/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/divbin2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:14:13,856 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:14:13,858 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:14:13,875 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 19:14:13,876 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 19:14:13,877 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 19:14:13,877 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 19:14:13,879 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 19:14:13,879 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 19:14:13,880 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 19:14:13,881 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 19:14:13,881 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2021-05-02 19:14:13,895 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 19:14:13,895 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 19:14:13,896 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 19:14:13,897 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:14:13,908 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:14:13,908 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:14:13,910 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:14:13,911 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:14:13,911 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:14:13,911 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:14:13,911 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:14:13,911 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:14:13,912 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:14:13,912 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:14:13,912 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:14:13,912 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:14:13,912 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:14:13,913 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:14:13,913 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:14:13,913 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:14:13,913 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:14:13,913 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:14:13,913 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:14:13,913 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:14:13,913 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:14:13,914 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:14:13,914 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:14:14,168 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:14:14,189 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:14:14,190 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:14:14,191 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:14:14,192 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:14:14,193 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/divbin2.i [2021-05-02 19:14:14,249 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c646d6f4/96dd1aec86fb40699832818a26a86ac7/FLAGd84fd9c53 [2021-05-02 19:14:14,568 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:14:14,568 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/divbin2.i [2021-05-02 19:14:14,573 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c646d6f4/96dd1aec86fb40699832818a26a86ac7/FLAGd84fd9c53 [2021-05-02 19:14:14,971 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c646d6f4/96dd1aec86fb40699832818a26a86ac7 [2021-05-02 19:14:14,973 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:14:14,974 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:14:14,976 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:14:14,976 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:14:14,979 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:14:14,979 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:14:14" (1/1) ... [2021-05-02 19:14:14,980 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2709c11e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:14:14, skipping insertion in model container [2021-05-02 19:14:14,980 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:14:14" (1/1) ... [2021-05-02 19:14:14,984 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:14:14,997 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:14:15,113 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/divbin2.i[959,972] [2021-05-02 19:14:15,120 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:14:15,125 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:14:15,160 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/divbin2.i[959,972] [2021-05-02 19:14:15,172 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:14:15,181 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:14:15,181 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:14:15 WrapperNode [2021-05-02 19:14:15,182 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:14:15,182 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:14:15,182 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:14:15,183 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:14:15,189 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:14:15" (1/1) ... [2021-05-02 19:14:15,189 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:14:15" (1/1) ... [2021-05-02 19:14:15,195 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:14:15" (1/1) ... [2021-05-02 19:14:15,195 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:14:15" (1/1) ... [2021-05-02 19:14:15,207 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:14:15" (1/1) ... [2021-05-02 19:14:15,211 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:14:15" (1/1) ... [2021-05-02 19:14:15,212 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:14:15" (1/1) ... [2021-05-02 19:14:15,213 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:14:15,214 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:14:15,214 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:14:15,214 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:14:15,214 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:14:15" (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 19:14:15,267 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:14:15,267 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:14:15,267 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:14:15,267 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 19:14:15,267 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 19:14:15,268 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:14:15,268 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 19:14:15,268 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:14:15,268 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 19:14:15,268 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 19:14:15,268 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:14:15,268 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:14:15,268 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 19:14:15,269 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 19:14:15,269 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 19:14:15,269 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:14:15,269 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:14:15,269 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:14:15,270 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:14:15,270 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:14:15,271 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:14:15,271 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:14:15,483 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:14:15,483 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 19:14:15,484 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:14:15 BoogieIcfgContainer [2021-05-02 19:14:15,484 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:14:15,485 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:14:15,485 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:14:15,485 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:14:15,487 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:14:15" (1/1) ... [2021-05-02 19:14:15,498 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:14:15 BasicIcfg [2021-05-02 19:14:15,498 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:14:15,499 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:14:15,499 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:14:15,514 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:14:15,514 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:14:14" (1/4) ... [2021-05-02 19:14:15,515 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73e0d54d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:14:15, skipping insertion in model container [2021-05-02 19:14:15,515 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:14:15" (2/4) ... [2021-05-02 19:14:15,515 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73e0d54d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:14:15, skipping insertion in model container [2021-05-02 19:14:15,515 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:14:15" (3/4) ... [2021-05-02 19:14:15,515 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73e0d54d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:14:15, skipping insertion in model container [2021-05-02 19:14:15,515 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:14:15" (4/4) ... [2021-05-02 19:14:15,516 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2.iJordan [2021-05-02 19:14:15,520 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:14:15,522 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:14:15,532 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:14:15,552 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:14:15,552 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:14:15,552 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:14:15,552 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:14:15,552 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:14:15,552 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:14:15,552 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:14:15,552 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:14:15,560 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 15 states have (on average 1.6) internal successors, (24), 16 states have internal predecessors, (24), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 19:14:15,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 19:14:15,564 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:14:15,565 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:14:15,565 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:14:15,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:14:15,581 INFO L82 PathProgramCache]: Analyzing trace with hash -852214585, now seen corresponding path program 1 times [2021-05-02 19:14:15,587 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:14:15,587 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296110566] [2021-05-02 19:14:15,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:14:15,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:14:15,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:14:15,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:14:15,775 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 19:14:15,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:14:15,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296110566] [2021-05-02 19:14:15,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296110566] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:14:15,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:14:15,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 19:14:15,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123967622] [2021-05-02 19:14:15,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:14:15,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:14:15,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:14:15,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:14:15,792 INFO L87 Difference]: Start difference. First operand has 24 states, 15 states have (on average 1.6) internal successors, (24), 16 states have internal predecessors, (24), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:14:15,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:14:15,834 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-05-02 19:14:15,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:14:15,835 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 19:14:15,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:14:15,840 INFO L225 Difference]: With dead ends: 24 [2021-05-02 19:14:15,840 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 19:14:15,841 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 32.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:14:15,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 19:14:15,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 19:14:15,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:14:15,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-05-02 19:14:15,862 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 12 [2021-05-02 19:14:15,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:14:15,865 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-05-02 19:14:15,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:14:15,866 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-05-02 19:14:15,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 19:14:15,866 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:14:15,866 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:14:15,867 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:14:15,867 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:14:15,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:14:15,868 INFO L82 PathProgramCache]: Analyzing trace with hash 1209212451, now seen corresponding path program 1 times [2021-05-02 19:14:15,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:14:15,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347550523] [2021-05-02 19:14:15,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:14:15,893 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:14:15,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1386490106] [2021-05-02 19:14:15,893 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 19:14:15,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:14:15,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 19:14:15,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:14:16,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:16,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:16,052 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 19:14:16,053 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:14:16,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347550523] [2021-05-02 19:14:16,053 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:14:16,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386490106] [2021-05-02 19:14:16,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386490106] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:14:16,053 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:14:16,054 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 19:14:16,054 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338102452] [2021-05-02 19:14:16,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 19:14:16,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:14:16,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 19:14:16,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:14:16,056 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:14:16,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:14:16,116 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2021-05-02 19:14:16,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 19:14:16,117 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 19:14:16,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:14:16,118 INFO L225 Difference]: With dead ends: 29 [2021-05-02 19:14:16,118 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 19:14:16,118 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 30.5ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:14:16,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 19:14:16,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 19:14:16,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 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 19:14:16,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-05-02 19:14:16,122 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 13 [2021-05-02 19:14:16,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:14:16,122 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-05-02 19:14:16,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:14:16,122 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-05-02 19:14:16,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 19:14:16,123 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:14:16,123 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:14:16,323 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 19:14:16,324 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:14:16,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:14:16,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1400683102, now seen corresponding path program 1 times [2021-05-02 19:14:16,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:14:16,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711385409] [2021-05-02 19:14:16,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:14:16,334 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:14:16,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [845952703] [2021-05-02 19:14:16,334 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 19:14:16,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:14:16,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 19:14:16,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:14:16,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:16,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:16,444 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 19:14:16,445 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:14:16,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711385409] [2021-05-02 19:14:16,445 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:14:16,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845952703] [2021-05-02 19:14:16,445 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845952703] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:14:16,445 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:14:16,445 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 19:14:16,445 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938220905] [2021-05-02 19:14:16,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 19:14:16,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:14:16,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 19:14:16,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:14:16,446 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:14:16,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:14:16,495 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-05-02 19:14:16,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 19:14:16,496 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 19:14:16,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:14:16,496 INFO L225 Difference]: With dead ends: 37 [2021-05-02 19:14:16,496 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 19:14:16,497 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 32.5ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:14:16,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 19:14:16,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 19:14:16,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 25 states have (on average 1.24) internal successors, (31), 26 states have internal predecessors, (31), 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 19:14:16,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-05-02 19:14:16,500 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 15 [2021-05-02 19:14:16,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:14:16,500 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-05-02 19:14:16,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:14:16,501 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-05-02 19:14:16,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 19:14:16,501 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:14:16,501 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:14:16,721 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:14:16,721 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:14:16,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:14:16,722 INFO L82 PathProgramCache]: Analyzing trace with hash -1801492333, now seen corresponding path program 1 times [2021-05-02 19:14:16,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:14:16,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916960160] [2021-05-02 19:14:16,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:14:16,728 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:14:16,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [446506351] [2021-05-02 19:14:16,729 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 19:14:16,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:14:16,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:14:16,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:14:16,794 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 19:14:16,794 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:14:16,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916960160] [2021-05-02 19:14:16,794 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:14:16,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446506351] [2021-05-02 19:14:16,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446506351] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:14:16,795 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:14:16,795 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 19:14:16,795 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738739370] [2021-05-02 19:14:16,795 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:14:16,795 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:14:16,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:14:16,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:14:16,796 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:14:16,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:14:16,804 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2021-05-02 19:14:16,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:14:16,805 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-05-02 19:14:16,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:14:16,805 INFO L225 Difference]: With dead ends: 36 [2021-05-02 19:14:16,805 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 19:14:16,806 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:14:16,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 19:14:16,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 19:14:16,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 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 19:14:16,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-05-02 19:14:16,808 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2021-05-02 19:14:16,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:14:16,808 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-05-02 19:14:16,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:14:16,809 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-05-02 19:14:16,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 19:14:16,809 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:14:16,809 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:14:17,023 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:14:17,026 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:14:17,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:14:17,026 INFO L82 PathProgramCache]: Analyzing trace with hash 108173774, now seen corresponding path program 1 times [2021-05-02 19:14:17,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:14:17,027 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997573301] [2021-05-02 19:14:17,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:14:17,034 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:14:17,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1872422896] [2021-05-02 19:14:17,034 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 19:14:17,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:14:17,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 19:14:17,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:14:17,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:17,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:17,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:17,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:17,194 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:14:17,194 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:14:17,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997573301] [2021-05-02 19:14:17,194 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:14:17,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872422896] [2021-05-02 19:14:17,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872422896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:14:17,195 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:14:17,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 19:14:17,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190597580] [2021-05-02 19:14:17,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 19:14:17,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:14:17,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 19:14:17,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 19:14:17,196 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:14:17,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:14:17,305 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2021-05-02 19:14:17,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 19:14:17,308 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2021-05-02 19:14:17,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:14:17,309 INFO L225 Difference]: With dead ends: 50 [2021-05-02 19:14:17,309 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 19:14:17,309 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 81.4ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 19:14:17,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 19:14:17,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-05-02 19:14:17,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 36 states have internal predecessors, (41), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 19:14:17,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2021-05-02 19:14:17,314 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 23 [2021-05-02 19:14:17,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:14:17,315 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2021-05-02 19:14:17,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:14:17,315 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2021-05-02 19:14:17,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 19:14:17,316 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:14:17,316 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:14:17,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:14:17,532 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:14:17,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:14:17,533 INFO L82 PathProgramCache]: Analyzing trace with hash 1346267209, now seen corresponding path program 2 times [2021-05-02 19:14:17,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:14:17,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437390670] [2021-05-02 19:14:17,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:14:17,542 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:14:17,542 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2006617147] [2021-05-02 19:14:17,543 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 19:14:17,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:14:17,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:14:17,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 19:14:17,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:14:17,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:17,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:17,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:17,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:17,790 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 19:14:17,790 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:14:17,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437390670] [2021-05-02 19:14:17,790 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:14:17,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2006617147] [2021-05-02 19:14:17,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2006617147] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:14:17,791 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:14:17,791 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 19:14:17,791 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839757606] [2021-05-02 19:14:17,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 19:14:17,791 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:14:17,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 19:14:17,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:14:17,792 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:14:17,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:14:17,968 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2021-05-02 19:14:17,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 19:14:17,969 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-05-02 19:14:17,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:14:17,972 INFO L225 Difference]: With dead ends: 68 [2021-05-02 19:14:17,972 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 19:14:17,974 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 135.1ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:14:17,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 19:14:17,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 58. [2021-05-02 19:14:17,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 44 states have internal predecessors, (50), 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 19:14:17,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-02 19:14:17,983 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 25 [2021-05-02 19:14:17,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:14:17,983 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-02 19:14:17,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 states have internal predecessors, (19), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:14:17,983 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-02 19:14:17,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 19:14:17,984 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:14:17,984 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:14:18,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 19:14:18,201 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:14:18,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:14:18,201 INFO L82 PathProgramCache]: Analyzing trace with hash 1448117252, now seen corresponding path program 3 times [2021-05-02 19:14:18,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:14:18,202 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964103014] [2021-05-02 19:14:18,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:14:18,209 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:14:18,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [126724302] [2021-05-02 19:14:18,209 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 19:14:18,279 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 19:14:18,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:14:18,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 19:14:18,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:14:18,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:18,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:18,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:18,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:18,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:18,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:18,444 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 19:14:18,445 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:14:18,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964103014] [2021-05-02 19:14:18,445 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:14:18,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126724302] [2021-05-02 19:14:18,445 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126724302] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:14:18,445 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:14:18,445 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 19:14:18,445 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988378776] [2021-05-02 19:14:18,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:14:18,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:14:18,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:14:18,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:14:18,446 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:14:18,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:14:18,585 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2021-05-02 19:14:18,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 19:14:18,585 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-05-02 19:14:18,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:14:18,586 INFO L225 Difference]: With dead ends: 70 [2021-05-02 19:14:18,586 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 19:14:18,586 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 94.9ms TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-05-02 19:14:18,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 19:14:18,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 58. [2021-05-02 19:14:18,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 44 states have internal predecessors, (50), 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 19:14:18,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-02 19:14:18,590 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 27 [2021-05-02 19:14:18,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:14:18,590 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-02 19:14:18,590 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:14:18,590 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-02 19:14:18,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 19:14:18,591 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:14:18,591 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:14:18,797 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:14:18,797 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:14:18,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:14:18,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1862928702, now seen corresponding path program 4 times [2021-05-02 19:14:18,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:14:18,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285009541] [2021-05-02 19:14:18,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:14:18,804 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:14:18,804 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [613364291] [2021-05-02 19:14:18,804 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 19:14:18,851 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:14:18,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:14:18,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 19:14:18,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:14:18,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:18,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:18,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:18,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:18,961 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:14:18,961 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:14:18,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285009541] [2021-05-02 19:14:18,961 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:14:18,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613364291] [2021-05-02 19:14:18,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613364291] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:14:18,962 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:14:18,962 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 19:14:18,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932580012] [2021-05-02 19:14:18,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 19:14:18,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:14:18,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 19:14:18,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:14:18,963 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:14:18,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:14:18,990 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2021-05-02 19:14:18,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 19:14:18,991 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 31 [2021-05-02 19:14:18,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:14:18,992 INFO L225 Difference]: With dead ends: 63 [2021-05-02 19:14:18,992 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 19:14:18,992 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 34.6ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:14:18,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 19:14:18,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 19:14:18,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 39 states have internal predecessors, (45), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 19:14:18,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2021-05-02 19:14:18,998 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 31 [2021-05-02 19:14:18,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:14:18,999 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2021-05-02 19:14:18,999 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:14:18,999 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2021-05-02 19:14:19,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 19:14:19,000 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:14:19,001 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:14:19,220 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:14:19,220 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:14:19,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:14:19,221 INFO L82 PathProgramCache]: Analyzing trace with hash 201927865, now seen corresponding path program 5 times [2021-05-02 19:14:19,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:14:19,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745399418] [2021-05-02 19:14:19,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:14:19,227 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:14:19,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1705642304] [2021-05-02 19:14:19,227 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 19:14:20,315 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 19:14:20,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:14:20,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 19:14:20,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:14:20,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:20,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:20,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:20,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:20,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:20,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:14:20,510 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:14:20,510 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:14:20,510 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745399418] [2021-05-02 19:14:20,511 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:14:20,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705642304] [2021-05-02 19:14:20,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705642304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:14:20,511 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:14:20,511 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 19:14:20,511 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179014112] [2021-05-02 19:14:20,511 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 19:14:20,511 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:14:20,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 19:14:20,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:14:20,512 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:14:20,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:14:20,673 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2021-05-02 19:14:20,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 19:14:20,673 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 33 [2021-05-02 19:14:20,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:14:20,674 INFO L225 Difference]: With dead ends: 68 [2021-05-02 19:14:20,674 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 19:14:20,674 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 135.1ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:14:20,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 19:14:20,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 56. [2021-05-02 19:14:20,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 41 states have (on average 1.170731707317073) internal successors, (48), 42 states have internal predecessors, (48), 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 19:14:20,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2021-05-02 19:14:20,677 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 33 [2021-05-02 19:14:20,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:14:20,677 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2021-05-02 19:14:20,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 13 states have internal predecessors, (22), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:14:20,678 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2021-05-02 19:14:20,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 19:14:20,678 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:14:20,678 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:14:20,883 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 19:14:20,883 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:14:20,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:14:20,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1707957620, now seen corresponding path program 6 times [2021-05-02 19:14:20,884 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:14:20,884 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974247413] [2021-05-02 19:14:20,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:14:20,890 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:14:20,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1457496230] [2021-05-02 19:14:20,890 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