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 38 states, 38 states have (on average 2.1842105263157894) internal successors, (83), 37 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) [2021-05-06 06:09:32,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:32,634 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2021-05-06 06:09:32,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 06:09:32,635 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1842105263157894) internal successors, (83), 37 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 77 [2021-05-06 06:09:32,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:32,635 INFO L225 Difference]: With dead ends: 83 [2021-05-06 06:09:32,635 INFO L226 Difference]: Without dead ends: 83 [2021-05-06 06:09:32,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 72 SyntacticMatches, 7 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 2883.8ms TimeCoverageRelationStatistics Valid=367, Invalid=4889, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 06:09:32,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-06 06:09:32,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-05-06 06:09:32,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:32,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-05-06 06:09:32,639 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 77 [2021-05-06 06:09:32,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:32,639 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-05-06 06:09:32,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1842105263157894) internal successors, (83), 37 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) [2021-05-06 06:09:32,639 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-05-06 06:09:32,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 06:09:32,639 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:32,639 INFO L523 BasicCegarLoop]: trace histogram [35, 27, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:32,844 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-06 06:09:32,845 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:32,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:32,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1094035320, now seen corresponding path program 25 times [2021-05-06 06:09:32,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:32,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831138907] [2021-05-06 06:09:32,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:32,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:33,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:33,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:33,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-06 06:09:33,358 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:33,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831138907] [2021-05-06 06:09:33,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831138907] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:33,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394051778] [2021-05-06 06:09:33,358 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 [2021-05-06 06:09:33,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:33,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-06 06:09:33,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:33,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:33,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:33,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-06 06:09:33,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394051778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:33,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:33,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-06 06:09:33,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895105520] [2021-05-06 06:09:33,607 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 06:09:33,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:33,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 06:09:33,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-06 06:09:33,608 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:35,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:35,116 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2021-05-06 06:09:35,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 06:09:35,117 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-06 06:09:35,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:35,117 INFO L225 Difference]: With dead ends: 85 [2021-05-06 06:09:35,117 INFO L226 Difference]: Without dead ends: 85 [2021-05-06 06:09:35,118 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 1366.7ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 06:09:35,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-06 06:09:35,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-06 06:09:35,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:35,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-06 06:09:35,120 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2021-05-06 06:09:35,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:35,120 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-06 06:09:35,120 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:35,120 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-06 06:09:35,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 06:09:35,121 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:35,121 INFO L523 BasicCegarLoop]: trace histogram [36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:35,328 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:09:35,329 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:35,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:35,329 INFO L82 PathProgramCache]: Analyzing trace with hash 2078082198, now seen corresponding path program 26 times [2021-05-06 06:09:35,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:35,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248056222] [2021-05-06 06:09:35,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:35,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:35,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:35,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:35,912 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-06 06:09:35,912 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:35,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248056222] [2021-05-06 06:09:35,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248056222] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:35,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496387117] [2021-05-06 06:09:35,912 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 [2021-05-06 06:09:35,961 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:09:35,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:35,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 78 conjunts are in the unsatisfiable core [2021-05-06 06:09:35,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:36,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:09:36,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496387117] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:36,353 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:36,353 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 39] total 41 [2021-05-06 06:09:36,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765397357] [2021-05-06 06:09:36,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 06:09:36,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:36,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 06:09:36,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1532, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 06:09:36,354 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:38,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:38,234 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2021-05-06 06:09:38,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 06:09:38,235 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-06 06:09:38,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:38,235 INFO L225 Difference]: With dead ends: 87 [2021-05-06 06:09:38,235 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 06:09:38,236 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 1765.1ms TimeCoverageRelationStatistics Valid=253, Invalid=4577, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 06:09:38,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 06:09:38,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-06 06:09:38,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:38,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-06 06:09:38,238 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2021-05-06 06:09:38,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:38,238 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-06 06:09:38,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:38,239 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-06 06:09:38,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 06:09:38,239 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:38,239 INFO L523 BasicCegarLoop]: trace histogram [37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:38,461 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-06 06:09:38,461 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:38,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:38,462 INFO L82 PathProgramCache]: Analyzing trace with hash -1440640460, now seen corresponding path program 27 times [2021-05-06 06:09:38,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:38,462 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528838767] [2021-05-06 06:09:38,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:38,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:39,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:39,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:39,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 450 proven. 870 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-06 06:09:39,083 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:39,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528838767] [2021-05-06 06:09:39,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528838767] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:39,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080639468] [2021-05-06 06:09:39,084 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 [2021-05-06 06:09:39,340 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-06 06:09:39,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:39,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 06:09:39,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:40,167 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 493 proven. 64 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-05-06 06:09:40,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080639468] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:40,167 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:40,167 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 11] total 42 [2021-05-06 06:09:40,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148067587] [2021-05-06 06:09:40,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 06:09:40,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:40,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 06:09:40,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1534, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 06:09:40,169 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:42,941 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-06 06:09:44,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:44,633 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2021-05-06 06:09:44,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 06:09:44,634 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-06 06:09:44,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:44,634 INFO L225 Difference]: With dead ends: 93 [2021-05-06 06:09:44,634 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 06:09:44,635 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 83 SyntacticMatches, 4 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 822 ImplicationChecksByTransitivity, 4615.5ms TimeCoverageRelationStatistics Valid=555, Invalid=6087, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 06:09:44,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 06:09:44,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2021-05-06 06:09:44,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:44,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2021-05-06 06:09:44,637 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 85 [2021-05-06 06:09:44,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:44,637 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2021-05-06 06:09:44,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:44,637 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2021-05-06 06:09:44,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 06:09:44,638 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:44,638 INFO L523 BasicCegarLoop]: trace histogram [39, 30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:44,843 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:09:44,843 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:44,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:44,844 INFO L82 PathProgramCache]: Analyzing trace with hash 401045903, now seen corresponding path program 28 times [2021-05-06 06:09:44,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:44,844 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889085369] [2021-05-06 06:09:44,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:44,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:45,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:45,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:45,547 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-06 06:09:45,547 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:45,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889085369] [2021-05-06 06:09:45,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889085369] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:45,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206663067] [2021-05-06 06:09:45,548 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 [2021-05-06 06:09:45,598 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:09:45,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:45,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-06 06:09:45,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:45,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:45,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:45,816 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-06 06:09:45,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [206663067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:45,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:45,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-06 06:09:45,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533680375] [2021-05-06 06:09:45,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 06:09:45,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:45,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 06:09:45,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 06:09:45,818 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:47,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:47,667 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2021-05-06 06:09:47,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 06:09:47,667 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-06 06:09:47,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:47,668 INFO L225 Difference]: With dead ends: 93 [2021-05-06 06:09:47,668 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 06:09:47,668 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 470 ImplicationChecksByTransitivity, 1689.5ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 06:09:47,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 06:09:47,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-06 06:09:47,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:47,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-05-06 06:09:47,670 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2021-05-06 06:09:47,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:47,670 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-05-06 06:09:47,671 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:47,671 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-05-06 06:09:47,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 06:09:47,671 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:47,671 INFO L523 BasicCegarLoop]: trace histogram [40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:47,880 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-06 06:09:47,881 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:47,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:47,881 INFO L82 PathProgramCache]: Analyzing trace with hash -135866195, now seen corresponding path program 29 times [2021-05-06 06:09:47,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:47,881 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893923715] [2021-05-06 06:09:47,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:47,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:48,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:48,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:48,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 544 proven. 992 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-06 06:09:48,626 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:48,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893923715] [2021-05-06 06:09:48,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [893923715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:48,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096867350] [2021-05-06 06:09:48,626 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:09:56,090 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 41 check-sat command(s) [2021-05-06 06:09:56,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:09:56,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-06 06:09:56,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:09:56,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:56,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:09:56,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 442 proven. 1122 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-06 06:09:56,758 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096867350] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:56,758 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:09:56,758 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 36] total 38 [2021-05-06 06:09:56,759 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542924443] [2021-05-06 06:09:56,759 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 06:09:56,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:09:56,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 06:09:56,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1301, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 06:09:56,760 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:58,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:09:58,724 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2021-05-06 06:09:58,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 06:09:58,724 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-06 06:09:58,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:09:58,725 INFO L225 Difference]: With dead ends: 95 [2021-05-06 06:09:58,725 INFO L226 Difference]: Without dead ends: 95 [2021-05-06 06:09:58,725 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 70 SyntacticMatches, 21 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 2246.1ms TimeCoverageRelationStatistics Valid=265, Invalid=4565, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 06:09:58,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-06 06:09:58,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-05-06 06:09:58,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:58,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2021-05-06 06:09:58,727 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2021-05-06 06:09:58,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:09:58,728 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2021-05-06 06:09:58,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:09:58,728 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2021-05-06 06:09:58,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 06:09:58,728 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:09:58,728 INFO L523 BasicCegarLoop]: trace histogram [41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:09:58,934 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-06 06:09:58,934 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:09:58,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:09:58,934 INFO L82 PathProgramCache]: Analyzing trace with hash -712316853, now seen corresponding path program 30 times [2021-05-06 06:09:58,935 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:09:58,935 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600401135] [2021-05-06 06:09:58,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:09:58,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:59,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:09:59,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:09:59,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-06 06:09:59,614 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:09:59,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600401135] [2021-05-06 06:09:59,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600401135] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:09:59,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740803489] [2021-05-06 06:09:59,614 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:10:01,807 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 39 check-sat command(s) [2021-05-06 06:10:01,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:10:01,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-06 06:10:01,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:10:03,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 608 proven. 81 refuted. 0 times theorem prover too weak. 992 trivial. 0 not checked. [2021-05-06 06:10:03,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740803489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:03,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:10:03,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 12] total 46 [2021-05-06 06:10:03,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352856809] [2021-05-06 06:10:03,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 06:10:03,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:10:03,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 06:10:03,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1862, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 06:10:03,129 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 46 states, 46 states have (on average 2.152173913043478) internal successors, (99), 45 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:08,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:10:08,787 INFO L93 Difference]: Finished difference Result 101 states and 104 transitions. [2021-05-06 06:10:08,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 06:10:08,788 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.152173913043478) internal successors, (99), 45 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 06:10:08,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:10:08,788 INFO L225 Difference]: With dead ends: 101 [2021-05-06 06:10:08,788 INFO L226 Difference]: Without dead ends: 101 [2021-05-06 06:10:08,789 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 89 SyntacticMatches, 6 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1000 ImplicationChecksByTransitivity, 5672.5ms TimeCoverageRelationStatistics Valid=614, Invalid=7396, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 06:10:08,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-06 06:10:08,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2021-05-06 06:10:08,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:08,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2021-05-06 06:10:08,791 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 93 [2021-05-06 06:10:08,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:10:08,791 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2021-05-06 06:10:08,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 2.152173913043478) internal successors, (99), 45 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:08,791 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2021-05-06 06:10:08,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 06:10:08,792 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:10:08,792 INFO L523 BasicCegarLoop]: trace histogram [43, 33, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:10:08,997 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-06 06:10:08,997 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:10:08,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:10:08,997 INFO L82 PathProgramCache]: Analyzing trace with hash 505554918, now seen corresponding path program 31 times [2021-05-06 06:10:08,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:10:08,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462041666] [2021-05-06 06:10:08,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:10:09,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:09,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:10:09,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:09,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-06 06:10:09,728 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:10:09,728 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462041666] [2021-05-06 06:10:09,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462041666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:09,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296105561] [2021-05-06 06:10:09,729 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:10:09,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:09,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-06 06:10:09,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:10:09,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:10:09,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:10:10,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-06 06:10:10,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296105561] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:10,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:10:10,011 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-06 06:10:10,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983150318] [2021-05-06 06:10:10,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 06:10:10,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:10:10,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 06:10:10,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 06:10:10,012 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:12,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:10:12,044 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2021-05-06 06:10:12,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 06:10:12,045 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-06 06:10:12,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:10:12,045 INFO L225 Difference]: With dead ends: 101 [2021-05-06 06:10:12,045 INFO L226 Difference]: Without dead ends: 101 [2021-05-06 06:10:12,046 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 1822.2ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 06:10:12,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-06 06:10:12,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-05-06 06:10:12,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:12,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-05-06 06:10:12,050 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2021-05-06 06:10:12,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:10:12,050 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-05-06 06:10:12,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:12,050 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-05-06 06:10:12,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-06 06:10:12,051 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:10:12,051 INFO L523 BasicCegarLoop]: trace histogram [44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:10:12,251 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-06 06:10:12,251 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:10:12,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:10:12,252 INFO L82 PathProgramCache]: Analyzing trace with hash 1415022852, now seen corresponding path program 32 times [2021-05-06 06:10:12,252 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:10:12,252 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981316638] [2021-05-06 06:10:12,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:10:12,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:12,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:10:12,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:12,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 665 proven. 1190 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-06 06:10:12,962 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:10:12,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981316638] [2021-05-06 06:10:12,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981316638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:12,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410824124] [2021-05-06 06:10:12,962 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:10:13,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:10:13,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:10:13,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-06 06:10:13,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:10:13,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:10:13,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410824124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:13,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:10:13,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 47] total 49 [2021-05-06 06:10:13,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563706968] [2021-05-06 06:10:13,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 06:10:13,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:10:13,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 06:10:13,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2222, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 06:10:13,546 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:16,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:10:16,172 INFO L93 Difference]: Finished difference Result 103 states and 105 transitions. [2021-05-06 06:10:16,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 06:10:16,172 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2021-05-06 06:10:16,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:10:16,173 INFO L225 Difference]: With dead ends: 103 [2021-05-06 06:10:16,173 INFO L226 Difference]: Without dead ends: 103 [2021-05-06 06:10:16,174 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 2342.8ms TimeCoverageRelationStatistics Valid=305, Invalid=6667, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 06:10:16,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-06 06:10:16,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-06 06:10:16,176 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) [2021-05-06 06:10:16,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-06 06:10:16,176 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2021-05-06 06:10:16,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:10:16,176 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-06 06:10:16,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:16,177 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-06 06:10:16,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 06:10:16,177 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:10:16,177 INFO L523 BasicCegarLoop]: trace histogram [45, 35, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:10:16,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-06 06:10:16,393 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:10:16,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:10:16,393 INFO L82 PathProgramCache]: Analyzing trace with hash -759620958, now seen corresponding path program 33 times [2021-05-06 06:10:16,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:10:16,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195669226] [2021-05-06 06:10:16,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:10:16,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:17,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:10:17,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:17,242 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 684 proven. 1260 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-06 06:10:17,242 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:10:17,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195669226] [2021-05-06 06:10:17,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [195669226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:17,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903525339] [2021-05-06 06:10:17,242 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:10:17,520 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-06 06:10:17,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:10:17,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-06 06:10:17,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:10:17,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:10:18,219 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 735 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-06 06:10:18,219 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1903525339] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:18,219 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:10:18,219 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 13] total 50 [2021-05-06 06:10:18,219 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537962631] [2021-05-06 06:10:18,220 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 06:10:18,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:10:18,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 06:10:18,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=348, Invalid=2102, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 06:10:18,220 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:21,283 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-06 06:10:21,979 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-06 06:10:23,148 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:10:24,544 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-06 06:10:25,855 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:10:26,949 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-06 06:10:27,990 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-06 06:10:30,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:10:30,057 INFO L93 Difference]: Finished difference Result 109 states and 112 transitions. [2021-05-06 06:10:30,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 06:10:30,057 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-06 06:10:30,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:10:30,058 INFO L225 Difference]: With dead ends: 109 [2021-05-06 06:10:30,058 INFO L226 Difference]: Without dead ends: 109 [2021-05-06 06:10:30,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1200 ImplicationChecksByTransitivity, 11865.2ms TimeCoverageRelationStatistics Valid=953, Invalid=8553, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 06:10:30,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-06 06:10:30,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2021-05-06 06:10:30,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:30,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2021-05-06 06:10:30,060 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 101 [2021-05-06 06:10:30,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:10:30,060 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2021-05-06 06:10:30,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:30,061 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2021-05-06 06:10:30,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-06 06:10:30,061 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:10:30,061 INFO L523 BasicCegarLoop]: trace histogram [47, 36, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:10:30,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-06 06:10:30,266 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:10:30,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:10:30,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1430674819, now seen corresponding path program 34 times [2021-05-06 06:10:30,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:10:30,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512709777] [2021-05-06 06:10:30,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:10:30,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:31,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:10:31,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:31,066 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-06 06:10:31,066 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:10:31,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512709777] [2021-05-06 06:10:31,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512709777] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:31,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398489889] [2021-05-06 06:10:31,066 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:10:31,144 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:10:31,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:10:31,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-06 06:10:31,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:10:31,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:10:31,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:10:31,362 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-06 06:10:31,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398489889] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:31,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:10:31,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-06 06:10:31,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140016100] [2021-05-06 06:10:31,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 06:10:31,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:10:31,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 06:10:31,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 06:10:31,363 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:33,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:10:33,789 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2021-05-06 06:10:33,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 06:10:33,789 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-05-06 06:10:33,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:10:33,790 INFO L225 Difference]: With dead ends: 109 [2021-05-06 06:10:33,790 INFO L226 Difference]: Without dead ends: 109 [2021-05-06 06:10:33,790 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 2059.1ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 06:10:33,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-06 06:10:33,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-06 06:10:33,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:33,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-06 06:10:33,792 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2021-05-06 06:10:33,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:10:33,793 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-06 06:10:33,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:33,793 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-06 06:10:33,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 06:10:33,793 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:10:33,793 INFO L523 BasicCegarLoop]: trace histogram [48, 37, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:10:33,996 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-06 06:10:33,997 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:10:33,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:10:33,997 INFO L82 PathProgramCache]: Analyzing trace with hash 704841115, now seen corresponding path program 35 times [2021-05-06 06:10:33,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:10:33,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596198422] [2021-05-06 06:10:33,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:10:34,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:34,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:10:34,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:34,826 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-06 06:10:34,826 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:10:34,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596198422] [2021-05-06 06:10:34,826 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1596198422] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:34,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095510497] [2021-05-06 06:10:34,827 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:10:55,089 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 49 check-sat command(s) [2021-05-06 06:10:55,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:10:55,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-06 06:10:55,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:10:55,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:10:55,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:10:55,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 741 proven. 1482 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-06 06:10:55,420 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095510497] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:55,420 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:10:55,420 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 43 [2021-05-06 06:10:55,420 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523208971] [2021-05-06 06:10:55,421 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 06:10:55,421 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:10:55,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 06:10:55,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1685, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 06:10:55,421 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:57,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:10:57,955 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-05-06 06:10:57,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 06:10:57,956 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-06 06:10:57,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:10:57,956 INFO L225 Difference]: With dead ends: 111 [2021-05-06 06:10:57,956 INFO L226 Difference]: Without dead ends: 111 [2021-05-06 06:10:57,957 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 104 SyntacticMatches, 4 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 2218.3ms TimeCoverageRelationStatistics Valid=311, Invalid=6169, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 06:10:57,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-06 06:10:57,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-06 06:10:57,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:57,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-06 06:10:57,958 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2021-05-06 06:10:57,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:10:57,959 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-06 06:10:57,959 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:10:57,959 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-06 06:10:57,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-06 06:10:57,959 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:10:57,959 INFO L523 BasicCegarLoop]: trace histogram [49, 38, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:10:58,164 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-06 06:10:58,165 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:10:58,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:10:58,165 INFO L82 PathProgramCache]: Analyzing trace with hash -58713799, now seen corresponding path program 36 times [2021-05-06 06:10:58,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:10:58,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321617204] [2021-05-06 06:10:58,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:10:58,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:59,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:10:59,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:10:59,120 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 819 proven. 1482 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-06 06:10:59,120 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:10:59,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321617204] [2021-05-06 06:10:59,120 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [321617204] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:10:59,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1945040406] [2021-05-06 06:10:59,120 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:11:04,597 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 47 check-sat command(s) [2021-05-06 06:11:04,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:11:04,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-06 06:11:04,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:11:06,255 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 874 proven. 121 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2021-05-06 06:11:06,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1945040406] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:11:06,255 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:11:06,255 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 14] total 54 [2021-05-06 06:11:06,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057981054] [2021-05-06 06:11:06,256 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 06:11:06,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:11:06,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 06:11:06,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=2527, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 06:11:06,256 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:10,018 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-06 06:11:10,847 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-06 06:11:11,922 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-06 06:11:13,342 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:11:15,329 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-06 06:11:18,285 WARN L205 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-06 06:11:19,997 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:11:20,878 WARN L205 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-06 06:11:22,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:11:22,047 INFO L93 Difference]: Finished difference Result 117 states and 120 transitions. [2021-05-06 06:11:22,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 06:11:22,048 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-06 06:11:22,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:11:22,048 INFO L225 Difference]: With dead ends: 117 [2021-05-06 06:11:22,048 INFO L226 Difference]: Without dead ends: 117 [2021-05-06 06:11:22,049 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 104 SyntacticMatches, 7 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1431 ImplicationChecksByTransitivity, 16328.3ms TimeCoverageRelationStatistics Valid=933, Invalid=10197, Unknown=0, NotChecked=0, Total=11130 [2021-05-06 06:11:22,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-06 06:11:22,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2021-05-06 06:11:22,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:22,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-06 06:11:22,050 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 109 [2021-05-06 06:11:22,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:11:22,051 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-06 06:11:22,051 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:22,051 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-06 06:11:22,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 06:11:22,051 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:11:22,052 INFO L523 BasicCegarLoop]: trace histogram [51, 39, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:11:22,257 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:11:22,257 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:11:22,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:11:22,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1967511892, now seen corresponding path program 37 times [2021-05-06 06:11:22,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:11:22,258 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730120011] [2021-05-06 06:11:22,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:11:22,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:11:23,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:11:23,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:11:23,138 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-06 06:11:23,138 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:11:23,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730120011] [2021-05-06 06:11:23,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730120011] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:11:23,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252414398] [2021-05-06 06:11:23,138 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:11:23,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:11:23,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-06 06:11:23,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:11:23,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:11:23,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:11:23,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-06 06:11:23,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [252414398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:11:23,424 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:11:23,424 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-06 06:11:23,424 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461890538] [2021-05-06 06:11:23,424 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 06:11:23,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:11:23,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 06:11:23,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 06:11:23,425 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:26,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:11:26,176 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2021-05-06 06:11:26,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 06:11:26,176 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-06 06:11:26,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:11:26,177 INFO L225 Difference]: With dead ends: 117 [2021-05-06 06:11:26,177 INFO L226 Difference]: Without dead ends: 117 [2021-05-06 06:11:26,177 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 785 ImplicationChecksByTransitivity, 2307.2ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 06:11:26,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-06 06:11:26,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-05-06 06:11:26,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:26,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-05-06 06:11:26,179 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 113 [2021-05-06 06:11:26,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:11:26,179 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-05-06 06:11:26,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:26,180 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-05-06 06:11:26,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 06:11:26,180 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:11:26,180 INFO L523 BasicCegarLoop]: trace histogram [52, 40, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:11:26,403 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:11:26,403 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:11:26,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:11:26,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1921072754, now seen corresponding path program 38 times [2021-05-06 06:11:26,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:11:26,404 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187274693] [2021-05-06 06:11:26,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:11:26,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:11:27,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:11:27,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:11:27,313 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 943 proven. 1640 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-06 06:11:27,314 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:11:27,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187274693] [2021-05-06 06:11:27,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187274693] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:11:27,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149000250] [2021-05-06 06:11:27,314 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:11:27,378 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:11:27,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:11:27,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 110 conjunts are in the unsatisfiable core [2021-05-06 06:11:27,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:11:28,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:11:28,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149000250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:11:28,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:11:28,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 55] total 57 [2021-05-06 06:11:28,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766791549] [2021-05-06 06:11:28,093 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 06:11:28,093 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:11:28,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 06:11:28,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=3040, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 06:11:28,094 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:31,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:11:31,524 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2021-05-06 06:11:31,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 06:11:31,525 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-06 06:11:31,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:11:31,525 INFO L225 Difference]: With dead ends: 119 [2021-05-06 06:11:31,525 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 06:11:31,526 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 103 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 3078.8ms TimeCoverageRelationStatistics Valid=357, Invalid=9149, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 06:11:31,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 06:11:31,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-05-06 06:11:31,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 114 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:31,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-05-06 06:11:31,528 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 115 [2021-05-06 06:11:31,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:11:31,528 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-05-06 06:11:31,528 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:31,528 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-05-06 06:11:31,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-06 06:11:31,529 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:11:31,529 INFO L523 BasicCegarLoop]: trace histogram [53, 41, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:11:31,736 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-06 06:11:31,737 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:11:31,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:11:31,737 INFO L82 PathProgramCache]: Analyzing trace with hash 242734096, now seen corresponding path program 39 times [2021-05-06 06:11:31,737 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:11:31,737 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251808872] [2021-05-06 06:11:31,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:11:31,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:11:32,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:11:32,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:11:32,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 966 proven. 1722 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-06 06:11:32,677 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:11:32,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251808872] [2021-05-06 06:11:32,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251808872] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:11:32,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966780435] [2021-05-06 06:11:32,678 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:11:33,015 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-05-06 06:11:33,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:11:33,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-06 06:11:33,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:11:34,067 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 1025 proven. 144 refuted. 0 times theorem prover too weak. 1640 trivial. 0 not checked. [2021-05-06 06:11:34,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [966780435] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:11:34,067 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:11:34,067 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15] total 58 [2021-05-06 06:11:34,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975916760] [2021-05-06 06:11:34,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 06:11:34,068 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:11:34,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 06:11:34,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=2842, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 06:11:34,068 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:37,441 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 45 [2021-05-06 06:11:38,252 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:11:39,661 WARN L205 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-06 06:11:41,428 WARN L205 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-06 06:11:44,365 WARN L205 SmtUtils]: Spent 410.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-06 06:11:47,373 WARN L205 SmtUtils]: Spent 548.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-06 06:11:49,305 WARN L205 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-06 06:11:51,032 WARN L205 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:11:52,390 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-06 06:11:54,206 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-06 06:11:55,018 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-06 06:11:56,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:11:56,512 INFO L93 Difference]: Finished difference Result 125 states and 128 transitions. [2021-05-06 06:11:56,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 06:11:56,512 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 117 [2021-05-06 06:11:56,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:11:56,513 INFO L225 Difference]: With dead ends: 125 [2021-05-06 06:11:56,513 INFO L226 Difference]: Without dead ends: 125 [2021-05-06 06:11:56,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1639 ImplicationChecksByTransitivity, 22633.0ms TimeCoverageRelationStatistics Valid=1253, Invalid=11629, Unknown=0, NotChecked=0, Total=12882 [2021-05-06 06:11:56,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-06 06:11:56,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2021-05-06 06:11:56,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:56,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 125 transitions. [2021-05-06 06:11:56,516 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 125 transitions. Word has length 117 [2021-05-06 06:11:56,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:11:56,516 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 125 transitions. [2021-05-06 06:11:56,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:11:56,516 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 125 transitions. [2021-05-06 06:11:56,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-06 06:11:56,517 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:11:56,517 INFO L523 BasicCegarLoop]: trace histogram [55, 42, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:11:56,721 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:11:56,722 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:11:56,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:11:56,722 INFO L82 PathProgramCache]: Analyzing trace with hash 1965210731, now seen corresponding path program 40 times [2021-05-06 06:11:56,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:11:56,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134025873] [2021-05-06 06:11:56,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:11:56,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:11:57,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:11:57,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:11:57,796 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-06 06:11:57,796 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:11:57,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134025873] [2021-05-06 06:11:57,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134025873] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:11:57,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835859854] [2021-05-06 06:11:57,796 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:11:57,854 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:11:57,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:11:57,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-06 06:11:57,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:11:58,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:11:58,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:11:58,087 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-06 06:11:58,087 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835859854] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:11:58,087 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:11:58,087 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-06 06:11:58,087 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994271938] [2021-05-06 06:11:58,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 06:11:58,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:11:58,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 06:11:58,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 06:11:58,088 INFO L87 Difference]: Start difference. First operand 123 states and 125 transitions. Second operand has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:12:01,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:12:01,074 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-05-06 06:12:01,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 06:12:01,075 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 121 [2021-05-06 06:12:01,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:12:01,075 INFO L225 Difference]: With dead ends: 125 [2021-05-06 06:12:01,075 INFO L226 Difference]: Without dead ends: 125 [2021-05-06 06:12:01,076 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 2664.0ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 06:12:01,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-06 06:12:01,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-05-06 06:12:01,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:12:01,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2021-05-06 06:12:01,078 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 121 [2021-05-06 06:12:01,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:12:01,078 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2021-05-06 06:12:01,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:12:01,079 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2021-05-06 06:12:01,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-06 06:12:01,079 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:12:01,079 INFO L523 BasicCegarLoop]: trace histogram [56, 43, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:12:01,302 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:12:01,302 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:12:01,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:12:01,302 INFO L82 PathProgramCache]: Analyzing trace with hash 1731077001, now seen corresponding path program 41 times [2021-05-06 06:12:01,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:12:01,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495003441] [2021-05-06 06:12:01,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:12:01,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:12:02,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:12:02,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:12:02,353 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 1100 proven. 1892 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-06 06:12:02,353 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:12:02,353 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495003441] [2021-05-06 06:12:02,354 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [495003441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:12:02,354 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104025623] [2021-05-06 06:12:02,354 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:12:34,228 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 57 check-sat command(s) [2021-05-06 06:12:34,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:12:34,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 134 conjunts are in the unsatisfiable core [2021-05-06 06:12:34,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:12:35,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:12:35,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:12:35,696 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 893 proven. 2162 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-06 06:12:35,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104025623] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:12:35,696 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:12:35,697 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 49] total 51 [2021-05-06 06:12:35,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100890033] [2021-05-06 06:12:35,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 06:12:35,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:12:35,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 06:12:35,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2407, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 06:12:35,698 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:12:39,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:12:39,093 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2021-05-06 06:12:39,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 06:12:39,093 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 123 [2021-05-06 06:12:39,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:12:39,094 INFO L225 Difference]: With dead ends: 127 [2021-05-06 06:12:39,094 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 06:12:39,095 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 82 SyntacticMatches, 40 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 3956.1ms TimeCoverageRelationStatistics Valid=363, Invalid=8567, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 06:12:39,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 06:12:39,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-06 06:12:39,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 122 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:12:39,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2021-05-06 06:12:39,097 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 123 [2021-05-06 06:12:39,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:12:39,097 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2021-05-06 06:12:39,097 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:12:39,097 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2021-05-06 06:12:39,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-06 06:12:39,098 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:12:39,098 INFO L523 BasicCegarLoop]: trace histogram [57, 44, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:12:39,305 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-06 06:12:39,306 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:12:39,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:12:39,306 INFO L82 PathProgramCache]: Analyzing trace with hash 66861863, now seen corresponding path program 42 times [2021-05-06 06:12:39,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:12:39,306 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968762144] [2021-05-06 06:12:39,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:12:39,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:12:40,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:12:40,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:12:40,389 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1125 proven. 1980 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-06 06:12:40,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:12:40,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968762144] [2021-05-06 06:12:40,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1968762144] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:12:40,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334216894] [2021-05-06 06:12:40,389 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:12:50,785 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2021-05-06 06:12:50,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:12:50,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-06 06:12:50,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:12:53,134 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1188 proven. 169 refuted. 0 times theorem prover too weak. 1892 trivial. 0 not checked. [2021-05-06 06:12:53,135 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334216894] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:12:53,135 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:12:53,135 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 16] total 62 [2021-05-06 06:12:53,135 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668932130] [2021-05-06 06:12:53,135 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 06:12:53,135 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:12:53,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 06:12:53,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=3494, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 06:12:53,136 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 62 states, 62 states have (on average 2.1129032258064515) internal successors, (131), 61 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) [2021-05-06 06:13:03,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:13:03,689 INFO L93 Difference]: Finished difference Result 133 states and 136 transitions. [2021-05-06 06:13:03,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 06:13:03,689 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.1129032258064515) internal successors, (131), 61 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 125 [2021-05-06 06:13:03,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:13:03,690 INFO L225 Difference]: With dead ends: 133 [2021-05-06 06:13:03,690 INFO L226 Difference]: Without dead ends: 133 [2021-05-06 06:13:03,691 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 120 SyntacticMatches, 7 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1844 ImplicationChecksByTransitivity, 10847.3ms TimeCoverageRelationStatistics Valid=850, Invalid=13912, Unknown=0, NotChecked=0, Total=14762 [2021-05-06 06:13:03,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-06 06:13:03,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2021-05-06 06:13:03,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:03,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-05-06 06:13:03,693 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 125 [2021-05-06 06:13:03,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:13:03,693 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-05-06 06:13:03,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 2.1129032258064515) internal successors, (131), 61 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) [2021-05-06 06:13:03,693 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-05-06 06:13:03,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-06 06:13:03,694 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:13:03,694 INFO L523 BasicCegarLoop]: trace histogram [59, 45, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:13:03,897 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-06 06:13:03,897 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:13:03,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:13:03,897 INFO L82 PathProgramCache]: Analyzing trace with hash 7355330, now seen corresponding path program 43 times [2021-05-06 06:13:03,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:13:03,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391341704] [2021-05-06 06:13:03,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:13:03,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:13:05,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:13:05,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:13:05,032 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-06 06:13:05,032 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:13:05,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391341704] [2021-05-06 06:13:05,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391341704] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:13:05,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129021769] [2021-05-06 06:13:05,032 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:13:05,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:13:05,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-06 06:13:05,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:13:05,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:13:05,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:13:05,336 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-06 06:13:05,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2129021769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:13:05,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:13:05,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-06 06:13:05,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004881253] [2021-05-06 06:13:05,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 06:13:05,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:13:05,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 06:13:05,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 06:13:05,337 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:08,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:13:08,836 INFO L93 Difference]: Finished difference Result 133 states and 135 transitions. [2021-05-06 06:13:08,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 06:13:08,838 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 129 [2021-05-06 06:13:08,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:13:08,838 INFO L225 Difference]: With dead ends: 133 [2021-05-06 06:13:08,838 INFO L226 Difference]: Without dead ends: 133 [2021-05-06 06:13:08,839 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 2883.6ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 06:13:08,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-06 06:13:08,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-05-06 06:13:08,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:08,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-06 06:13:08,841 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 129 [2021-05-06 06:13:08,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:13:08,841 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-06 06:13:08,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:08,842 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-06 06:13:08,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-06 06:13:08,842 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:13:08,842 INFO L523 BasicCegarLoop]: trace histogram [60, 46, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:13:09,065 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-06 06:13:09,065 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:13:09,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:13:09,065 INFO L82 PathProgramCache]: Analyzing trace with hash -1607883552, now seen corresponding path program 44 times [2021-05-06 06:13:09,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:13:09,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410647954] [2021-05-06 06:13:09,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:13:09,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:13:10,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:13:10,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:13:10,225 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 1269 proven. 2162 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-06 06:13:10,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:13:10,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410647954] [2021-05-06 06:13:10,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [410647954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:13:10,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466248189] [2021-05-06 06:13:10,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:13:10,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:13:10,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:13:10,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 126 conjunts are in the unsatisfiable core [2021-05-06 06:13:10,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:13:11,178 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:13:11,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466248189] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:13:11,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:13:11,178 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 63] total 65 [2021-05-06 06:13:11,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266567641] [2021-05-06 06:13:11,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 06:13:11,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:13:11,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 06:13:11,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=3986, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 06:13:11,179 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:15,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:13:15,564 INFO L93 Difference]: Finished difference Result 135 states and 137 transitions. [2021-05-06 06:13:15,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 06:13:15,564 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-06 06:13:15,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:13:15,565 INFO L225 Difference]: With dead ends: 135 [2021-05-06 06:13:15,565 INFO L226 Difference]: Without dead ends: 135 [2021-05-06 06:13:15,566 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 3900.7ms TimeCoverageRelationStatistics Valid=409, Invalid=12023, Unknown=0, NotChecked=0, Total=12432 [2021-05-06 06:13:15,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-06 06:13:15,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-05-06 06:13:15,567 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) [2021-05-06 06:13:15,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-06 06:13:15,568 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 131 [2021-05-06 06:13:15,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:13:15,568 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-06 06:13:15,568 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:15,568 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-06 06:13:15,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-06 06:13:15,569 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:13:15,569 INFO L523 BasicCegarLoop]: trace histogram [61, 47, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:13:15,784 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:13:15,785 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:13:15,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:13:15,785 INFO L82 PathProgramCache]: Analyzing trace with hash 925711998, now seen corresponding path program 45 times [2021-05-06 06:13:15,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:13:15,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634787376] [2021-05-06 06:13:15,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:13:15,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:13:17,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:13:17,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:13:17,013 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1296 proven. 2256 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-06 06:13:17,013 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:13:17,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634787376] [2021-05-06 06:13:17,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634787376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:13:17,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468704653] [2021-05-06 06:13:17,014 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:13:17,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-05-06 06:13:17,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:13:17,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-06 06:13:17,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:13:20,205 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1363 proven. 196 refuted. 0 times theorem prover too weak. 2162 trivial. 0 not checked. [2021-05-06 06:13:20,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468704653] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:13:20,205 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:13:20,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 17] total 66 [2021-05-06 06:13:20,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133447939] [2021-05-06 06:13:20,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-06 06:13:20,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:13:20,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-06 06:13:20,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=386, Invalid=3904, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 06:13:20,206 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:26,039 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-06 06:13:26,938 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-06 06:13:28,282 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-06 06:13:30,105 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:13:32,402 WARN L205 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:13:34,386 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:13:36,164 WARN L205 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:13:38,583 WARN L205 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:13:40,400 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:13:41,507 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-06 06:13:42,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:13:42,905 INFO L93 Difference]: Finished difference Result 141 states and 144 transitions. [2021-05-06 06:13:42,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 06:13:42,906 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-06 06:13:42,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:13:42,906 INFO L225 Difference]: With dead ends: 141 [2021-05-06 06:13:42,906 INFO L226 Difference]: Without dead ends: 141 [2021-05-06 06:13:42,907 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 127 SyntacticMatches, 8 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2133 ImplicationChecksByTransitivity, 23620.5ms TimeCoverageRelationStatistics Valid=1089, Invalid=15681, Unknown=0, NotChecked=0, Total=16770 [2021-05-06 06:13:42,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-06 06:13:42,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2021-05-06 06:13:42,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:42,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-06 06:13:42,909 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 133 [2021-05-06 06:13:42,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:13:42,910 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-06 06:13:42,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:42,910 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-06 06:13:42,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-06 06:13:42,910 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:13:42,910 INFO L523 BasicCegarLoop]: trace histogram [63, 48, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:13:43,115 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-06 06:13:43,115 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:13:43,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:13:43,115 INFO L82 PathProgramCache]: Analyzing trace with hash 722618201, now seen corresponding path program 46 times [2021-05-06 06:13:43,116 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:13:43,116 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454158656] [2021-05-06 06:13:43,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:13:43,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:13:44,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:13:44,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:13:44,338 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-06 06:13:44,338 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:13:44,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454158656] [2021-05-06 06:13:44,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454158656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:13:44,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345495973] [2021-05-06 06:13:44,338 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:13:44,408 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:13:44,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:13:44,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-06 06:13:44,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:13:44,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:13:44,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:13:44,676 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-06 06:13:44,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345495973] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:13:44,676 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:13:44,677 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-06 06:13:44,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939352669] [2021-05-06 06:13:44,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 06:13:44,677 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:13:44,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 06:13:44,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 06:13:44,678 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:48,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:13:48,579 INFO L93 Difference]: Finished difference Result 141 states and 143 transitions. [2021-05-06 06:13:48,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 06:13:48,579 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-06 06:13:48,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:13:48,580 INFO L225 Difference]: With dead ends: 141 [2021-05-06 06:13:48,580 INFO L226 Difference]: Without dead ends: 141 [2021-05-06 06:13:48,580 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 3199.7ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 06:13:48,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-06 06:13:48,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-05-06 06:13:48,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:48,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-05-06 06:13:48,582 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 137 [2021-05-06 06:13:48,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:13:48,583 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-05-06 06:13:48,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:13:48,583 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-05-06 06:13:48,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-06 06:13:48,583 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:13:48,583 INFO L523 BasicCegarLoop]: trace histogram [64, 49, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:13:48,806 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:13:48,807 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:13:48,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:13:48,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1935127159, now seen corresponding path program 47 times [2021-05-06 06:13:48,807 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:13:48,807 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751280801] [2021-05-06 06:13:48,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:13:48,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:13:50,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:13:50,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:13:50,123 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1450 proven. 2450 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-06 06:13:50,123 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:13:50,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751280801] [2021-05-06 06:13:50,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1751280801] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:13:50,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599867376] [2021-05-06 06:13:50,123 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:14:34,759 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 65 check-sat command(s) [2021-05-06 06:14:34,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:14:34,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-06 06:14:34,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:14:35,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:14:35,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:14:35,341 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1045 proven. 2970 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-06 06:14:35,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599867376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:14:35,342 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:14:35,342 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 57] total 59 [2021-05-06 06:14:35,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357779618] [2021-05-06 06:14:35,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 06:14:35,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:14:35,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 06:14:35,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=3257, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 06:14:35,343 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:14:39,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:14:39,787 INFO L93 Difference]: Finished difference Result 143 states and 145 transitions. [2021-05-06 06:14:39,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 06:14:39,787 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 139 [2021-05-06 06:14:39,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:14:39,788 INFO L225 Difference]: With dead ends: 143 [2021-05-06 06:14:39,788 INFO L226 Difference]: Without dead ends: 143 [2021-05-06 06:14:39,788 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 131 SyntacticMatches, 5 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 3790.3ms TimeCoverageRelationStatistics Valid=415, Invalid=11357, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 06:14:39,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-06 06:14:39,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-05-06 06:14:39,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:14:39,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-06 06:14:39,790 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 139 [2021-05-06 06:14:39,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:14:39,790 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-06 06:14:39,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:14:39,791 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-06 06:14:39,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-06 06:14:39,791 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:14:39,791 INFO L523 BasicCegarLoop]: trace histogram [65, 50, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:14:39,999 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:14:40,000 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:14:40,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:14:40,000 INFO L82 PathProgramCache]: Analyzing trace with hash -1074868715, now seen corresponding path program 48 times [2021-05-06 06:14:40,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:14:40,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33165335] [2021-05-06 06:14:40,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:14:40,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:14:41,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:14:41,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:14:41,324 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1479 proven. 2550 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-06 06:14:41,325 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:14:41,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33165335] [2021-05-06 06:14:41,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [33165335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:14:41,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454709840] [2021-05-06 06:14:41,325 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:15:10,950 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 63 check-sat command(s) [2021-05-06 06:15:10,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:15:10,960 WARN L261 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 200 conjunts are in the unsatisfiable core [2021-05-06 06:15:10,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:15:11,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:15:11,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:15:11,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:15:11,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:15:15,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:15:15,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:15:20,521 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1319 proven. 2862 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-06 06:15:20,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454709840] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:15:20,522 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:15:20,522 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 60] total 98 [2021-05-06 06:15:20,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807080599] [2021-05-06 06:15:20,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2021-05-06 06:15:20,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:15:20,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-05-06 06:15:20,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1664, Invalid=7842, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 06:15:20,523 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 98 states, 98 states have (on average 2.0816326530612246) internal successors, (204), 97 states have internal predecessors, (204), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:15:32,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:15:32,753 INFO L93 Difference]: Finished difference Result 203 states and 233 transitions. [2021-05-06 06:15:32,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-05-06 06:15:32,753 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 2.0816326530612246) internal successors, (204), 97 states have internal predecessors, (204), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 141 [2021-05-06 06:15:32,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:15:32,754 INFO L225 Difference]: With dead ends: 203 [2021-05-06 06:15:32,754 INFO L226 Difference]: Without dead ends: 203 [2021-05-06 06:15:32,756 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 84 SyntacticMatches, 32 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7535 ImplicationChecksByTransitivity, 18366.7ms TimeCoverageRelationStatistics Valid=5015, Invalid=32041, Unknown=0, NotChecked=0, Total=37056 [2021-05-06 06:15:32,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-05-06 06:15:32,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 147. [2021-05-06 06:15:32,758 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) [2021-05-06 06:15:32,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2021-05-06 06:15:32,758 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 141 [2021-05-06 06:15:32,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:15:32,758 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2021-05-06 06:15:32,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 98 states, 98 states have (on average 2.0816326530612246) internal successors, (204), 97 states have internal predecessors, (204), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:15:32,759 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2021-05-06 06:15:32,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-06 06:15:32,759 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:15:32,759 INFO L523 BasicCegarLoop]: trace histogram [67, 51, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:15:32,966 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-06 06:15:32,967 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:15:32,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:15:32,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1706086192, now seen corresponding path program 49 times [2021-05-06 06:15:32,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:15:32,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186685475] [2021-05-06 06:15:32,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:15:33,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:15:34,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:15:34,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:15:34,401 INFO L134 CoverageAnalysis]: Checked inductivity of 4489 backedges. 1612 proven. 2652 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-06 06:15:34,401 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:15:34,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186685475] [2021-05-06 06:15:34,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186685475] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:15:34,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766123607] [2021-05-06 06:15:34,402 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:15:34,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:15:34,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-06 06:15:34,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:15:34,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:15:34,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:15:34,793 INFO L134 CoverageAnalysis]: Checked inductivity of 4489 backedges. 1612 proven. 2652 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-06 06:15:34,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766123607] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:15:34,793 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:15:34,793 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-06 06:15:34,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576203604] [2021-05-06 06:15:34,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-06 06:15:34,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:15:34,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-06 06:15:34,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 06:15:34,794 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:15:39,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:15:39,100 INFO L93 Difference]: Finished difference Result 149 states and 151 transitions. [2021-05-06 06:15:39,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 06:15:39,101 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 145 [2021-05-06 06:15:39,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:15:39,102 INFO L225 Difference]: With dead ends: 149 [2021-05-06 06:15:39,102 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 06:15:39,102 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 3569.0ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-06 06:15:39,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 06:15:39,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-05-06 06:15:39,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:15:39,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2021-05-06 06:15:39,104 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 145 [2021-05-06 06:15:39,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:15:39,105 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2021-05-06 06:15:39,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:15:39,105 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2021-05-06 06:15:39,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-06 06:15:39,105 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:15:39,106 INFO L523 BasicCegarLoop]: trace histogram [68, 52, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:15:39,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:15:39,313 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:15:39,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:15:39,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1822409650, now seen corresponding path program 50 times [2021-05-06 06:15:39,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:15:39,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461181624] [2021-05-06 06:15:39,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:15:39,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:15:40,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:15:40,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:15:40,729 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 1643 proven. 2756 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-06 06:15:40,729 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:15:40,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461181624] [2021-05-06 06:15:40,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461181624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:15:40,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166277047] [2021-05-06 06:15:40,729 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:15:40,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:15:40,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:15:40,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 142 conjunts are in the unsatisfiable core [2021-05-06 06:15:40,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:15:41,942 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:15:41,942 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [166277047] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:15:41,943 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:15:41,943 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 71] total 73 [2021-05-06 06:15:41,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016054743] [2021-05-06 06:15:41,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-06 06:15:41,943 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:15:41,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-06 06:15:41,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=5060, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 06:15:41,944 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:15:47,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:15:47,566 INFO L93 Difference]: Finished difference Result 151 states and 153 transitions. [2021-05-06 06:15:47,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 06:15:47,566 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 147 [2021-05-06 06:15:47,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:15:47,567 INFO L225 Difference]: With dead ends: 151 [2021-05-06 06:15:47,567 INFO L226 Difference]: Without dead ends: 151 [2021-05-06 06:15:47,567 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 4895.3ms TimeCoverageRelationStatistics Valid=461, Invalid=15289, Unknown=0, NotChecked=0, Total=15750 [2021-05-06 06:15:47,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-06 06:15:47,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-05-06 06:15:47,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:15:47,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-06 06:15:47,569 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 147 [2021-05-06 06:15:47,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:15:47,570 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-06 06:15:47,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:15:47,570 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-06 06:15:47,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-06 06:15:47,570 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:15:47,571 INFO L523 BasicCegarLoop]: trace histogram [69, 53, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:15:47,776 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-06 06:15:47,777 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:15:47,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:15:47,777 INFO L82 PathProgramCache]: Analyzing trace with hash 317250028, now seen corresponding path program 51 times [2021-05-06 06:15:47,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:15:47,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933612945] [2021-05-06 06:15:47,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:15:47,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:15:49,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:15:49,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:15:49,278 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1674 proven. 2862 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-06 06:15:49,278 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:15:49,278 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933612945] [2021-05-06 06:15:49,278 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933612945] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:15:49,278 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365721823] [2021-05-06 06:15:49,278 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:15:49,948 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-05-06 06:15:49,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:15:49,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-06 06:15:49,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:15:52,744 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1749 proven. 256 refuted. 0 times theorem prover too weak. 2756 trivial. 0 not checked. [2021-05-06 06:15:52,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365721823] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:15:52,744 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:15:52,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 19] total 74 [2021-05-06 06:15:52,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169720014] [2021-05-06 06:15:52,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-06 06:15:52,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:15:52,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-06 06:15:52,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=520, Invalid=4882, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 06:15:52,746 INFO L87 Difference]: Start difference. First operand 151 states and 153 transitions. Second operand has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:15:58,746 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-06 06:16:00,761 WARN L205 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-06 06:16:03,099 WARN L205 SmtUtils]: Spent 411.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:16:06,252 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-06 06:16:10,288 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-06 06:16:14,322 WARN L205 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-06 06:16:20,496 WARN L205 SmtUtils]: Spent 584.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-06 06:16:27,214 WARN L205 SmtUtils]: Spent 599.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-06 06:16:33,636 WARN L205 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-06 06:16:41,079 WARN L205 SmtUtils]: Spent 473.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-06 06:16:45,713 WARN L205 SmtUtils]: Spent 454.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-06 06:16:48,108 WARN L205 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-06 06:16:50,060 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-06 06:16:50,735 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-06 06:16:51,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:16:51,435 INFO L93 Difference]: Finished difference Result 157 states and 160 transitions. [2021-05-06 06:16:51,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-06 06:16:51,436 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2021-05-06 06:16:51,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:16:51,436 INFO L225 Difference]: With dead ends: 157 [2021-05-06 06:16:51,436 INFO L226 Difference]: Without dead ends: 157 [2021-05-06 06:16:51,437 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 144 SyntacticMatches, 7 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2712 ImplicationChecksByTransitivity, 59310.1ms TimeCoverageRelationStatistics Valid=1427, Invalid=19743, Unknown=0, NotChecked=0, Total=21170 [2021-05-06 06:16:51,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-06 06:16:51,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 155. [2021-05-06 06:16:51,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.02) internal successors, (153), 150 states have internal predecessors, (153), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:16:51,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2021-05-06 06:16:51,438 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 149 [2021-05-06 06:16:51,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:16:51,439 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2021-05-06 06:16:51,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:16:51,439 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2021-05-06 06:16:51,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-06 06:16:51,439 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:16:51,439 INFO L523 BasicCegarLoop]: trace histogram [71, 54, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:16:51,640 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-06 06:16:51,640 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:16:51,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:16:51,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1555546951, now seen corresponding path program 52 times [2021-05-06 06:16:51,640 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:16:51,640 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338310155] [2021-05-06 06:16:51,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:16:51,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:16:53,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:16:53,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:16:53,226 INFO L134 CoverageAnalysis]: Checked inductivity of 5041 backedges. 1815 proven. 2970 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-06 06:16:53,226 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:16:53,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338310155] [2021-05-06 06:16:53,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338310155] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:16:53,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435645841] [2021-05-06 06:16:53,226 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:16:53,321 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 06:16:53,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:16:53,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 112 conjunts are in the unsatisfiable core [2021-05-06 06:16:53,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:16:53,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:16:53,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:16:53,668 INFO L134 CoverageAnalysis]: Checked inductivity of 5041 backedges. 1815 proven. 2970 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-06 06:16:53,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435645841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:16:53,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:16:53,669 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57] total 59 [2021-05-06 06:16:53,669 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974131847] [2021-05-06 06:16:53,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 06:16:53,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:16:53,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 06:16:53,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3252, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 06:16:53,670 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:16:58,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:16:58,472 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2021-05-06 06:16:58,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-06 06:16:58,473 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 153 [2021-05-06 06:16:58,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:16:58,473 INFO L225 Difference]: With dead ends: 157 [2021-05-06 06:16:58,473 INFO L226 Difference]: Without dead ends: 157 [2021-05-06 06:16:58,474 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1490 ImplicationChecksByTransitivity, 3969.1ms TimeCoverageRelationStatistics Valid=445, Invalid=12437, Unknown=0, NotChecked=0, Total=12882 [2021-05-06 06:16:58,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-06 06:16:58,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2021-05-06 06:16:58,475 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) [2021-05-06 06:16:58,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-06 06:16:58,475 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 153 [2021-05-06 06:16:58,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:16:58,475 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-06 06:16:58,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:16:58,476 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-06 06:16:58,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-06 06:16:58,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:16:58,476 INFO L523 BasicCegarLoop]: trace histogram [72, 55, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:16:58,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:16:58,677 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:16:58,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:16:58,677 INFO L82 PathProgramCache]: Analyzing trace with hash -290508187, now seen corresponding path program 53 times [2021-05-06 06:16:58,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:16:58,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474802857] [2021-05-06 06:16:58,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:16:58,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:17:00,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:17:00,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:17:00,297 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 1848 proven. 3080 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-06 06:17:00,297 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:17:00,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474802857] [2021-05-06 06:17:00,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [474802857] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:17:00,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47156875] [2021-05-06 06:17:00,298 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:20:13,116 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 73 check-sat command(s) [2021-05-06 06:20:13,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:20:13,150 WARN L261 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 215 conjunts are in the unsatisfiable core [2021-05-06 06:20:13,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:20:15,259 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 1848 proven. 3080 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-06 06:20:15,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47156875] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:20:15,259 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:20:15,259 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58] total 60 [2021-05-06 06:20:15,259 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989574198] [2021-05-06 06:20:15,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 06:20:15,260 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:20:15,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 06:20:15,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3367, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 06:20:15,260 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 60 states, 60 states have (on average 2.0833333333333335) internal successors, (125), 59 states have internal predecessors, (125), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:20:20,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:20:20,047 INFO L93 Difference]: Finished difference Result 159 states and 161 transitions. [2021-05-06 06:20:20,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 06:20:20,047 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.0833333333333335) internal successors, (125), 59 states have internal predecessors, (125), 2 states have call successors, (4), 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 [2021-05-06 06:20:20,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:20:20,048 INFO L225 Difference]: With dead ends: 159 [2021-05-06 06:20:20,048 INFO L226 Difference]: Without dead ends: 159 [2021-05-06 06:20:20,048 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 100 SyntacticMatches, 57 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1653 ImplicationChecksByTransitivity, 5808.4ms TimeCoverageRelationStatistics Valid=453, Invalid=12887, Unknown=0, NotChecked=0, Total=13340 [2021-05-06 06:20:20,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-06 06:20:20,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2021-05-06 06:20:20,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 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) [2021-05-06 06:20:20,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 161 transitions. [2021-05-06 06:20:20,050 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 161 transitions. Word has length 155 [2021-05-06 06:20:20,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:20:20,050 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 161 transitions. [2021-05-06 06:20:20,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 2.0833333333333335) internal successors, (125), 59 states have internal predecessors, (125), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:20:20,050 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 161 transitions. [2021-05-06 06:20:20,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-05-06 06:20:20,051 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:20:20,051 INFO L523 BasicCegarLoop]: trace histogram [73, 56, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:20:20,251 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-06 06:20:20,252 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:20:20,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:20:20,252 INFO L82 PathProgramCache]: Analyzing trace with hash -528002557, now seen corresponding path program 54 times [2021-05-06 06:20:20,252 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:20:20,252 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965612853] [2021-05-06 06:20:20,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:20:20,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:20:21,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:20:21,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:20:21,843 INFO L134 CoverageAnalysis]: Checked inductivity of 5329 backedges. 1881 proven. 3192 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-06 06:20:21,843 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:20:21,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965612853] [2021-05-06 06:20:21,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965612853] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:20:21,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719439272] [2021-05-06 06:20:21,844 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:21:15,730 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 71 check-sat command(s) [2021-05-06 06:21:15,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:21:15,743 WARN L261 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 217 conjunts are in the unsatisfiable core [2021-05-06 06:21:15,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:21:15,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:15,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:15,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:15,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:15,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:15,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:21,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:21,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:21,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:21,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:21,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:21,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:27,318 INFO L134 CoverageAnalysis]: Checked inductivity of 5329 backedges. 1749 proven. 3468 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 06:21:27,318 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719439272] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:21:27,318 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:21:27,319 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 64] total 108 [2021-05-06 06:21:27,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999540050] [2021-05-06 06:21:27,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 108 states [2021-05-06 06:21:27,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:21:27,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-05-06 06:21:27,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1974, Invalid=9582, Unknown=0, NotChecked=0, Total=11556 [2021-05-06 06:21:27,320 INFO L87 Difference]: Start difference. First operand 159 states and 161 transitions. Second operand has 108 states, 108 states have (on average 2.074074074074074) internal successors, (224), 107 states have internal predecessors, (224), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:21:42,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:21:42,177 INFO L93 Difference]: Finished difference Result 223 states and 255 transitions. [2021-05-06 06:21:42,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-05-06 06:21:42,177 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 2.074074074074074) internal successors, (224), 107 states have internal predecessors, (224), 2 states have call successors, (4), 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 157 [2021-05-06 06:21:42,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:21:42,178 INFO L225 Difference]: With dead ends: 223 [2021-05-06 06:21:42,178 INFO L226 Difference]: Without dead ends: 223 [2021-05-06 06:21:42,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 96 SyntacticMatches, 34 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9203 ImplicationChecksByTransitivity, 22033.9ms TimeCoverageRelationStatistics Valid=5947, Invalid=39209, Unknown=0, NotChecked=0, Total=45156 [2021-05-06 06:21:42,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-05-06 06:21:42,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 163. [2021-05-06 06:21:42,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.018987341772152) internal successors, (161), 158 states have internal predecessors, (161), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:21:42,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 165 transitions. [2021-05-06 06:21:42,182 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 165 transitions. Word has length 157 [2021-05-06 06:21:42,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:21:42,182 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 165 transitions. [2021-05-06 06:21:42,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 108 states, 108 states have (on average 2.074074074074074) internal successors, (224), 107 states have internal predecessors, (224), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:21:42,182 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 165 transitions. [2021-05-06 06:21:42,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-06 06:21:42,183 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:21:42,183 INFO L523 BasicCegarLoop]: trace histogram [75, 57, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:21:42,384 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:21:42,384 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:21:42,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:21:42,385 INFO L82 PathProgramCache]: Analyzing trace with hash 391582622, now seen corresponding path program 55 times [2021-05-06 06:21:42,385 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:21:42,385 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281518822] [2021-05-06 06:21:42,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:21:42,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:21:44,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:21:44,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:21:44,028 INFO L134 CoverageAnalysis]: Checked inductivity of 5625 backedges. 2030 proven. 3306 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-06 06:21:44,028 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:21:44,028 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281518822] [2021-05-06 06:21:44,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281518822] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:21:44,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952979131] [2021-05-06 06:21:44,029 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:21:44,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:21:44,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 118 conjunts are in the unsatisfiable core [2021-05-06 06:21:44,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:21:44,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:44,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:21:44,394 INFO L134 CoverageAnalysis]: Checked inductivity of 5625 backedges. 2030 proven. 3306 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-06 06:21:44,394 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [952979131] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:21:44,394 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:21:44,394 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60] total 62 [2021-05-06 06:21:44,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931043474] [2021-05-06 06:21:44,394 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 06:21:44,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:21:44,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 06:21:44,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=3603, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 06:21:44,395 INFO L87 Difference]: Start difference. First operand 163 states and 165 transitions. Second operand has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:21:49,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:21:49,507 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2021-05-06 06:21:49,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 06:21:49,507 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2021-05-06 06:21:49,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:21:49,508 INFO L225 Difference]: With dead ends: 165 [2021-05-06 06:21:49,508 INFO L226 Difference]: Without dead ends: 165 [2021-05-06 06:21:49,509 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1658 ImplicationChecksByTransitivity, 4176.8ms TimeCoverageRelationStatistics Valid=469, Invalid=13811, Unknown=0, NotChecked=0, Total=14280 [2021-05-06 06:21:49,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-05-06 06:21:49,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2021-05-06 06:21:49,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 160 states have (on average 1.01875) internal successors, (163), 160 states have internal predecessors, (163), 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) [2021-05-06 06:21:49,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2021-05-06 06:21:49,511 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 161 [2021-05-06 06:21:49,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:21:49,512 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2021-05-06 06:21:49,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:21:49,512 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2021-05-06 06:21:49,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-05-06 06:21:49,512 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:21:49,513 INFO L523 BasicCegarLoop]: trace histogram [76, 58, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:21:49,737 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-06 06:21:49,738 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:21:49,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:21:49,738 INFO L82 PathProgramCache]: Analyzing trace with hash -831224644, now seen corresponding path program 56 times [2021-05-06 06:21:49,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:21:49,738 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738033559] [2021-05-06 06:21:49,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:21:49,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:21:51,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:21:51,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:21:51,424 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 2065 proven. 3422 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-06 06:21:51,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:21:51,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738033559] [2021-05-06 06:21:51,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738033559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:21:51,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444570669] [2021-05-06 06:21:51,424 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 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:21:51,495 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:21:51,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:21:51,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 158 conjunts are in the unsatisfiable core [2021-05-06 06:21:51,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:21:52,801 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 0 proven. 5776 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:21:52,802 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444570669] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:21:52,802 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:21:52,802 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 79] total 81 [2021-05-06 06:21:52,802 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910862547] [2021-05-06 06:21:52,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-06 06:21:52,802 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:21:52,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-06 06:21:52,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=6262, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 06:21:52,803 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 81 states, 81 states have (on average 2.049382716049383) internal successors, (166), 80 states have internal predecessors, (166), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:21:59,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:21:59,368 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2021-05-06 06:21:59,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 06:21:59,369 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 2.049382716049383) internal successors, (166), 80 states have internal predecessors, (166), 2 states have call successors, (4), 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 163 [2021-05-06 06:21:59,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:21:59,369 INFO L225 Difference]: With dead ends: 167 [2021-05-06 06:21:59,369 INFO L226 Difference]: Without dead ends: 167 [2021-05-06 06:21:59,370 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1751 ImplicationChecksByTransitivity, 5755.2ms TimeCoverageRelationStatistics Valid=513, Invalid=18947, Unknown=0, NotChecked=0, Total=19460 [2021-05-06 06:21:59,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-06 06:21:59,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2021-05-06 06:21:59,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 162 states have (on average 1.0185185185185186) internal successors, (165), 162 states have internal predecessors, (165), 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) [2021-05-06 06:21:59,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2021-05-06 06:21:59,373 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 163 [2021-05-06 06:21:59,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:21:59,373 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2021-05-06 06:21:59,373 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 81 states have (on average 2.049382716049383) internal successors, (166), 80 states have internal predecessors, (166), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:21:59,373 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2021-05-06 06:21:59,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-05-06 06:21:59,374 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:21:59,374 INFO L523 BasicCegarLoop]: trace histogram [77, 59, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:21:59,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:21:59,585 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:21:59,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:21:59,585 INFO L82 PathProgramCache]: Analyzing trace with hash 872031834, now seen corresponding path program 57 times [2021-05-06 06:21:59,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:21:59,585 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768234525] [2021-05-06 06:21:59,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:21:59,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:22:01,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:22:01,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:22:01,333 INFO L134 CoverageAnalysis]: Checked inductivity of 5929 backedges. 2100 proven. 3540 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-06 06:22:01,333 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:22:01,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768234525] [2021-05-06 06:22:01,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1768234525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:22:01,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643339642] [2021-05-06 06:22:01,334 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:22:02,385 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2021-05-06 06:22:02,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:22:02,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-06 06:22:02,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:22:02,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:22:04,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5929 backedges. 2183 proven. 324 refuted. 0 times theorem prover too weak. 3422 trivial. 0 not checked. [2021-05-06 06:22:04,048 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643339642] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:22:04,048 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:22:04,048 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 21] total 82 [2021-05-06 06:22:04,048 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137884879] [2021-05-06 06:22:04,048 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-06 06:22:04,048 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:22:04,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-06 06:22:04,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=908, Invalid=5734, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 06:22:04,049 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 82 states, 82 states have (on average 2.0853658536585367) internal successors, (171), 81 states have internal predecessors, (171), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:22:10,681 WARN L205 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 45 [2021-05-06 06:22:14,805 WARN L205 SmtUtils]: Spent 771.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 42 [2021-05-06 06:22:22,549 WARN L205 SmtUtils]: Spent 835.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 50