/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/divbin2_valuebound10.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 20:04:09,120 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 20:04:09,125 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 20:04:09,145 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 20:04:09,146 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 20:04:09,146 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 20:04:09,147 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 20:04:09,149 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 20:04:09,150 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 20:04:09,150 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 20:04:09,151 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 20:04:09,152 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 20:04:09,152 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 20:04:09,153 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 20:04:09,153 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 20:04:09,154 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 20:04:09,155 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 20:04:09,156 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 20:04:09,157 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 20:04:09,159 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 20:04:09,161 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 20:04:09,162 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 20:04:09,163 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 20:04:09,164 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 20:04:09,166 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 20:04:09,172 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 20:04:09,173 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 20:04:09,173 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 20:04:09,175 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 20:04:09,182 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 20:04:09,183 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 20:04:09,184 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 20:04:09,184 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 20:04:09,184 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 20:04:09,184 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 20:04:09,184 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 20:04:09,184 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 20:04:09,184 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 20:04:09,185 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 20:04:09,185 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 20:04:09,185 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 20:04:09,185 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 20:04:09,185 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 20:04:09,185 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 20:04:09,185 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 20:04:09,186 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 20:04:09,186 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 20:04:09,186 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 20:04:09,186 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 20:04:09,186 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 20:04:09,187 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 20:04:09,187 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 20:04:09,454 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 20:04:09,475 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 20:04:09,477 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 20:04:09,481 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 20:04:09,481 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 20:04:09,482 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_valuebound10.i [2021-05-02 20:04:09,539 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/27c001f0e/2f1949fa9f08434db33f5b65f546d7a4/FLAG8d5f75d71 [2021-05-02 20:04:09,912 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 20:04:09,912 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_valuebound10.i [2021-05-02 20:04:09,917 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/27c001f0e/2f1949fa9f08434db33f5b65f546d7a4/FLAG8d5f75d71 [2021-05-02 20:04:10,316 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/27c001f0e/2f1949fa9f08434db33f5b65f546d7a4 [2021-05-02 20:04:10,318 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 20:04:10,319 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 20:04:10,320 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 20:04:10,320 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 20:04:10,325 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 20:04:10,325 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:04:10" (1/1) ... [2021-05-02 20:04:10,326 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@88324bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:04:10, skipping insertion in model container [2021-05-02 20:04:10,326 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:04:10" (1/1) ... [2021-05-02 20:04:10,331 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 20:04:10,342 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 20:04:10,421 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/divbin2_valuebound10.i[959,972] [2021-05-02 20:04:10,429 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:04:10,433 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 20:04:10,441 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/divbin2_valuebound10.i[959,972] [2021-05-02 20:04:10,444 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:04:10,453 INFO L208 MainTranslator]: Completed translation [2021-05-02 20:04:10,454 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:04:10 WrapperNode [2021-05-02 20:04:10,454 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 20:04:10,454 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 20:04:10,454 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 20:04:10,455 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 20:04:10,492 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:04:10" (1/1) ... [2021-05-02 20:04:10,492 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:04:10" (1/1) ... [2021-05-02 20:04:10,496 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:04:10" (1/1) ... [2021-05-02 20:04:10,496 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:04:10" (1/1) ... [2021-05-02 20:04:10,500 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:04:10" (1/1) ... [2021-05-02 20:04:10,505 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:04:10" (1/1) ... [2021-05-02 20:04:10,508 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:04:10" (1/1) ... [2021-05-02 20:04:10,510 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 20:04:10,510 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 20:04:10,510 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 20:04:10,511 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 20:04:10,511 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:04:10" (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 20:04:10,559 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 20:04:10,559 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 20:04:10,559 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 20:04:10,560 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 20:04:10,560 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 20:04:10,560 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 20:04:10,560 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 20:04:10,560 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 20:04:10,560 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 20:04:10,560 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 20:04:10,560 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 20:04:10,560 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 20:04:10,560 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 20:04:10,560 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 20:04:10,560 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 20:04:10,561 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 20:04:10,561 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 20:04:10,561 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 20:04:10,561 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 20:04:10,561 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 20:04:10,561 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 20:04:10,561 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 20:04:10,753 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 20:04:10,754 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 20:04:10,755 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:04:10 BoogieIcfgContainer [2021-05-02 20:04:10,755 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 20:04:10,755 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 20:04:10,755 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 20:04:10,756 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 20:04:10,758 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:04:10" (1/1) ... [2021-05-02 20:04:10,769 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:04:10 BasicIcfg [2021-05-02 20:04:10,769 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 20:04:10,770 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 20:04:10,770 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 20:04:10,772 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 20:04:10,772 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 08:04:10" (1/4) ... [2021-05-02 20:04:10,772 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54df4bb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:04:10, skipping insertion in model container [2021-05-02 20:04:10,772 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:04:10" (2/4) ... [2021-05-02 20:04:10,773 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54df4bb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:04:10, skipping insertion in model container [2021-05-02 20:04:10,773 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:04:10" (3/4) ... [2021-05-02 20:04:10,773 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54df4bb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 08:04:10, skipping insertion in model container [2021-05-02 20:04:10,773 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:04:10" (4/4) ... [2021-05-02 20:04:10,774 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_valuebound10.iJordan [2021-05-02 20:04:10,789 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 20:04:10,792 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 20:04:10,805 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 20:04:10,817 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 20:04:10,817 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 20:04:10,817 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 20:04:10,818 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 20:04:10,818 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 20:04:10,818 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 20:04:10,818 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 20:04:10,818 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 20:04:10,841 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:04:10,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 20:04:10,847 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:10,847 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:04:10,848 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:10,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:10,855 INFO L82 PathProgramCache]: Analyzing trace with hash 483266332, now seen corresponding path program 1 times [2021-05-02 20:04:10,860 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:10,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011565283] [2021-05-02 20:04:10,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:10,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:04:11,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 20:04:11,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:04:11,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 20:04:11,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:04:11,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:04:11,074 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:11,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011565283] [2021-05-02 20:04:11,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011565283] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:04:11,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:04:11,075 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 20:04:11,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682873224] [2021-05-02 20:04:11,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 20:04:11,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:11,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 20:04:11,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:04:11,088 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 20:04:11,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:11,140 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2021-05-02 20:04:11,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 20:04:11,141 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 20:04:11,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:11,146 INFO L225 Difference]: With dead ends: 30 [2021-05-02 20:04:11,146 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 20:04:11,147 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 33.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:04:11,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 20:04:11,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-02 20:04:11,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:04:11,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-02 20:04:11,173 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 18 [2021-05-02 20:04:11,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:11,173 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-02 20:04:11,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 20:04:11,173 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-02 20:04:11,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 20:04:11,174 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:11,174 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:04:11,175 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 20:04:11,175 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:11,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:11,176 INFO L82 PathProgramCache]: Analyzing trace with hash -2138426952, now seen corresponding path program 1 times [2021-05-02 20:04:11,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:11,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044671147] [2021-05-02 20:04:11,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:11,200 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:11,200 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [355458496] [2021-05-02 20:04:11,200 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 20:04:11,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:04:11,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 20:04:11,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:11,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:11,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:11,500 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:04:11,500 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:11,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044671147] [2021-05-02 20:04:11,501 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:11,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355458496] [2021-05-02 20:04:11,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355458496] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:04:11,501 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:04:11,501 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 20:04:11,501 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152486452] [2021-05-02 20:04:11,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 20:04:11,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:11,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 20:04:11,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:04:11,503 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 20:04:11,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:11,610 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2021-05-02 20:04:11,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 20:04:11,610 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-05-02 20:04:11,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:11,611 INFO L225 Difference]: With dead ends: 35 [2021-05-02 20:04:11,611 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 20:04:11,612 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 93.3ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:04:11,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 20:04:11,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 20:04:11,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 24 states have internal predecessors, (28), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:04:11,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-02 20:04:11,617 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 19 [2021-05-02 20:04:11,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:11,617 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-02 20:04:11,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 20:04:11,617 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-02 20:04:11,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 20:04:11,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:11,618 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:04:11,821 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 20:04:11,822 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:11,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:11,822 INFO L82 PathProgramCache]: Analyzing trace with hash -554838191, now seen corresponding path program 1 times [2021-05-02 20:04:11,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:11,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013034207] [2021-05-02 20:04:11,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:11,842 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:11,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2064196113] [2021-05-02 20:04:11,842 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 20:04:11,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:04:11,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 20:04:11,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:11,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:11,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:12,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:04:12,018 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:12,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013034207] [2021-05-02 20:04:12,018 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:12,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064196113] [2021-05-02 20:04:12,018 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064196113] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:04:12,019 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:04:12,019 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 20:04:12,019 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89442362] [2021-05-02 20:04:12,019 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 20:04:12,019 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:12,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 20:04:12,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:04:12,020 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 20:04:12,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:12,118 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2021-05-02 20:04:12,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 20:04:12,118 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2021-05-02 20:04:12,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:12,119 INFO L225 Difference]: With dead ends: 43 [2021-05-02 20:04:12,120 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 20:04:12,120 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 48.1ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:04:12,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 20:04:12,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 20:04:12,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.206896551724138) internal successors, (35), 30 states have internal predecessors, (35), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:04:12,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-05-02 20:04:12,124 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 21 [2021-05-02 20:04:12,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:12,124 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-05-02 20:04:12,124 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 20:04:12,124 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-05-02 20:04:12,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 20:04:12,125 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:12,125 INFO L523 BasicCegarLoop]: trace histogram [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 20:04:12,345 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:12,346 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:12,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:12,346 INFO L82 PathProgramCache]: Analyzing trace with hash 1600606598, now seen corresponding path program 1 times [2021-05-02 20:04:12,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:12,347 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016676462] [2021-05-02 20:04:12,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:12,354 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:12,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1721887306] [2021-05-02 20:04:12,355 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 20:04:12,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:04:12,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 20:04:12,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:12,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:04:12,439 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:12,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016676462] [2021-05-02 20:04:12,439 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:12,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1721887306] [2021-05-02 20:04:12,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1721887306] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:04:12,440 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:04:12,440 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 20:04:12,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80126346] [2021-05-02 20:04:12,440 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 20:04:12,440 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:12,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 20:04:12,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:04:12,441 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:04:12,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:12,452 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-02 20:04:12,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 20:04:12,454 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-05-02 20:04:12,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:12,455 INFO L225 Difference]: With dead ends: 42 [2021-05-02 20:04:12,455 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 20:04:12,455 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:04:12,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 20:04:12,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 20:04:12,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 25 states have internal predecessors, (29), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:04:12,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-05-02 20:04:12,458 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 27 [2021-05-02 20:04:12,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:12,459 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-05-02 20:04:12,459 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:04:12,459 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-05-02 20:04:12,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 20:04:12,459 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:12,459 INFO L523 BasicCegarLoop]: trace histogram [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 20:04:12,662 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:12,662 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:12,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:12,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1664896543, now seen corresponding path program 1 times [2021-05-02 20:04:12,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:12,663 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102103191] [2021-05-02 20:04:12,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:12,671 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:12,671 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1857510094] [2021-05-02 20:04:12,671 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 20:04:12,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:04:12,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 20:04:12,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:12,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:12,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:12,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:12,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:12,879 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:04:12,879 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:12,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102103191] [2021-05-02 20:04:12,880 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:12,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857510094] [2021-05-02 20:04:12,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857510094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:04:12,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:04:12,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:04:12,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673278573] [2021-05-02 20:04:12,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:04:12,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:12,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:04:12,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:04:12,881 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:04:13,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:13,019 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2021-05-02 20:04:13,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:04:13,019 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 20:04:13,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:13,020 INFO L225 Difference]: With dead ends: 56 [2021-05-02 20:04:13,020 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 20:04:13,020 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 64.0ms TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-02 20:04:13,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 20:04:13,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-02 20:04:13,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 20:04:13,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2021-05-02 20:04:13,025 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 29 [2021-05-02 20:04:13,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:13,026 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2021-05-02 20:04:13,026 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:04:13,026 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2021-05-02 20:04:13,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 20:04:13,027 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:13,027 INFO L523 BasicCegarLoop]: trace histogram [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 20:04:13,229 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:13,229 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:13,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:13,230 INFO L82 PathProgramCache]: Analyzing trace with hash -976975752, now seen corresponding path program 2 times [2021-05-02 20:04:13,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:13,230 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156045641] [2021-05-02 20:04:13,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:13,238 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:13,238 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1337346953] [2021-05-02 20:04:13,238 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:13,306 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:04:13,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:04:13,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 20:04:13,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:13,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:13,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:13,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:13,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:13,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:13,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:13,476 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:04:13,476 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:13,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156045641] [2021-05-02 20:04:13,476 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:13,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337346953] [2021-05-02 20:04:13,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337346953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:04:13,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:04:13,477 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 20:04:13,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359467863] [2021-05-02 20:04:13,477 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 20:04:13,477 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:13,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 20:04:13,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-05-02 20:04:13,478 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:04:13,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:13,716 INFO L93 Difference]: Finished difference Result 83 states and 98 transitions. [2021-05-02 20:04:13,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 20:04:13,717 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 31 [2021-05-02 20:04:13,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:13,719 INFO L225 Difference]: With dead ends: 83 [2021-05-02 20:04:13,719 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 20:04:13,720 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 128.9ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-02 20:04:13,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 20:04:13,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 54. [2021-05-02 20:04:13,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 39 states have (on average 1.205128205128205) internal successors, (47), 40 states have internal predecessors, (47), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:04:13,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2021-05-02 20:04:13,725 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 31 [2021-05-02 20:04:13,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:13,725 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2021-05-02 20:04:13,725 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:04:13,725 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2021-05-02 20:04:13,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 20:04:13,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:13,726 INFO L523 BasicCegarLoop]: trace histogram [4, 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 20:04:13,928 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 20:04:13,929 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:13,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:13,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1490579311, now seen corresponding path program 3 times [2021-05-02 20:04:13,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:13,930 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099994622] [2021-05-02 20:04:13,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:13,940 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:13,940 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1740555935] [2021-05-02 20:04:13,940 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:14,014 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 20:04:14,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:04:14,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 20:04:14,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:14,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,179 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 20:04:14,179 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:14,179 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099994622] [2021-05-02 20:04:14,179 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:14,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740555935] [2021-05-02 20:04:14,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740555935] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:04:14,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:04:14,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 20:04:14,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566826795] [2021-05-02 20:04:14,182 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 20:04:14,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:14,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 20:04:14,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:04:14,183 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:04:14,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:14,298 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2021-05-02 20:04:14,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:04:14,298 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 33 [2021-05-02 20:04:14,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:14,300 INFO L225 Difference]: With dead ends: 62 [2021-05-02 20:04:14,300 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 20:04:14,300 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 80.9ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-02 20:04:14,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 20:04:14,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 42. [2021-05-02 20:04:14,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 30 states have internal predecessors, (34), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:04:14,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-05-02 20:04:14,311 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 33 [2021-05-02 20:04:14,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:14,311 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-05-02 20:04:14,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:04:14,312 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-05-02 20:04:14,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 20:04:14,312 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:14,312 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:04:14,525 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:14,526 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:14,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:14,526 INFO L82 PathProgramCache]: Analyzing trace with hash -1815734547, now seen corresponding path program 4 times [2021-05-02 20:04:14,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:14,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292993901] [2021-05-02 20:04:14,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:14,534 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:14,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1675444877] [2021-05-02 20:04:14,534 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 20:04:14,589 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 20:04:14,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:04:14,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 20:04:14,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:14,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:14,895 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 20:04:14,895 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:14,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292993901] [2021-05-02 20:04:14,895 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:14,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675444877] [2021-05-02 20:04:14,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1675444877] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:04:14,896 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:04:14,896 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:04:14,896 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270186388] [2021-05-02 20:04:14,896 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:04:14,896 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:14,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:04:14,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:04:14,897 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:04:14,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:14,999 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2021-05-02 20:04:14,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 20:04:14,999 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 37 [2021-05-02 20:04:15,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:15,000 INFO L225 Difference]: With dead ends: 51 [2021-05-02 20:04:15,000 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 20:04:15,000 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 203.8ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 20:04:15,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 20:04:15,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 20:04:15,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 32 states have internal predecessors, (36), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:04:15,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-05-02 20:04:15,004 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 37 [2021-05-02 20:04:15,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:15,004 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-05-02 20:04:15,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:04:15,004 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-05-02 20:04:15,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 20:04:15,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:15,005 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:04:15,213 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:15,213 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:15,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:15,214 INFO L82 PathProgramCache]: Analyzing trace with hash -79763386, now seen corresponding path program 5 times [2021-05-02 20:04:15,214 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:15,214 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812472568] [2021-05-02 20:04:15,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:15,223 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:15,223 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1266409311] [2021-05-02 20:04:15,224 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:15,416 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 20:04:15,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:04:15,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 20:04:15,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:15,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:15,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:15,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:15,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:15,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:15,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:15,652 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 20:04:15,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:15,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812472568] [2021-05-02 20:04:15,652 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:15,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266409311] [2021-05-02 20:04:15,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1266409311] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:04:15,652 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:04:15,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 20:04:15,653 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672767131] [2021-05-02 20:04:15,653 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 20:04:15,653 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:15,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 20:04:15,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 20:04:15,653 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:04:15,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:15,853 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2021-05-02 20:04:15,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 20:04:15,854 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 39 [2021-05-02 20:04:15,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:15,855 INFO L225 Difference]: With dead ends: 74 [2021-05-02 20:04:15,855 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 20:04:15,855 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 152.3ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 20:04:15,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 20:04:15,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2021-05-02 20:04:15,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 46 states have internal predecessors, (52), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 20:04:15,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2021-05-02 20:04:15,859 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 39 [2021-05-02 20:04:15,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:15,859 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2021-05-02 20:04:15,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:04:15,859 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2021-05-02 20:04:15,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 20:04:15,860 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:15,860 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:04:16,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 20:04:16,068 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:16,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:16,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1741211487, now seen corresponding path program 6 times [2021-05-02 20:04:16,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:16,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669887201] [2021-05-02 20:04:16,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:16,076 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:16,076 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1979691646] [2021-05-02 20:04:16,076 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:19,536 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 20:04:19,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:04:19,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 20:04:19,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:19,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:19,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:19,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:19,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:19,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:19,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:19,875 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:04:19,876 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:19,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669887201] [2021-05-02 20:04:19,876 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:19,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979691646] [2021-05-02 20:04:19,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979691646] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:04:19,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:04:19,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 20:04:19,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201435246] [2021-05-02 20:04:19,877 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 20:04:19,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:19,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 20:04:19,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:04:19,878 INFO L87 Difference]: Start difference. First operand 62 states and 68 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:04:20,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:20,106 INFO L93 Difference]: Finished difference Result 92 states and 103 transitions. [2021-05-02 20:04:20,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:04:20,107 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 41 [2021-05-02 20:04:20,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:20,108 INFO L225 Difference]: With dead ends: 92 [2021-05-02 20:04:20,108 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 20:04:20,109 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 220.5ms TimeCoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-05-02 20:04:20,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 20:04:20,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 64. [2021-05-02 20:04:20,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 48 states have internal predecessors, (55), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 20:04:20,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2021-05-02 20:04:20,114 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 41 [2021-05-02 20:04:20,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:20,114 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2021-05-02 20:04:20,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:04:20,114 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2021-05-02 20:04:20,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 20:04:20,115 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:20,115 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:04:20,321 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:20,321 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:20,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:20,321 INFO L82 PathProgramCache]: Analyzing trace with hash -648592328, now seen corresponding path program 7 times [2021-05-02 20:04:20,321 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:20,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527549279] [2021-05-02 20:04:20,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:20,329 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:20,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1067121964] [2021-05-02 20:04:20,329 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:20,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:04:20,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 20:04:20,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:20,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:20,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:20,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:20,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:20,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:20,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:20,628 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:04:20,628 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:20,628 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527549279] [2021-05-02 20:04:20,628 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:20,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067121964] [2021-05-02 20:04:20,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067121964] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:04:20,629 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:04:20,629 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 20:04:20,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70629159] [2021-05-02 20:04:20,629 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 20:04:20,629 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:20,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 20:04:20,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2021-05-02 20:04:20,630 INFO L87 Difference]: Start difference. First operand 64 states and 71 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:04:20,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:20,900 INFO L93 Difference]: Finished difference Result 118 states and 148 transitions. [2021-05-02 20:04:20,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 20:04:20,901 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 43 [2021-05-02 20:04:20,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:20,902 INFO L225 Difference]: With dead ends: 118 [2021-05-02 20:04:20,902 INFO L226 Difference]: Without dead ends: 118 [2021-05-02 20:04:20,902 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 150.7ms TimeCoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2021-05-02 20:04:20,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-02 20:04:20,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 72. [2021-05-02 20:04:20,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 53 states have (on average 1.150943396226415) internal successors, (61), 54 states have internal predecessors, (61), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:04:20,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 81 transitions. [2021-05-02 20:04:20,906 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 81 transitions. Word has length 43 [2021-05-02 20:04:20,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:20,906 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 81 transitions. [2021-05-02 20:04:20,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:04:20,907 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 81 transitions. [2021-05-02 20:04:20,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 20:04:20,907 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:20,907 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:04:21,120 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:04:21,121 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:21,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:21,121 INFO L82 PathProgramCache]: Analyzing trace with hash -619963177, now seen corresponding path program 1 times [2021-05-02 20:04:21,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:21,122 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234306032] [2021-05-02 20:04:21,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:21,128 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:21,128 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1616352550] [2021-05-02 20:04:21,128 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 20:04:21,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:04:21,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 20:04:21,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:21,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:21,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:21,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:21,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:21,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:21,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:21,472 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:04:21,473 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:21,473 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234306032] [2021-05-02 20:04:21,473 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:21,473 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616352550] [2021-05-02 20:04:21,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1616352550] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:04:21,473 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:04:21,473 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 20:04:21,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701436146] [2021-05-02 20:04:21,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 20:04:21,473 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:21,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 20:04:21,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:04:21,474 INFO L87 Difference]: Start difference. First operand 72 states and 81 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:04:21,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:21,677 INFO L93 Difference]: Finished difference Result 84 states and 91 transitions. [2021-05-02 20:04:21,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:04:21,677 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 43 [2021-05-02 20:04:21,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:21,680 INFO L225 Difference]: With dead ends: 84 [2021-05-02 20:04:21,680 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 20:04:21,680 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 150.5ms TimeCoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 20:04:21,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 20:04:21,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 72. [2021-05-02 20:04:21,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 54 states have internal predecessors, (59), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 20:04:21,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2021-05-02 20:04:21,683 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 43 [2021-05-02 20:04:21,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:21,687 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2021-05-02 20:04:21,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:04:21,687 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2021-05-02 20:04:21,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 20:04:21,688 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:21,688 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:04:21,893 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 20:04:21,893 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:21,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:21,893 INFO L82 PathProgramCache]: Analyzing trace with hash -889480684, now seen corresponding path program 8 times [2021-05-02 20:04:21,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:21,894 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314331481] [2021-05-02 20:04:21,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:21,899 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:21,899 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [646872520] [2021-05-02 20:04:21,900 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 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 20:04:21,998 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:04:21,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:04:21,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 20:04:22,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:04:22,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:22,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:22,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:22,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:22,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:22,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:04:22,164 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 14 proven. 16 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 20:04:22,164 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:04:22,164 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314331481] [2021-05-02 20:04:22,164 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:04:22,164 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [646872520] [2021-05-02 20:04:22,164 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [646872520] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:04:22,164 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:04:22,165 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:04:22,165 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285738845] [2021-05-02 20:04:22,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:04:22,165 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:04:22,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:04:22,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:04:22,167 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:04:22,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:04:22,219 INFO L93 Difference]: Finished difference Result 83 states and 91 transitions. [2021-05-02 20:04:22,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 20:04:22,219 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-05-02 20:04:22,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:04:22,220 INFO L225 Difference]: With dead ends: 83 [2021-05-02 20:04:22,220 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 20:04:22,220 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 59.0ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:04:22,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 20:04:22,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-05-02 20:04:22,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 54 states have internal predecessors, (58), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 20:04:22,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2021-05-02 20:04:22,228 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 47 [2021-05-02 20:04:22,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:04:22,228 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2021-05-02 20:04:22,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:04:22,229 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2021-05-02 20:04:22,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 20:04:22,231 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:04:22,231 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:04:22,432 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 20:04:22,433 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:04:22,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:04:22,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1243262931, now seen corresponding path program 9 times [2021-05-02 20:04:22,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:04:22,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397916821] [2021-05-02 20:04:22,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:04:22,439 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:04:22,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [59069811] [2021-05-02 20:04:22,439 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 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 20:10:43,509 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 20:10:43,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:10:43,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 56 conjunts are in the unsatisfiable core [2021-05-02 20:10:43,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:10:43,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:43,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:43,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:43,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:44,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:44,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:44,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:44,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:44,283 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 20:10:44,283 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:10:44,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397916821] [2021-05-02 20:10:44,283 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:10:44,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59069811] [2021-05-02 20:10:44,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59069811] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:10:44,283 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:10:44,283 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-05-02 20:10:44,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404631974] [2021-05-02 20:10:44,284 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 20:10:44,284 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:10:44,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 20:10:44,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2021-05-02 20:10:44,284 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:10:44,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:10:44,656 INFO L93 Difference]: Finished difference Result 95 states and 104 transitions. [2021-05-02 20:10:44,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 20:10:44,657 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 49 [2021-05-02 20:10:44,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:10:44,657 INFO L225 Difference]: With dead ends: 95 [2021-05-02 20:10:44,657 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 20:10:44,658 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 522.6ms TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-05-02 20:10:44,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 20:10:44,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 82. [2021-05-02 20:10:44,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 60 states have (on average 1.1) internal successors, (66), 62 states have internal predecessors, (66), 12 states have call successors, (12), 10 states have call predecessors, (12), 9 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 20:10:44,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2021-05-02 20:10:44,660 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 49 [2021-05-02 20:10:44,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:10:44,661 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2021-05-02 20:10:44,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:10:44,661 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2021-05-02 20:10:44,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 20:10:44,661 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:10:44,661 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:10:44,862 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 20:10:44,862 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:10:44,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:10:44,862 INFO L82 PathProgramCache]: Analyzing trace with hash -1748821556, now seen corresponding path program 2 times [2021-05-02 20:10:44,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:10:44,863 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460559495] [2021-05-02 20:10:44,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:10:44,868 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:10:44,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1397384231] [2021-05-02 20:10:44,868 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 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 20:10:45,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:10:45,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:10:45,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 20:10:45,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:10:45,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:45,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:45,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:45,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:45,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:45,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:45,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:45,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:10:45,517 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 5 proven. 37 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 20:10:45,517 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:10:45,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460559495] [2021-05-02 20:10:45,518 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:10:45,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397384231] [2021-05-02 20:10:45,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397384231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:10:45,518 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:10:45,518 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-05-02 20:10:45,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188214798] [2021-05-02 20:10:45,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 20:10:45,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:10:45,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 20:10:45,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2021-05-02 20:10:45,519 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:10:45,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:10:45,887 INFO L93 Difference]: Finished difference Result 100 states and 109 transitions. [2021-05-02 20:10:45,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 20:10:45,887 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 49 [2021-05-02 20:10:45,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:10:45,888 INFO L225 Difference]: With dead ends: 100 [2021-05-02 20:10:45,888 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 20:10:45,888 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 309.7ms TimeCoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-05-02 20:10:45,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 20:10:45,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 80. [2021-05-02 20:10:45,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 60 states have internal predecessors, (65), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:10:45,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 85 transitions. [2021-05-02 20:10:45,890 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 85 transitions. Word has length 49 [2021-05-02 20:10:45,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:10:45,890 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 85 transitions. [2021-05-02 20:10:45,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:10:45,891 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 85 transitions. [2021-05-02 20:10:45,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 20:10:45,891 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:10:45,891 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:10:46,095 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:10:46,095 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:10:46,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:10:46,095 INFO L82 PathProgramCache]: Analyzing trace with hash 1863822757, now seen corresponding path program 3 times [2021-05-02 20:10:46,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:10:46,096 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633948862] [2021-05-02 20:10:46,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:10:46,110 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:10:46,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1648977053] [2021-05-02 20:10:46,110 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 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 20:11:09,872 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 20:11:09,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:11:09,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 20:11:09,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:11:10,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:10,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:10,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:10,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:10,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:10,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:10,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:10,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:10,425 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 6 proven. 38 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 20:11:10,426 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:11:10,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633948862] [2021-05-02 20:11:10,426 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:11:10,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648977053] [2021-05-02 20:11:10,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1648977053] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:11:10,426 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:11:10,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 20:11:10,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389703360] [2021-05-02 20:11:10,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 20:11:10,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:11:10,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 20:11:10,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2021-05-02 20:11:10,427 INFO L87 Difference]: Start difference. First operand 80 states and 85 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:11:10,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:11:10,758 INFO L93 Difference]: Finished difference Result 100 states and 109 transitions. [2021-05-02 20:11:10,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 20:11:10,758 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 51 [2021-05-02 20:11:10,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:11:10,759 INFO L225 Difference]: With dead ends: 100 [2021-05-02 20:11:10,759 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 20:11:10,760 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 337.3ms TimeCoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2021-05-02 20:11:10,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 20:11:10,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 80. [2021-05-02 20:11:10,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 60 states have internal predecessors, (65), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:11:10,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 85 transitions. [2021-05-02 20:11:10,762 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 85 transitions. Word has length 51 [2021-05-02 20:11:10,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:11:10,763 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 85 transitions. [2021-05-02 20:11:10,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:11:10,763 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 85 transitions. [2021-05-02 20:11:10,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 20:11:10,763 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:11:10,763 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:11:10,973 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 20:11:10,973 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:11:10,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:11:10,973 INFO L82 PathProgramCache]: Analyzing trace with hash -771020037, now seen corresponding path program 10 times [2021-05-02 20:11:10,974 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:11:10,974 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608680528] [2021-05-02 20:11:10,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:11:10,979 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:11:10,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [253029919] [2021-05-02 20:11:10,980 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 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 20:11:11,286 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 20:11:11,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:11:11,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 20:11:11,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:11:11,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:11,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:11,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:11,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:11,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:11,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:11,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:11,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:11,571 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 19 proven. 33 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 20:11:11,571 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:11:11,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608680528] [2021-05-02 20:11:11,571 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:11:11,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253029919] [2021-05-02 20:11:11,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253029919] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:11:11,572 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:11:11,572 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:11:11,572 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643514590] [2021-05-02 20:11:11,572 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:11:11,572 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:11:11,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:11:11,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:11:11,573 INFO L87 Difference]: Start difference. First operand 80 states and 85 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:11:11,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:11:11,651 INFO L93 Difference]: Finished difference Result 87 states and 94 transitions. [2021-05-02 20:11:11,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:11:11,651 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 57 [2021-05-02 20:11:11,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:11:11,652 INFO L225 Difference]: With dead ends: 87 [2021-05-02 20:11:11,652 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 20:11:11,652 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 163.0ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:11:11,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 20:11:11,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-02 20:11:11,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 20:11:11,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2021-05-02 20:11:11,654 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 57 [2021-05-02 20:11:11,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:11:11,654 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2021-05-02 20:11:11,654 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:11:11,654 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2021-05-02 20:11:11,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 20:11:11,654 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:11:11,655 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:11:11,855 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 20:11:11,855 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:11:11,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:11:11,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1784377229, now seen corresponding path program 4 times [2021-05-02 20:11:11,856 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:11:11,856 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985196513] [2021-05-02 20:11:11,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:11:11,861 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:11:11,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [823715665] [2021-05-02 20:11:11,861 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 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 20:11:12,179 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 20:11:12,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:11:12,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 20:11:12,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:11:12,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:12,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:12,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:12,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:12,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:12,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:12,929 WARN L205 SmtUtils]: Spent 337.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2021-05-02 20:11:13,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:13,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:13,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:13,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:11:13,180 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 16 proven. 44 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 20:11:13,181 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:11:13,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985196513] [2021-05-02 20:11:13,181 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:11:13,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823715665] [2021-05-02 20:11:13,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [823715665] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:11:13,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:11:13,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 20:11:13,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204094019] [2021-05-02 20:11:13,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 20:11:13,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:11:13,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 20:11:13,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=205, Unknown=0, NotChecked=0, Total=240 [2021-05-02 20:11:13,183 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:11:14,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:11:14,166 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2021-05-02 20:11:14,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 20:11:14,167 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 59 [2021-05-02 20:11:14,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:11:14,167 INFO L225 Difference]: With dead ends: 72 [2021-05-02 20:11:14,167 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 20:11:14,168 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 1216.5ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 20:11:14,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 20:11:14,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2021-05-02 20:11:14,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 50 states have (on average 1.06) internal successors, (53), 51 states have internal predecessors, (53), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 20:11:14,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 71 transitions. [2021-05-02 20:11:14,170 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 71 transitions. Word has length 59 [2021-05-02 20:11:14,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:11:14,170 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 71 transitions. [2021-05-02 20:11:14,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:11:14,171 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 71 transitions. [2021-05-02 20:11:14,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 20:11:14,171 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:11:14,171 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:11:14,374 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 20:11:14,374 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:11:14,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:11:14,375 INFO L82 PathProgramCache]: Analyzing trace with hash -1755748078, now seen corresponding path program 5 times [2021-05-02 20:11:14,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:11:14,375 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497091581] [2021-05-02 20:11:14,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:11:14,396 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:11:14,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1779193985] [2021-05-02 20:11:14,396 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 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 20:12:04,696 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 20:12:04,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:12:04,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 20:12:04,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:12:04,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:04,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:04,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:04,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:05,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:05,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:05,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:05,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:05,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:05,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:05,352 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 10 proven. 59 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 20:12:05,352 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:12:05,352 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497091581] [2021-05-02 20:12:05,353 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:12:05,353 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779193985] [2021-05-02 20:12:05,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779193985] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:12:05,353 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:12:05,353 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-05-02 20:12:05,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538036632] [2021-05-02 20:12:05,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 20:12:05,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:12:05,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 20:12:05,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=296, Unknown=0, NotChecked=0, Total=342 [2021-05-02 20:12:05,354 INFO L87 Difference]: Start difference. First operand 68 states and 71 transitions. Second operand has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 17 states have internal predecessors, (39), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:12:05,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:12:05,795 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2021-05-02 20:12:05,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 20:12:05,796 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 17 states have internal predecessors, (39), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 59 [2021-05-02 20:12:05,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:12:05,797 INFO L225 Difference]: With dead ends: 76 [2021-05-02 20:12:05,797 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 20:12:05,797 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 36 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 499.1ms TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2021-05-02 20:12:05,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 20:12:05,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-02 20:12:05,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 48 states have internal predecessors, (49), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 20:12:05,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2021-05-02 20:12:05,806 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 59 [2021-05-02 20:12:05,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:12:05,806 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2021-05-02 20:12:05,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 17 states have internal predecessors, (39), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 20:12:05,806 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2021-05-02 20:12:05,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 20:12:05,806 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:12:05,806 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:12:06,017 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:12:06,018 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:12:06,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:12:06,018 INFO L82 PathProgramCache]: Analyzing trace with hash 2005031442, now seen corresponding path program 6 times [2021-05-02 20:12:06,018 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:12:06,018 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515629811] [2021-05-02 20:12:06,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:12:06,023 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:12:06,023 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1861642845] [2021-05-02 20:12:06,023 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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