/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/nla-digbench-scaling/egcd2-ll_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 20:21:07,883 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 20:21:07,885 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 20:21:07,924 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 20:21:07,926 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 20:21:07,933 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 20:21:07,936 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 20:21:07,941 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 20:21:07,943 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 20:21:07,947 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 20:21:07,948 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 20:21:07,949 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 20:21:07,949 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 20:21:07,951 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 20:21:07,952 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 20:21:07,954 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 20:21:07,954 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 20:21:07,955 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 20:21:07,959 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 20:21:07,966 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 20:21:07,967 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 20:21:07,968 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 20:21:07,969 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 20:21:07,971 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 20:21:07,976 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 20:21:07,984 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 20:21:07,993 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 20:21:07,994 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 20:21:07,997 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 20:21:08,013 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 20:21:08,013 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 20:21:08,016 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 20:21:08,016 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 20:21:08,016 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 20:21:08,016 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 20:21:08,016 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 20:21:08,017 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 20:21:08,017 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 20:21:08,017 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 20:21:08,018 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 20:21:08,018 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 20:21:08,018 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 20:21:08,018 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 20:21:08,019 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 20:21:08,019 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 20:21:08,019 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 20:21:08,019 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 20:21:08,019 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 20:21:08,020 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 20:21:08,020 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 20:21:08,021 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 20:21:08,021 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 20:21:08,312 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 20:21:08,339 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 20:21:08,342 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 20:21:08,343 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 20:21:08,343 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 20:21:08,344 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/egcd2-ll_unwindbound20.c [2021-05-02 20:21:08,407 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c250dae7/896fc6f03e104d96bff7eab074aaa964/FLAG6a16b40ef [2021-05-02 20:21:08,848 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 20:21:08,849 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/egcd2-ll_unwindbound20.c [2021-05-02 20:21:08,854 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c250dae7/896fc6f03e104d96bff7eab074aaa964/FLAG6a16b40ef [2021-05-02 20:21:08,868 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c250dae7/896fc6f03e104d96bff7eab074aaa964 [2021-05-02 20:21:08,870 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 20:21:08,871 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 20:21:08,873 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 20:21:08,873 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 20:21:08,876 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 20:21:08,876 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:21:08" (1/1) ... [2021-05-02 20:21:08,877 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@615d4e5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:21:08, skipping insertion in model container [2021-05-02 20:21:08,877 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:21:08" (1/1) ... [2021-05-02 20:21:08,883 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 20:21:08,896 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 20:21:09,037 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/egcd2-ll_unwindbound20.c[490,503] [2021-05-02 20:21:09,070 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:21:09,077 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 20:21:09,121 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/egcd2-ll_unwindbound20.c[490,503] [2021-05-02 20:21:09,138 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:21:09,156 INFO L208 MainTranslator]: Completed translation [2021-05-02 20:21:09,156 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:21:09 WrapperNode [2021-05-02 20:21:09,157 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 20:21:09,158 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 20:21:09,158 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 20:21:09,158 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 20:21:09,168 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:21:09" (1/1) ... [2021-05-02 20:21:09,168 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:21:09" (1/1) ... [2021-05-02 20:21:09,181 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:21:09" (1/1) ... [2021-05-02 20:21:09,181 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:21:09" (1/1) ... [2021-05-02 20:21:09,192 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:21:09" (1/1) ... [2021-05-02 20:21:09,200 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:21:09" (1/1) ... [2021-05-02 20:21:09,205 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:21:09" (1/1) ... [2021-05-02 20:21:09,207 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 20:21:09,207 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 20:21:09,207 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 20:21:09,208 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 20:21:09,208 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:21:09" (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 20:21:09,280 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 20:21:09,281 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 20:21:09,281 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 20:21:09,281 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 20:21:09,281 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 20:21:09,281 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 20:21:09,281 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 20:21:09,282 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 20:21:09,282 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 20:21:09,282 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 20:21:09,282 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 20:21:09,283 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 20:21:09,283 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 20:21:09,283 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 20:21:09,283 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 20:21:09,283 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 20:21:09,284 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 20:21:09,284 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 20:21:09,284 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 20:21:09,284 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 20:21:09,527 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 20:21:09,527 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 20:21:09,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:21:09 BoogieIcfgContainer [2021-05-02 20:21:09,528 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 20:21:09,529 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 20:21:09,529 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 20:21:09,530 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 20:21:09,532 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:21:09" (1/1) ... [2021-05-02 20:21:09,546 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:21:09 BasicIcfg [2021-05-02 20:21:09,546 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 20:21:09,548 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 20:21:09,548 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 20:21:09,550 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 20:21:09,550 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 08:21:08" (1/4) ... [2021-05-02 20:21:09,550 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c633f8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:21:09, skipping insertion in model container [2021-05-02 20:21:09,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:21:09" (2/4) ... [2021-05-02 20:21:09,551 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c633f8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:21:09, skipping insertion in model container [2021-05-02 20:21:09,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:21:09" (3/4) ... [2021-05-02 20:21:09,551 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c633f8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 08:21:09, skipping insertion in model container [2021-05-02 20:21:09,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:21:09" (4/4) ... [2021-05-02 20:21:09,552 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd2-ll_unwindbound20.cJordan [2021-05-02 20:21:09,568 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 20:21:09,571 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 20:21:09,594 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 20:21:09,616 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 20:21:09,616 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 20:21:09,616 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 20:21:09,616 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 20:21:09,617 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 20:21:09,623 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 20:21:09,624 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 20:21:09,624 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 20:21:09,634 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 23 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 20:21:09,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 20:21:09,639 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:09,640 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:09,640 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:09,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:09,644 INFO L82 PathProgramCache]: Analyzing trace with hash -282167495, now seen corresponding path program 1 times [2021-05-02 20:21:09,651 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:09,651 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296253799] [2021-05-02 20:21:09,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:09,736 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:09,736 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [378029893] [2021-05-02 20:21:09,736 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 20:21:09,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:09,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 1 conjunts are in the unsatisfiable core [2021-05-02 20:21:09,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:09,937 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 20:21:09,938 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:09,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296253799] [2021-05-02 20:21:09,938 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:09,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378029893] [2021-05-02 20:21:09,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [378029893] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:21:09,939 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:21:09,939 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-05-02 20:21:09,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352393455] [2021-05-02 20:21:09,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-05-02 20:21:09,943 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:09,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-05-02 20:21:09,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-05-02 20:21:09,964 INFO L87 Difference]: Start difference. First operand has 39 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 23 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-05-02 20:21:09,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:09,976 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-05-02 20:21:09,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-05-02 20:21:09,977 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 32 [2021-05-02 20:21:09,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:09,983 INFO L225 Difference]: With dead ends: 39 [2021-05-02 20:21:09,983 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 20:21:09,984 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-05-02 20:21:09,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 20:21:10,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 20:21:10,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 20 states have internal predecessors, (23), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 20:21:10,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2021-05-02 20:21:10,014 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 32 [2021-05-02 20:21:10,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:10,016 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2021-05-02 20:21:10,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-05-02 20:21:10,017 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2021-05-02 20:21:10,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 20:21:10,018 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:10,019 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:10,240 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-05-02 20:21:10,241 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:10,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:10,241 INFO L82 PathProgramCache]: Analyzing trace with hash -127828113, now seen corresponding path program 1 times [2021-05-02 20:21:10,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:10,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241020226] [2021-05-02 20:21:10,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:10,262 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:10,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [527022712] [2021-05-02 20:21:10,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:10,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:10,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 20:21:10,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:10,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:10,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:10,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:10,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:10,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:10,508 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 20:21:10,508 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:10,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241020226] [2021-05-02 20:21:10,509 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:10,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527022712] [2021-05-02 20:21:10,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527022712] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:21:10,509 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:21:10,509 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 20:21:10,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986260924] [2021-05-02 20:21:10,510 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 20:21:10,510 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:10,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 20:21:10,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 20:21:10,511 INFO L87 Difference]: Start difference. First operand 34 states and 45 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 20:21:10,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:10,529 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2021-05-02 20:21:10,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 20:21:10,529 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 33 [2021-05-02 20:21:10,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:10,530 INFO L225 Difference]: With dead ends: 36 [2021-05-02 20:21:10,530 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 20:21:10,531 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.4ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 20:21:10,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 20:21:10,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 20:21:10,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 20:21:10,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2021-05-02 20:21:10,537 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 33 [2021-05-02 20:21:10,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:10,537 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2021-05-02 20:21:10,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 20:21:10,538 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2021-05-02 20:21:10,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 20:21:10,539 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:10,539 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:10,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:10,749 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:10,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:10,750 INFO L82 PathProgramCache]: Analyzing trace with hash 365419517, now seen corresponding path program 1 times [2021-05-02 20:21:10,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:10,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903001517] [2021-05-02 20:21:10,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:10,765 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:10,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [637990293] [2021-05-02 20:21:10,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:10,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:10,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:21:10,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:10,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:10,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:10,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:10,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:10,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:10,947 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 20:21:10,947 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:10,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903001517] [2021-05-02 20:21:10,947 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:10,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637990293] [2021-05-02 20:21:10,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637990293] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:10,948 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:10,948 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:21:10,948 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607114128] [2021-05-02 20:21:10,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:21:10,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:10,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:21:10,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:21:10,951 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 20:21:11,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:11,048 INFO L93 Difference]: Finished difference Result 45 states and 62 transitions. [2021-05-02 20:21:11,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:21:11,049 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2021-05-02 20:21:11,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:11,053 INFO L225 Difference]: With dead ends: 45 [2021-05-02 20:21:11,053 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 20:21:11,054 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 33.0ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:21:11,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 20:21:11,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 37. [2021-05-02 20:21:11,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 22 states have internal predecessors, (26), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 20:21:11,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 48 transitions. [2021-05-02 20:21:11,071 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 48 transitions. Word has length 34 [2021-05-02 20:21:11,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:11,071 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 48 transitions. [2021-05-02 20:21:11,071 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 20:21:11,072 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 48 transitions. [2021-05-02 20:21:11,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 20:21:11,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:11,075 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:11,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:11,277 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:11,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:11,277 INFO L82 PathProgramCache]: Analyzing trace with hash 196514290, now seen corresponding path program 1 times [2021-05-02 20:21:11,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:11,278 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97800389] [2021-05-02 20:21:11,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:11,306 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:11,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [345862684] [2021-05-02 20:21:11,307 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 20:21:11,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:11,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 20:21:11,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:11,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:11,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:11,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:11,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:11,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:11,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:11,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:11,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:11,589 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 20:21:11,591 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:11,591 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97800389] [2021-05-02 20:21:11,592 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:11,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345862684] [2021-05-02 20:21:11,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345862684] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:11,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:11,592 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 20:21:11,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936425381] [2021-05-02 20:21:11,593 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 20:21:11,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:11,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 20:21:11,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:21:11,595 INFO L87 Difference]: Start difference. First operand 37 states and 48 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 20:21:11,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:11,764 INFO L93 Difference]: Finished difference Result 57 states and 79 transitions. [2021-05-02 20:21:11,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 20:21:11,765 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2021-05-02 20:21:11,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:11,767 INFO L225 Difference]: With dead ends: 57 [2021-05-02 20:21:11,767 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 20:21:11,768 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 84.4ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:21:11,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 20:21:11,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2021-05-02 20:21:11,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 28 states have internal predecessors, (32), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 20:21:11,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 56 transitions. [2021-05-02 20:21:11,774 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 56 transitions. Word has length 36 [2021-05-02 20:21:11,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:11,774 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 56 transitions. [2021-05-02 20:21:11,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 20:21:11,775 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 56 transitions. [2021-05-02 20:21:11,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 20:21:11,775 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:11,775 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:11,992 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:11,992 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:11,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:11,993 INFO L82 PathProgramCache]: Analyzing trace with hash 56558454, now seen corresponding path program 1 times [2021-05-02 20:21:11,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:11,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215407668] [2021-05-02 20:21:11,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:12,009 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:12,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [153348397] [2021-05-02 20:21:12,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:12,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:12,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:21:12,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:12,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,185 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 20:21:12,185 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:12,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215407668] [2021-05-02 20:21:12,185 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:12,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153348397] [2021-05-02 20:21:12,185 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153348397] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:21:12,185 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:21:12,186 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 20:21:12,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89068864] [2021-05-02 20:21:12,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:21:12,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:12,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:21:12,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:21:12,187 INFO L87 Difference]: Start difference. First operand 44 states and 56 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 20:21:12,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:12,218 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2021-05-02 20:21:12,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 20:21:12,219 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 39 [2021-05-02 20:21:12,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:12,221 INFO L225 Difference]: With dead ends: 44 [2021-05-02 20:21:12,221 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 20:21:12,222 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 9.7ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:21:12,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 20:21:12,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 20:21:12,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 28 states have internal predecessors, (31), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 20:21:12,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 55 transitions. [2021-05-02 20:21:12,226 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 55 transitions. Word has length 39 [2021-05-02 20:21:12,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:12,226 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 55 transitions. [2021-05-02 20:21:12,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 20:21:12,226 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 55 transitions. [2021-05-02 20:21:12,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 20:21:12,227 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:12,227 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:12,443 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:12,443 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:12,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:12,444 INFO L82 PathProgramCache]: Analyzing trace with hash 578094295, now seen corresponding path program 1 times [2021-05-02 20:21:12,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:12,444 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736311444] [2021-05-02 20:21:12,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:12,453 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:12,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1424744615] [2021-05-02 20:21:12,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:12,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:12,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 20:21:12,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:12,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:12,703 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 20:21:12,703 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:12,703 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736311444] [2021-05-02 20:21:12,703 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:12,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1424744615] [2021-05-02 20:21:12,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1424744615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:12,705 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:12,705 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:21:12,708 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822677472] [2021-05-02 20:21:12,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:21:12,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:12,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:21:12,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:21:12,710 INFO L87 Difference]: Start difference. First operand 44 states and 55 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 20:21:12,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:12,807 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2021-05-02 20:21:12,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:21:12,808 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 41 [2021-05-02 20:21:12,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:12,809 INFO L225 Difference]: With dead ends: 56 [2021-05-02 20:21:12,809 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 20:21:12,809 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 45.4ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:21:12,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 20:21:12,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 20:21:12,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 32 states have (on average 1.21875) internal successors, (39), 34 states have internal predecessors, (39), 17 states have call successors, (17), 6 states have call predecessors, (17), 5 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 20:21:12,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 71 transitions. [2021-05-02 20:21:12,815 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 71 transitions. Word has length 41 [2021-05-02 20:21:12,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:12,815 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 71 transitions. [2021-05-02 20:21:12,815 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 20:21:12,815 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 71 transitions. [2021-05-02 20:21:12,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 20:21:12,816 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:12,816 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:13,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:13,037 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:13,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:13,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1581112078, now seen corresponding path program 1 times [2021-05-02 20:21:13,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:13,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806227277] [2021-05-02 20:21:13,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:13,051 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:13,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1555444758] [2021-05-02 20:21:13,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:13,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:13,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 20:21:13,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:13,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,271 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-05-02 20:21:13,271 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:13,271 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806227277] [2021-05-02 20:21:13,271 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:13,271 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555444758] [2021-05-02 20:21:13,271 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1555444758] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:13,272 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:13,272 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:21:13,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62425505] [2021-05-02 20:21:13,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:21:13,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:13,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:21:13,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:21:13,273 INFO L87 Difference]: Start difference. First operand 55 states and 71 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 20:21:13,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:13,373 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2021-05-02 20:21:13,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:21:13,373 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2021-05-02 20:21:13,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:13,374 INFO L225 Difference]: With dead ends: 60 [2021-05-02 20:21:13,374 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 20:21:13,375 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 40.0ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:21:13,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 20:21:13,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2021-05-02 20:21:13,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 35 states have (on average 1.2) internal successors, (42), 37 states have internal predecessors, (42), 17 states have call successors, (17), 7 states have call predecessors, (17), 6 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 20:21:13,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 74 transitions. [2021-05-02 20:21:13,379 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 74 transitions. Word has length 46 [2021-05-02 20:21:13,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:13,380 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 74 transitions. [2021-05-02 20:21:13,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 20:21:13,380 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 74 transitions. [2021-05-02 20:21:13,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 20:21:13,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:13,381 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:13,596 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:13,597 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:13,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:13,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1942645143, now seen corresponding path program 1 times [2021-05-02 20:21:13,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:13,598 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950533013] [2021-05-02 20:21:13,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:13,618 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:13,618 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [471115710] [2021-05-02 20:21:13,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:13,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:13,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 20:21:13,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:13,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:13,911 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 20:21:13,911 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:13,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950533013] [2021-05-02 20:21:13,912 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:13,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471115710] [2021-05-02 20:21:13,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471115710] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:13,912 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:13,912 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:21:13,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648508669] [2021-05-02 20:21:13,913 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:21:13,913 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:13,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:21:13,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:21:13,913 INFO L87 Difference]: Start difference. First operand 59 states and 74 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 20:21:16,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:16,177 INFO L93 Difference]: Finished difference Result 64 states and 78 transitions. [2021-05-02 20:21:16,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:21:16,178 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 51 [2021-05-02 20:21:16,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:16,179 INFO L225 Difference]: With dead ends: 64 [2021-05-02 20:21:16,179 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 20:21:16,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 77.7ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:21:16,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 20:21:16,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 20:21:16,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 17 states have call successors, (17), 8 states have call predecessors, (17), 7 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 20:21:16,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 77 transitions. [2021-05-02 20:21:16,184 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 77 transitions. Word has length 51 [2021-05-02 20:21:16,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:16,184 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 77 transitions. [2021-05-02 20:21:16,184 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 20:21:16,185 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 77 transitions. [2021-05-02 20:21:16,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 20:21:16,185 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:16,185 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:16,386 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-05-02 20:21:16,386 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:16,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:16,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1782154901, now seen corresponding path program 1 times [2021-05-02 20:21:16,387 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:16,387 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511038261] [2021-05-02 20:21:16,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:16,396 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:16,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1885382929] [2021-05-02 20:21:16,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:16,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:16,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 20:21:16,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:16,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:16,614 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-05-02 20:21:16,614 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:16,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511038261] [2021-05-02 20:21:16,614 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:16,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885382929] [2021-05-02 20:21:16,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885382929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:16,615 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:16,615 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:21:16,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389997525] [2021-05-02 20:21:16,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:21:16,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:16,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:21:16,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:21:16,616 INFO L87 Difference]: Start difference. First operand 63 states and 77 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2021-05-02 20:21:16,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:16,740 INFO L93 Difference]: Finished difference Result 94 states and 129 transitions. [2021-05-02 20:21:16,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:21:16,741 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 59 [2021-05-02 20:21:16,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:16,742 INFO L225 Difference]: With dead ends: 94 [2021-05-02 20:21:16,743 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 20:21:16,743 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 46.7ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:21:16,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 20:21:16,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2021-05-02 20:21:16,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 52 states have internal predecessors, (61), 26 states have call successors, (26), 9 states have call predecessors, (26), 8 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 20:21:16,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 111 transitions. [2021-05-02 20:21:16,751 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 111 transitions. Word has length 59 [2021-05-02 20:21:16,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:16,751 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 111 transitions. [2021-05-02 20:21:16,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2021-05-02 20:21:16,751 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 111 transitions. [2021-05-02 20:21:16,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 20:21:16,752 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:16,752 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:16,953 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:16,953 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:16,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:16,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1573186588, now seen corresponding path program 1 times [2021-05-02 20:21:16,954 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:16,954 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810066581] [2021-05-02 20:21:16,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:16,962 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:16,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [234816667] [2021-05-02 20:21:16,963 INFO L95 rtionOrderModulation]: Keeping assertion order 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 20:21:17,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:17,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:21:17,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:17,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,168 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-05-02 20:21:17,168 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:17,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810066581] [2021-05-02 20:21:17,168 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:17,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234816667] [2021-05-02 20:21:17,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234816667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:17,169 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:17,169 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:21:17,169 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328231688] [2021-05-02 20:21:17,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:21:17,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:17,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:21:17,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:21:17,170 INFO L87 Difference]: Start difference. First operand 84 states and 111 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 20:21:17,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:17,217 INFO L93 Difference]: Finished difference Result 99 states and 123 transitions. [2021-05-02 20:21:17,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 20:21:17,218 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 60 [2021-05-02 20:21:17,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:17,219 INFO L225 Difference]: With dead ends: 99 [2021-05-02 20:21:17,219 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 20:21:17,219 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 18.6ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:21:17,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 20:21:17,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-05-02 20:21:17,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 61 states have (on average 1.1967213114754098) internal successors, (73), 64 states have internal predecessors, (73), 26 states have call successors, (26), 12 states have call predecessors, (26), 11 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 20:21:17,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 123 transitions. [2021-05-02 20:21:17,226 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 123 transitions. Word has length 60 [2021-05-02 20:21:17,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:17,226 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 123 transitions. [2021-05-02 20:21:17,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 20:21:17,226 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 123 transitions. [2021-05-02 20:21:17,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 20:21:17,227 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:17,227 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:17,440 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:17,441 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:17,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:17,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1491020248, now seen corresponding path program 1 times [2021-05-02 20:21:17,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:17,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933470531] [2021-05-02 20:21:17,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:17,449 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:17,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1638339740] [2021-05-02 20:21:17,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:17,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:17,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:21:17,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:17,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:17,645 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-05-02 20:21:17,645 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:17,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933470531] [2021-05-02 20:21:17,645 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:17,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638339740] [2021-05-02 20:21:17,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638339740] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:17,645 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:17,645 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:21:17,646 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916965523] [2021-05-02 20:21:17,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:21:17,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:17,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:21:17,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:21:17,649 INFO L87 Difference]: Start difference. First operand 99 states and 123 transitions. Second operand has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 20:21:17,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:17,840 INFO L93 Difference]: Finished difference Result 170 states and 243 transitions. [2021-05-02 20:21:17,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:21:17,841 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 61 [2021-05-02 20:21:17,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:17,844 INFO L225 Difference]: With dead ends: 170 [2021-05-02 20:21:17,844 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 20:21:17,844 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 83.0ms TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:21:17,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 20:21:17,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 142. [2021-05-02 20:21:17,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 87 states have (on average 1.2873563218390804) internal successors, (112), 91 states have internal predecessors, (112), 43 states have call successors, (43), 12 states have call predecessors, (43), 11 states have return successors, (41), 38 states have call predecessors, (41), 41 states have call successors, (41) [2021-05-02 20:21:17,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 196 transitions. [2021-05-02 20:21:17,868 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 196 transitions. Word has length 61 [2021-05-02 20:21:17,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:17,868 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 196 transitions. [2021-05-02 20:21:17,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 20:21:17,869 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 196 transitions. [2021-05-02 20:21:17,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 20:21:17,869 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:17,870 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:18,092 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 20:21:18,092 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:18,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:18,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1948826973, now seen corresponding path program 1 times [2021-05-02 20:21:18,093 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:18,094 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439349989] [2021-05-02 20:21:18,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:18,115 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:18,115 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [981648519] [2021-05-02 20:21:18,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 20:21:18,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:18,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:21:18,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:18,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,305 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-05-02 20:21:18,305 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:18,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439349989] [2021-05-02 20:21:18,305 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:18,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [981648519] [2021-05-02 20:21:18,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [981648519] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:18,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:18,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:21:18,306 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014961819] [2021-05-02 20:21:18,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:21:18,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:18,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:21:18,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:21:18,307 INFO L87 Difference]: Start difference. First operand 142 states and 196 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 20:21:18,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:18,360 INFO L93 Difference]: Finished difference Result 142 states and 195 transitions. [2021-05-02 20:21:18,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 20:21:18,360 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 62 [2021-05-02 20:21:18,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:18,361 INFO L225 Difference]: With dead ends: 142 [2021-05-02 20:21:18,361 INFO L226 Difference]: Without dead ends: 142 [2021-05-02 20:21:18,362 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 20.6ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:21:18,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-05-02 20:21:18,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2021-05-02 20:21:18,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 87 states have (on average 1.2758620689655173) internal successors, (111), 91 states have internal predecessors, (111), 43 states have call successors, (43), 12 states have call predecessors, (43), 11 states have return successors, (41), 38 states have call predecessors, (41), 41 states have call successors, (41) [2021-05-02 20:21:18,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 195 transitions. [2021-05-02 20:21:18,369 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 195 transitions. Word has length 62 [2021-05-02 20:21:18,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:18,369 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 195 transitions. [2021-05-02 20:21:18,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 20:21:18,369 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 195 transitions. [2021-05-02 20:21:18,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-02 20:21:18,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:18,370 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:18,580 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:18,581 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:18,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:18,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1844620331, now seen corresponding path program 1 times [2021-05-02 20:21:18,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:18,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864671801] [2021-05-02 20:21:18,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:18,592 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:18,592 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [938717668] [2021-05-02 20:21:18,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:18,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:18,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:21:18,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:18,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:18,814 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 13 proven. 5 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-05-02 20:21:18,814 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:18,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864671801] [2021-05-02 20:21:18,814 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:18,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938717668] [2021-05-02 20:21:18,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938717668] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:18,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:18,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:21:18,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997895683] [2021-05-02 20:21:18,815 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:21:18,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:18,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:21:18,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:21:18,816 INFO L87 Difference]: Start difference. First operand 142 states and 195 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 20:21:18,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:18,909 INFO L93 Difference]: Finished difference Result 169 states and 222 transitions. [2021-05-02 20:21:18,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 20:21:18,909 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 66 [2021-05-02 20:21:18,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:18,911 INFO L225 Difference]: With dead ends: 169 [2021-05-02 20:21:18,911 INFO L226 Difference]: Without dead ends: 169 [2021-05-02 20:21:18,911 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 31.4ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:21:18,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-02 20:21:18,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 167. [2021-05-02 20:21:18,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 105 states have (on average 1.2380952380952381) internal successors, (130), 108 states have internal predecessors, (130), 46 states have call successors, (46), 16 states have call predecessors, (46), 15 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) [2021-05-02 20:21:18,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 220 transitions. [2021-05-02 20:21:18,923 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 220 transitions. Word has length 66 [2021-05-02 20:21:18,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:18,924 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 220 transitions. [2021-05-02 20:21:18,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 20:21:18,924 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 220 transitions. [2021-05-02 20:21:18,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 20:21:18,926 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:18,926 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:19,147 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 20:21:19,148 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:19,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:19,148 INFO L82 PathProgramCache]: Analyzing trace with hash 918639692, now seen corresponding path program 1 times [2021-05-02 20:21:19,148 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:19,148 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432556330] [2021-05-02 20:21:19,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:19,154 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:19,154 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1962454165] [2021-05-02 20:21:19,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:19,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:19,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 20:21:19,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:19,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,443 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 22 proven. 16 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-05-02 20:21:19,444 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:19,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432556330] [2021-05-02 20:21:19,444 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:19,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962454165] [2021-05-02 20:21:19,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962454165] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:19,444 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:19,444 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 20:21:19,444 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140679733] [2021-05-02 20:21:19,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 20:21:19,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:19,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 20:21:19,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:21:19,445 INFO L87 Difference]: Start difference. First operand 167 states and 220 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 20:21:19,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:19,662 INFO L93 Difference]: Finished difference Result 200 states and 267 transitions. [2021-05-02 20:21:19,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:21:19,663 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 68 [2021-05-02 20:21:19,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:19,664 INFO L225 Difference]: With dead ends: 200 [2021-05-02 20:21:19,665 INFO L226 Difference]: Without dead ends: 199 [2021-05-02 20:21:19,665 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 98.6ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:21:19,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-05-02 20:21:19,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 196. [2021-05-02 20:21:19,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 126 states have (on average 1.2619047619047619) internal successors, (159), 133 states have internal predecessors, (159), 53 states have call successors, (53), 17 states have call predecessors, (53), 16 states have return successors, (50), 45 states have call predecessors, (50), 50 states have call successors, (50) [2021-05-02 20:21:19,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 262 transitions. [2021-05-02 20:21:19,672 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 262 transitions. Word has length 68 [2021-05-02 20:21:19,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:19,673 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 262 transitions. [2021-05-02 20:21:19,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 20:21:19,673 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 262 transitions. [2021-05-02 20:21:19,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 20:21:19,674 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:19,674 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:19,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:19,896 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:19,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:19,896 INFO L82 PathProgramCache]: Analyzing trace with hash -210356579, now seen corresponding path program 2 times [2021-05-02 20:21:19,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:19,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204244124] [2021-05-02 20:21:19,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:19,902 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:19,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [89912769] [2021-05-02 20:21:19,903 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 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 20:21:19,959 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:21:19,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:21:19,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 20:21:19,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:19,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:19,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,241 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 12 proven. 20 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 20:21:20,241 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:20,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204244124] [2021-05-02 20:21:20,241 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:20,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89912769] [2021-05-02 20:21:20,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89912769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:20,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:20,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 20:21:20,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361021370] [2021-05-02 20:21:20,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 20:21:20,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:20,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 20:21:20,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:21:20,243 INFO L87 Difference]: Start difference. First operand 196 states and 262 transitions. Second operand has 11 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 20:21:20,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:20,439 INFO L93 Difference]: Finished difference Result 222 states and 299 transitions. [2021-05-02 20:21:20,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:21:20,440 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) Word has length 73 [2021-05-02 20:21:20,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:20,441 INFO L225 Difference]: With dead ends: 222 [2021-05-02 20:21:20,441 INFO L226 Difference]: Without dead ends: 222 [2021-05-02 20:21:20,442 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 102.5ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-02 20:21:20,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-02 20:21:20,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 219. [2021-05-02 20:21:20,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 138 states have (on average 1.2681159420289856) internal successors, (175), 146 states have internal predecessors, (175), 62 states have call successors, (62), 19 states have call predecessors, (62), 18 states have return successors, (59), 53 states have call predecessors, (59), 59 states have call successors, (59) [2021-05-02 20:21:20,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 296 transitions. [2021-05-02 20:21:20,450 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 296 transitions. Word has length 73 [2021-05-02 20:21:20,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:20,450 INFO L480 AbstractCegarLoop]: Abstraction has 219 states and 296 transitions. [2021-05-02 20:21:20,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 20:21:20,450 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 296 transitions. [2021-05-02 20:21:20,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 20:21:20,451 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:20,451 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:20,664 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 20:21:20,665 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:20,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:20,665 INFO L82 PathProgramCache]: Analyzing trace with hash 952478412, now seen corresponding path program 3 times [2021-05-02 20:21:20,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:20,665 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401601842] [2021-05-02 20:21:20,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:20,671 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:20,671 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [626673215] [2021-05-02 20:21:20,671 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 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 20:21:20,756 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:21:20,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:21:20,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 20:21:20,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:20,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:20,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,195 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 31 proven. 19 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 20:21:21,195 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:21,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401601842] [2021-05-02 20:21:21,195 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:21,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626673215] [2021-05-02 20:21:21,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [626673215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:21,195 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:21,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 20:21:21,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399535199] [2021-05-02 20:21:21,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 20:21:21,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:21,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 20:21:21,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:21:21,197 INFO L87 Difference]: Start difference. First operand 219 states and 296 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 12 states have internal predecessors, (31), 6 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-02 20:21:21,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:21,631 INFO L93 Difference]: Finished difference Result 226 states and 302 transitions. [2021-05-02 20:21:21,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 20:21:21,632 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 12 states have internal predecessors, (31), 6 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) Word has length 78 [2021-05-02 20:21:21,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:21,633 INFO L225 Difference]: With dead ends: 226 [2021-05-02 20:21:21,633 INFO L226 Difference]: Without dead ends: 226 [2021-05-02 20:21:21,633 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 294.0ms TimeCoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2021-05-02 20:21:21,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-05-02 20:21:21,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 223. [2021-05-02 20:21:21,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 141 states have (on average 1.2624113475177305) internal successors, (178), 149 states have internal predecessors, (178), 62 states have call successors, (62), 20 states have call predecessors, (62), 19 states have return successors, (59), 53 states have call predecessors, (59), 59 states have call successors, (59) [2021-05-02 20:21:21,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 299 transitions. [2021-05-02 20:21:21,643 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 299 transitions. Word has length 78 [2021-05-02 20:21:21,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:21,643 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 299 transitions. [2021-05-02 20:21:21,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 12 states have internal predecessors, (31), 6 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-02 20:21:21,643 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 299 transitions. [2021-05-02 20:21:21,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 20:21:21,644 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:21,644 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:21,856 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 20:21:21,857 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:21,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:21,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1350616622, now seen corresponding path program 2 times [2021-05-02 20:21:21,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:21,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242126711] [2021-05-02 20:21:21,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:21,867 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:21,867 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [183500782] [2021-05-02 20:21:21,867 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 20:21:21,941 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:21:21,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:21:21,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 20:21:21,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:21,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:21,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:22,308 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 41 proven. 36 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-05-02 20:21:22,308 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:22,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242126711] [2021-05-02 20:21:22,308 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:22,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [183500782] [2021-05-02 20:21:22,308 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [183500782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:22,308 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:22,308 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 20:21:22,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616119612] [2021-05-02 20:21:22,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 20:21:22,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:22,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 20:21:22,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:21:22,312 INFO L87 Difference]: Start difference. First operand 223 states and 299 transitions. Second operand has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 7 states have call predecessors, (13), 6 states have call successors, (13) [2021-05-02 20:21:22,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:22,715 INFO L93 Difference]: Finished difference Result 235 states and 315 transitions. [2021-05-02 20:21:22,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 20:21:22,715 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 7 states have call predecessors, (13), 6 states have call successors, (13) Word has length 82 [2021-05-02 20:21:22,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:22,717 INFO L225 Difference]: With dead ends: 235 [2021-05-02 20:21:22,717 INFO L226 Difference]: Without dead ends: 235 [2021-05-02 20:21:22,717 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 202.3ms TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-02 20:21:22,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-05-02 20:21:22,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 228. [2021-05-02 20:21:22,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 144 states have (on average 1.2569444444444444) internal successors, (181), 153 states have internal predecessors, (181), 63 states have call successors, (63), 21 states have call predecessors, (63), 20 states have return successors, (60), 53 states have call predecessors, (60), 60 states have call successors, (60) [2021-05-02 20:21:22,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 304 transitions. [2021-05-02 20:21:22,725 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 304 transitions. Word has length 82 [2021-05-02 20:21:22,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:22,725 INFO L480 AbstractCegarLoop]: Abstraction has 228 states and 304 transitions. [2021-05-02 20:21:22,725 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 7 states have call predecessors, (13), 6 states have call successors, (13) [2021-05-02 20:21:22,725 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 304 transitions. [2021-05-02 20:21:22,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 20:21:22,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:22,726 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:22,927 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 20:21:22,927 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:22,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:22,927 INFO L82 PathProgramCache]: Analyzing trace with hash -1080401827, now seen corresponding path program 1 times [2021-05-02 20:21:22,927 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:22,928 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550642193] [2021-05-02 20:21:22,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:22,937 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:22,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1810429401] [2021-05-02 20:21:22,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:22,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:22,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:21:23,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:23,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,148 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 16 proven. 73 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 20:21:23,148 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:23,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550642193] [2021-05-02 20:21:23,148 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:23,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810429401] [2021-05-02 20:21:23,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810429401] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:23,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:23,148 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:21:23,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247758730] [2021-05-02 20:21:23,152 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:21:23,152 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:23,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:21:23,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:21:23,153 INFO L87 Difference]: Start difference. First operand 228 states and 304 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 20:21:23,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:23,241 INFO L93 Difference]: Finished difference Result 231 states and 307 transitions. [2021-05-02 20:21:23,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 20:21:23,241 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 83 [2021-05-02 20:21:23,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:23,243 INFO L225 Difference]: With dead ends: 231 [2021-05-02 20:21:23,243 INFO L226 Difference]: Without dead ends: 231 [2021-05-02 20:21:23,243 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 30.6ms TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:21:23,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-05-02 20:21:23,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2021-05-02 20:21:23,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 147 states have (on average 1.251700680272109) internal successors, (184), 156 states have internal predecessors, (184), 63 states have call successors, (63), 21 states have call predecessors, (63), 20 states have return successors, (60), 53 states have call predecessors, (60), 60 states have call successors, (60) [2021-05-02 20:21:23,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 307 transitions. [2021-05-02 20:21:23,251 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 307 transitions. Word has length 83 [2021-05-02 20:21:23,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:23,251 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 307 transitions. [2021-05-02 20:21:23,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 20:21:23,252 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 307 transitions. [2021-05-02 20:21:23,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-05-02 20:21:23,253 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:23,253 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:23,469 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 20:21:23,469 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:23,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:23,469 INFO L82 PathProgramCache]: Analyzing trace with hash 900405455, now seen corresponding path program 1 times [2021-05-02 20:21:23,469 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:23,469 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464576684] [2021-05-02 20:21:23,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:23,484 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:23,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2025512018] [2021-05-02 20:21:23,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:23,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:23,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 20:21:23,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:23,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:23,874 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 16 proven. 19 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2021-05-02 20:21:23,874 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:23,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464576684] [2021-05-02 20:21:23,874 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:23,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025512018] [2021-05-02 20:21:23,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025512018] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:23,874 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:23,874 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 20:21:23,875 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928916103] [2021-05-02 20:21:23,875 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 20:21:23,875 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:23,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 20:21:23,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:21:23,876 INFO L87 Difference]: Start difference. First operand 231 states and 307 transitions. Second operand has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-02 20:21:24,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:24,324 INFO L93 Difference]: Finished difference Result 261 states and 350 transitions. [2021-05-02 20:21:24,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 20:21:24,324 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 84 [2021-05-02 20:21:24,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:24,326 INFO L225 Difference]: With dead ends: 261 [2021-05-02 20:21:24,326 INFO L226 Difference]: Without dead ends: 260 [2021-05-02 20:21:24,327 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 302.4ms TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-02 20:21:24,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-05-02 20:21:24,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 257. [2021-05-02 20:21:24,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 162 states have (on average 1.2592592592592593) internal successors, (204), 172 states have internal predecessors, (204), 72 states have call successors, (72), 23 states have call predecessors, (72), 22 states have return successors, (69), 61 states have call predecessors, (69), 69 states have call successors, (69) [2021-05-02 20:21:24,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 345 transitions. [2021-05-02 20:21:24,335 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 345 transitions. Word has length 84 [2021-05-02 20:21:24,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:24,336 INFO L480 AbstractCegarLoop]: Abstraction has 257 states and 345 transitions. [2021-05-02 20:21:24,336 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-02 20:21:24,336 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 345 transitions. [2021-05-02 20:21:24,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 20:21:24,337 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:24,337 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:24,557 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 20:21:24,558 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:24,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:24,558 INFO L82 PathProgramCache]: Analyzing trace with hash -2138218929, now seen corresponding path program 2 times [2021-05-02 20:21:24,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:24,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542460988] [2021-05-02 20:21:24,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:24,568 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:24,568 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [486628144] [2021-05-02 20:21:24,568 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 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 20:21:24,665 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:21:24,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:21:24,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 20:21:24,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:24,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:24,829 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 20:21:24,829 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:24,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542460988] [2021-05-02 20:21:24,829 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:24,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [486628144] [2021-05-02 20:21:24,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [486628144] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:24,829 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:24,829 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:21:24,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629669177] [2021-05-02 20:21:24,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:21:24,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:24,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:21:24,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:21:24,830 INFO L87 Difference]: Start difference. First operand 257 states and 345 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 20:21:24,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:24,938 INFO L93 Difference]: Finished difference Result 292 states and 378 transitions. [2021-05-02 20:21:24,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:21:24,938 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 87 [2021-05-02 20:21:24,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:24,940 INFO L225 Difference]: With dead ends: 292 [2021-05-02 20:21:24,940 INFO L226 Difference]: Without dead ends: 292 [2021-05-02 20:21:24,940 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 44.4ms TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:21:24,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-05-02 20:21:24,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 291. [2021-05-02 20:21:24,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 187 states have (on average 1.2299465240641712) internal successors, (230), 196 states have internal predecessors, (230), 75 states have call successors, (75), 29 states have call predecessors, (75), 28 states have return successors, (72), 65 states have call predecessors, (72), 72 states have call successors, (72) [2021-05-02 20:21:24,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 377 transitions. [2021-05-02 20:21:24,951 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 377 transitions. Word has length 87 [2021-05-02 20:21:24,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:24,953 INFO L480 AbstractCegarLoop]: Abstraction has 291 states and 377 transitions. [2021-05-02 20:21:24,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 20:21:24,954 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 377 transitions. [2021-05-02 20:21:24,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 20:21:24,955 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:24,955 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:25,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 20:21:25,185 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:25,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:25,185 INFO L82 PathProgramCache]: Analyzing trace with hash 118626568, now seen corresponding path program 1 times [2021-05-02 20:21:25,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:25,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541872088] [2021-05-02 20:21:25,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:25,207 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:25,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [56768980] [2021-05-02 20:21:25,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:25,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:25,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 20:21:25,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:25,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:25,493 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 21 proven. 78 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 20:21:25,493 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:25,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541872088] [2021-05-02 20:21:25,493 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:25,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56768980] [2021-05-02 20:21:25,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56768980] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:25,493 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:25,493 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:21:25,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51502141] [2021-05-02 20:21:25,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:21:25,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:25,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:21:25,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:21:25,495 INFO L87 Difference]: Start difference. First operand 291 states and 377 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 20:21:25,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:25,627 INFO L93 Difference]: Finished difference Result 293 states and 377 transitions. [2021-05-02 20:21:25,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:21:25,628 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 89 [2021-05-02 20:21:25,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:25,629 INFO L225 Difference]: With dead ends: 293 [2021-05-02 20:21:25,629 INFO L226 Difference]: Without dead ends: 293 [2021-05-02 20:21:25,629 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 44.8ms TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:21:25,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-05-02 20:21:25,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 293. [2021-05-02 20:21:25,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 189 states have (on average 1.216931216931217) internal successors, (230), 198 states have internal predecessors, (230), 75 states have call successors, (75), 29 states have call predecessors, (75), 28 states have return successors, (72), 65 states have call predecessors, (72), 72 states have call successors, (72) [2021-05-02 20:21:25,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 377 transitions. [2021-05-02 20:21:25,638 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 377 transitions. Word has length 89 [2021-05-02 20:21:25,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:25,638 INFO L480 AbstractCegarLoop]: Abstraction has 293 states and 377 transitions. [2021-05-02 20:21:25,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 20:21:25,638 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 377 transitions. [2021-05-02 20:21:25,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 20:21:25,639 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:25,639 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:25,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 20:21:25,861 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:25,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:25,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1881160278, now seen corresponding path program 2 times [2021-05-02 20:21:25,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:25,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995078012] [2021-05-02 20:21:25,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:25,870 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:25,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [453734818] [2021-05-02 20:21:25,870 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 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 20:21:25,947 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:21:25,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:21:25,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 20:21:25,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:26,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,109 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2021-05-02 20:21:26,109 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:26,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995078012] [2021-05-02 20:21:26,110 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:26,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453734818] [2021-05-02 20:21:26,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453734818] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:21:26,110 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:21:26,110 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 20:21:26,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876372603] [2021-05-02 20:21:26,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:21:26,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:26,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:21:26,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:21:26,111 INFO L87 Difference]: Start difference. First operand 293 states and 377 transitions. Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-05-02 20:21:26,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:26,172 INFO L93 Difference]: Finished difference Result 343 states and 457 transitions. [2021-05-02 20:21:26,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:21:26,172 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 93 [2021-05-02 20:21:26,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:26,174 INFO L225 Difference]: With dead ends: 343 [2021-05-02 20:21:26,174 INFO L226 Difference]: Without dead ends: 343 [2021-05-02 20:21:26,175 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 21.8ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:21:26,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2021-05-02 20:21:26,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 310. [2021-05-02 20:21:26,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 200 states have (on average 1.225) internal successors, (245), 208 states have internal predecessors, (245), 81 states have call successors, (81), 29 states have call predecessors, (81), 28 states have return successors, (78), 72 states have call predecessors, (78), 78 states have call successors, (78) [2021-05-02 20:21:26,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 404 transitions. [2021-05-02 20:21:26,186 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 404 transitions. Word has length 93 [2021-05-02 20:21:26,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:26,186 INFO L480 AbstractCegarLoop]: Abstraction has 310 states and 404 transitions. [2021-05-02 20:21:26,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-05-02 20:21:26,186 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 404 transitions. [2021-05-02 20:21:26,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 20:21:26,187 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:26,187 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:26,409 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:26,409 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:26,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:26,410 INFO L82 PathProgramCache]: Analyzing trace with hash 653404933, now seen corresponding path program 1 times [2021-05-02 20:21:26,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:26,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [197594602] [2021-05-02 20:21:26,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:26,416 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:26,416 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1621169448] [2021-05-02 20:21:26,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:21:26,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:21:26,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 73 conjunts are in the unsatisfiable core [2021-05-02 20:21:26,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:26,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:26,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:27,102 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 84 proven. 53 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2021-05-02 20:21:27,102 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:27,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [197594602] [2021-05-02 20:21:27,102 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:27,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621169448] [2021-05-02 20:21:27,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621169448] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:27,102 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:27,102 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 20:21:27,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262409460] [2021-05-02 20:21:27,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 20:21:27,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:27,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 20:21:27,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 20:21:27,104 INFO L87 Difference]: Start difference. First operand 310 states and 404 transitions. Second operand has 16 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (16), 8 states have call predecessors, (16), 7 states have call successors, (16) [2021-05-02 20:21:29,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:29,608 INFO L93 Difference]: Finished difference Result 318 states and 411 transitions. [2021-05-02 20:21:29,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:21:29,609 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (16), 8 states have call predecessors, (16), 7 states have call successors, (16) Word has length 101 [2021-05-02 20:21:29,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:29,610 INFO L225 Difference]: With dead ends: 318 [2021-05-02 20:21:29,610 INFO L226 Difference]: Without dead ends: 318 [2021-05-02 20:21:29,611 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 466.4ms TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-05-02 20:21:29,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-05-02 20:21:29,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 314. [2021-05-02 20:21:29,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 314 states, 203 states have (on average 1.2216748768472907) internal successors, (248), 211 states have internal predecessors, (248), 81 states have call successors, (81), 30 states have call predecessors, (81), 29 states have return successors, (78), 72 states have call predecessors, (78), 78 states have call successors, (78) [2021-05-02 20:21:29,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 407 transitions. [2021-05-02 20:21:29,619 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 407 transitions. Word has length 101 [2021-05-02 20:21:29,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:29,619 INFO L480 AbstractCegarLoop]: Abstraction has 314 states and 407 transitions. [2021-05-02 20:21:29,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (16), 8 states have call predecessors, (16), 7 states have call successors, (16) [2021-05-02 20:21:29,620 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 407 transitions. [2021-05-02 20:21:29,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 20:21:29,620 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:29,621 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:29,842 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 20:21:29,842 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:29,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:29,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1232145013, now seen corresponding path program 3 times [2021-05-02 20:21:29,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:29,843 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923942256] [2021-05-02 20:21:29,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:29,857 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:29,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1504045501] [2021-05-02 20:21:29,857 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 20:21:29,926 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 20:21:29,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:21:29,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 20:21:29,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:29,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:29,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:30,845 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 67 proven. 56 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2021-05-02 20:21:30,845 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:30,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923942256] [2021-05-02 20:21:30,846 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:30,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504045501] [2021-05-02 20:21:30,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504045501] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:30,846 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:30,846 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 20:21:30,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039727489] [2021-05-02 20:21:30,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 20:21:30,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:30,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 20:21:30,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-05-02 20:21:30,848 INFO L87 Difference]: Start difference. First operand 314 states and 407 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 20:21:36,761 WARN L205 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 31 [2021-05-02 20:21:47,287 WARN L205 SmtUtils]: Spent 471.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 16 [2021-05-02 20:21:52,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:21:52,857 INFO L93 Difference]: Finished difference Result 326 states and 423 transitions. [2021-05-02 20:21:52,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 20:21:52,858 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) Word has length 105 [2021-05-02 20:21:52,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:21:52,860 INFO L225 Difference]: With dead ends: 326 [2021-05-02 20:21:52,860 INFO L226 Difference]: Without dead ends: 326 [2021-05-02 20:21:52,860 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 3090.6ms TimeCoverageRelationStatistics Valid=63, Invalid=357, Unknown=0, NotChecked=0, Total=420 [2021-05-02 20:21:52,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2021-05-02 20:21:52,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 319. [2021-05-02 20:21:52,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 206 states have (on average 1.2184466019417475) internal successors, (251), 215 states have internal predecessors, (251), 82 states have call successors, (82), 31 states have call predecessors, (82), 30 states have return successors, (79), 72 states have call predecessors, (79), 79 states have call successors, (79) [2021-05-02 20:21:52,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 412 transitions. [2021-05-02 20:21:52,869 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 412 transitions. Word has length 105 [2021-05-02 20:21:52,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:21:52,870 INFO L480 AbstractCegarLoop]: Abstraction has 319 states and 412 transitions. [2021-05-02 20:21:52,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 20:21:52,870 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 412 transitions. [2021-05-02 20:21:52,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 20:21:52,871 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:21:52,871 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:21:53,072 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:21:53,072 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:21:53,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:21:53,072 INFO L82 PathProgramCache]: Analyzing trace with hash -1212495288, now seen corresponding path program 2 times [2021-05-02 20:21:53,072 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:21:53,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182012830] [2021-05-02 20:21:53,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:21:53,078 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:21:53,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [257662819] [2021-05-02 20:21:53,078 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 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 20:21:53,166 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:21:53,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:21:53,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 20:21:53,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:21:53,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,580 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2021-05-02 20:21:53,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,890 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2021-05-02 20:21:53,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:53,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:54,235 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2021-05-02 20:21:54,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:54,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:54,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:54,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:54,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:54,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:54,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:54,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:55,046 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2021-05-02 20:21:55,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:55,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:55,411 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-02 20:21:55,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:55,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:55,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:55,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:55,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:55,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:55,976 WARN L205 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2021-05-02 20:21:56,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:56,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:21:56,857 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 69 proven. 69 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2021-05-02 20:21:56,857 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:21:56,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182012830] [2021-05-02 20:21:56,857 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:21:56,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257662819] [2021-05-02 20:21:56,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257662819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:21:56,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:21:56,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-05-02 20:21:56,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659637725] [2021-05-02 20:21:56,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 20:21:56,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:21:56,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 20:21:56,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-05-02 20:21:56,858 INFO L87 Difference]: Start difference. First operand 319 states and 412 transitions. Second operand has 17 states, 16 states have (on average 2.1875) internal successors, (35), 14 states have internal predecessors, (35), 8 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2021-05-02 20:22:00,689 WARN L205 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 27 [2021-05-02 20:22:01,498 WARN L205 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 27 [2021-05-02 20:22:02,032 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2021-05-02 20:22:03,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:22:03,587 INFO L93 Difference]: Finished difference Result 351 states and 456 transitions. [2021-05-02 20:22:03,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 20:22:03,588 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.1875) internal successors, (35), 14 states have internal predecessors, (35), 8 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) Word has length 107 [2021-05-02 20:22:03,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:22:03,590 INFO L225 Difference]: With dead ends: 351 [2021-05-02 20:22:03,590 INFO L226 Difference]: Without dead ends: 350 [2021-05-02 20:22:03,590 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 4621.8ms TimeCoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2021-05-02 20:22:03,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2021-05-02 20:22:03,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 345. [2021-05-02 20:22:03,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 221 states have (on average 1.2217194570135748) internal successors, (270), 231 states have internal predecessors, (270), 91 states have call successors, (91), 33 states have call predecessors, (91), 32 states have return successors, (88), 80 states have call predecessors, (88), 88 states have call successors, (88) [2021-05-02 20:22:03,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 449 transitions. [2021-05-02 20:22:03,600 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 449 transitions. Word has length 107 [2021-05-02 20:22:03,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:22:03,601 INFO L480 AbstractCegarLoop]: Abstraction has 345 states and 449 transitions. [2021-05-02 20:22:03,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.1875) internal successors, (35), 14 states have internal predecessors, (35), 8 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2021-05-02 20:22:03,601 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 449 transitions. [2021-05-02 20:22:03,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 20:22:03,602 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:22:03,602 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:22:03,825 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 20:22:03,825 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:22:03,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:22:03,826 INFO L82 PathProgramCache]: Analyzing trace with hash 2102989309, now seen corresponding path program 2 times [2021-05-02 20:22:03,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:22:03,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961854388] [2021-05-02 20:22:03,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:22:03,830 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:22:03,830 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1244085964] [2021-05-02 20:22:03,831 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 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 20:22:03,915 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:22:03,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:22:03,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 20:22:03,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:22:04,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:04,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:05,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:05,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:05,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:05,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:05,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:05,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:05,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:05,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:06,017 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 47 proven. 52 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-05-02 20:22:06,018 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:22:06,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961854388] [2021-05-02 20:22:06,018 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:22:06,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244085964] [2021-05-02 20:22:06,018 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1244085964] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:22:06,018 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:22:06,018 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 20:22:06,018 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076480838] [2021-05-02 20:22:06,019 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 20:22:06,019 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:22:06,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 20:22:06,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:22:06,020 INFO L87 Difference]: Start difference. First operand 345 states and 449 transitions. Second operand has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 20:22:08,422 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 13 [2021-05-02 20:22:12,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:22:12,918 INFO L93 Difference]: Finished difference Result 406 states and 543 transitions. [2021-05-02 20:22:12,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 20:22:12,919 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) Word has length 109 [2021-05-02 20:22:12,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:22:12,923 INFO L225 Difference]: With dead ends: 406 [2021-05-02 20:22:12,923 INFO L226 Difference]: Without dead ends: 406 [2021-05-02 20:22:12,923 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 3512.2ms TimeCoverageRelationStatistics Valid=111, Invalid=591, Unknown=0, NotChecked=0, Total=702 [2021-05-02 20:22:12,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-05-02 20:22:12,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 367. [2021-05-02 20:22:12,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 233 states have (on average 1.2274678111587982) internal successors, (286), 243 states have internal predecessors, (286), 99 states have call successors, (99), 35 states have call predecessors, (99), 34 states have return successors, (96), 88 states have call predecessors, (96), 96 states have call successors, (96) [2021-05-02 20:22:12,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 481 transitions. [2021-05-02 20:22:12,937 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 481 transitions. Word has length 109 [2021-05-02 20:22:12,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:22:12,937 INFO L480 AbstractCegarLoop]: Abstraction has 367 states and 481 transitions. [2021-05-02 20:22:12,937 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 20:22:12,937 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 481 transitions. [2021-05-02 20:22:12,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 20:22:12,938 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:22:12,938 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:22:13,160 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 20:22:13,160 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:22:13,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:22:13,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1392800366, now seen corresponding path program 2 times [2021-05-02 20:22:13,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:22:13,161 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262959462] [2021-05-02 20:22:13,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:22:13,166 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:22:13,166 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [526843570] [2021-05-02 20:22:13,166 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 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 20:22:13,223 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:22:13,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:22:13,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:22:13,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:22:13,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:13,845 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 24 proven. 221 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-05-02 20:22:13,845 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:22:13,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262959462] [2021-05-02 20:22:13,845 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:22:13,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526843570] [2021-05-02 20:22:13,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526843570] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:22:13,846 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:22:13,846 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 20:22:13,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85546897] [2021-05-02 20:22:13,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 20:22:13,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:22:13,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 20:22:13,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:22:13,846 INFO L87 Difference]: Start difference. First operand 367 states and 481 transitions. Second operand has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 20:22:14,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:22:14,752 INFO L93 Difference]: Finished difference Result 414 states and 523 transitions. [2021-05-02 20:22:14,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 20:22:14,753 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) Word has length 110 [2021-05-02 20:22:14,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:22:14,755 INFO L225 Difference]: With dead ends: 414 [2021-05-02 20:22:14,755 INFO L226 Difference]: Without dead ends: 414 [2021-05-02 20:22:14,755 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 731.6ms TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:22:14,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2021-05-02 20:22:14,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 413. [2021-05-02 20:22:14,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 267 states have (on average 1.202247191011236) internal successors, (321), 276 states have internal predecessors, (321), 102 states have call successors, (102), 44 states have call predecessors, (102), 43 states have return successors, (99), 92 states have call predecessors, (99), 99 states have call successors, (99) [2021-05-02 20:22:14,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 522 transitions. [2021-05-02 20:22:14,766 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 522 transitions. Word has length 110 [2021-05-02 20:22:14,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:22:14,766 INFO L480 AbstractCegarLoop]: Abstraction has 413 states and 522 transitions. [2021-05-02 20:22:14,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 20:22:14,766 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 522 transitions. [2021-05-02 20:22:14,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-02 20:22:14,767 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:22:14,767 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:22:14,988 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 20:22:14,988 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:22:14,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:22:14,989 INFO L82 PathProgramCache]: Analyzing trace with hash -194014662, now seen corresponding path program 3 times [2021-05-02 20:22:14,989 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:22:14,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752616309] [2021-05-02 20:22:14,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:22:14,999 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:22:15,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1710223865] [2021-05-02 20:22:15,000 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 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 20:22:15,062 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:22:15,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:22:15,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:22:15,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:22:15,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:15,589 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 44 proven. 11 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-05-02 20:22:15,589 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:22:15,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752616309] [2021-05-02 20:22:15,589 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:22:15,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710223865] [2021-05-02 20:22:15,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710223865] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:22:15,590 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:22:15,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:22:15,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074044021] [2021-05-02 20:22:15,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:22:15,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:22:15,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:22:15,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:22:15,591 INFO L87 Difference]: Start difference. First operand 413 states and 522 transitions. Second operand has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 7 states have internal predecessors, (33), 4 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-05-02 20:22:16,381 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 8 [2021-05-02 20:22:16,846 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 8 [2021-05-02 20:22:17,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:22:17,921 INFO L93 Difference]: Finished difference Result 574 states and 785 transitions. [2021-05-02 20:22:17,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:22:17,922 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 7 states have internal predecessors, (33), 4 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 111 [2021-05-02 20:22:17,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:22:17,924 INFO L225 Difference]: With dead ends: 574 [2021-05-02 20:22:17,924 INFO L226 Difference]: Without dead ends: 574 [2021-05-02 20:22:17,924 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 1246.0ms TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2021-05-02 20:22:17,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2021-05-02 20:22:17,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 457. [2021-05-02 20:22:17,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 297 states have (on average 1.2222222222222223) internal successors, (363), 304 states have internal predecessors, (363), 116 states have call successors, (116), 44 states have call predecessors, (116), 43 states have return successors, (113), 108 states have call predecessors, (113), 113 states have call successors, (113) [2021-05-02 20:22:17,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 592 transitions. [2021-05-02 20:22:17,939 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 592 transitions. Word has length 111 [2021-05-02 20:22:17,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:22:17,939 INFO L480 AbstractCegarLoop]: Abstraction has 457 states and 592 transitions. [2021-05-02 20:22:17,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 7 states have internal predecessors, (33), 4 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-05-02 20:22:17,939 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 592 transitions. [2021-05-02 20:22:17,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-05-02 20:22:17,940 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:22:17,940 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:22:18,156 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 20:22:18,156 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:22:18,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:22:18,157 INFO L82 PathProgramCache]: Analyzing trace with hash -793672821, now seen corresponding path program 2 times [2021-05-02 20:22:18,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:22:18,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944440302] [2021-05-02 20:22:18,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:22:18,163 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:22:18,163 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1161026788] [2021-05-02 20:22:18,164 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 20:22:18,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:22:18,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:22:18,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:22:18,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:22:18,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:18,842 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 29 proven. 222 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-05-02 20:22:18,842 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:22:18,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944440302] [2021-05-02 20:22:18,843 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:22:18,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161026788] [2021-05-02 20:22:18,843 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161026788] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:22:18,843 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:22:18,843 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 20:22:18,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047036317] [2021-05-02 20:22:18,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 20:22:18,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:22:18,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 20:22:18,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:22:18,844 INFO L87 Difference]: Start difference. First operand 457 states and 592 transitions. Second operand has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 20:22:19,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:22:19,716 INFO L93 Difference]: Finished difference Result 459 states and 591 transitions. [2021-05-02 20:22:19,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 20:22:19,717 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) Word has length 112 [2021-05-02 20:22:19,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:22:19,719 INFO L225 Difference]: With dead ends: 459 [2021-05-02 20:22:19,719 INFO L226 Difference]: Without dead ends: 459 [2021-05-02 20:22:19,719 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 739.3ms TimeCoverageRelationStatistics Valid=58, Invalid=98, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:22:19,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2021-05-02 20:22:19,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 459. [2021-05-02 20:22:19,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 299 states have (on average 1.2107023411371238) internal successors, (362), 306 states have internal predecessors, (362), 116 states have call successors, (116), 44 states have call predecessors, (116), 43 states have return successors, (113), 108 states have call predecessors, (113), 113 states have call successors, (113) [2021-05-02 20:22:19,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 591 transitions. [2021-05-02 20:22:19,729 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 591 transitions. Word has length 112 [2021-05-02 20:22:19,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:22:19,730 INFO L480 AbstractCegarLoop]: Abstraction has 459 states and 591 transitions. [2021-05-02 20:22:19,730 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 20:22:19,730 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 591 transitions. [2021-05-02 20:22:19,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-02 20:22:19,731 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:22:19,731 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:22:19,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 20:22:19,945 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:22:19,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:22:19,945 INFO L82 PathProgramCache]: Analyzing trace with hash 791718745, now seen corresponding path program 3 times [2021-05-02 20:22:19,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:22:19,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254359944] [2021-05-02 20:22:19,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:22:19,950 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:22:19,950 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1529012799] [2021-05-02 20:22:19,950 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 20:22:20,016 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 20:22:20,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:22:20,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 20:22:20,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:22:20,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:20,674 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 32 proven. 229 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-05-02 20:22:20,674 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:22:20,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254359944] [2021-05-02 20:22:20,674 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:22:20,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529012799] [2021-05-02 20:22:20,674 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529012799] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:22:20,674 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:22:20,674 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:22:20,674 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040592400] [2021-05-02 20:22:20,675 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:22:20,675 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:22:20,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:22:20,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:22:20,675 INFO L87 Difference]: Start difference. First operand 459 states and 591 transitions. Second operand has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 20:22:22,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:22:22,016 INFO L93 Difference]: Finished difference Result 533 states and 663 transitions. [2021-05-02 20:22:22,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:22:22,017 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) Word has length 116 [2021-05-02 20:22:22,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:22:22,019 INFO L225 Difference]: With dead ends: 533 [2021-05-02 20:22:22,019 INFO L226 Difference]: Without dead ends: 533 [2021-05-02 20:22:22,019 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 941.0ms TimeCoverageRelationStatistics Valid=78, Invalid=132, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:22:22,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2021-05-02 20:22:22,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 523. [2021-05-02 20:22:22,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 523 states, 344 states have (on average 1.191860465116279) internal successors, (410), 351 states have internal predecessors, (410), 124 states have call successors, (124), 55 states have call predecessors, (124), 54 states have return successors, (120), 116 states have call predecessors, (120), 120 states have call successors, (120) [2021-05-02 20:22:22,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 523 states to 523 states and 654 transitions. [2021-05-02 20:22:22,030 INFO L78 Accepts]: Start accepts. Automaton has 523 states and 654 transitions. Word has length 116 [2021-05-02 20:22:22,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:22:22,030 INFO L480 AbstractCegarLoop]: Abstraction has 523 states and 654 transitions. [2021-05-02 20:22:22,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 20:22:22,030 INFO L276 IsEmpty]: Start isEmpty. Operand 523 states and 654 transitions. [2021-05-02 20:22:22,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 20:22:22,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:22:22,031 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:22:22,232 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:22:22,232 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:22:22,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:22:22,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1178507345, now seen corresponding path program 3 times [2021-05-02 20:22:22,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:22:22,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116886281] [2021-05-02 20:22:22,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:22:22,238 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:22:22,238 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [138258379] [2021-05-02 20:22:22,238 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 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 20:22:22,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:22:22,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:22:22,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 20:22:22,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:22:22,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:22,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:22,683 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2021-05-02 20:22:22,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:22,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:22,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:22,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:22,941 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2021-05-02 20:22:22,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:22,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:22,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:22,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:22,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:22,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:23,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:23,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:23,264 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2021-05-02 20:22:23,505 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2021-05-02 20:22:23,787 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2021-05-02 20:22:23,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:23,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:23,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:23,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:23,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:23,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:23,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:23,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,159 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-02 20:22:24,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,683 WARN L205 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2021-05-02 20:22:24,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:24,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:25,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:25,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:25,333 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 379 trivial. 0 not checked. [2021-05-02 20:22:25,334 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:22:25,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116886281] [2021-05-02 20:22:25,334 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:22:25,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [138258379] [2021-05-02 20:22:25,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [138258379] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:22:25,334 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:22:25,334 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 20:22:25,334 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893418397] [2021-05-02 20:22:25,334 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 20:22:25,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:22:25,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 20:22:25,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:22:25,335 INFO L87 Difference]: Start difference. First operand 523 states and 654 transitions. Second operand has 15 states, 15 states have (on average 2.533333333333333) internal successors, (38), 13 states have internal predecessors, (38), 7 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) [2021-05-02 20:22:26,416 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-02 20:22:27,323 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-02 20:22:27,918 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-02 20:22:28,836 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2021-05-02 20:22:29,857 WARN L205 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2021-05-02 20:22:31,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:22:31,055 INFO L93 Difference]: Finished difference Result 568 states and 711 transitions. [2021-05-02 20:22:31,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:22:31,056 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.533333333333333) internal successors, (38), 13 states have internal predecessors, (38), 7 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) Word has length 123 [2021-05-02 20:22:31,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:22:31,057 INFO L225 Difference]: With dead ends: 568 [2021-05-02 20:22:31,058 INFO L226 Difference]: Without dead ends: 568 [2021-05-02 20:22:31,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 4263.3ms TimeCoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2021-05-02 20:22:31,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2021-05-02 20:22:31,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 560. [2021-05-02 20:22:31,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 560 states, 365 states have (on average 1.1917808219178083) internal successors, (435), 372 states have internal predecessors, (435), 136 states have call successors, (136), 59 states have call predecessors, (136), 58 states have return successors, (132), 128 states have call predecessors, (132), 132 states have call successors, (132) [2021-05-02 20:22:31,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 560 states to 560 states and 703 transitions. [2021-05-02 20:22:31,069 INFO L78 Accepts]: Start accepts. Automaton has 560 states and 703 transitions. Word has length 123 [2021-05-02 20:22:31,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:22:31,070 INFO L480 AbstractCegarLoop]: Abstraction has 560 states and 703 transitions. [2021-05-02 20:22:31,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.533333333333333) internal successors, (38), 13 states have internal predecessors, (38), 7 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) [2021-05-02 20:22:31,070 INFO L276 IsEmpty]: Start isEmpty. Operand 560 states and 703 transitions. [2021-05-02 20:22:31,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-02 20:22:31,071 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:22:31,071 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:22:31,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 20:22:31,285 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:22:31,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:22:31,285 INFO L82 PathProgramCache]: Analyzing trace with hash -351372628, now seen corresponding path program 4 times [2021-05-02 20:22:31,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:22:31,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796742909] [2021-05-02 20:22:31,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:22:31,292 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:22:31,292 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2122255809] [2021-05-02 20:22:31,292 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 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 20:22:31,357 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 20:22:31,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:22:31,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 20:22:31,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:22:31,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:31,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:31,740 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2021-05-02 20:22:31,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:31,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:31,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:31,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,015 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-02 20:22:32,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,364 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2021-05-02 20:22:32,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:32,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:33,257 WARN L205 SmtUtils]: Spent 371.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 30 [2021-05-02 20:22:33,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:33,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:33,607 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2021-05-02 20:22:33,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:33,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:33,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:33,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:33,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:33,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:34,252 WARN L205 SmtUtils]: Spent 380.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2021-05-02 20:22:34,569 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2021-05-02 20:22:34,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:34,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:34,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:34,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:34,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:34,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:34,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:34,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:35,269 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 96 proven. 93 refuted. 0 times theorem prover too weak. 327 trivial. 0 not checked. [2021-05-02 20:22:35,270 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:22:35,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796742909] [2021-05-02 20:22:35,270 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:22:35,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122255809] [2021-05-02 20:22:35,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2122255809] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:22:35,270 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:22:35,270 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 20:22:35,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030088431] [2021-05-02 20:22:35,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 20:22:35,271 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:22:35,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 20:22:35,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 20:22:35,271 INFO L87 Difference]: Start difference. First operand 560 states and 703 transitions. Second operand has 16 states, 16 states have (on average 2.3125) internal successors, (37), 13 states have internal predecessors, (37), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) [2021-05-02 20:22:40,910 WARN L205 SmtUtils]: Spent 399.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 34 [2021-05-02 20:22:41,736 WARN L205 SmtUtils]: Spent 400.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34 [2021-05-02 20:22:45,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:22:45,431 INFO L93 Difference]: Finished difference Result 573 states and 714 transitions. [2021-05-02 20:22:45,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 20:22:45,432 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 13 states have internal predecessors, (37), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) Word has length 124 [2021-05-02 20:22:45,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:22:45,434 INFO L225 Difference]: With dead ends: 573 [2021-05-02 20:22:45,434 INFO L226 Difference]: Without dead ends: 573 [2021-05-02 20:22:45,434 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 4666.7ms TimeCoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2021-05-02 20:22:45,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2021-05-02 20:22:45,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 568. [2021-05-02 20:22:45,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 568 states, 371 states have (on average 1.1886792452830188) internal successors, (441), 378 states have internal predecessors, (441), 136 states have call successors, (136), 61 states have call predecessors, (136), 60 states have return successors, (132), 128 states have call predecessors, (132), 132 states have call successors, (132) [2021-05-02 20:22:45,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 568 states to 568 states and 709 transitions. [2021-05-02 20:22:45,467 INFO L78 Accepts]: Start accepts. Automaton has 568 states and 709 transitions. Word has length 124 [2021-05-02 20:22:45,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:22:45,468 INFO L480 AbstractCegarLoop]: Abstraction has 568 states and 709 transitions. [2021-05-02 20:22:45,468 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 13 states have internal predecessors, (37), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) [2021-05-02 20:22:45,468 INFO L276 IsEmpty]: Start isEmpty. Operand 568 states and 709 transitions. [2021-05-02 20:22:45,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-02 20:22:45,469 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:22:45,469 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:22:45,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-02 20:22:45,685 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:22:45,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:22:45,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1864178098, now seen corresponding path program 4 times [2021-05-02 20:22:45,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:22:45,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943454796] [2021-05-02 20:22:45,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:22:45,690 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:22:45,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [976592576] [2021-05-02 20:22:45,691 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 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 20:22:45,758 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 20:22:45,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:22:45,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 20:22:45,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:22:45,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,895 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 12 [2021-05-02 20:22:46,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:46,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:47,285 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2021-05-02 20:22:47,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:47,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:47,601 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 14 [2021-05-02 20:22:47,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:47,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:47,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:47,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:47,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:47,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:48,023 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2021-05-02 20:22:48,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:48,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:48,375 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 14 [2021-05-02 20:22:48,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:48,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:48,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:48,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:48,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:48,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:48,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:48,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:22:49,151 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 92 proven. 123 refuted. 0 times theorem prover too weak. 375 trivial. 0 not checked. [2021-05-02 20:22:49,151 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:22:49,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943454796] [2021-05-02 20:22:49,152 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:22:49,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976592576] [2021-05-02 20:22:49,152 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976592576] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:22:49,152 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:22:49,152 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-05-02 20:22:49,152 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809578248] [2021-05-02 20:22:49,152 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 20:22:49,152 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:22:49,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 20:22:49,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=261, Unknown=0, NotChecked=0, Total=306 [2021-05-02 20:22:49,153 INFO L87 Difference]: Start difference. First operand 568 states and 709 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 13 states have internal predecessors, (36), 10 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) [2021-05-02 20:22:50,495 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 7 DAG size of output: 6 [2021-05-02 20:22:55,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:22:55,894 INFO L93 Difference]: Finished difference Result 575 states and 715 transitions. [2021-05-02 20:22:55,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:22:55,895 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 13 states have internal predecessors, (36), 10 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) Word has length 128 [2021-05-02 20:22:55,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:22:55,898 INFO L225 Difference]: With dead ends: 575 [2021-05-02 20:22:55,898 INFO L226 Difference]: Without dead ends: 573 [2021-05-02 20:22:55,898 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 4146.4ms TimeCoverageRelationStatistics Valid=97, Invalid=605, Unknown=0, NotChecked=0, Total=702 [2021-05-02 20:22:55,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2021-05-02 20:22:55,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 570. [2021-05-02 20:22:55,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 570 states, 373 states have (on average 1.1849865951742626) internal successors, (442), 379 states have internal predecessors, (442), 136 states have call successors, (136), 62 states have call predecessors, (136), 60 states have return successors, (132), 128 states have call predecessors, (132), 132 states have call successors, (132) [2021-05-02 20:22:55,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 570 states to 570 states and 710 transitions. [2021-05-02 20:22:55,910 INFO L78 Accepts]: Start accepts. Automaton has 570 states and 710 transitions. Word has length 128 [2021-05-02 20:22:55,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:22:55,910 INFO L480 AbstractCegarLoop]: Abstraction has 570 states and 710 transitions. [2021-05-02 20:22:55,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 13 states have internal predecessors, (36), 10 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) [2021-05-02 20:22:55,910 INFO L276 IsEmpty]: Start isEmpty. Operand 570 states and 710 transitions. [2021-05-02 20:22:55,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-02 20:22:55,911 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:22:55,911 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:22:56,124 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:22:56,125 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:22:56,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:22:56,125 INFO L82 PathProgramCache]: Analyzing trace with hash 1703433466, now seen corresponding path program 5 times [2021-05-02 20:22:56,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:22:56,125 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789241476] [2021-05-02 20:22:56,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:22:56,129 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:22:56,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1595635809] [2021-05-02 20:22:56,130 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 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