/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/loop-acceleration/phases_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:05:16,798 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:05:16,800 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:05:16,828 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 18:05:16,828 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 18:05:16,836 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 18:05:16,840 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 18:05:16,845 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 18:05:16,847 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 18:05:16,851 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 18:05:16,852 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 18:05:16,853 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 18:05:16,854 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:05:16,855 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:05:16,857 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:05:16,858 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:05:16,859 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:05:16,861 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:05:16,864 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:05:16,870 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:05:16,871 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:05:16,872 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:05:16,873 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:05:16,875 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:05:16,877 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:05:16,895 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:05:16,895 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:05:16,896 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:05:16,904 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:05:16,924 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:05:16,924 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:05:16,927 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:05:16,927 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:05:16,927 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:05:16,927 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:05:16,928 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:05:16,928 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:05:16,928 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:05:16,929 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:05:16,929 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:05:16,930 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:05:16,930 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:05:16,930 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:05:16,930 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:05:16,930 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:05:16,930 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:05:16,930 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:05:16,931 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:05:16,931 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:05:16,931 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:05:16,932 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:05:16,932 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:05:17,221 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:05:17,239 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:05:17,242 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:05:17,243 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:05:17,243 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:05:17,244 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_1-1.c [2021-05-02 18:05:17,299 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/56bdb57c0/4c836b4dd9234a9984ae540f49956a9d/FLAGd8b918a96 [2021-05-02 18:05:17,766 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:05:17,766 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-1.c [2021-05-02 18:05:17,771 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/56bdb57c0/4c836b4dd9234a9984ae540f49956a9d/FLAGd8b918a96 [2021-05-02 18:05:18,268 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/56bdb57c0/4c836b4dd9234a9984ae540f49956a9d [2021-05-02 18:05:18,270 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:05:18,272 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:05:18,281 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:05:18,281 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:05:18,284 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:05:18,285 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:05:18" (1/1) ... [2021-05-02 18:05:18,286 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ed9e9b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:05:18, skipping insertion in model container [2021-05-02 18:05:18,286 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:05:18" (1/1) ... [2021-05-02 18:05:18,292 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:05:18,303 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:05:18,406 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-1.c[322,335] [2021-05-02 18:05:18,422 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:05:18,428 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:05:18,438 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-1.c[322,335] [2021-05-02 18:05:18,440 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:05:18,451 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:05:18,451 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:05:18 WrapperNode [2021-05-02 18:05:18,452 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:05:18,453 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:05:18,453 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:05:18,453 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:05:18,461 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:05:18" (1/1) ... [2021-05-02 18:05:18,461 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:05:18" (1/1) ... [2021-05-02 18:05:18,466 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:05:18" (1/1) ... [2021-05-02 18:05:18,466 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:05:18" (1/1) ... [2021-05-02 18:05:18,480 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:05:18" (1/1) ... [2021-05-02 18:05:18,486 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:05:18" (1/1) ... [2021-05-02 18:05:18,487 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:05:18" (1/1) ... [2021-05-02 18:05:18,491 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:05:18,492 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:05:18,492 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:05:18,492 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:05:18,493 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:05:18" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:05:18,606 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:05:18,606 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:05:18,607 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:05:18,607 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:05:18,607 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:05:18,607 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:05:18,608 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:05:18,608 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:05:18,608 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:05:18,608 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:05:18,608 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:05:18,609 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:05:18,609 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:05:18,609 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:05:18,609 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:05:18,609 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:05:18,609 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:05:18,851 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:05:18,851 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:05:18,852 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:05:18 BoogieIcfgContainer [2021-05-02 18:05:18,852 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:05:18,853 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:05:18,853 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:05:18,854 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:05:18,856 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:05:18" (1/1) ... [2021-05-02 18:05:18,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:05:18 BasicIcfg [2021-05-02 18:05:18,873 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:05:18,889 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:05:18,889 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:05:18,892 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:05:18,892 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:05:18" (1/4) ... [2021-05-02 18:05:18,892 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@577d1b79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:05:18, skipping insertion in model container [2021-05-02 18:05:18,892 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:05:18" (2/4) ... [2021-05-02 18:05:18,893 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@577d1b79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:05:18, skipping insertion in model container [2021-05-02 18:05:18,893 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:05:18" (3/4) ... [2021-05-02 18:05:18,893 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@577d1b79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:05:18, skipping insertion in model container [2021-05-02 18:05:18,893 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:05:18" (4/4) ... [2021-05-02 18:05:18,894 INFO L111 eAbstractionObserver]: Analyzing ICFG phases_1-1.cJordan [2021-05-02 18:05:18,898 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:05:18,902 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:05:18,915 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:05:18,931 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:05:18,931 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:05:18,931 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:05:18,931 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:05:18,931 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:05:18,932 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:05:18,932 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:05:18,932 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:05:18,942 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 18:05:18,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:05:18,947 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:18,948 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:18,948 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:18,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:18,952 INFO L82 PathProgramCache]: Analyzing trace with hash -756157467, now seen corresponding path program 1 times [2021-05-02 18:05:18,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:18,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363521621] [2021-05-02 18:05:18,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:19,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:19,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:19,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:19,206 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:19,206 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:19,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363521621] [2021-05-02 18:05:19,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363521621] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:05:19,207 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:05:19,208 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:05:19,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443554168] [2021-05-02 18:05:19,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:05:19,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:19,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:05:19,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:05:19,229 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:19,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:19,280 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-05-02 18:05:19,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:05:19,282 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 18:05:19,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:19,288 INFO L225 Difference]: With dead ends: 19 [2021-05-02 18:05:19,288 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 18:05:19,290 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 65.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:05:19,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 18:05:19,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 18:05:19,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:19,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-02 18:05:19,315 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-02 18:05:19,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:19,315 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-02 18:05:19,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:19,315 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-02 18:05:19,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:05:19,317 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:19,317 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:19,317 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:05:19,317 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:19,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:19,318 INFO L82 PathProgramCache]: Analyzing trace with hash -755233946, now seen corresponding path program 1 times [2021-05-02 18:05:19,318 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:19,318 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [89632089] [2021-05-02 18:05:19,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:19,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:19,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:19,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:19,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:19,471 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:19,471 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [89632089] [2021-05-02 18:05:19,472 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [89632089] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:05:19,473 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:05:19,473 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:05:19,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571471015] [2021-05-02 18:05:19,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:05:19,475 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:19,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:05:19,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:05:19,477 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:19,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:19,603 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-05-02 18:05:19,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:05:19,604 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 18:05:19,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:19,605 INFO L225 Difference]: With dead ends: 15 [2021-05-02 18:05:19,605 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 18:05:19,606 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 85.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:05:19,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 18:05:19,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 18:05:19,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:19,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 18:05:19,608 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-02 18:05:19,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:19,609 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 18:05:19,609 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:19,609 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 18:05:19,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 18:05:19,609 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:19,610 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:19,610 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:05:19,610 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:19,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:19,610 INFO L82 PathProgramCache]: Analyzing trace with hash 980092676, now seen corresponding path program 1 times [2021-05-02 18:05:19,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:19,611 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033367400] [2021-05-02 18:05:19,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:19,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:19,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:19,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:19,747 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:19,747 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:19,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033367400] [2021-05-02 18:05:19,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033367400] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:19,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473018525] [2021-05-02 18:05:19,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:19,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:19,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:05:19,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:19,926 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:19,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473018525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:19,927 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:19,927 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 18:05:19,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795328374] [2021-05-02 18:05:19,928 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:05:19,928 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:19,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:05:19,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:05:19,929 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:20,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:20,094 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-05-02 18:05:20,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:05:20,096 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 18:05:20,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:20,097 INFO L225 Difference]: With dead ends: 17 [2021-05-02 18:05:20,097 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 18:05:20,098 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 190.6ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:05:20,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 18:05:20,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 18:05:20,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:20,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 18:05:20,106 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2021-05-02 18:05:20,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:20,106 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 18:05:20,106 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:20,106 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 18:05:20,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 18:05:20,107 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:20,107 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:20,320 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 18:05:20,321 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:20,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:20,322 INFO L82 PathProgramCache]: Analyzing trace with hash -2113301726, now seen corresponding path program 2 times [2021-05-02 18:05:20,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:20,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170624729] [2021-05-02 18:05:20,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:20,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:20,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:20,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:20,458 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:20,458 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:20,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170624729] [2021-05-02 18:05:20,458 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170624729] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:20,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635137141] [2021-05-02 18:05:20,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:20,546 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:05:20,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:20,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:05:20,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:20,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:20,632 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:20,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [635137141] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:20,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:20,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 18:05:20,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849042990] [2021-05-02 18:05:20,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:05:20,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:20,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:05:20,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:05:20,635 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:20,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:20,846 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-05-02 18:05:20,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:05:20,847 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 18:05:20,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:20,849 INFO L225 Difference]: With dead ends: 19 [2021-05-02 18:05:20,849 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 18:05:20,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 236.1ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:05:20,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 18:05:20,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 18:05:20,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:20,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 18:05:20,855 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-05-02 18:05:20,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:20,855 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 18:05:20,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:20,855 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 18:05:20,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:05:20,857 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:20,857 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:21,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:21,077 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:21,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:21,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1547014080, now seen corresponding path program 3 times [2021-05-02 18:05:21,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:21,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021844143] [2021-05-02 18:05:21,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:21,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:21,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:21,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:21,255 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:21,255 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:21,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2021844143] [2021-05-02 18:05:21,256 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2021844143] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:21,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981620771] [2021-05-02 18:05:21,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:21,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:05:21,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:21,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 18:05:21,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:21,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:21,406 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 18:05:21,406 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981620771] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:05:21,406 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:05:21,406 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2021-05-02 18:05:21,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476778078] [2021-05-02 18:05:21,407 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:05:21,407 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:21,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:05:21,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:05:21,408 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:21,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:21,420 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-05-02 18:05:21,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:05:21,421 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 18:05:21,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:21,422 INFO L225 Difference]: With dead ends: 21 [2021-05-02 18:05:21,422 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 18:05:21,422 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 99.9ms TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:05:21,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 18:05:21,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 18:05:21,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:21,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-05-02 18:05:21,425 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2021-05-02 18:05:21,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:21,425 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-05-02 18:05:21,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:21,425 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-05-02 18:05:21,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 18:05:21,425 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:21,426 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:21,647 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:21,647 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:21,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:21,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1560917373, now seen corresponding path program 1 times [2021-05-02 18:05:21,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:21,648 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514952466] [2021-05-02 18:05:21,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:21,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:21,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:21,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:21,773 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:21,773 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:21,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514952466] [2021-05-02 18:05:21,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514952466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:21,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088702433] [2021-05-02 18:05:21,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:21,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:21,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:05:21,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:21,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:21,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:21,933 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:21,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088702433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:21,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:21,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 18:05:21,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637090960] [2021-05-02 18:05:21,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:05:21,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:21,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:05:21,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:05:21,936 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:22,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:22,099 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-05-02 18:05:22,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:05:22,100 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 18:05:22,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:22,101 INFO L225 Difference]: With dead ends: 22 [2021-05-02 18:05:22,101 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 18:05:22,101 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 178.6ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:05:22,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 18:05:22,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 18:05:22,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:22,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 18:05:22,109 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2021-05-02 18:05:22,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:22,109 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 18:05:22,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:22,109 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 18:05:22,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 18:05:22,110 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:22,110 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:22,332 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:22,332 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:22,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:22,333 INFO L82 PathProgramCache]: Analyzing trace with hash 294269723, now seen corresponding path program 2 times [2021-05-02 18:05:22,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:22,333 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505013414] [2021-05-02 18:05:22,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:22,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:22,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:22,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:22,431 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:22,431 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:22,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505013414] [2021-05-02 18:05:22,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505013414] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:22,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79945305] [2021-05-02 18:05:22,431 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:22,483 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:05:22,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:22,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 18:05:22,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:22,565 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:22,574 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:22,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [79945305] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:22,575 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:22,575 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-05-02 18:05:22,575 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466219276] [2021-05-02 18:05:22,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 18:05:22,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:22,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 18:05:22,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:05:22,576 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:22,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:22,786 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-02 18:05:22,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:05:22,787 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 18:05:22,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:22,787 INFO L225 Difference]: With dead ends: 24 [2021-05-02 18:05:22,787 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 18:05:22,788 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 198.9ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:05:22,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 18:05:22,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 18:05:22,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:22,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 18:05:22,790 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2021-05-02 18:05:22,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:22,791 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 18:05:22,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:22,791 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 18:05:22,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:05:22,792 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:22,792 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:23,015 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 18:05:23,015 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:23,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:23,015 INFO L82 PathProgramCache]: Analyzing trace with hash -1478377159, now seen corresponding path program 3 times [2021-05-02 18:05:23,016 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:23,016 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653260829] [2021-05-02 18:05:23,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:23,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:23,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:23,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:23,142 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:23,142 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:23,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653260829] [2021-05-02 18:05:23,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653260829] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:23,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684569939] [2021-05-02 18:05:23,143 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:23,240 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 18:05:23,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:23,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 18:05:23,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:23,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:23,313 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 18:05:23,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [684569939] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:23,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:23,314 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4] total 11 [2021-05-02 18:05:23,314 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831484066] [2021-05-02 18:05:23,314 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:05:23,314 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:23,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:05:23,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:05:23,315 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:23,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:23,683 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 18:05:23,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:05:23,684 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 18:05:23,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:23,685 INFO L225 Difference]: With dead ends: 31 [2021-05-02 18:05:23,685 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 18:05:23,685 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 360.6ms TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:05:23,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 18:05:23,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-02 18:05:23,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:23,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-02 18:05:23,692 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-05-02 18:05:23,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:23,693 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-02 18:05:23,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:23,693 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-02 18:05:23,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 18:05:23,694 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:23,694 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:23,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:23,897 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:23,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:23,897 INFO L82 PathProgramCache]: Analyzing trace with hash -738804780, now seen corresponding path program 4 times [2021-05-02 18:05:23,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:23,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931927209] [2021-05-02 18:05:23,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:23,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:24,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:24,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:24,030 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:05:24,030 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:24,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931927209] [2021-05-02 18:05:24,030 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931927209] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:24,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379243064] [2021-05-02 18:05:24,031 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:24,072 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:05:24,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:24,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 18:05:24,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:24,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:24,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:24,188 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:05:24,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [379243064] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:24,188 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:24,188 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 18:05:24,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365312687] [2021-05-02 18:05:24,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:05:24,189 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:24,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:05:24,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:05:24,190 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:24,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:24,442 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-05-02 18:05:24,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:05:24,443 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 18:05:24,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:24,443 INFO L225 Difference]: With dead ends: 30 [2021-05-02 18:05:24,443 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 18:05:24,444 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 250.3ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:05:24,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 18:05:24,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 18:05:24,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:24,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-02 18:05:24,447 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2021-05-02 18:05:24,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:24,447 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-02 18:05:24,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:24,447 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-02 18:05:24,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:05:24,448 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:24,448 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:24,671 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:24,671 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:24,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:24,672 INFO L82 PathProgramCache]: Analyzing trace with hash -186205326, now seen corresponding path program 5 times [2021-05-02 18:05:24,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:24,672 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557942896] [2021-05-02 18:05:24,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:24,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:24,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:24,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:24,979 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:05:24,979 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:24,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557942896] [2021-05-02 18:05:24,980 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557942896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:24,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533406666] [2021-05-02 18:05:24,980 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:25,042 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 18:05:25,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:25,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:05:25,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:25,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:25,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:25,160 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:05:25,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533406666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:25,161 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:25,161 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 18:05:25,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919334302] [2021-05-02 18:05:25,161 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:05:25,161 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:25,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:05:25,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:05:25,162 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:25,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:25,479 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-05-02 18:05:25,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:05:25,480 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 18:05:25,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:25,480 INFO L225 Difference]: With dead ends: 32 [2021-05-02 18:05:25,481 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 18:05:25,481 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 428.1ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:05:25,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 18:05:25,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 18:05:25,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:25,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-05-02 18:05:25,484 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2021-05-02 18:05:25,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:25,484 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-05-02 18:05:25,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:25,484 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-05-02 18:05:25,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 18:05:25,485 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:25,485 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:25,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:05:25,705 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:25,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:25,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1714074736, now seen corresponding path program 6 times [2021-05-02 18:05:25,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:25,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900827383] [2021-05-02 18:05:25,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:25,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:25,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:25,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:25,844 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:05:25,844 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:25,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900827383] [2021-05-02 18:05:25,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1900827383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:25,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284469770] [2021-05-02 18:05:25,845 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:25,951 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-05-02 18:05:25,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:25,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 18:05:25,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:26,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:26,061 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:26,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284469770] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:26,061 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:26,061 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 15 [2021-05-02 18:05:26,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470893294] [2021-05-02 18:05:26,062 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 18:05:26,062 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:26,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 18:05:26,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:05:26,063 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) [2021-05-02 18:05:26,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:26,466 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-05-02 18:05:26,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:05:26,466 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 [2021-05-02 18:05:26,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:26,467 INFO L225 Difference]: With dead ends: 34 [2021-05-02 18:05:26,467 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 18:05:26,467 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 384.2ms TimeCoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:05:26,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 18:05:26,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 18:05:26,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:26,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-05-02 18:05:26,470 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2021-05-02 18:05:26,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:26,470 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-05-02 18:05:26,470 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) [2021-05-02 18:05:26,470 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-05-02 18:05:26,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 18:05:26,471 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:26,471 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:26,675 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:26,676 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:26,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:26,676 INFO L82 PathProgramCache]: Analyzing trace with hash -1117762514, now seen corresponding path program 7 times [2021-05-02 18:05:26,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:26,676 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223384968] [2021-05-02 18:05:26,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:26,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:26,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:26,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:26,849 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:05:26,850 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:26,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223384968] [2021-05-02 18:05:26,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223384968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:26,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130718395] [2021-05-02 18:05:26,850 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:26,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:26,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:05:26,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:26,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:26,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:26,992 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:05:26,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [130718395] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:26,992 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:26,992 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 18:05:26,992 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541237950] [2021-05-02 18:05:26,993 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:05:26,993 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:26,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:05:26,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:05:26,994 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:27,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:27,446 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-05-02 18:05:27,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:05:27,446 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 18:05:27,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:27,447 INFO L225 Difference]: With dead ends: 36 [2021-05-02 18:05:27,447 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 18:05:27,448 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 425.4ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:05:27,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 18:05:27,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 18:05:27,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:27,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-05-02 18:05:27,450 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2021-05-02 18:05:27,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:27,451 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-05-02 18:05:27,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:27,451 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-05-02 18:05:27,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 18:05:27,452 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:27,452 INFO L523 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:27,665 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:27,665 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:27,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:27,665 INFO L82 PathProgramCache]: Analyzing trace with hash 707632460, now seen corresponding path program 8 times [2021-05-02 18:05:27,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:27,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483766625] [2021-05-02 18:05:27,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:27,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:27,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:27,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:27,844 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 33 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:05:27,845 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:27,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483766625] [2021-05-02 18:05:27,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [483766625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:27,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369159954] [2021-05-02 18:05:27,845 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:27,888 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:05:27,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:27,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 18:05:27,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:28,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:28,019 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:28,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [369159954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:28,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:28,020 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 17 [2021-05-02 18:05:28,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056137484] [2021-05-02 18:05:28,020 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:05:28,020 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:28,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:05:28,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:05:28,021 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:28,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:28,607 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2021-05-02 18:05:28,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 18:05:28,607 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 18:05:28,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:28,608 INFO L225 Difference]: With dead ends: 38 [2021-05-02 18:05:28,608 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 18:05:28,609 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 516.6ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:05:28,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 18:05:28,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 18:05:28,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:28,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-05-02 18:05:28,611 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2021-05-02 18:05:28,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:28,612 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-05-02 18:05:28,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:28,612 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-05-02 18:05:28,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 18:05:28,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:28,613 INFO L523 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:28,835 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 18:05:28,835 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:28,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:28,836 INFO L82 PathProgramCache]: Analyzing trace with hash -1729421590, now seen corresponding path program 9 times [2021-05-02 18:05:28,836 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:28,836 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025548216] [2021-05-02 18:05:28,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:28,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:29,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:29,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:29,041 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 18:05:29,041 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:29,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025548216] [2021-05-02 18:05:29,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025548216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:29,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345326541] [2021-05-02 18:05:29,042 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:29,117 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 18:05:29,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:29,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 18:05:29,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:29,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:29,343 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 4 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-05-02 18:05:29,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345326541] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:29,343 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:29,344 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5] total 18 [2021-05-02 18:05:29,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662891452] [2021-05-02 18:05:29,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:05:29,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:29,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:05:29,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:05:29,345 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:30,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:30,076 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2021-05-02 18:05:30,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 18:05:30,076 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 18:05:30,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:30,077 INFO L225 Difference]: With dead ends: 43 [2021-05-02 18:05:30,077 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 18:05:30,077 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 717.9ms TimeCoverageRelationStatistics Valid=157, Invalid=899, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:05:30,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 18:05:30,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 18:05:30,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:30,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-02 18:05:30,080 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 37 [2021-05-02 18:05:30,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:30,081 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-02 18:05:30,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:30,081 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-02 18:05:30,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 18:05:30,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:30,082 INFO L523 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:30,285 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:05:30,285 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:30,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:30,285 INFO L82 PathProgramCache]: Analyzing trace with hash 761242821, now seen corresponding path program 10 times [2021-05-02 18:05:30,286 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:30,286 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874416830] [2021-05-02 18:05:30,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:30,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:30,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:30,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:30,518 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:05:30,518 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:30,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874416830] [2021-05-02 18:05:30,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874416830] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:30,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471036851] [2021-05-02 18:05:30,519 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:30,566 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:05:30,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:30,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 18:05:30,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:30,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:30,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:30,685 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:05:30,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471036851] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:30,686 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:30,686 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 18:05:30,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146227952] [2021-05-02 18:05:30,687 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:05:30,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:30,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:05:30,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:05:30,688 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:31,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:31,298 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2021-05-02 18:05:31,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:05:31,299 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 18:05:31,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:31,302 INFO L225 Difference]: With dead ends: 45 [2021-05-02 18:05:31,302 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 18:05:31,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 568.9ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:05:31,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 18:05:31,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 18:05:31,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:31,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-02 18:05:31,316 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2021-05-02 18:05:31,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:31,316 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-02 18:05:31,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:31,317 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-02 18:05:31,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 18:05:31,317 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:31,317 INFO L523 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:31,518 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:05:31,518 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:31,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:31,518 INFO L82 PathProgramCache]: Analyzing trace with hash -2075068445, now seen corresponding path program 11 times [2021-05-02 18:05:31,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:31,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976757784] [2021-05-02 18:05:31,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:31,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:31,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:31,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:31,754 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:05:31,755 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:31,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976757784] [2021-05-02 18:05:31,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [976757784] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:31,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690630844] [2021-05-02 18:05:31,755 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:32,094 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 18:05:32,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:32,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 18:05:32,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:32,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:32,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:32,336 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:05:32,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690630844] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:32,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:32,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 18:05:32,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190188445] [2021-05-02 18:05:32,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:05:32,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:32,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:05:32,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:05:32,337 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:33,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:33,052 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2021-05-02 18:05:33,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 18:05:33,052 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 18:05:33,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:33,053 INFO L225 Difference]: With dead ends: 47 [2021-05-02 18:05:33,053 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 18:05:33,053 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 34 SyntacticMatches, 11 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 734.7ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:05:33,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 18:05:33,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-02 18:05:33,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:33,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2021-05-02 18:05:33,056 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2021-05-02 18:05:33,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:33,057 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2021-05-02 18:05:33,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:33,058 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2021-05-02 18:05:33,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 18:05:33,060 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:33,060 INFO L523 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:33,264 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:33,264 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:33,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:33,265 INFO L82 PathProgramCache]: Analyzing trace with hash -465962111, now seen corresponding path program 12 times [2021-05-02 18:05:33,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:33,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677396274] [2021-05-02 18:05:33,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:33,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:33,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:33,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:33,534 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 75 proven. 210 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:05:33,534 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:33,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677396274] [2021-05-02 18:05:33,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677396274] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:33,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785018151] [2021-05-02 18:05:33,534 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:33,839 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 18:05:33,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:33,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 18:05:33,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:33,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:33,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:34,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:34,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:34,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:34,400 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 138 proven. 59 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-05-02 18:05:34,400 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1785018151] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:34,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:34,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9] total 25 [2021-05-02 18:05:34,401 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225256606] [2021-05-02 18:05:34,401 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:05:34,401 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:34,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:05:34,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=487, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:05:34,402 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:35,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:35,779 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2021-05-02 18:05:35,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 18:05:35,779 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 18:05:35,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:35,781 INFO L225 Difference]: With dead ends: 57 [2021-05-02 18:05:35,781 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 18:05:35,782 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 1452.1ms TimeCoverageRelationStatistics Valid=337, Invalid=1825, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:05:35,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 18:05:35,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 51. [2021-05-02 18:05:35,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:35,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 18:05:35,785 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 45 [2021-05-02 18:05:35,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:35,785 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 18:05:35,785 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:35,786 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 18:05:35,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 18:05:35,786 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:35,786 INFO L523 BasicCegarLoop]: trace histogram [19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:35,994 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 18:05:35,995 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:35,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:35,995 INFO L82 PathProgramCache]: Analyzing trace with hash 1812216220, now seen corresponding path program 13 times [2021-05-02 18:05:35,995 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:35,995 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734485550] [2021-05-02 18:05:35,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:36,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:36,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:36,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:36,260 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:05:36,261 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:36,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734485550] [2021-05-02 18:05:36,261 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734485550] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:36,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137519107] [2021-05-02 18:05:36,261 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:36,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:36,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 18:05:36,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:36,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:36,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:36,450 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:05:36,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137519107] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:36,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:36,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 18:05:36,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64324262] [2021-05-02 18:05:36,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:05:36,451 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:36,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:05:36,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:05:36,451 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:37,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:37,154 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2021-05-02 18:05:37,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:05:37,154 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 18:05:37,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:37,155 INFO L225 Difference]: With dead ends: 53 [2021-05-02 18:05:37,155 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 18:05:37,155 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 675.4ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:05:37,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 18:05:37,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 18:05:37,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:37,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-05-02 18:05:37,158 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2021-05-02 18:05:37,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:37,158 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-05-02 18:05:37,158 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:37,158 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-05-02 18:05:37,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 18:05:37,159 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:37,159 INFO L523 BasicCegarLoop]: trace histogram [20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:37,365 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:05:37,366 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:37,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:37,368 INFO L82 PathProgramCache]: Analyzing trace with hash -772305222, now seen corresponding path program 14 times [2021-05-02 18:05:37,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:37,368 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191499387] [2021-05-02 18:05:37,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:37,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:37,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:37,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:37,837 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 119 proven. 272 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:05:37,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:37,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191499387] [2021-05-02 18:05:37,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191499387] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:37,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659921037] [2021-05-02 18:05:37,838 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:37,897 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:05:37,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:37,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 18:05:37,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:38,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:38,105 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:38,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659921037] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:38,105 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:38,105 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 25 [2021-05-02 18:05:38,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762688729] [2021-05-02 18:05:38,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:05:38,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:38,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:05:38,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=536, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:05:38,108 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:39,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:39,033 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-05-02 18:05:39,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 18:05:39,034 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 18:05:39,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:39,035 INFO L225 Difference]: With dead ends: 55 [2021-05-02 18:05:39,035 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 18:05:39,035 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 917.5ms TimeCoverageRelationStatistics Valid=149, Invalid=1573, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:05:39,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 18:05:39,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 18:05:39,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:39,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-02 18:05:39,043 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2021-05-02 18:05:39,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:39,043 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-02 18:05:39,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:39,043 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-02 18:05:39,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 18:05:39,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:39,044 INFO L523 BasicCegarLoop]: trace histogram [21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:39,256 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:39,257 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:39,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:39,257 INFO L82 PathProgramCache]: Analyzing trace with hash -2006313896, now seen corresponding path program 15 times [2021-05-02 18:05:39,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:39,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659716992] [2021-05-02 18:05:39,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:39,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:39,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:39,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:39,571 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 126 proven. 306 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:05:39,572 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:39,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659716992] [2021-05-02 18:05:39,572 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659716992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:39,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702279450] [2021-05-02 18:05:39,572 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:39,681 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 18:05:39,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:39,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:05:39,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:40,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:40,171 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 153 proven. 16 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-05-02 18:05:40,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [702279450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:40,171 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:40,171 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7] total 26 [2021-05-02 18:05:40,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856000725] [2021-05-02 18:05:40,172 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:05:40,172 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:40,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:05:40,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:05:40,173 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:41,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:41,517 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2021-05-02 18:05:41,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:05:41,517 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 18:05:41,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:41,518 INFO L225 Difference]: With dead ends: 59 [2021-05-02 18:05:41,518 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 18:05:41,518 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 1365.9ms TimeCoverageRelationStatistics Valid=241, Invalid=2111, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:05:41,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 18:05:41,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-05-02 18:05:41,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:41,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2021-05-02 18:05:41,521 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 53 [2021-05-02 18:05:41,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:41,521 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2021-05-02 18:05:41,521 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:41,521 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2021-05-02 18:05:41,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 18:05:41,522 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:41,523 INFO L523 BasicCegarLoop]: trace histogram [23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:41,725 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:41,725 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:41,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:41,725 INFO L82 PathProgramCache]: Analyzing trace with hash -695600461, now seen corresponding path program 16 times [2021-05-02 18:05:41,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:41,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627676115] [2021-05-02 18:05:41,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:41,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:42,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:42,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:42,042 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:05:42,042 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:42,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627676115] [2021-05-02 18:05:42,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1627676115] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:42,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124780332] [2021-05-02 18:05:42,042 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:42,106 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:05:42,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:42,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 18:05:42,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:42,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:42,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:42,264 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:05:42,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124780332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:42,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:42,265 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 18:05:42,265 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731163907] [2021-05-02 18:05:42,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 18:05:42,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:42,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 18:05:42,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:05:42,269 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:43,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:43,182 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2021-05-02 18:05:43,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 18:05:43,186 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 18:05:43,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:43,187 INFO L225 Difference]: With dead ends: 61 [2021-05-02 18:05:43,187 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 18:05:43,187 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 828.3ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:05:43,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 18:05:43,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-02 18:05:43,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:43,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 18:05:43,190 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2021-05-02 18:05:43,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:43,190 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 18:05:43,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:43,190 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 18:05:43,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 18:05:43,190 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:43,191 INFO L523 BasicCegarLoop]: trace histogram [24, 19, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:43,404 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:43,405 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:43,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:43,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1302507055, now seen corresponding path program 17 times [2021-05-02 18:05:43,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:43,406 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584014499] [2021-05-02 18:05:43,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:43,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:43,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:43,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:43,761 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:05:43,761 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:43,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584014499] [2021-05-02 18:05:43,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [584014499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:43,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697936062] [2021-05-02 18:05:43,762 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:45,202 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 18:05:45,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:45,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 18:05:45,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:45,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:45,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:45,508 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:05:45,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697936062] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:45,508 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:45,508 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 18:05:45,508 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54417524] [2021-05-02 18:05:45,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:05:45,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:45,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:05:45,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:05:45,510 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 23 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:46,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:46,408 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2021-05-02 18:05:46,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 18:05:46,408 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 23 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 18:05:46,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:46,409 INFO L225 Difference]: With dead ends: 63 [2021-05-02 18:05:46,409 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 18:05:46,410 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 48 SyntacticMatches, 13 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 1013.4ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:05:46,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 18:05:46,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-02 18:05:46,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:46,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-02 18:05:46,411 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2021-05-02 18:05:46,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:46,412 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-02 18:05:46,412 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 23 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:46,412 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-02 18:05:46,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 18:05:46,412 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:46,412 INFO L523 BasicCegarLoop]: trace histogram [25, 20, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:46,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 18:05:46,618 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:46,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:46,618 INFO L82 PathProgramCache]: Analyzing trace with hash -424191633, now seen corresponding path program 18 times [2021-05-02 18:05:46,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:46,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808728796] [2021-05-02 18:05:46,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:46,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:47,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:47,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:47,035 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 189 proven. 420 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 18:05:47,036 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:47,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808728796] [2021-05-02 18:05:47,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808728796] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:47,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029540309] [2021-05-02 18:05:47,036 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:47,732 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2021-05-02 18:05:47,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:47,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 18:05:47,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:47,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:47,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:47,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:47,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:47,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:47,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:48,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:48,453 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 244 proven. 73 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-05-02 18:05:48,453 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029540309] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:48,453 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:48,453 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 9] total 31 [2021-05-02 18:05:48,453 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77429861] [2021-05-02 18:05:48,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 18:05:48,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:48,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 18:05:48,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=813, Unknown=0, NotChecked=0, Total=930 [2021-05-02 18:05:48,455 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:50,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:50,357 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2021-05-02 18:05:50,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 18:05:50,358 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 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 61 [2021-05-02 18:05:50,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:50,358 INFO L225 Difference]: With dead ends: 69 [2021-05-02 18:05:50,358 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 18:05:50,359 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 58 SyntacticMatches, 4 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 1998.1ms TimeCoverageRelationStatistics Valid=347, Invalid=3075, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 18:05:50,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 18:05:50,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2021-05-02 18:05:50,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:50,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-02 18:05:50,361 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 61 [2021-05-02 18:05:50,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:50,361 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-02 18:05:50,361 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:50,361 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-02 18:05:50,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 18:05:50,362 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:50,362 INFO L523 BasicCegarLoop]: trace histogram [27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:50,566 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 18:05:50,567 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:50,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:50,567 INFO L82 PathProgramCache]: Analyzing trace with hash 821090314, now seen corresponding path program 19 times [2021-05-02 18:05:50,567 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:50,567 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1589645329] [2021-05-02 18:05:50,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:50,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:50,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:50,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:50,992 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:05:50,992 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:50,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1589645329] [2021-05-02 18:05:50,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1589645329] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:50,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411644662] [2021-05-02 18:05:50,992 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:51,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:51,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 18:05:51,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:51,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:51,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:51,245 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:05:51,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411644662] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:51,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:51,246 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 18:05:51,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077925157] [2021-05-02 18:05:51,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:05:51,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:51,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:05:51,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:05:51,247 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:52,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:52,362 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-05-02 18:05:52,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 18:05:52,363 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 18:05:52,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:52,363 INFO L225 Difference]: With dead ends: 69 [2021-05-02 18:05:52,363 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 18:05:52,363 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 1101.3ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 18:05:52,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 18:05:52,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-02 18:05:52,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:52,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-05-02 18:05:52,365 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2021-05-02 18:05:52,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:52,365 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-05-02 18:05:52,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:52,366 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-05-02 18:05:52,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 18:05:52,366 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:52,366 INFO L523 BasicCegarLoop]: trace histogram [28, 22, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:52,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:52,585 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:52,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:52,585 INFO L82 PathProgramCache]: Analyzing trace with hash 729952552, now seen corresponding path program 20 times [2021-05-02 18:05:52,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:52,585 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673911769] [2021-05-02 18:05:52,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:52,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:52,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:52,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:52,991 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 253 proven. 506 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:05:52,991 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:52,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673911769] [2021-05-02 18:05:52,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673911769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:52,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783982723] [2021-05-02 18:05:52,992 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:53,051 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:05:53,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:53,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 18:05:53,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:53,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:53,355 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:05:53,355 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783982723] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:53,355 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:53,355 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 31] total 33 [2021-05-02 18:05:53,355 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847101087] [2021-05-02 18:05:53,356 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 18:05:53,356 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:53,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 18:05:53,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=970, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 18:05:53,357 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:54,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:54,659 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2021-05-02 18:05:54,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 18:05:54,660 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-02 18:05:54,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:54,660 INFO L225 Difference]: With dead ends: 71 [2021-05-02 18:05:54,660 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 18:05:54,661 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1276.1ms TimeCoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:05:54,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 18:05:54,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 18:05:54,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:54,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-05-02 18:05:54,662 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2021-05-02 18:05:54,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:54,662 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-05-02 18:05:54,662 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:54,663 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-05-02 18:05:54,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 18:05:54,663 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:54,663 INFO L523 BasicCegarLoop]: trace histogram [29, 23, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:54,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 18:05:54,864 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:54,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:54,864 INFO L82 PathProgramCache]: Analyzing trace with hash -954090810, now seen corresponding path program 21 times [2021-05-02 18:05:54,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:54,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873585307] [2021-05-02 18:05:54,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:54,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:55,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:55,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:55,306 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 264 proven. 552 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 18:05:55,307 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:55,307 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873585307] [2021-05-02 18:05:55,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [873585307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:55,307 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9596900] [2021-05-02 18:05:55,307 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:55,522 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 18:05:55,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:55,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:05:55,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:55,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:55,958 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 299 proven. 36 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-05-02 18:05:55,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9596900] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:55,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:55,958 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 9] total 34 [2021-05-02 18:05:55,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430002336] [2021-05-02 18:05:55,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 18:05:55,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:55,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 18:05:55,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=944, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:05:55,959 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:58,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:05:58,902 INFO L93 Difference]: Finished difference Result 77 states and 80 transitions. [2021-05-02 18:05:58,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:05:58,902 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-02 18:05:58,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:05:58,903 INFO L225 Difference]: With dead ends: 77 [2021-05-02 18:05:58,903 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 18:05:58,904 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 3033.0ms TimeCoverageRelationStatistics Valid=505, Invalid=3785, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:05:58,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 18:05:58,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2021-05-02 18:05:58,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:58,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2021-05-02 18:05:58,905 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 69 [2021-05-02 18:05:58,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:05:58,905 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2021-05-02 18:05:58,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:05:58,906 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2021-05-02 18:05:58,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 18:05:58,906 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:05:58,906 INFO L523 BasicCegarLoop]: trace histogram [31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:05:59,109 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:59,110 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:05:59,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:05:59,110 INFO L82 PathProgramCache]: Analyzing trace with hash 83673505, now seen corresponding path program 22 times [2021-05-02 18:05:59,110 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:05:59,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988043176] [2021-05-02 18:05:59,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:05:59,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:59,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:05:59,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:05:59,621 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:05:59,621 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:05:59,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988043176] [2021-05-02 18:05:59,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988043176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:59,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1988647083] [2021-05-02 18:05:59,621 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:05:59,674 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:05:59,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:05:59,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 18:05:59,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:05:59,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:59,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:05:59,858 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:05:59,858 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1988647083] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:05:59,858 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:05:59,858 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 18:05:59,858 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317014679] [2021-05-02 18:05:59,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 18:05:59,859 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:05:59,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 18:05:59,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 18:05:59,860 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:01,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:01,181 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2021-05-02 18:06:01,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 18:06:01,182 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-02 18:06:01,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:01,182 INFO L225 Difference]: With dead ends: 77 [2021-05-02 18:06:01,182 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 18:06:01,183 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1251.9ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:06:01,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 18:06:01,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-02 18:06:01,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:01,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-05-02 18:06:01,185 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2021-05-02 18:06:01,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:01,185 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-05-02 18:06:01,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:01,185 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-05-02 18:06:01,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 18:06:01,185 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:01,186 INFO L523 BasicCegarLoop]: trace histogram [32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:01,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 18:06:01,393 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:01,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:01,393 INFO L82 PathProgramCache]: Analyzing trace with hash 153754815, now seen corresponding path program 23 times [2021-05-02 18:06:01,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:01,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803252646] [2021-05-02 18:06:01,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:01,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:01,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:01,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:01,898 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:06:01,898 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:01,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803252646] [2021-05-02 18:06:01,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803252646] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:01,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541426521] [2021-05-02 18:06:01,898 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:06:07,828 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2021-05-02 18:06:07,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:06:07,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 18:06:07,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:06:08,476 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:06:08,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541426521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:08,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:06:08,477 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 18:06:08,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821948401] [2021-05-02 18:06:08,477 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 18:06:08,477 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:08,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 18:06:08,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:06:08,478 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:09,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:09,881 INFO L93 Difference]: Finished difference Result 79 states and 81 transitions. [2021-05-02 18:06:09,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 18:06:09,882 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-02 18:06:09,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:09,882 INFO L225 Difference]: With dead ends: 79 [2021-05-02 18:06:09,882 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 18:06:09,883 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 48 SyntacticMatches, 29 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 1738.2ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:06:09,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 18:06:09,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-02 18:06:09,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:09,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-02 18:06:09,885 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2021-05-02 18:06:09,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:09,886 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-02 18:06:09,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:09,886 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-02 18:06:09,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 18:06:09,886 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:09,886 INFO L523 BasicCegarLoop]: trace histogram [33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:10,096 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:06:10,097 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:10,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:10,097 INFO L82 PathProgramCache]: Analyzing trace with hash -1217583011, now seen corresponding path program 24 times [2021-05-02 18:06:10,097 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:10,098 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614161433] [2021-05-02 18:06:10,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:10,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:10,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:10,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:10,646 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 351 proven. 702 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 18:06:10,646 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:10,646 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614161433] [2021-05-02 18:06:10,646 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614161433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:10,646 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449132590] [2021-05-02 18:06:10,647 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:06:12,281 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 18:06:12,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:06:12,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 18:06:12,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:06:12,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:12,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:12,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:12,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:12,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:12,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:13,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:13,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 442 proven. 177 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2021-05-02 18:06:13,028 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449132590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:13,028 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:06:13,028 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 11] total 39 [2021-05-02 18:06:13,028 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446338546] [2021-05-02 18:06:13,028 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 18:06:13,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:13,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 18:06:13,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1252, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 18:06:13,029 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:16,301 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:06:16,847 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:06:17,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:17,716 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2021-05-02 18:06:17,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 18:06:17,716 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 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 77 [2021-05-02 18:06:17,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:17,717 INFO L225 Difference]: With dead ends: 89 [2021-05-02 18:06:17,717 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 18:06:17,718 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 75 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 763 ImplicationChecksByTransitivity, 4823.6ms TimeCoverageRelationStatistics Valid=695, Invalid=5157, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 18:06:17,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 18:06:17,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 83. [2021-05-02 18:06:17,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:17,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-05-02 18:06:17,720 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 77 [2021-05-02 18:06:17,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:17,720 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-05-02 18:06:17,720 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:17,721 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-05-02 18:06:17,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 18:06:17,721 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:17,721 INFO L523 BasicCegarLoop]: trace histogram [35, 27, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:17,926 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:06:17,926 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:17,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:17,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1094035320, now seen corresponding path program 25 times [2021-05-02 18:06:17,927 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:17,927 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872755085] [2021-05-02 18:06:17,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:17,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:18,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:18,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:18,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:06:18,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:18,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872755085] [2021-05-02 18:06:18,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872755085] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:18,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012899871] [2021-05-02 18:06:18,546 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:06:18,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:18,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 18:06:18,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:06:18,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:18,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:18,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:06:18,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012899871] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:18,815 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:06:18,815 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 18:06:18,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429950772] [2021-05-02 18:06:18,816 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 18:06:18,816 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:18,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 18:06:18,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:06:18,817 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:20,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:20,475 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2021-05-02 18:06:20,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 18:06:20,476 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-02 18:06:20,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:20,476 INFO L225 Difference]: With dead ends: 85 [2021-05-02 18:06:20,476 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 18:06:20,477 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 1500.1ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 18:06:20,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 18:06:20,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-02 18:06:20,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:20,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-02 18:06:20,479 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2021-05-02 18:06:20,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:20,479 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-02 18:06:20,480 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:20,480 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-02 18:06:20,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 18:06:20,480 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:20,480 INFO L523 BasicCegarLoop]: trace histogram [36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:20,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:06:20,689 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:20,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:20,689 INFO L82 PathProgramCache]: Analyzing trace with hash 2078082198, now seen corresponding path program 26 times [2021-05-02 18:06:20,689 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:20,689 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311488080] [2021-05-02 18:06:20,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:20,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:21,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:21,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:21,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:06:21,257 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:21,257 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311488080] [2021-05-02 18:06:21,257 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311488080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:21,257 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988108582] [2021-05-02 18:06:21,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:06:21,435 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:06:21,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:06:21,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 75 conjunts are in the unsatisfiable core [2021-05-02 18:06:21,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:06:21,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:21,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:06:21,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [988108582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:21,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:06:21,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 39] total 41 [2021-05-02 18:06:21,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879040042] [2021-05-02 18:06:21,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 18:06:21,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:21,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 18:06:21,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1532, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:06:21,882 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:23,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:23,847 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2021-05-02 18:06:23,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 18:06:23,848 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-02 18:06:23,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:23,848 INFO L225 Difference]: With dead ends: 87 [2021-05-02 18:06:23,848 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 18:06:23,849 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 1820.9ms TimeCoverageRelationStatistics Valid=253, Invalid=4577, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:06:23,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 18:06:23,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-02 18:06:23,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:23,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-02 18:06:23,851 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2021-05-02 18:06:23,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:23,852 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-02 18:06:23,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:23,852 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-02 18:06:23,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 18:06:23,852 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:23,852 INFO L523 BasicCegarLoop]: trace histogram [37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:24,056 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 18:06:24,057 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:24,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:24,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1440640460, now seen corresponding path program 27 times [2021-05-02 18:06:24,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:24,057 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55736268] [2021-05-02 18:06:24,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:24,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:24,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:24,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:24,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 450 proven. 870 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:06:24,671 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:24,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55736268] [2021-05-02 18:06:24,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [55736268] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:24,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300475626] [2021-05-02 18:06:24,672 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:06:24,873 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 18:06:24,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:06:24,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:06:24,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:06:25,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:25,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 493 proven. 64 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-05-02 18:06:25,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300475626] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:25,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:06:25,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 11] total 42 [2021-05-02 18:06:25,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657109104] [2021-05-02 18:06:25,341 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 18:06:25,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:25,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 18:06:25,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1432, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:06:25,342 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:27,774 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:06:29,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:29,632 INFO L93 Difference]: Finished difference Result 93 states and 97 transitions. [2021-05-02 18:06:29,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:06:29,632 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-02 18:06:29,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:29,633 INFO L225 Difference]: With dead ends: 93 [2021-05-02 18:06:29,633 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 18:06:29,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 826 ImplicationChecksByTransitivity, 4289.9ms TimeCoverageRelationStatistics Valid=899, Invalid=5743, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 18:06:29,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 18:06:29,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2021-05-02 18:06:29,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.035294117647059) internal successors, (88), 85 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:29,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2021-05-02 18:06:29,635 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 85 [2021-05-02 18:06:29,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:29,636 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2021-05-02 18:06:29,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:29,636 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2021-05-02 18:06:29,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 18:06:29,636 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:29,636 INFO L523 BasicCegarLoop]: trace histogram [39, 30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:29,837 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:06:29,837 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:29,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:29,838 INFO L82 PathProgramCache]: Analyzing trace with hash 401045903, now seen corresponding path program 28 times [2021-05-02 18:06:29,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:29,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430251167] [2021-05-02 18:06:29,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:29,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:30,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:30,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:30,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:06:30,534 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:30,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430251167] [2021-05-02 18:06:30,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1430251167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:30,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152532090] [2021-05-02 18:06:30,534 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:06:30,590 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:06:30,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:06:30,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 18:06:30,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:06:30,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:30,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:06:30,809 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:06:30,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152532090] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:30,810 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:06:30,810 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 18:06:30,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817931074] [2021-05-02 18:06:30,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 18:06:30,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:30,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 18:06:30,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 18:06:30,812 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:32,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:32,712 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2021-05-02 18:06:32,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 18:06:32,712 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-02 18:06:32,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:32,713 INFO L225 Difference]: With dead ends: 92 [2021-05-02 18:06:32,713 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 18:06:32,713 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 470 ImplicationChecksByTransitivity, 1706.3ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:06:32,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 18:06:32,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-05-02 18:06:32,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.0344827586206897) internal successors, (90), 87 states have internal predecessors, (90), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:32,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2021-05-02 18:06:32,715 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 89 [2021-05-02 18:06:32,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:32,715 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2021-05-02 18:06:32,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:32,716 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2021-05-02 18:06:32,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 18:06:32,716 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:32,716 INFO L523 BasicCegarLoop]: trace histogram [40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:32,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 18:06:32,925 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:32,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:32,925 INFO L82 PathProgramCache]: Analyzing trace with hash -135866195, now seen corresponding path program 29 times [2021-05-02 18:06:32,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:32,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873764191] [2021-05-02 18:06:32,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:32,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:33,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:33,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:33,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 544 proven. 992 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:06:33,671 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:33,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873764191] [2021-05-02 18:06:33,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873764191] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:33,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [487142509] [2021-05-02 18:06:33,672 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:06:54,873 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 41 check-sat command(s) [2021-05-02 18:06:54,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:06:54,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 117 conjunts are in the unsatisfiable core [2021-05-02 18:06:54,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:06:55,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 544 proven. 992 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:06:55,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [487142509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:55,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:06:55,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 18:06:55,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612564705] [2021-05-02 18:06:55,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 18:06:55,719 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:55,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 18:06:55,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:06:55,720 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand has 36 states, 36 states have (on average 2.138888888888889) internal successors, (77), 35 states have internal predecessors, (77), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:57,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:57,742 INFO L93 Difference]: Finished difference Result 94 states and 96 transitions. [2021-05-02 18:06:57,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:06:57,743 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.138888888888889) internal successors, (77), 35 states have internal predecessors, (77), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-02 18:06:57,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:57,743 INFO L225 Difference]: With dead ends: 94 [2021-05-02 18:06:57,743 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 18:06:57,744 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 61 SyntacticMatches, 32 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 2442.2ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 18:06:57,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 18:06:57,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-05-02 18:06:57,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 89 states have internal predecessors, (92), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:57,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2021-05-02 18:06:57,746 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 91 [2021-05-02 18:06:57,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:57,746 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2021-05-02 18:06:57,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.138888888888889) internal successors, (77), 35 states have internal predecessors, (77), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:57,746 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2021-05-02 18:06:57,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 18:06:57,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:57,747 INFO L523 BasicCegarLoop]: trace histogram [41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:57,952 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 18:06:57,953 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:57,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:57,953 INFO L82 PathProgramCache]: Analyzing trace with hash -712316853, now seen corresponding path program 30 times [2021-05-02 18:06:57,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:57,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504224911] [2021-05-02 18:06:57,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:57,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:58,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:58,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:58,675 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:06:58,675 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:58,675 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504224911] [2021-05-02 18:06:58,675 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504224911] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:06:58,675 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090165693] [2021-05-02 18:06:58,675 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:07:00,486 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 39 check-sat command(s) [2021-05-02 18:07:00,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:07:00,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 18:07:00,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:07:00,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:00,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:00,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:00,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:00,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:00,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:01,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:01,747 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 648 proven. 161 refuted. 0 times theorem prover too weak. 872 trivial. 0 not checked. [2021-05-02 18:07:01,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090165693] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:01,747 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:07:01,747 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 13] total 47 [2021-05-02 18:07:01,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931033913] [2021-05-02 18:07:01,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 18:07:01,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:07:01,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 18:07:01,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1921, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:07:01,748 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:06,426 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:07:07,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:07:07,710 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2021-05-02 18:07:07,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:07:07,710 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 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 93 [2021-05-02 18:07:07,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:07:07,711 INFO L225 Difference]: With dead ends: 105 [2021-05-02 18:07:07,711 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 18:07:07,711 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 91 SyntacticMatches, 3 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1114 ImplicationChecksByTransitivity, 6130.4ms TimeCoverageRelationStatistics Valid=756, Invalid=7800, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 18:07:07,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 18:07:07,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 99. [2021-05-02 18:07:07,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:07,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2021-05-02 18:07:07,713 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 93 [2021-05-02 18:07:07,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:07:07,714 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2021-05-02 18:07:07,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:07,714 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2021-05-02 18:07:07,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 18:07:07,714 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:07:07,714 INFO L523 BasicCegarLoop]: trace histogram [43, 33, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:07:07,918 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 18:07:07,919 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:07:07,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:07:07,919 INFO L82 PathProgramCache]: Analyzing trace with hash 505554918, now seen corresponding path program 31 times [2021-05-02 18:07:07,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:07:07,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097566524] [2021-05-02 18:07:07,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:07:07,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:08,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:07:08,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:08,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:07:08,638 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:07:08,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097566524] [2021-05-02 18:07:08,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1097566524] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:08,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804565231] [2021-05-02 18:07:08,638 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:07:08,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:08,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 18:07:08,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:07:08,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:08,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:08,926 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:07:08,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804565231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:08,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:07:08,927 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 18:07:08,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393104499] [2021-05-02 18:07:08,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 18:07:08,927 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:07:08,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 18:07:08,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 18:07:08,928 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:11,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:07:11,251 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2021-05-02 18:07:11,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 18:07:11,252 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-02 18:07:11,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:07:11,252 INFO L225 Difference]: With dead ends: 101 [2021-05-02 18:07:11,252 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 18:07:11,253 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 1930.5ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 18:07:11,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 18:07:11,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-05-02 18:07:11,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:11,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-05-02 18:07:11,255 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2021-05-02 18:07:11,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:07:11,255 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-05-02 18:07:11,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:11,255 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-05-02 18:07:11,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 18:07:11,256 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:07:11,256 INFO L523 BasicCegarLoop]: trace histogram [44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:07:11,460 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 18:07:11,461 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:07:11,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:07:11,461 INFO L82 PathProgramCache]: Analyzing trace with hash 1415022852, now seen corresponding path program 32 times [2021-05-02 18:07:11,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:07:11,461 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985175600] [2021-05-02 18:07:11,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:07:11,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:12,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:07:12,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:12,281 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 665 proven. 1190 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:07:12,281 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:07:12,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985175600] [2021-05-02 18:07:12,281 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985175600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:12,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878205806] [2021-05-02 18:07:12,281 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:07:12,330 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:07:12,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:07:12,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 18:07:12,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:07:12,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:12,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:07:12,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878205806] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:12,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:07:12,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 47] total 49 [2021-05-02 18:07:12,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035584269] [2021-05-02 18:07:12,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 18:07:12,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:07:12,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 18:07:12,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2222, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:07:12,936 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:15,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:07:15,891 INFO L93 Difference]: Finished difference Result 103 states and 105 transitions. [2021-05-02 18:07:15,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 18:07:15,891 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2021-05-02 18:07:15,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:07:15,892 INFO L225 Difference]: With dead ends: 103 [2021-05-02 18:07:15,892 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 18:07:15,893 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 2609.4ms TimeCoverageRelationStatistics Valid=305, Invalid=6667, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:07:15,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 18:07:15,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-02 18:07:15,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:15,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 18:07:15,895 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2021-05-02 18:07:15,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:07:15,895 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 18:07:15,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:15,896 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 18:07:15,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 18:07:15,896 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:07:15,896 INFO L523 BasicCegarLoop]: trace histogram [45, 35, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:07:16,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 18:07:16,118 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:07:16,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:07:16,119 INFO L82 PathProgramCache]: Analyzing trace with hash -759620958, now seen corresponding path program 33 times [2021-05-02 18:07:16,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:07:16,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033821302] [2021-05-02 18:07:16,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:07:16,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:16,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:07:16,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:16,925 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 684 proven. 1260 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:07:16,925 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:07:16,925 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033821302] [2021-05-02 18:07:16,925 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033821302] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:16,925 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602446894] [2021-05-02 18:07:16,925 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:07:17,202 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 18:07:17,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:07:17,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 18:07:17,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:07:17,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:17,935 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 735 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-02 18:07:17,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602446894] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:17,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:07:17,936 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 13] total 50 [2021-05-02 18:07:17,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098433526] [2021-05-02 18:07:17,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:07:17,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:07:17,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:07:17,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=2068, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:07:17,938 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:21,295 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:07:22,610 WARN L205 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:07:23,920 WARN L205 SmtUtils]: Spent 324.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:07:25,114 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:07:25,916 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:07:26,655 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:07:28,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:07:28,321 INFO L93 Difference]: Finished difference Result 109 states and 112 transitions. [2021-05-02 18:07:28,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 18:07:28,321 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 18:07:28,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:07:28,322 INFO L225 Difference]: With dead ends: 109 [2021-05-02 18:07:28,322 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 18:07:28,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1205 ImplicationChecksByTransitivity, 10391.2ms TimeCoverageRelationStatistics Valid=1037, Invalid=8469, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 18:07:28,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 18:07:28,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2021-05-02 18:07:28,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:28,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2021-05-02 18:07:28,325 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 101 [2021-05-02 18:07:28,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:07:28,325 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2021-05-02 18:07:28,325 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:28,325 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2021-05-02 18:07:28,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 18:07:28,326 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:07:28,326 INFO L523 BasicCegarLoop]: trace histogram [47, 36, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:07:28,529 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 18:07:28,529 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:07:28,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:07:28,530 INFO L82 PathProgramCache]: Analyzing trace with hash -1430674819, now seen corresponding path program 34 times [2021-05-02 18:07:28,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:07:28,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061967523] [2021-05-02 18:07:28,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:07:28,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:29,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:07:29,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:29,558 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:07:29,559 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:07:29,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061967523] [2021-05-02 18:07:29,559 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061967523] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:29,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2112437466] [2021-05-02 18:07:29,559 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:07:29,617 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:07:29,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:07:29,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 18:07:29,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:07:29,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:29,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:29,866 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:07:29,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2112437466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:29,866 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:07:29,866 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 18:07:29,867 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643750760] [2021-05-02 18:07:29,867 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 18:07:29,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:07:29,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 18:07:29,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 18:07:29,867 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:32,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:07:32,513 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2021-05-02 18:07:32,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 18:07:32,514 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-05-02 18:07:32,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:07:32,514 INFO L225 Difference]: With dead ends: 109 [2021-05-02 18:07:32,514 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 18:07:32,515 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 2388.7ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 18:07:32,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 18:07:32,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-02 18:07:32,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:32,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-02 18:07:32,517 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2021-05-02 18:07:32,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:07:32,517 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-02 18:07:32,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:32,517 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-02 18:07:32,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 18:07:32,518 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:07:32,518 INFO L523 BasicCegarLoop]: trace histogram [48, 37, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:07:32,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 18:07:32,729 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:07:32,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:07:32,729 INFO L82 PathProgramCache]: Analyzing trace with hash 704841115, now seen corresponding path program 35 times [2021-05-02 18:07:32,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:07:32,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744480033] [2021-05-02 18:07:32,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:07:32,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:33,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:07:33,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:33,792 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:07:33,792 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:07:33,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744480033] [2021-05-02 18:07:33,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744480033] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:33,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101318189] [2021-05-02 18:07:33,793 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:07:50,809 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 49 check-sat command(s) [2021-05-02 18:07:50,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:07:50,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-02 18:07:50,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:07:51,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:51,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:07:51,176 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 680 proven. 1560 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 18:07:51,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [101318189] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:51,177 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:07:51,177 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42] total 44 [2021-05-02 18:07:51,177 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365853535] [2021-05-02 18:07:51,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 18:07:51,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:07:51,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 18:07:51,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1769, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:07:51,178 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:54,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:07:54,087 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-05-02 18:07:54,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 18:07:54,088 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 107 [2021-05-02 18:07:54,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:07:54,088 INFO L225 Difference]: With dead ends: 111 [2021-05-02 18:07:54,089 INFO L226 Difference]: Without dead ends: 111 [2021-05-02 18:07:54,089 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 104 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 2612.5ms TimeCoverageRelationStatistics Valid=313, Invalid=6329, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 18:07:54,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-02 18:07:54,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-02 18:07:54,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:54,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-02 18:07:54,091 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2021-05-02 18:07:54,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:07:54,091 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-02 18:07:54,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:07:54,091 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-02 18:07:54,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 18:07:54,092 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:07:54,092 INFO L523 BasicCegarLoop]: trace histogram [49, 38, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:07:54,296 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 18:07:54,297 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:07:54,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:07:54,297 INFO L82 PathProgramCache]: Analyzing trace with hash -58713799, now seen corresponding path program 36 times [2021-05-02 18:07:54,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:07:54,297 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657385958] [2021-05-02 18:07:54,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:07:54,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:55,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:07:55,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:07:55,406 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 819 proven. 1482 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:07:55,406 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:07:55,406 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657385958] [2021-05-02 18:07:55,407 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657385958] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:07:55,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552486467] [2021-05-02 18:07:55,407 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:06,138 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 47 check-sat command(s) [2021-05-02 18:08:06,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:08:06,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 18:08:06,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:08:06,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:06,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:06,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:06,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:07,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:07,713 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 874 proven. 121 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2021-05-02 18:08:07,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552486467] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:07,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:08:07,714 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 14] total 54 [2021-05-02 18:08:07,714 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93621448] [2021-05-02 18:08:07,714 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 18:08:07,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:07,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 18:08:07,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=2583, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:08:07,715 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:13,843 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:08:14,894 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:08:15,926 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:08:16,721 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:08:17,708 WARN L205 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:08:18,411 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:08:19,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:19,109 INFO L93 Difference]: Finished difference Result 117 states and 120 transitions. [2021-05-02 18:08:19,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 18:08:19,110 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-02 18:08:19,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:19,110 INFO L225 Difference]: With dead ends: 117 [2021-05-02 18:08:19,110 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 18:08:19,111 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 108 SyntacticMatches, 3 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1391 ImplicationChecksByTransitivity, 11002.8ms TimeCoverageRelationStatistics Valid=803, Invalid=10327, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 18:08:19,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 18:08:19,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2021-05-02 18:08:19,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:19,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-02 18:08:19,113 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 109 [2021-05-02 18:08:19,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:19,113 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-02 18:08:19,113 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:19,113 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-02 18:08:19,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 18:08:19,114 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:19,114 INFO L523 BasicCegarLoop]: trace histogram [51, 39, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:19,319 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:19,319 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:19,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:19,320 INFO L82 PathProgramCache]: Analyzing trace with hash 1967511892, now seen corresponding path program 37 times [2021-05-02 18:08:19,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:19,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460937760] [2021-05-02 18:08:19,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:19,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:20,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:20,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:20,337 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:08:20,338 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:20,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460937760] [2021-05-02 18:08:20,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460937760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:20,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088528582] [2021-05-02 18:08:20,338 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:20,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:20,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 18:08:20,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:08:20,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:20,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:20,684 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:08:20,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1088528582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:20,684 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:08:20,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 18:08:20,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912917950] [2021-05-02 18:08:20,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 18:08:20,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:20,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 18:08:20,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 18:08:20,686 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:23,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:23,813 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2021-05-02 18:08:23,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 18:08:23,814 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-02 18:08:23,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:23,814 INFO L225 Difference]: With dead ends: 117 [2021-05-02 18:08:23,814 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 18:08:23,815 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 785 ImplicationChecksByTransitivity, 2613.0ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 18:08:23,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 18:08:23,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-05-02 18:08:23,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:23,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-05-02 18:08:23,817 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 113 [2021-05-02 18:08:23,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:23,817 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-05-02 18:08:23,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:23,817 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-05-02 18:08:23,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-02 18:08:23,818 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:23,818 INFO L523 BasicCegarLoop]: trace histogram [52, 40, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:24,028 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:24,029 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:24,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:24,029 INFO L82 PathProgramCache]: Analyzing trace with hash 1921072754, now seen corresponding path program 38 times [2021-05-02 18:08:24,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:24,029 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577817097] [2021-05-02 18:08:24,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:24,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:25,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:25,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:25,080 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 943 proven. 1640 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:08:25,080 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:25,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577817097] [2021-05-02 18:08:25,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577817097] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:25,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1798828969] [2021-05-02 18:08:25,080 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:25,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:08:25,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:08:25,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 18:08:25,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:08:25,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:25,943 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:08:25,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1798828969] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:25,943 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:08:25,943 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 55] total 57 [2021-05-02 18:08:25,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368432575] [2021-05-02 18:08:25,944 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 18:08:25,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:25,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 18:08:25,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=3040, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 18:08:25,944 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:30,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:30,065 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2021-05-02 18:08:30,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 18:08:30,065 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-02 18:08:30,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:30,066 INFO L225 Difference]: With dead ends: 119 [2021-05-02 18:08:30,066 INFO L226 Difference]: Without dead ends: 119 [2021-05-02 18:08:30,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 3501.1ms TimeCoverageRelationStatistics Valid=357, Invalid=9149, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 18:08:30,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-02 18:08:30,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-05-02 18:08:30,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 114 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:30,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-05-02 18:08:30,069 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 115 [2021-05-02 18:08:30,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:30,069 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-05-02 18:08:30,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:30,070 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-05-02 18:08:30,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-02 18:08:30,070 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:30,070 INFO L523 BasicCegarLoop]: trace histogram [53, 41, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:30,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 18:08:30,281 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:30,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:30,281 INFO L82 PathProgramCache]: Analyzing trace with hash 242734096, now seen corresponding path program 39 times [2021-05-02 18:08:30,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:30,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279102794] [2021-05-02 18:08:30,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:30,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:31,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:31,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:31,402 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 966 proven. 1722 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 18:08:31,402 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:31,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279102794] [2021-05-02 18:08:31,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279102794] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:31,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235086341] [2021-05-02 18:08:31,402 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:31,809 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-05-02 18:08:31,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:08:31,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 18:08:31,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:08:32,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:32,726 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 1025 proven. 144 refuted. 0 times theorem prover too weak. 1640 trivial. 0 not checked. [2021-05-02 18:08:32,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235086341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:32,726 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:08:32,726 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15] total 58 [2021-05-02 18:08:32,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450955441] [2021-05-02 18:08:32,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 18:08:32,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:32,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 18:08:32,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=518, Invalid=2788, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 18:08:32,727 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:37,393 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 45 [2021-05-02 18:08:39,319 WARN L205 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:08:40,826 WARN L205 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:08:41,819 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:08:43,053 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:08:43,921 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:08:44,633 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:08:47,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:47,140 INFO L93 Difference]: Finished difference Result 125 states and 129 transitions. [2021-05-02 18:08:47,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 18:08:47,140 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 117 [2021-05-02 18:08:47,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:47,141 INFO L225 Difference]: With dead ends: 125 [2021-05-02 18:08:47,141 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 18:08:47,142 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1632 ImplicationChecksByTransitivity, 13973.7ms TimeCoverageRelationStatistics Valid=1595, Invalid=11287, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 18:08:47,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 18:08:47,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 122. [2021-05-02 18:08:47,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.0256410256410255) internal successors, (120), 117 states have internal predecessors, (120), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:47,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2021-05-02 18:08:47,144 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 117 [2021-05-02 18:08:47,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:47,144 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2021-05-02 18:08:47,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:47,145 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2021-05-02 18:08:47,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-02 18:08:47,145 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:47,145 INFO L523 BasicCegarLoop]: trace histogram [55, 42, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:47,350 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:47,350 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:47,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:47,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1965210731, now seen corresponding path program 40 times [2021-05-02 18:08:47,350 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:47,350 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650244379] [2021-05-02 18:08:47,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:47,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:48,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:48,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:48,547 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:08:48,548 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:48,548 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650244379] [2021-05-02 18:08:48,548 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [650244379] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:48,548 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193957390] [2021-05-02 18:08:48,548 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:48,603 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:08:48,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:08:48,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 18:08:48,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:08:48,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:48,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:08:48,908 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:08:48,908 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193957390] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:48,908 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:08:48,908 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 18:08:48,908 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745524815] [2021-05-02 18:08:48,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 18:08:48,909 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:08:48,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 18:08:48,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:08:48,909 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:52,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:08:52,665 INFO L93 Difference]: Finished difference Result 124 states and 126 transitions. [2021-05-02 18:08:52,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:08:52,666 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 121 [2021-05-02 18:08:52,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:08:52,666 INFO L225 Difference]: With dead ends: 124 [2021-05-02 18:08:52,666 INFO L226 Difference]: Without dead ends: 124 [2021-05-02 18:08:52,667 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 3042.1ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 18:08:52,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-02 18:08:52,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2021-05-02 18:08:52,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0252100840336134) internal successors, (122), 119 states have internal predecessors, (122), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:52,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2021-05-02 18:08:52,669 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 121 [2021-05-02 18:08:52,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:08:52,670 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2021-05-02 18:08:52,670 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:08:52,670 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2021-05-02 18:08:52,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 18:08:52,670 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:08:52,670 INFO L523 BasicCegarLoop]: trace histogram [56, 43, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:08:52,884 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:08:52,885 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:08:52,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:08:52,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1731077001, now seen corresponding path program 41 times [2021-05-02 18:08:52,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:08:52,885 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938177416] [2021-05-02 18:08:52,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:08:52,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:54,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:08:54,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:08:54,103 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 1100 proven. 1892 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:08:54,103 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:08:54,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938177416] [2021-05-02 18:08:54,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1938177416] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:08:54,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894280726] [2021-05-02 18:08:54,103 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:10:43,901 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 57 check-sat command(s) [2021-05-02 18:10:43,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:10:43,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 104 conjunts are in the unsatisfiable core [2021-05-02 18:10:43,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:10:44,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:10:44,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:10:44,891 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 893 proven. 2162 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 18:10:44,891 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1894280726] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:10:44,892 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:10:44,892 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 49] total 51 [2021-05-02 18:10:44,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935232307] [2021-05-02 18:10:44,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 18:10:44,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:10:44,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 18:10:44,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2407, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 18:10:44,893 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:10:49,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:10:49,028 INFO L93 Difference]: Finished difference Result 126 states and 128 transitions. [2021-05-02 18:10:49,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 18:10:49,028 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 123 [2021-05-02 18:10:49,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:10:49,029 INFO L225 Difference]: With dead ends: 126 [2021-05-02 18:10:49,029 INFO L226 Difference]: Without dead ends: 126 [2021-05-02 18:10:49,030 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 113 SyntacticMatches, 9 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 972 ImplicationChecksByTransitivity, 3781.5ms TimeCoverageRelationStatistics Valid=363, Invalid=8567, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 18:10:49,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-02 18:10:49,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-05-02 18:10:49,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 121 states have (on average 1.024793388429752) internal successors, (124), 121 states have internal predecessors, (124), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:10:49,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 128 transitions. [2021-05-02 18:10:49,032 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 128 transitions. Word has length 123 [2021-05-02 18:10:49,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:10:49,032 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 128 transitions. [2021-05-02 18:10:49,032 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:10:49,032 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 128 transitions. [2021-05-02 18:10:49,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 18:10:49,033 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:10:49,033 INFO L523 BasicCegarLoop]: trace histogram [57, 44, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:10:49,242 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 18:10:49,243 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:10:49,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:10:49,243 INFO L82 PathProgramCache]: Analyzing trace with hash 66861863, now seen corresponding path program 42 times [2021-05-02 18:10:49,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:10:49,243 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715177254] [2021-05-02 18:10:49,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:10:49,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:10:50,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:10:50,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:10:50,525 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1125 proven. 1980 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 18:10:50,526 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:10:50,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715177254] [2021-05-02 18:10:50,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715177254] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:10:50,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775671135] [2021-05-02 18:10:50,526 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:04,479 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2021-05-02 18:11:04,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:11:04,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 18:11:04,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:11:04,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:04,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:04,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:04,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:04,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:04,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:07,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:07,197 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1244 proven. 281 refuted. 0 times theorem prover too weak. 1724 trivial. 0 not checked. [2021-05-02 18:11:07,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [775671135] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:07,197 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:11:07,197 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 17] total 63 [2021-05-02 18:11:07,197 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616935282] [2021-05-02 18:11:07,198 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 18:11:07,198 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:07,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 18:11:07,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=3573, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 18:11:07,199 INFO L87 Difference]: Start difference. First operand 126 states and 128 transitions. Second operand has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:14,153 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:11:20,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:20,813 INFO L93 Difference]: Finished difference Result 137 states and 142 transitions. [2021-05-02 18:11:20,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-02 18:11:20,813 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 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 125 [2021-05-02 18:11:20,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:20,814 INFO L225 Difference]: With dead ends: 137 [2021-05-02 18:11:20,814 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 18:11:20,815 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1998 ImplicationChecksByTransitivity, 13221.7ms TimeCoverageRelationStatistics Valid=1040, Invalid=14460, Unknown=0, NotChecked=0, Total=15500 [2021-05-02 18:11:20,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 18:11:20,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 131. [2021-05-02 18:11:20,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:20,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-05-02 18:11:20,817 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 125 [2021-05-02 18:11:20,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:20,817 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-05-02 18:11:20,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:20,817 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-05-02 18:11:20,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-02 18:11:20,818 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:20,818 INFO L523 BasicCegarLoop]: trace histogram [59, 45, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:21,024 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 18:11:21,024 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:21,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:21,024 INFO L82 PathProgramCache]: Analyzing trace with hash 7355330, now seen corresponding path program 43 times [2021-05-02 18:11:21,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:21,025 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135546759] [2021-05-02 18:11:21,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:21,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:22,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:22,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:22,536 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:11:22,536 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:22,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135546759] [2021-05-02 18:11:22,537 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135546759] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:22,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [296443152] [2021-05-02 18:11:22,537 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:22,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:22,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 18:11:22,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:11:22,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:22,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:22,953 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:11:22,954 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [296443152] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:22,954 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:11:22,954 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 18:11:22,954 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810620154] [2021-05-02 18:11:22,954 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:11:22,955 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:22,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:11:22,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:11:22,955 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:27,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:27,719 INFO L93 Difference]: Finished difference Result 133 states and 135 transitions. [2021-05-02 18:11:27,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:11:27,721 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 129 [2021-05-02 18:11:27,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:27,722 INFO L225 Difference]: With dead ends: 133 [2021-05-02 18:11:27,722 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 18:11:27,722 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 3822.1ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 18:11:27,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 18:11:27,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-05-02 18:11:27,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:27,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-02 18:11:27,725 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 129 [2021-05-02 18:11:27,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:27,725 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-02 18:11:27,725 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:27,725 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-02 18:11:27,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 18:11:27,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:27,726 INFO L523 BasicCegarLoop]: trace histogram [60, 46, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:27,940 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 18:11:27,941 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:27,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:27,941 INFO L82 PathProgramCache]: Analyzing trace with hash -1607883552, now seen corresponding path program 44 times [2021-05-02 18:11:27,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:27,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541139857] [2021-05-02 18:11:27,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:27,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:29,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:29,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:29,438 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 1269 proven. 2162 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:11:29,438 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:29,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541139857] [2021-05-02 18:11:29,438 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541139857] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:29,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235978384] [2021-05-02 18:11:29,438 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:29,499 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:11:29,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:11:29,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 123 conjunts are in the unsatisfiable core [2021-05-02 18:11:29,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:11:30,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:30,675 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:11:30,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235978384] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:30,676 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:11:30,676 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 63] total 65 [2021-05-02 18:11:30,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640151681] [2021-05-02 18:11:30,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 18:11:30,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:30,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 18:11:30,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=3986, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 18:11:30,677 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:36,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:36,902 INFO L93 Difference]: Finished difference Result 135 states and 137 transitions. [2021-05-02 18:11:36,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 18:11:36,903 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-02 18:11:36,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:36,904 INFO L225 Difference]: With dead ends: 135 [2021-05-02 18:11:36,904 INFO L226 Difference]: Without dead ends: 135 [2021-05-02 18:11:36,905 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 5034.0ms TimeCoverageRelationStatistics Valid=409, Invalid=12023, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 18:11:36,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-02 18:11:36,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-05-02 18:11:36,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:36,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-02 18:11:36,907 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 131 [2021-05-02 18:11:36,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:36,908 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-02 18:11:36,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:36,908 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-02 18:11:36,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-02 18:11:36,908 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:36,909 INFO L523 BasicCegarLoop]: trace histogram [61, 47, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:37,129 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:37,129 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:37,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:37,130 INFO L82 PathProgramCache]: Analyzing trace with hash 925711998, now seen corresponding path program 45 times [2021-05-02 18:11:37,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:37,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052547890] [2021-05-02 18:11:37,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:37,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:38,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:38,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:38,773 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1296 proven. 2256 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 18:11:38,773 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:38,773 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052547890] [2021-05-02 18:11:38,773 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052547890] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:38,773 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [901581100] [2021-05-02 18:11:38,773 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:11:39,509 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-05-02 18:11:39,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:11:39,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 18:11:39,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:11:39,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:39,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:39,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:11:44,286 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1218 proven. 781 refuted. 0 times theorem prover too weak. 1722 trivial. 0 not checked. [2021-05-02 18:11:44,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [901581100] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:44,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:11:44,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 22] total 66 [2021-05-02 18:11:44,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158752532] [2021-05-02 18:11:44,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 18:11:44,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:11:44,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 18:11:44,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=4068, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 18:11:44,287 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:57,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:11:57,900 INFO L93 Difference]: Finished difference Result 139 states and 141 transitions. [2021-05-02 18:11:57,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 18:11:57,901 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-02 18:11:57,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:11:57,902 INFO L225 Difference]: With dead ends: 139 [2021-05-02 18:11:57,902 INFO L226 Difference]: Without dead ends: 139 [2021-05-02 18:11:57,903 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 123 SyntacticMatches, 13 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2006 ImplicationChecksByTransitivity, 11417.5ms TimeCoverageRelationStatistics Valid=661, Invalid=15851, Unknown=0, NotChecked=0, Total=16512 [2021-05-02 18:11:57,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-02 18:11:57,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-05-02 18:11:57,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:57,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 18:11:57,905 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 133 [2021-05-02 18:11:57,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:11:57,905 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 18:11:57,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:11:57,906 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 18:11:57,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 18:11:57,906 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:11:57,906 INFO L523 BasicCegarLoop]: trace histogram [63, 48, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:11:58,110 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 18:11:58,111 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:11:58,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:11:58,111 INFO L82 PathProgramCache]: Analyzing trace with hash 722618201, now seen corresponding path program 46 times [2021-05-02 18:11:58,111 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:11:58,111 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736560470] [2021-05-02 18:11:58,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:11:58,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:59,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:11:59,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:11:59,973 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:11:59,973 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:11:59,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736560470] [2021-05-02 18:11:59,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [736560470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:11:59,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668679961] [2021-05-02 18:11:59,973 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:12:00,037 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:12:00,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:12:00,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-02 18:12:00,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:12:00,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:12:00,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:12:00,485 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:12:00,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668679961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:12:00,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:12:00,485 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 18:12:00,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373751504] [2021-05-02 18:12:00,486 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 18:12:00,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:12:00,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 18:12:00,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 18:12:00,486 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:12:06,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:12:06,525 INFO L93 Difference]: Finished difference Result 141 states and 143 transitions. [2021-05-02 18:12:06,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 18:12:06,526 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-02 18:12:06,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:12:06,527 INFO L225 Difference]: With dead ends: 141 [2021-05-02 18:12:06,527 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 18:12:06,527 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 4648.2ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 18:12:06,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 18:12:06,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-05-02 18:12:06,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:12:06,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-05-02 18:12:06,529 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 137 [2021-05-02 18:12:06,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:12:06,530 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-05-02 18:12:06,530 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:12:06,530 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-05-02 18:12:06,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-02 18:12:06,531 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:12:06,531 INFO L523 BasicCegarLoop]: trace histogram [64, 49, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:12:06,744 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:12:06,745 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:12:06,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:12:06,745 INFO L82 PathProgramCache]: Analyzing trace with hash 1935127159, now seen corresponding path program 47 times [2021-05-02 18:12:06,745 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:12:06,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047080881] [2021-05-02 18:12:06,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:12:06,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:12:08,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:12:08,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:12:08,630 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1450 proven. 2450 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:12:08,631 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:12:08,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047080881] [2021-05-02 18:12:08,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1047080881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:12:08,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182466080] [2021-05-02 18:12:08,631 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:12:55,576 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 65 check-sat command(s) [2021-05-02 18:12:55,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:12:55,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 116 conjunts are in the unsatisfiable core [2021-05-02 18:12:55,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:12:56,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:12:56,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:12:56,721 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 855 proven. 3192 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 18:12:56,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182466080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:12:56,721 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:12:56,721 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 59] total 61 [2021-05-02 18:12:56,721 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786807164] [2021-05-02 18:12:56,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 18:12:56,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:12:56,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 18:12:56,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=3491, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 18:12:56,722 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 61 states, 61 states have (on average 2.081967213114754) internal successors, (127), 60 states have internal predecessors, (127), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:13:04,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:13:04,373 INFO L93 Difference]: Finished difference Result 143 states and 145 transitions. [2021-05-02 18:13:04,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 18:13:04,374 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.081967213114754) internal successors, (127), 60 states have internal predecessors, (127), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 139 [2021-05-02 18:13:04,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:13:04,374 INFO L225 Difference]: With dead ends: 143 [2021-05-02 18:13:04,374 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 18:13:04,375 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1245 ImplicationChecksByTransitivity, 5801.2ms TimeCoverageRelationStatistics Valid=419, Invalid=11791, Unknown=0, NotChecked=0, Total=12210 [2021-05-02 18:13:04,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 18:13:04,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-05-02 18:13:04,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:13:04,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-02 18:13:04,377 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 139 [2021-05-02 18:13:04,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:13:04,377 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-02 18:13:04,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 2.081967213114754) internal successors, (127), 60 states have internal predecessors, (127), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:13:04,378 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-02 18:13:04,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 18:13:04,378 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:13:04,378 INFO L523 BasicCegarLoop]: trace histogram [65, 50, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:13:04,586 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:13:04,586 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:13:04,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:13:04,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1074868715, now seen corresponding path program 48 times [2021-05-02 18:13:04,587 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:13:04,587 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895395469] [2021-05-02 18:13:04,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:13:04,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:13:06,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:13:06,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:13:06,744 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1479 proven. 2550 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 18:13:06,744 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:13:06,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [895395469] [2021-05-02 18:13:06,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [895395469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:13:06,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063330308] [2021-05-02 18:13:06,745 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:13:36,481 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 63 check-sat command(s) [2021-05-02 18:13:36,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:13:36,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 18:13:36,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:13:36,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:13:36,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:13:36,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:13:36,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:13:38,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:13:38,805 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1550 proven. 225 refuted. 0 times theorem prover too weak. 2450 trivial. 0 not checked. [2021-05-02 18:13:38,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063330308] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:13:38,805 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:13:38,806 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 18] total 70 [2021-05-02 18:13:38,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107390566] [2021-05-02 18:13:38,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-02 18:13:38,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:13:38,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-02 18:13:38,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=691, Invalid=4139, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:13:38,807 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 70 states, 70 states have (on average 2.1) internal successors, (147), 69 states have internal predecessors, (147), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:13:47,968 WARN L205 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 45 [2021-05-02 18:13:51,136 WARN L205 SmtUtils]: Spent 490.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:13:55,390 WARN L205 SmtUtils]: Spent 689.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 42 [2021-05-02 18:14:02,629 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification. DAG size of input: 98 DAG size of output: 42 [2021-05-02 18:14:10,204 WARN L205 SmtUtils]: Spent 729.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 42 [2021-05-02 18:14:18,475 WARN L205 SmtUtils]: Spent 1.48 s on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:14:23,940 WARN L205 SmtUtils]: Spent 835.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:14:33,530 WARN L205 SmtUtils]: Spent 560.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:14:37,497 WARN L205 SmtUtils]: Spent 441.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:14:41,333 WARN L205 SmtUtils]: Spent 361.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:14:45,029 WARN L205 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:14:48,868 WARN L205 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:14:51,164 WARN L205 SmtUtils]: Spent 370.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:14:52,826 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:14:54,075 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 42 [2021-05-02 18:14:55,035 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2021-05-02 18:14:55,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:14:55,860 INFO L93 Difference]: Finished difference Result 149 states and 152 transitions. [2021-05-02 18:14:55,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 18:14:55,862 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.1) internal successors, (147), 69 states have internal predecessors, (147), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 141 [2021-05-02 18:14:55,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:14:55,863 INFO L225 Difference]: With dead ends: 149 [2021-05-02 18:14:55,863 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 18:14:55,864 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 141 SyntacticMatches, 2 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2484 ImplicationChecksByTransitivity, 76484.9ms TimeCoverageRelationStatistics Valid=1837, Invalid=17069, Unknown=0, NotChecked=0, Total=18906 [2021-05-02 18:14:55,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 18:14:55,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 147. [2021-05-02 18:14:55,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:14:55,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2021-05-02 18:14:55,867 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 141 [2021-05-02 18:14:55,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:14:55,867 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2021-05-02 18:14:55,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 2.1) internal successors, (147), 69 states have internal predecessors, (147), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:14:55,867 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2021-05-02 18:14:55,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-02 18:14:55,868 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:14:55,868 INFO L523 BasicCegarLoop]: trace histogram [67, 51, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:14:56,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 18:14:56,077 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:14:56,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:14:56,077 INFO L82 PathProgramCache]: Analyzing trace with hash 1706086192, now seen corresponding path program 49 times [2021-05-02 18:14:56,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:14:56,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347394130] [2021-05-02 18:14:56,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:14:56,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:14:59,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:14:59,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:14:59,488 INFO L134 CoverageAnalysis]: Checked inductivity of 4489 backedges. 1612 proven. 2652 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 18:14:59,488 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:14:59,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347394130] [2021-05-02 18:14:59,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347394130] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:14:59,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313583993] [2021-05-02 18:14:59,488 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:14:59,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:14:59,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 18:14:59,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:15:00,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:15:00,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:15:00,477 INFO L134 CoverageAnalysis]: Checked inductivity of 4489 backedges. 1612 proven. 2652 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 18:15:00,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313583993] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:15:00,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:15:00,477 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 18:15:00,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609361179] [2021-05-02 18:15:00,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 18:15:00,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:15:00,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 18:15:00,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 18:15:00,479 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:15:13,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:15:13,389 INFO L93 Difference]: Finished difference Result 149 states and 151 transitions. [2021-05-02 18:15:13,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 18:15:13,391 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 145 [2021-05-02 18:15:13,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:15:13,392 INFO L225 Difference]: With dead ends: 149 [2021-05-02 18:15:13,392 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 18:15:13,393 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 8629.9ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 18:15:13,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 18:15:13,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-05-02 18:15:13,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:15:13,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2021-05-02 18:15:13,396 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 145 [2021-05-02 18:15:13,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:15:13,396 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2021-05-02 18:15:13,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:15:13,396 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2021-05-02 18:15:13,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-02 18:15:13,396 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:15:13,397 INFO L523 BasicCegarLoop]: trace histogram [68, 52, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:15:13,597 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:15:13,598 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:15:13,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:15:13,598 INFO L82 PathProgramCache]: Analyzing trace with hash -1822409650, now seen corresponding path program 50 times [2021-05-02 18:15:13,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:15:13,599 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008174036] [2021-05-02 18:15:13,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:15:13,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:15:17,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:15:17,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:15:17,373 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 1643 proven. 2756 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 18:15:17,373 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:15:17,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008174036] [2021-05-02 18:15:17,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2008174036] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:15:17,374 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669262169] [2021-05-02 18:15:17,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:15:17,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:15:17,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:15:17,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 139 conjunts are in the unsatisfiable core [2021-05-02 18:15:17,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:15:20,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:15:20,564 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:15:20,564 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669262169] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:15:20,564 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:15:20,564 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 71] total 73 [2021-05-02 18:15:20,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125928319] [2021-05-02 18:15:20,565 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-02 18:15:20,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:15:20,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-02 18:15:20,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=5060, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 18:15:20,566 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:15:36,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:15:36,501 INFO L93 Difference]: Finished difference Result 151 states and 153 transitions. [2021-05-02 18:15:36,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 18:15:36,504 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 147 [2021-05-02 18:15:36,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:15:36,505 INFO L225 Difference]: With dead ends: 151 [2021-05-02 18:15:36,505 INFO L226 Difference]: Without dead ends: 151 [2021-05-02 18:15:36,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 11781.9ms TimeCoverageRelationStatistics Valid=461, Invalid=15289, Unknown=0, NotChecked=0, Total=15750 [2021-05-02 18:15:36,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-02 18:15:36,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-05-02 18:15:36,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:15:36,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-02 18:15:36,508 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 147 [2021-05-02 18:15:36,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:15:36,508 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-02 18:15:36,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:15:36,508 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-02 18:15:36,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-02 18:15:36,509 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:15:36,509 INFO L523 BasicCegarLoop]: trace histogram [69, 53, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:15:36,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 18:15:36,717 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:15:36,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:15:36,717 INFO L82 PathProgramCache]: Analyzing trace with hash 317250028, now seen corresponding path program 51 times [2021-05-02 18:15:36,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:15:36,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568884089] [2021-05-02 18:15:36,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:15:36,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:15:40,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:15:40,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:15:40,483 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1674 proven. 2862 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 18:15:40,483 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:15:40,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568884089] [2021-05-02 18:15:40,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568884089] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:15:40,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482735124] [2021-05-02 18:15:40,484 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:15:41,239 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-05-02 18:15:41,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:15:41,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 18:15:41,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:15:47,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:15:47,306 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1749 proven. 256 refuted. 0 times theorem prover too weak. 2756 trivial. 0 not checked. [2021-05-02 18:15:47,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482735124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:15:47,307 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:15:47,307 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 19] total 74 [2021-05-02 18:15:47,307 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586772102] [2021-05-02 18:15:47,307 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-02 18:15:47,307 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:15:47,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-02 18:15:47,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=520, Invalid=4882, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 18:15:47,308 INFO L87 Difference]: Start difference. First operand 151 states and 153 transitions. Second operand has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:16:05,089 WARN L205 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2021-05-02 18:16:06,560 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 18:16:08,604 WARN L205 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:16:11,605 WARN L205 SmtUtils]: Spent 403.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 18:16:15,295 WARN L205 SmtUtils]: Spent 525.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:16:21,449 WARN L205 SmtUtils]: Spent 1.07 s on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 18:16:29,151 WARN L205 SmtUtils]: Spent 739.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:16:37,167 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 18:16:47,828 WARN L205 SmtUtils]: Spent 719.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:16:57,743 WARN L205 SmtUtils]: Spent 1.49 s on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:17:09,241 WARN L205 SmtUtils]: Spent 1.48 s on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:17:22,613 WARN L205 SmtUtils]: Spent 2.08 s on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 18:17:32,709 WARN L205 SmtUtils]: Spent 1.22 s on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 18:17:38,793 WARN L205 SmtUtils]: Spent 933.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 18:17:43,723 WARN L205 SmtUtils]: Spent 476.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 18:17:46,312 WARN L205 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 18:17:47,733 WARN L205 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2021-05-02 18:17:49,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:17:49,212 INFO L93 Difference]: Finished difference Result 157 states and 160 transitions. [2021-05-02 18:17:49,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-02 18:17:49,215 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2021-05-02 18:17:49,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:17:49,216 INFO L225 Difference]: With dead ends: 157 [2021-05-02 18:17:49,216 INFO L226 Difference]: Without dead ends: 157 [2021-05-02 18:17:49,217 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 150 SyntacticMatches, 1 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2672 ImplicationChecksByTransitivity, 118179.4ms TimeCoverageRelationStatistics Valid=1427, Invalid=19743, Unknown=0, NotChecked=0, Total=21170 [2021-05-02 18:17:49,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-02 18:17:49,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 155. [2021-05-02 18:17:49,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.02) internal successors, (153), 150 states have internal predecessors, (153), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:17:49,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2021-05-02 18:17:49,219 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 149 [2021-05-02 18:17:49,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:17:49,219 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2021-05-02 18:17:49,219 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:17:49,219 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2021-05-02 18:17:49,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-02 18:17:49,220 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:17:49,220 INFO L523 BasicCegarLoop]: trace histogram [71, 54, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:17:49,420 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-02 18:17:49,420 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:17:49,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:17:49,421 INFO L82 PathProgramCache]: Analyzing trace with hash 1555546951, now seen corresponding path program 52 times [2021-05-02 18:17:49,421 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:17:49,421 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434523437] [2021-05-02 18:17:49,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:17:49,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:17:54,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:17:54,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:17:54,698 INFO L134 CoverageAnalysis]: Checked inductivity of 5041 backedges. 1815 proven. 2970 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:17:54,698 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:17:54,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434523437] [2021-05-02 18:17:54,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [434523437] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:17:54,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726451665] [2021-05-02 18:17:54,698 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:17:54,785 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:17:54,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:17:54,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 112 conjunts are in the unsatisfiable core [2021-05-02 18:17:54,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:17:56,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:17:56,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:17:56,428 INFO L134 CoverageAnalysis]: Checked inductivity of 5041 backedges. 1815 proven. 2970 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:17:56,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726451665] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:17:56,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:17:56,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57] total 59 [2021-05-02 18:17:56,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640677972] [2021-05-02 18:17:56,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 18:17:56,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:17:56,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 18:17:56,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3252, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 18:17:56,430 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:18:16,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:18:16,042 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2021-05-02 18:18:16,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 18:18:16,046 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 153 [2021-05-02 18:18:16,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:18:16,047 INFO L225 Difference]: With dead ends: 157 [2021-05-02 18:18:16,047 INFO L226 Difference]: Without dead ends: 157 [2021-05-02 18:18:16,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1490 ImplicationChecksByTransitivity, 12831.0ms TimeCoverageRelationStatistics Valid=445, Invalid=12437, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 18:18:16,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-02 18:18:16,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2021-05-02 18:18:16,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:18:16,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-02 18:18:16,049 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 153 [2021-05-02 18:18:16,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:18:16,050 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-02 18:18:16,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:18:16,050 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-02 18:18:16,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-02 18:18:16,050 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:18:16,050 INFO L523 BasicCegarLoop]: trace histogram [72, 55, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:18:16,251 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:18:16,251 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:18:16,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:18:16,251 INFO L82 PathProgramCache]: Analyzing trace with hash -290508187, now seen corresponding path program 53 times [2021-05-02 18:18:16,252 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:18:16,252 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399565640] [2021-05-02 18:18:16,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:18:16,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:18:21,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:18:21,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:18:21,606 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 1848 proven. 3080 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 18:18:21,607 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:18:21,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399565640] [2021-05-02 18:18:21,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399565640] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:18:21,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164601901] [2021-05-02 18:18:21,607 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