./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound50.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 870f3f117c59e986b23526e49a2d44ed8c8e543941d3d310e77e3939c7927e70 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 12:50:17,832 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 12:50:17,834 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 12:50:17,886 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 12:50:17,886 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 12:50:17,887 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 12:50:17,888 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 12:50:17,889 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 12:50:17,890 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 12:50:17,890 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 12:50:17,891 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 12:50:17,892 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 12:50:17,892 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 12:50:17,893 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 12:50:17,893 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 12:50:17,894 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 12:50:17,895 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 12:50:17,895 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 12:50:17,896 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 12:50:17,897 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 12:50:17,898 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 12:50:17,899 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 12:50:17,900 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 12:50:17,900 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 12:50:17,912 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 12:50:17,913 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 12:50:17,913 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 12:50:17,913 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 12:50:17,914 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 12:50:17,914 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 12:50:17,914 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 12:50:17,915 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 12:50:17,915 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 12:50:17,916 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 12:50:17,917 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 12:50:17,917 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 12:50:17,917 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 12:50:17,917 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 12:50:17,917 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 12:50:17,918 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 12:50:17,918 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 12:50:17,919 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 12:50:17,932 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 12:50:17,934 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 12:50:17,934 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 12:50:17,934 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 12:50:17,935 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 12:50:17,935 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 12:50:17,935 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 12:50:17,935 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 12:50:17,936 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 12:50:17,936 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 12:50:17,936 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 12:50:17,936 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 12:50:17,937 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 12:50:17,937 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 12:50:17,937 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 12:50:17,937 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 12:50:17,937 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 12:50:17,937 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 12:50:17,937 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 12:50:17,937 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 12:50:17,938 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 12:50:17,938 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 12:50:17,938 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 12:50:17,938 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 12:50:17,938 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:50:17,938 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 12:50:17,938 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 12:50:17,939 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 12:50:17,939 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 12:50:17,940 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 12:50:17,940 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 12:50:17,940 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 12:50:17,940 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 12:50:17,940 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 12:50:17,940 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 870f3f117c59e986b23526e49a2d44ed8c8e543941d3d310e77e3939c7927e70 [2021-12-21 12:50:18,145 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 12:50:18,170 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 12:50:18,172 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 12:50:18,173 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 12:50:18,173 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 12:50:18,174 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound50.c [2021-12-21 12:50:18,244 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6271a48dd/71fa76ea2eb244f5b94dc945ca509375/FLAG4392e7e73 [2021-12-21 12:50:18,557 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 12:50:18,557 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound50.c [2021-12-21 12:50:18,565 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6271a48dd/71fa76ea2eb244f5b94dc945ca509375/FLAG4392e7e73 [2021-12-21 12:50:18,983 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6271a48dd/71fa76ea2eb244f5b94dc945ca509375 [2021-12-21 12:50:18,985 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 12:50:18,986 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 12:50:18,988 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 12:50:18,988 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 12:50:18,990 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 12:50:18,991 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:50:18" (1/1) ... [2021-12-21 12:50:18,992 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15eaddf1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:18, skipping insertion in model container [2021-12-21 12:50:18,992 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:50:18" (1/1) ... [2021-12-21 12:50:18,996 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 12:50:19,008 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 12:50:19,145 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound50.c[458,471] [2021-12-21 12:50:19,161 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:50:19,167 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 12:50:19,177 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound50.c[458,471] [2021-12-21 12:50:19,191 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:50:19,201 INFO L208 MainTranslator]: Completed translation [2021-12-21 12:50:19,201 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19 WrapperNode [2021-12-21 12:50:19,202 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 12:50:19,203 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 12:50:19,203 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 12:50:19,203 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 12:50:19,207 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19" (1/1) ... [2021-12-21 12:50:19,212 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19" (1/1) ... [2021-12-21 12:50:19,224 INFO L137 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 39 [2021-12-21 12:50:19,225 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 12:50:19,225 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 12:50:19,225 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 12:50:19,226 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 12:50:19,231 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19" (1/1) ... [2021-12-21 12:50:19,231 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19" (1/1) ... [2021-12-21 12:50:19,237 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19" (1/1) ... [2021-12-21 12:50:19,238 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19" (1/1) ... [2021-12-21 12:50:19,245 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19" (1/1) ... [2021-12-21 12:50:19,249 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19" (1/1) ... [2021-12-21 12:50:19,250 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19" (1/1) ... [2021-12-21 12:50:19,253 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 12:50:19,254 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 12:50:19,255 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 12:50:19,255 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 12:50:19,255 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19" (1/1) ... [2021-12-21 12:50:19,260 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:50:19,267 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:19,309 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-21 12:50:19,369 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-21 12:50:19,399 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 12:50:19,399 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 12:50:19,399 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 12:50:19,399 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 12:50:19,399 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-21 12:50:19,399 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-21 12:50:19,440 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 12:50:19,441 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 12:50:19,537 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 12:50:19,541 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 12:50:19,541 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-21 12:50:19,543 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:50:19 BoogieIcfgContainer [2021-12-21 12:50:19,543 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 12:50:19,544 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 12:50:19,544 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 12:50:19,554 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 12:50:19,555 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 12:50:18" (1/3) ... [2021-12-21 12:50:19,555 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@358384ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:50:19, skipping insertion in model container [2021-12-21 12:50:19,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:50:19" (2/3) ... [2021-12-21 12:50:19,556 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@358384ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:50:19, skipping insertion in model container [2021-12-21 12:50:19,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:50:19" (3/3) ... [2021-12-21 12:50:19,557 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll_unwindbound50.c [2021-12-21 12:50:19,560 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 12:50:19,561 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 12:50:19,594 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 12:50:19,598 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-21 12:50:19,599 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 12:50:19,608 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:50:19,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-12-21 12:50:19,611 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:19,611 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:19,612 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:19,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:19,615 INFO L85 PathProgramCache]: Analyzing trace with hash 1819788390, now seen corresponding path program 1 times [2021-12-21 12:50:19,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:19,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007972051] [2021-12-21 12:50:19,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:19,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:19,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:19,730 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:50:19,731 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:19,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007972051] [2021-12-21 12:50:19,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2007972051] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:50:19,732 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:50:19,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 12:50:19,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142706959] [2021-12-21 12:50:19,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:50:19,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-21 12:50:19,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:19,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-21 12:50:19,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-21 12:50:19,780 INFO L87 Difference]: Start difference. First operand has 18 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:50:19,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:19,807 INFO L93 Difference]: Finished difference Result 34 states and 47 transitions. [2021-12-21 12:50:19,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-21 12:50:19,809 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-12-21 12:50:19,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:19,813 INFO L225 Difference]: With dead ends: 34 [2021-12-21 12:50:19,814 INFO L226 Difference]: Without dead ends: 14 [2021-12-21 12:50:19,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-21 12:50:19,818 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:19,821 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:19,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-12-21 12:50:19,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-12-21 12:50:19,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:50:19,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2021-12-21 12:50:19,859 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 7 [2021-12-21 12:50:19,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:19,860 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2021-12-21 12:50:19,860 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:50:19,860 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2021-12-21 12:50:19,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-21 12:50:19,861 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:19,861 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:19,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 12:50:19,862 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:19,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:19,863 INFO L85 PathProgramCache]: Analyzing trace with hash 178441499, now seen corresponding path program 1 times [2021-12-21 12:50:19,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:19,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58209207] [2021-12-21 12:50:19,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:19,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:19,881 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:19,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2138035855] [2021-12-21 12:50:19,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:19,882 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:19,882 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:19,884 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:19,884 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 12:50:19,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:19,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-21 12:50:19,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:19,957 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:50:19,957 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 12:50:19,957 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:19,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58209207] [2021-12-21 12:50:19,958 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:19,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138035855] [2021-12-21 12:50:19,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138035855] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:50:19,959 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:50:19,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 12:50:19,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833326658] [2021-12-21 12:50:19,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:50:19,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 12:50:19,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:19,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 12:50:19,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 12:50:19,961 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:50:19,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:19,971 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-12-21 12:50:19,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 12:50:19,972 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-12-21 12:50:19,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:19,972 INFO L225 Difference]: With dead ends: 24 [2021-12-21 12:50:19,972 INFO L226 Difference]: Without dead ends: 16 [2021-12-21 12:50:19,973 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 12:50:19,974 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 0 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:19,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 41 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:19,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-12-21 12:50:19,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-12-21 12:50:19,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:50:19,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-12-21 12:50:19,978 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 8 [2021-12-21 12:50:19,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:19,978 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-12-21 12:50:19,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:50:19,978 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-12-21 12:50:19,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-21 12:50:19,979 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:19,979 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:19,995 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:20,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:20,196 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:20,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:20,196 INFO L85 PathProgramCache]: Analyzing trace with hash 180228959, now seen corresponding path program 1 times [2021-12-21 12:50:20,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:20,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15948688] [2021-12-21 12:50:20,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:20,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:20,204 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:20,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1294368091] [2021-12-21 12:50:20,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:20,211 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:20,211 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:20,212 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:20,214 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 12:50:20,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:20,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-21 12:50:20,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:20,289 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:50:20,290 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 12:50:20,290 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:20,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15948688] [2021-12-21 12:50:20,290 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:20,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294368091] [2021-12-21 12:50:20,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294368091] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:50:20,291 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:50:20,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 12:50:20,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742726713] [2021-12-21 12:50:20,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:50:20,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:50:20,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:20,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:50:20,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 12:50:20,293 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:50:20,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:20,322 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2021-12-21 12:50:20,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 12:50:20,323 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-12-21 12:50:20,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:20,323 INFO L225 Difference]: With dead ends: 26 [2021-12-21 12:50:20,323 INFO L226 Difference]: Without dead ends: 22 [2021-12-21 12:50:20,324 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-21 12:50:20,325 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 6 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:20,325 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 55 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:20,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-12-21 12:50:20,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-12-21 12:50:20,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:50:20,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-12-21 12:50:20,330 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 8 [2021-12-21 12:50:20,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:20,330 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-12-21 12:50:20,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:50:20,330 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-12-21 12:50:20,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-21 12:50:20,331 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:20,331 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:20,350 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:20,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-12-21 12:50:20,550 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:20,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:20,551 INFO L85 PathProgramCache]: Analyzing trace with hash 823572993, now seen corresponding path program 1 times [2021-12-21 12:50:20,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:20,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504753438] [2021-12-21 12:50:20,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:20,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:20,558 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:20,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [12378671] [2021-12-21 12:50:20,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:20,561 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:20,561 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:20,576 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:20,576 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 12:50:20,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:20,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-21 12:50:20,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:20,670 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:50:20,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:20,736 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:50:20,736 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:20,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504753438] [2021-12-21 12:50:20,736 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:20,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12378671] [2021-12-21 12:50:20,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [12378671] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:50:20,738 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 12:50:20,739 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-12-21 12:50:20,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885935777] [2021-12-21 12:50:20,739 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:20,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-21 12:50:20,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:20,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-21 12:50:20,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-12-21 12:50:20,741 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:50:20,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:20,818 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2021-12-21 12:50:20,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 12:50:20,818 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 16 [2021-12-21 12:50:20,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:20,819 INFO L225 Difference]: With dead ends: 56 [2021-12-21 12:50:20,819 INFO L226 Difference]: Without dead ends: 48 [2021-12-21 12:50:20,820 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-12-21 12:50:20,820 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 27 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:20,821 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 93 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:20,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-12-21 12:50:20,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44. [2021-12-21 12:50:20,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 32 states have internal predecessors, (36), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 12:50:20,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2021-12-21 12:50:20,827 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 16 [2021-12-21 12:50:20,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:20,828 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2021-12-21 12:50:20,828 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:50:20,828 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2021-12-21 12:50:20,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-21 12:50:20,828 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:20,829 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:20,873 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:21,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:21,067 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:21,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:21,068 INFO L85 PathProgramCache]: Analyzing trace with hash 825360453, now seen corresponding path program 1 times [2021-12-21 12:50:21,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:21,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819642609] [2021-12-21 12:50:21,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:21,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:21,076 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:21,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1933740644] [2021-12-21 12:50:21,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:21,076 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:21,076 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:21,077 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:21,078 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 12:50:21,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:21,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-21 12:50:21,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:21,173 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:50:21,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:26,634 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 12:50:26,635 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:26,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819642609] [2021-12-21 12:50:26,635 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:26,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933740644] [2021-12-21 12:50:26,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933740644] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:26,635 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:26,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-12-21 12:50:26,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459744586] [2021-12-21 12:50:26,636 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:50:26,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:50:26,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:26,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:50:26,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=28, Unknown=1, NotChecked=0, Total=42 [2021-12-21 12:50:26,637 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 12:50:26,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:26,673 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2021-12-21 12:50:26,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 12:50:26,673 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-12-21 12:50:26,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:26,674 INFO L225 Difference]: With dead ends: 58 [2021-12-21 12:50:26,674 INFO L226 Difference]: Without dead ends: 47 [2021-12-21 12:50:26,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=17, Invalid=38, Unknown=1, NotChecked=0, Total=56 [2021-12-21 12:50:26,675 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 7 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:26,676 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 43 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:26,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-12-21 12:50:26,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 41. [2021-12-21 12:50:26,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 states have internal predecessors, (35), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 12:50:26,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2021-12-21 12:50:26,681 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 16 [2021-12-21 12:50:26,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:26,681 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2021-12-21 12:50:26,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 12:50:26,682 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2021-12-21 12:50:26,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-21 12:50:26,682 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:26,682 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:26,701 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:26,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:26,899 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:26,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:26,900 INFO L85 PathProgramCache]: Analyzing trace with hash -1696898494, now seen corresponding path program 1 times [2021-12-21 12:50:26,900 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:26,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898276994] [2021-12-21 12:50:26,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:26,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:26,905 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:26,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2073163411] [2021-12-21 12:50:26,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:26,906 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:26,906 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:26,907 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:26,908 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-21 12:50:26,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:26,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 12:50:26,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:27,038 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 12:50:27,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:27,142 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:27,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1898276994] [2021-12-21 12:50:27,142 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:27,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073163411] [2021-12-21 12:50:27,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073163411] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:27,143 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:27,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-12-21 12:50:27,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272042495] [2021-12-21 12:50:27,143 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:27,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 12:50:27,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:27,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 12:50:27,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-12-21 12:50:27,144 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:50:27,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:27,182 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2021-12-21 12:50:27,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-21 12:50:27,183 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2021-12-21 12:50:27,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:27,183 INFO L225 Difference]: With dead ends: 46 [2021-12-21 12:50:27,183 INFO L226 Difference]: Without dead ends: 41 [2021-12-21 12:50:27,184 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-12-21 12:50:27,184 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 2 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:27,185 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 88 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:27,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-12-21 12:50:27,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-12-21 12:50:27,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 12:50:27,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-12-21 12:50:27,190 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 22 [2021-12-21 12:50:27,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:27,190 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-12-21 12:50:27,190 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:50:27,190 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-12-21 12:50:27,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-21 12:50:27,191 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:27,191 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:27,207 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-12-21 12:50:27,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:27,398 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:27,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:27,398 INFO L85 PathProgramCache]: Analyzing trace with hash -47987544, now seen corresponding path program 2 times [2021-12-21 12:50:27,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:27,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574821059] [2021-12-21 12:50:27,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:27,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:27,427 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:27,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [122396661] [2021-12-21 12:50:27,428 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:50:27,431 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:27,431 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:27,432 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:27,433 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-21 12:50:27,480 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:50:27,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:27,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-21 12:50:27,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:27,639 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-21 12:50:27,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:27,829 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:27,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574821059] [2021-12-21 12:50:27,829 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:27,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122396661] [2021-12-21 12:50:27,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122396661] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:27,829 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:27,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-12-21 12:50:27,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118204840] [2021-12-21 12:50:27,829 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:27,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-21 12:50:27,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:27,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-21 12:50:27,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-12-21 12:50:27,830 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:50:27,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:27,891 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2021-12-21 12:50:27,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-21 12:50:27,892 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 30 [2021-12-21 12:50:27,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:27,892 INFO L225 Difference]: With dead ends: 46 [2021-12-21 12:50:27,892 INFO L226 Difference]: Without dead ends: 41 [2021-12-21 12:50:27,893 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-12-21 12:50:27,893 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 2 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:27,893 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 124 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:27,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-12-21 12:50:27,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-12-21 12:50:27,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 12:50:27,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2021-12-21 12:50:27,897 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 30 [2021-12-21 12:50:27,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:27,898 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2021-12-21 12:50:27,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:50:27,898 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2021-12-21 12:50:27,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-12-21 12:50:27,898 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:27,899 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:27,917 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:28,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:28,115 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:28,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:28,115 INFO L85 PathProgramCache]: Analyzing trace with hash -584163058, now seen corresponding path program 3 times [2021-12-21 12:50:28,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:28,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722074615] [2021-12-21 12:50:28,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:28,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:28,121 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:28,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [402805234] [2021-12-21 12:50:28,121 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:50:28,122 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:28,122 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:28,134 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:28,135 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-21 12:50:28,172 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-21 12:50:28,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:28,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 12:50:28,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:28,333 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-21 12:50:28,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:28,464 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:28,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722074615] [2021-12-21 12:50:28,464 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:28,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402805234] [2021-12-21 12:50:28,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402805234] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:28,465 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:28,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-12-21 12:50:28,465 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048492071] [2021-12-21 12:50:28,465 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:28,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-21 12:50:28,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:28,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-21 12:50:28,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-12-21 12:50:28,466 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 9 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 12:50:28,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:28,532 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-12-21 12:50:28,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 12:50:28,532 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 38 [2021-12-21 12:50:28,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:28,533 INFO L225 Difference]: With dead ends: 48 [2021-12-21 12:50:28,533 INFO L226 Difference]: Without dead ends: 43 [2021-12-21 12:50:28,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-12-21 12:50:28,534 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 2 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:28,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 166 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:28,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-12-21 12:50:28,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-12-21 12:50:28,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 12:50:28,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-12-21 12:50:28,539 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 38 [2021-12-21 12:50:28,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:28,539 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-12-21 12:50:28,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 12:50:28,540 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-12-21 12:50:28,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-21 12:50:28,540 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:28,540 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:28,573 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-12-21 12:50:28,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:28,775 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:28,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:28,775 INFO L85 PathProgramCache]: Analyzing trace with hash 2045303987, now seen corresponding path program 2 times [2021-12-21 12:50:28,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:28,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1813276621] [2021-12-21 12:50:28,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:28,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:28,781 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:28,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1683165947] [2021-12-21 12:50:28,781 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:50:28,781 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:28,781 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:28,804 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:28,863 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-21 12:50:28,887 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:50:28,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:28,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-21 12:50:28,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:28,946 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:50:28,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:29,009 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-21 12:50:29,009 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:29,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1813276621] [2021-12-21 12:50:29,009 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:29,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1683165947] [2021-12-21 12:50:29,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1683165947] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:50:29,009 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 12:50:29,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-12-21 12:50:29,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291058356] [2021-12-21 12:50:29,010 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:29,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-21 12:50:29,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:29,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-21 12:50:29,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-12-21 12:50:29,011 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 12:50:29,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:29,122 INFO L93 Difference]: Finished difference Result 119 states and 125 transitions. [2021-12-21 12:50:29,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-21 12:50:29,122 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 40 [2021-12-21 12:50:29,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:29,123 INFO L225 Difference]: With dead ends: 119 [2021-12-21 12:50:29,123 INFO L226 Difference]: Without dead ends: 114 [2021-12-21 12:50:29,124 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2021-12-21 12:50:29,124 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 107 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:29,124 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 119 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:50:29,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-12-21 12:50:29,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 89. [2021-12-21 12:50:29,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 67 states have internal predecessors, (74), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:50:29,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2021-12-21 12:50:29,137 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 40 [2021-12-21 12:50:29,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:29,138 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2021-12-21 12:50:29,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 12:50:29,138 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2021-12-21 12:50:29,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-21 12:50:29,142 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:29,142 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:29,164 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:29,362 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-12-21 12:50:29,363 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:29,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:29,363 INFO L85 PathProgramCache]: Analyzing trace with hash -635357324, now seen corresponding path program 4 times [2021-12-21 12:50:29,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:29,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024168841] [2021-12-21 12:50:29,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:29,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:29,369 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:29,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1693797817] [2021-12-21 12:50:29,369 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:50:29,369 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:29,369 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:29,370 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:29,371 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-21 12:50:29,483 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:50:29,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:29,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:50:29,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:29,687 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-12-21 12:50:29,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:29,857 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:29,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024168841] [2021-12-21 12:50:29,857 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:29,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693797817] [2021-12-21 12:50:29,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693797817] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:29,857 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:29,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-12-21 12:50:29,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423648381] [2021-12-21 12:50:29,857 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:29,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-21 12:50:29,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:29,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-21 12:50:29,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-12-21 12:50:29,858 INFO L87 Difference]: Start difference. First operand 89 states and 95 transitions. Second operand has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 12:50:29,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:29,920 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2021-12-21 12:50:29,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 12:50:29,921 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 46 [2021-12-21 12:50:29,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:29,922 INFO L225 Difference]: With dead ends: 94 [2021-12-21 12:50:29,922 INFO L226 Difference]: Without dead ends: 89 [2021-12-21 12:50:29,922 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-12-21 12:50:29,923 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 2 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:29,923 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 214 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:50:29,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-21 12:50:29,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-12-21 12:50:29,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 67 states have (on average 1.0895522388059702) internal successors, (73), 67 states have internal predecessors, (73), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:50:29,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 94 transitions. [2021-12-21 12:50:29,930 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 94 transitions. Word has length 46 [2021-12-21 12:50:29,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:29,930 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 94 transitions. [2021-12-21 12:50:29,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 12:50:29,930 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 94 transitions. [2021-12-21 12:50:29,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-12-21 12:50:29,942 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:29,942 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:29,959 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:30,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-21 12:50:30,146 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:30,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:30,147 INFO L85 PathProgramCache]: Analyzing trace with hash 220350426, now seen corresponding path program 5 times [2021-12-21 12:50:30,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:30,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067715811] [2021-12-21 12:50:30,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:30,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:30,152 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:30,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [657842840] [2021-12-21 12:50:30,152 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:50:30,152 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:30,152 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:30,184 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:30,187 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-21 12:50:30,356 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-21 12:50:30,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:30,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-21 12:50:30,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:30,563 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-12-21 12:50:30,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:30,706 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:30,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067715811] [2021-12-21 12:50:30,706 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:30,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657842840] [2021-12-21 12:50:30,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657842840] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:30,706 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:30,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-12-21 12:50:30,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891705064] [2021-12-21 12:50:30,706 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:30,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-21 12:50:30,707 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:30,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-21 12:50:30,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-12-21 12:50:30,708 INFO L87 Difference]: Start difference. First operand 89 states and 94 transitions. Second operand has 11 states, 10 states have (on average 2.6) internal successors, (26), 10 states have internal predecessors, (26), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 12:50:30,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:30,802 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2021-12-21 12:50:30,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-21 12:50:30,802 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.6) internal successors, (26), 10 states have internal predecessors, (26), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 54 [2021-12-21 12:50:30,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:30,803 INFO L225 Difference]: With dead ends: 94 [2021-12-21 12:50:30,803 INFO L226 Difference]: Without dead ends: 89 [2021-12-21 12:50:30,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-12-21 12:50:30,804 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 2 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:30,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 268 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:50:30,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-21 12:50:30,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-12-21 12:50:30,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 67 states have (on average 1.0746268656716418) internal successors, (72), 67 states have internal predecessors, (72), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:50:30,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 93 transitions. [2021-12-21 12:50:30,812 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 93 transitions. Word has length 54 [2021-12-21 12:50:30,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:30,812 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 93 transitions. [2021-12-21 12:50:30,813 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.6) internal successors, (26), 10 states have internal predecessors, (26), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 12:50:30,813 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 93 transitions. [2021-12-21 12:50:30,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-12-21 12:50:30,813 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:30,813 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:30,833 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:31,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-21 12:50:31,019 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:31,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:31,019 INFO L85 PathProgramCache]: Analyzing trace with hash 156734016, now seen corresponding path program 6 times [2021-12-21 12:50:31,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:31,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709391886] [2021-12-21 12:50:31,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:31,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:31,025 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:31,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [314196200] [2021-12-21 12:50:31,025 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:50:31,026 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:31,026 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:31,040 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:31,041 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-21 12:50:31,148 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-12-21 12:50:31,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:31,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-21 12:50:31,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:31,350 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 14 proven. 84 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-21 12:50:31,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:31,484 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:31,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709391886] [2021-12-21 12:50:31,484 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:31,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314196200] [2021-12-21 12:50:31,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314196200] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:31,484 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:31,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-12-21 12:50:31,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836153354] [2021-12-21 12:50:31,484 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:31,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-21 12:50:31,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:31,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-21 12:50:31,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-12-21 12:50:31,485 INFO L87 Difference]: Start difference. First operand 89 states and 93 transitions. Second operand has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 12:50:31,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:31,593 INFO L93 Difference]: Finished difference Result 94 states and 97 transitions. [2021-12-21 12:50:31,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-21 12:50:31,593 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 62 [2021-12-21 12:50:31,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:31,594 INFO L225 Difference]: With dead ends: 94 [2021-12-21 12:50:31,594 INFO L226 Difference]: Without dead ends: 89 [2021-12-21 12:50:31,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-12-21 12:50:31,595 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 2 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:31,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 328 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:50:31,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-21 12:50:31,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-12-21 12:50:31,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 67 states have (on average 1.0597014925373134) internal successors, (71), 67 states have internal predecessors, (71), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:50:31,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2021-12-21 12:50:31,602 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 62 [2021-12-21 12:50:31,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:31,603 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2021-12-21 12:50:31,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 12:50:31,603 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2021-12-21 12:50:31,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-12-21 12:50:31,604 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:31,604 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:31,627 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-12-21 12:50:31,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-21 12:50:31,809 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:31,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:31,809 INFO L85 PathProgramCache]: Analyzing trace with hash -605612378, now seen corresponding path program 7 times [2021-12-21 12:50:31,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:31,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108255188] [2021-12-21 12:50:31,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:31,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:31,821 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:31,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [796745837] [2021-12-21 12:50:31,822 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:50:31,822 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:31,822 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:31,823 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:31,824 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-21 12:50:32,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:32,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-21 12:50:32,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:32,472 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 16 proven. 112 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-12-21 12:50:32,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:32,568 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:32,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108255188] [2021-12-21 12:50:32,569 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:32,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796745837] [2021-12-21 12:50:32,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796745837] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:32,569 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:32,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-12-21 12:50:32,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718060843] [2021-12-21 12:50:32,569 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:32,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 12:50:32,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:32,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 12:50:32,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-12-21 12:50:32,570 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand has 13 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 12 states have internal predecessors, (32), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 12:50:32,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:32,691 INFO L93 Difference]: Finished difference Result 94 states and 96 transitions. [2021-12-21 12:50:32,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-21 12:50:32,692 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 12 states have internal predecessors, (32), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 70 [2021-12-21 12:50:32,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:32,692 INFO L225 Difference]: With dead ends: 94 [2021-12-21 12:50:32,692 INFO L226 Difference]: Without dead ends: 89 [2021-12-21 12:50:32,693 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-12-21 12:50:32,693 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 2 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:32,693 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 394 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:50:32,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-21 12:50:32,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-12-21 12:50:32,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:50:32,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2021-12-21 12:50:32,698 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 70 [2021-12-21 12:50:32,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:32,699 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2021-12-21 12:50:32,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 12 states have internal predecessors, (32), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 12:50:32,699 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2021-12-21 12:50:32,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-12-21 12:50:32,700 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:32,700 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:32,706 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-12-21 12:50:32,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-21 12:50:32,905 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:32,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:32,905 INFO L85 PathProgramCache]: Analyzing trace with hash 200725772, now seen corresponding path program 8 times [2021-12-21 12:50:32,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:32,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585426267] [2021-12-21 12:50:32,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:32,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:32,911 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:32,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1086712773] [2021-12-21 12:50:32,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:50:32,911 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:32,912 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:32,912 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:32,913 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-21 12:50:33,281 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:50:33,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:33,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-21 12:50:33,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:33,552 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 18 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-12-21 12:50:33,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:33,652 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:33,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585426267] [2021-12-21 12:50:33,653 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:33,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086712773] [2021-12-21 12:50:33,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1086712773] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:33,653 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:33,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-12-21 12:50:33,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633573194] [2021-12-21 12:50:33,653 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:33,653 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-21 12:50:33,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:33,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-21 12:50:33,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-12-21 12:50:33,654 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 14 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-21 12:50:33,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:33,796 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2021-12-21 12:50:33,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-21 12:50:33,796 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 78 [2021-12-21 12:50:33,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:33,797 INFO L225 Difference]: With dead ends: 94 [2021-12-21 12:50:33,797 INFO L226 Difference]: Without dead ends: 89 [2021-12-21 12:50:33,797 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-12-21 12:50:33,797 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 2 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:33,797 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 466 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:50:33,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-21 12:50:33,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-12-21 12:50:33,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:50:33,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2021-12-21 12:50:33,805 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 78 [2021-12-21 12:50:33,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:33,805 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2021-12-21 12:50:33,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-21 12:50:33,806 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2021-12-21 12:50:33,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-12-21 12:50:33,806 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:33,806 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:33,827 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:34,011 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-21 12:50:34,012 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:34,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:34,012 INFO L85 PathProgramCache]: Analyzing trace with hash -1699951246, now seen corresponding path program 9 times [2021-12-21 12:50:34,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:34,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081095866] [2021-12-21 12:50:34,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:34,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:34,018 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:34,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1030897605] [2021-12-21 12:50:34,019 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:50:34,019 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:34,019 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:34,036 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:34,036 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-21 12:50:34,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-12-21 12:50:34,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:34,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 44 conjunts are in the unsatisfiable core [2021-12-21 12:50:34,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:34,661 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 20 proven. 180 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-12-21 12:50:34,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:34,809 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:34,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081095866] [2021-12-21 12:50:34,809 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:34,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030897605] [2021-12-21 12:50:34,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1030897605] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:34,809 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:34,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-12-21 12:50:34,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844421726] [2021-12-21 12:50:34,810 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:34,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-21 12:50:34,810 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:34,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-21 12:50:34,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-12-21 12:50:34,810 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand has 15 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:50:34,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:34,970 INFO L93 Difference]: Finished difference Result 96 states and 98 transitions. [2021-12-21 12:50:34,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 12:50:34,970 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 86 [2021-12-21 12:50:34,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:34,971 INFO L225 Difference]: With dead ends: 96 [2021-12-21 12:50:34,971 INFO L226 Difference]: Without dead ends: 91 [2021-12-21 12:50:34,971 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2021-12-21 12:50:34,971 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 2 mSDsluCounter, 494 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 544 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:34,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 544 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 282 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:50:34,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-12-21 12:50:34,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-12-21 12:50:34,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 68 states have (on average 1.0294117647058822) internal successors, (70), 68 states have internal predecessors, (70), 12 states have call successors, (12), 11 states have call predecessors, (12), 10 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-21 12:50:34,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2021-12-21 12:50:34,976 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 86 [2021-12-21 12:50:34,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:34,976 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2021-12-21 12:50:34,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:50:34,977 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2021-12-21 12:50:34,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-12-21 12:50:34,977 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:34,977 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:34,983 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:35,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:35,178 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:35,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:35,178 INFO L85 PathProgramCache]: Analyzing trace with hash -780287977, now seen corresponding path program 3 times [2021-12-21 12:50:35,178 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:35,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132891836] [2021-12-21 12:50:35,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:35,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:35,183 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:35,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [83706109] [2021-12-21 12:50:35,183 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:50:35,183 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:35,184 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:35,186 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:35,187 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-21 12:50:35,751 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-12-21 12:50:35,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:35,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-21 12:50:35,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:35,938 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:50:35,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:36,219 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-12-21 12:50:36,219 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:36,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132891836] [2021-12-21 12:50:36,220 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:36,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [83706109] [2021-12-21 12:50:36,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [83706109] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:50:36,220 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 12:50:36,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2021-12-21 12:50:36,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483594593] [2021-12-21 12:50:36,220 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:36,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-21 12:50:36,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:36,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-21 12:50:36,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=369, Unknown=0, NotChecked=0, Total=650 [2021-12-21 12:50:36,222 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 26 states, 26 states have (on average 4.0) internal successors, (104), 26 states have internal predecessors, (104), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-21 12:50:36,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:36,564 INFO L93 Difference]: Finished difference Result 245 states and 257 transitions. [2021-12-21 12:50:36,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-12-21 12:50:36,565 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.0) internal successors, (104), 26 states have internal predecessors, (104), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Word has length 88 [2021-12-21 12:50:36,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:36,566 INFO L225 Difference]: With dead ends: 245 [2021-12-21 12:50:36,566 INFO L226 Difference]: Without dead ends: 240 [2021-12-21 12:50:36,567 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=796, Invalid=1366, Unknown=0, NotChecked=0, Total=2162 [2021-12-21 12:50:36,567 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 233 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:36,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 214 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:50:36,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-12-21 12:50:36,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 185. [2021-12-21 12:50:36,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.0935251798561152) internal successors, (152), 139 states have internal predecessors, (152), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:36,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 197 transitions. [2021-12-21 12:50:36,580 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 197 transitions. Word has length 88 [2021-12-21 12:50:36,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:36,580 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 197 transitions. [2021-12-21 12:50:36,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.0) internal successors, (104), 26 states have internal predecessors, (104), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-21 12:50:36,581 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 197 transitions. [2021-12-21 12:50:36,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-12-21 12:50:36,581 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:36,581 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:36,602 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-12-21 12:50:36,786 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-21 12:50:36,786 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:36,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:36,787 INFO L85 PathProgramCache]: Analyzing trace with hash 53411800, now seen corresponding path program 10 times [2021-12-21 12:50:36,787 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:36,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332652833] [2021-12-21 12:50:36,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:36,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:36,800 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:36,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2057628862] [2021-12-21 12:50:36,806 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:50:36,806 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:36,806 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:36,807 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:36,808 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-21 12:50:37,618 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:50:37,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:37,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-21 12:50:37,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:37,993 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 22 proven. 220 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-12-21 12:50:37,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:38,112 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:38,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332652833] [2021-12-21 12:50:38,112 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:38,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057628862] [2021-12-21 12:50:38,112 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057628862] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:38,112 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:38,112 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-12-21 12:50:38,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770373400] [2021-12-21 12:50:38,113 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:38,113 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 12:50:38,113 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:38,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 12:50:38,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-12-21 12:50:38,114 INFO L87 Difference]: Start difference. First operand 185 states and 197 transitions. Second operand has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-21 12:50:38,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:38,298 INFO L93 Difference]: Finished difference Result 190 states and 201 transitions. [2021-12-21 12:50:38,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-21 12:50:38,298 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 94 [2021-12-21 12:50:38,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:38,299 INFO L225 Difference]: With dead ends: 190 [2021-12-21 12:50:38,299 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 12:50:38,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-12-21 12:50:38,300 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 2 mSDsluCounter, 574 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 628 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:38,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 628 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:50:38,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 12:50:38,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-21 12:50:38,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.0863309352517985) internal successors, (151), 139 states have internal predecessors, (151), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:38,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 196 transitions. [2021-12-21 12:50:38,307 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 196 transitions. Word has length 94 [2021-12-21 12:50:38,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:38,307 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 196 transitions. [2021-12-21 12:50:38,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 15 states have internal predecessors, (41), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-21 12:50:38,307 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 196 transitions. [2021-12-21 12:50:38,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-12-21 12:50:38,308 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:38,308 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:38,313 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:38,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-21 12:50:38,508 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:38,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:38,509 INFO L85 PathProgramCache]: Analyzing trace with hash 983788606, now seen corresponding path program 11 times [2021-12-21 12:50:38,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:38,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155505058] [2021-12-21 12:50:38,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:38,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:38,514 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:38,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1449213384] [2021-12-21 12:50:38,514 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:50:38,514 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:38,514 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:38,515 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:38,554 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-21 12:50:38,932 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-12-21 12:50:38,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:38,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-21 12:50:38,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:39,286 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 24 proven. 264 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-12-21 12:50:39,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:39,474 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:39,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155505058] [2021-12-21 12:50:39,474 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:39,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449213384] [2021-12-21 12:50:39,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449213384] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:39,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:39,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-12-21 12:50:39,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103042125] [2021-12-21 12:50:39,476 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:39,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 12:50:39,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:39,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 12:50:39,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-12-21 12:50:39,487 INFO L87 Difference]: Start difference. First operand 185 states and 196 transitions. Second operand has 17 states, 16 states have (on average 2.75) internal successors, (44), 16 states have internal predecessors, (44), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-21 12:50:39,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:39,698 INFO L93 Difference]: Finished difference Result 190 states and 200 transitions. [2021-12-21 12:50:39,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-21 12:50:39,698 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.75) internal successors, (44), 16 states have internal predecessors, (44), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 102 [2021-12-21 12:50:39,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:39,699 INFO L225 Difference]: With dead ends: 190 [2021-12-21 12:50:39,699 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 12:50:39,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2021-12-21 12:50:39,705 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 2 mSDsluCounter, 660 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 718 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:39,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 718 Invalid, 384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:50:39,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 12:50:39,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-21 12:50:39,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.079136690647482) internal successors, (150), 139 states have internal predecessors, (150), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:39,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 195 transitions. [2021-12-21 12:50:39,728 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 195 transitions. Word has length 102 [2021-12-21 12:50:39,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:39,728 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 195 transitions. [2021-12-21 12:50:39,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.75) internal successors, (44), 16 states have internal predecessors, (44), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-21 12:50:39,728 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 195 transitions. [2021-12-21 12:50:39,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-12-21 12:50:39,730 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:39,730 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:39,736 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:39,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-21 12:50:39,937 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:39,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:39,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1339026780, now seen corresponding path program 12 times [2021-12-21 12:50:39,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:39,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839294923] [2021-12-21 12:50:39,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:39,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:39,942 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:39,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [116571843] [2021-12-21 12:50:39,942 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:50:39,942 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:39,942 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:39,946 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:39,960 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-21 12:50:40,381 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-12-21 12:50:40,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:40,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 56 conjunts are in the unsatisfiable core [2021-12-21 12:50:40,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:40,722 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 26 proven. 312 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-12-21 12:50:40,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:40,880 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:40,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839294923] [2021-12-21 12:50:40,880 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:40,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116571843] [2021-12-21 12:50:40,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [116571843] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:40,880 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:40,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-12-21 12:50:40,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890578947] [2021-12-21 12:50:40,880 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:40,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-21 12:50:40,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:40,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-21 12:50:40,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2021-12-21 12:50:40,881 INFO L87 Difference]: Start difference. First operand 185 states and 195 transitions. Second operand has 18 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-12-21 12:50:41,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:41,113 INFO L93 Difference]: Finished difference Result 190 states and 199 transitions. [2021-12-21 12:50:41,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-21 12:50:41,113 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 110 [2021-12-21 12:50:41,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:41,114 INFO L225 Difference]: With dead ends: 190 [2021-12-21 12:50:41,114 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 12:50:41,115 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-12-21 12:50:41,116 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 2 mSDsluCounter, 752 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 814 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:41,116 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 814 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 441 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:50:41,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 12:50:41,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-21 12:50:41,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.0719424460431655) internal successors, (149), 139 states have internal predecessors, (149), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:41,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 194 transitions. [2021-12-21 12:50:41,142 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 194 transitions. Word has length 110 [2021-12-21 12:50:41,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:41,143 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 194 transitions. [2021-12-21 12:50:41,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-12-21 12:50:41,143 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 194 transitions. [2021-12-21 12:50:41,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-12-21 12:50:41,144 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:41,144 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:41,151 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:41,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:41,349 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:41,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:41,349 INFO L85 PathProgramCache]: Analyzing trace with hash 1291514634, now seen corresponding path program 13 times [2021-12-21 12:50:41,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:41,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600041334] [2021-12-21 12:50:41,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:41,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:41,380 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:41,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [810217532] [2021-12-21 12:50:41,380 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:50:41,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:41,381 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:41,381 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:41,385 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-21 12:50:41,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:41,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-21 12:50:41,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:42,151 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 28 proven. 364 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-12-21 12:50:42,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:42,262 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:42,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600041334] [2021-12-21 12:50:42,263 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:42,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [810217532] [2021-12-21 12:50:42,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [810217532] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:42,263 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:42,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-12-21 12:50:42,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012685580] [2021-12-21 12:50:42,263 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:42,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-21 12:50:42,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:42,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-21 12:50:42,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2021-12-21 12:50:42,264 INFO L87 Difference]: Start difference. First operand 185 states and 194 transitions. Second operand has 19 states, 18 states have (on average 2.7777777777777777) internal successors, (50), 18 states have internal predecessors, (50), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-12-21 12:50:42,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:42,561 INFO L93 Difference]: Finished difference Result 190 states and 198 transitions. [2021-12-21 12:50:42,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-21 12:50:42,561 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.7777777777777777) internal successors, (50), 18 states have internal predecessors, (50), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 118 [2021-12-21 12:50:42,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:42,562 INFO L225 Difference]: With dead ends: 190 [2021-12-21 12:50:42,562 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 12:50:42,562 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 110 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-12-21 12:50:42,562 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 2 mSDsluCounter, 850 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 916 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:42,563 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 916 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 12:50:42,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 12:50:42,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-21 12:50:42,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.064748201438849) internal successors, (148), 139 states have internal predecessors, (148), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:42,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 193 transitions. [2021-12-21 12:50:42,570 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 193 transitions. Word has length 118 [2021-12-21 12:50:42,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:42,570 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 193 transitions. [2021-12-21 12:50:42,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.7777777777777777) internal successors, (50), 18 states have internal predecessors, (50), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-12-21 12:50:42,570 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 193 transitions. [2021-12-21 12:50:42,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-12-21 12:50:42,571 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:42,571 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:42,578 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-12-21 12:50:42,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:42,776 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:42,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:42,777 INFO L85 PathProgramCache]: Analyzing trace with hash 1948913008, now seen corresponding path program 14 times [2021-12-21 12:50:42,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:42,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322913456] [2021-12-21 12:50:42,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:42,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:42,782 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:42,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [55424667] [2021-12-21 12:50:42,783 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:50:42,783 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:42,783 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:42,784 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:42,802 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-21 12:50:43,220 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:50:43,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:43,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 64 conjunts are in the unsatisfiable core [2021-12-21 12:50:43,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:43,671 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 30 proven. 420 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-12-21 12:50:43,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:43,886 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:43,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322913456] [2021-12-21 12:50:43,886 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:43,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55424667] [2021-12-21 12:50:43,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55424667] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:43,887 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:43,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-12-21 12:50:43,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695072655] [2021-12-21 12:50:43,887 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:43,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-21 12:50:43,887 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:43,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-21 12:50:43,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2021-12-21 12:50:43,888 INFO L87 Difference]: Start difference. First operand 185 states and 193 transitions. Second operand has 20 states, 19 states have (on average 2.789473684210526) internal successors, (53), 19 states have internal predecessors, (53), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-21 12:50:44,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:44,188 INFO L93 Difference]: Finished difference Result 190 states and 197 transitions. [2021-12-21 12:50:44,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-21 12:50:44,188 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.789473684210526) internal successors, (53), 19 states have internal predecessors, (53), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Word has length 126 [2021-12-21 12:50:44,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:44,189 INFO L225 Difference]: With dead ends: 190 [2021-12-21 12:50:44,189 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 12:50:44,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 117 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2021-12-21 12:50:44,190 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 2 mSDsluCounter, 954 mSDsCounter, 0 mSdLazyCounter, 567 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1024 SdHoareTripleChecker+Invalid, 567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:44,190 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1024 Invalid, 567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 567 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 12:50:44,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 12:50:44,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-21 12:50:44,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.0575539568345325) internal successors, (147), 139 states have internal predecessors, (147), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:44,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 192 transitions. [2021-12-21 12:50:44,198 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 192 transitions. Word has length 126 [2021-12-21 12:50:44,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:44,198 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 192 transitions. [2021-12-21 12:50:44,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.789473684210526) internal successors, (53), 19 states have internal predecessors, (53), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-21 12:50:44,199 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 192 transitions. [2021-12-21 12:50:44,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-12-21 12:50:44,199 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:44,199 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:44,207 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:44,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-12-21 12:50:44,405 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:44,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:44,406 INFO L85 PathProgramCache]: Analyzing trace with hash 48456150, now seen corresponding path program 15 times [2021-12-21 12:50:44,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:44,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120030767] [2021-12-21 12:50:44,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:44,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:44,411 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:44,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1607444137] [2021-12-21 12:50:44,411 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:50:44,411 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:44,412 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:44,413 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:44,413 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-21 12:50:45,211 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-12-21 12:50:45,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:45,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 68 conjunts are in the unsatisfiable core [2021-12-21 12:50:45,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:45,668 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 32 proven. 480 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-12-21 12:50:45,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:45,847 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:45,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120030767] [2021-12-21 12:50:45,847 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:45,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1607444137] [2021-12-21 12:50:45,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1607444137] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:45,848 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:45,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-12-21 12:50:45,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375642490] [2021-12-21 12:50:45,848 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:45,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-21 12:50:45,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:45,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-21 12:50:45,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2021-12-21 12:50:45,850 INFO L87 Difference]: Start difference. First operand 185 states and 192 transitions. Second operand has 21 states, 20 states have (on average 2.8) internal successors, (56), 20 states have internal predecessors, (56), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-21 12:50:46,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:46,192 INFO L93 Difference]: Finished difference Result 190 states and 196 transitions. [2021-12-21 12:50:46,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-21 12:50:46,192 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.8) internal successors, (56), 20 states have internal predecessors, (56), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 134 [2021-12-21 12:50:46,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:46,193 INFO L225 Difference]: With dead ends: 190 [2021-12-21 12:50:46,193 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 12:50:46,193 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2021-12-21 12:50:46,194 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 2 mSDsluCounter, 1064 mSDsCounter, 0 mSdLazyCounter, 636 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1138 SdHoareTripleChecker+Invalid, 636 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 636 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:46,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1138 Invalid, 636 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 636 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 12:50:46,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 12:50:46,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-21 12:50:46,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.0503597122302157) internal successors, (146), 139 states have internal predecessors, (146), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:46,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 191 transitions. [2021-12-21 12:50:46,201 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 191 transitions. Word has length 134 [2021-12-21 12:50:46,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:46,201 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 191 transitions. [2021-12-21 12:50:46,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.8) internal successors, (56), 20 states have internal predecessors, (56), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-21 12:50:46,201 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 191 transitions. [2021-12-21 12:50:46,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-12-21 12:50:46,202 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:46,202 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:46,211 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:46,408 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-21 12:50:46,408 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:46,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:46,409 INFO L85 PathProgramCache]: Analyzing trace with hash 1347219516, now seen corresponding path program 16 times [2021-12-21 12:50:46,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:46,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087057861] [2021-12-21 12:50:46,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:46,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:46,414 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:46,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [161493015] [2021-12-21 12:50:46,414 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:50:46,415 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:46,415 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:46,415 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:46,417 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-21 12:50:47,572 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:50:47,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:47,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 72 conjunts are in the unsatisfiable core [2021-12-21 12:50:47,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:48,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 34 proven. 544 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2021-12-21 12:50:48,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:48,171 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:48,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087057861] [2021-12-21 12:50:48,172 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:48,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161493015] [2021-12-21 12:50:48,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161493015] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:48,172 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:48,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2021-12-21 12:50:48,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057748030] [2021-12-21 12:50:48,172 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:48,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-21 12:50:48,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:48,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-21 12:50:48,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2021-12-21 12:50:48,174 INFO L87 Difference]: Start difference. First operand 185 states and 191 transitions. Second operand has 22 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 21 states have internal predecessors, (59), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-12-21 12:50:48,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:48,573 INFO L93 Difference]: Finished difference Result 190 states and 195 transitions. [2021-12-21 12:50:48,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-21 12:50:48,573 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 21 states have internal predecessors, (59), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Word has length 142 [2021-12-21 12:50:48,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:48,574 INFO L225 Difference]: With dead ends: 190 [2021-12-21 12:50:48,574 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 12:50:48,574 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 131 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2021-12-21 12:50:48,575 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 2 mSDsluCounter, 1180 mSDsCounter, 0 mSdLazyCounter, 709 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1258 SdHoareTripleChecker+Invalid, 709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 709 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:48,575 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1258 Invalid, 709 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 709 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-21 12:50:48,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 12:50:48,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-21 12:50:48,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.0431654676258992) internal successors, (145), 139 states have internal predecessors, (145), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:48,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 190 transitions. [2021-12-21 12:50:48,582 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 190 transitions. Word has length 142 [2021-12-21 12:50:48,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:48,583 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 190 transitions. [2021-12-21 12:50:48,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 21 states have internal predecessors, (59), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-12-21 12:50:48,583 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 190 transitions. [2021-12-21 12:50:48,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-12-21 12:50:48,584 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:48,584 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:48,603 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:48,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:48,791 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:48,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:48,791 INFO L85 PathProgramCache]: Analyzing trace with hash 764197026, now seen corresponding path program 17 times [2021-12-21 12:50:48,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:48,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687342634] [2021-12-21 12:50:48,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:48,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:48,804 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:48,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1043237223] [2021-12-21 12:50:48,805 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:50:48,805 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:48,805 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:48,806 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:48,807 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-21 12:50:49,422 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-12-21 12:50:49,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:49,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 76 conjunts are in the unsatisfiable core [2021-12-21 12:50:49,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:49,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 36 proven. 612 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2021-12-21 12:50:49,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:50,110 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:50,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687342634] [2021-12-21 12:50:50,110 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:50,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1043237223] [2021-12-21 12:50:50,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1043237223] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:50,111 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:50,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-12-21 12:50:50,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731320146] [2021-12-21 12:50:50,111 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:50,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-21 12:50:50,111 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:50,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-21 12:50:50,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2021-12-21 12:50:50,112 INFO L87 Difference]: Start difference. First operand 185 states and 190 transitions. Second operand has 23 states, 22 states have (on average 2.8181818181818183) internal successors, (62), 22 states have internal predecessors, (62), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-21 12:50:50,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:50,538 INFO L93 Difference]: Finished difference Result 190 states and 194 transitions. [2021-12-21 12:50:50,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 12:50:50,538 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.8181818181818183) internal successors, (62), 22 states have internal predecessors, (62), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Word has length 150 [2021-12-21 12:50:50,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:50,539 INFO L225 Difference]: With dead ends: 190 [2021-12-21 12:50:50,539 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 12:50:50,539 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=674, Unknown=0, NotChecked=0, Total=756 [2021-12-21 12:50:50,540 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 2 mSDsluCounter, 1302 mSDsCounter, 0 mSdLazyCounter, 786 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1384 SdHoareTripleChecker+Invalid, 786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:50,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1384 Invalid, 786 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 786 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-21 12:50:50,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 12:50:50,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-21 12:50:50,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.0359712230215827) internal successors, (144), 139 states have internal predecessors, (144), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:50,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 189 transitions. [2021-12-21 12:50:50,548 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 189 transitions. Word has length 150 [2021-12-21 12:50:50,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:50,548 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 189 transitions. [2021-12-21 12:50:50,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.8181818181818183) internal successors, (62), 22 states have internal predecessors, (62), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-21 12:50:50,549 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 189 transitions. [2021-12-21 12:50:50,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-12-21 12:50:50,550 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:50,550 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:50,569 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-12-21 12:50:50,756 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:50,756 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:50,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:50,757 INFO L85 PathProgramCache]: Analyzing trace with hash -439829752, now seen corresponding path program 18 times [2021-12-21 12:50:50,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:50,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946977994] [2021-12-21 12:50:50,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:50,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:50,763 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:50,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [608611816] [2021-12-21 12:50:50,764 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:50:50,764 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:50,764 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:50,765 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:50,765 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-21 12:50:51,698 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-12-21 12:50:51,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:51,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 80 conjunts are in the unsatisfiable core [2021-12-21 12:50:51,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:52,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 38 proven. 684 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2021-12-21 12:50:52,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:52,375 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:52,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946977994] [2021-12-21 12:50:52,375 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:52,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608611816] [2021-12-21 12:50:52,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [608611816] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:52,375 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:52,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2021-12-21 12:50:52,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120010564] [2021-12-21 12:50:52,376 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:52,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-21 12:50:52,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:52,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-21 12:50:52,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2021-12-21 12:50:52,379 INFO L87 Difference]: Start difference. First operand 185 states and 189 transitions. Second operand has 24 states, 23 states have (on average 2.8260869565217392) internal successors, (65), 23 states have internal predecessors, (65), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-12-21 12:50:52,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:52,783 INFO L93 Difference]: Finished difference Result 190 states and 193 transitions. [2021-12-21 12:50:52,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-12-21 12:50:52,783 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.8260869565217392) internal successors, (65), 23 states have internal predecessors, (65), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) Word has length 158 [2021-12-21 12:50:52,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:52,787 INFO L225 Difference]: With dead ends: 190 [2021-12-21 12:50:52,788 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 12:50:52,788 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 145 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=85, Invalid=727, Unknown=0, NotChecked=0, Total=812 [2021-12-21 12:50:52,789 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 2 mSDsluCounter, 1430 mSDsCounter, 0 mSdLazyCounter, 867 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1516 SdHoareTripleChecker+Invalid, 867 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 867 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:52,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1516 Invalid, 867 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 867 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-21 12:50:52,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 12:50:52,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-21 12:50:52,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.0287769784172662) internal successors, (143), 139 states have internal predecessors, (143), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:52,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 188 transitions. [2021-12-21 12:50:52,808 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 188 transitions. Word has length 158 [2021-12-21 12:50:52,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:52,809 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 188 transitions. [2021-12-21 12:50:52,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.8260869565217392) internal successors, (65), 23 states have internal predecessors, (65), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-12-21 12:50:52,810 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 188 transitions. [2021-12-21 12:50:52,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-12-21 12:50:52,822 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:52,822 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:52,828 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:53,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-12-21 12:50:53,028 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:53,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:53,028 INFO L85 PathProgramCache]: Analyzing trace with hash 1042741102, now seen corresponding path program 19 times [2021-12-21 12:50:53,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:53,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393691364] [2021-12-21 12:50:53,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:53,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:53,035 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:53,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1352795997] [2021-12-21 12:50:53,035 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:50:53,035 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:53,035 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:53,036 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:53,037 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-12-21 12:50:53,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:50:53,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 84 conjunts are in the unsatisfiable core [2021-12-21 12:50:53,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:54,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 40 proven. 760 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2021-12-21 12:50:54,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:54,348 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:54,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393691364] [2021-12-21 12:50:54,348 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:54,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352795997] [2021-12-21 12:50:54,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352795997] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:54,348 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:54,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2021-12-21 12:50:54,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86030099] [2021-12-21 12:50:54,349 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:54,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-21 12:50:54,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:54,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-21 12:50:54,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2021-12-21 12:50:54,350 INFO L87 Difference]: Start difference. First operand 185 states and 188 transitions. Second operand has 25 states, 24 states have (on average 2.8333333333333335) internal successors, (68), 24 states have internal predecessors, (68), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-21 12:50:54,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:54,800 INFO L93 Difference]: Finished difference Result 190 states and 192 transitions. [2021-12-21 12:50:54,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-21 12:50:54,800 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.8333333333333335) internal successors, (68), 24 states have internal predecessors, (68), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Word has length 166 [2021-12-21 12:50:54,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:54,801 INFO L225 Difference]: With dead ends: 190 [2021-12-21 12:50:54,801 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 12:50:54,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 152 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=88, Invalid=782, Unknown=0, NotChecked=0, Total=870 [2021-12-21 12:50:54,802 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 2 mSDsluCounter, 1564 mSDsCounter, 0 mSdLazyCounter, 952 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1654 SdHoareTripleChecker+Invalid, 952 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 952 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:54,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1654 Invalid, 952 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 952 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-21 12:50:54,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 12:50:54,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-21 12:50:54,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.0215827338129497) internal successors, (142), 139 states have internal predecessors, (142), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:54,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 187 transitions. [2021-12-21 12:50:54,823 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 187 transitions. Word has length 166 [2021-12-21 12:50:54,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:54,823 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 187 transitions. [2021-12-21 12:50:54,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.8333333333333335) internal successors, (68), 24 states have internal predecessors, (68), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-21 12:50:54,824 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 187 transitions. [2021-12-21 12:50:54,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-12-21 12:50:54,824 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:54,824 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:54,830 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:55,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-12-21 12:50:55,030 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:55,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:55,031 INFO L85 PathProgramCache]: Analyzing trace with hash 1976397268, now seen corresponding path program 20 times [2021-12-21 12:50:55,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:55,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679630265] [2021-12-21 12:50:55,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:55,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:55,041 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:55,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [437004485] [2021-12-21 12:50:55,042 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:50:55,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:55,042 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:55,043 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:55,044 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-12-21 12:50:55,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:50:55,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:55,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 88 conjunts are in the unsatisfiable core [2021-12-21 12:50:55,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:56,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 42 proven. 840 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2021-12-21 12:50:56,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:56,500 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:56,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679630265] [2021-12-21 12:50:56,501 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:56,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [437004485] [2021-12-21 12:50:56,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [437004485] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:56,501 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:56,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2021-12-21 12:50:56,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854730250] [2021-12-21 12:50:56,501 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:56,501 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-21 12:50:56,501 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:56,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-21 12:50:56,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2021-12-21 12:50:56,502 INFO L87 Difference]: Start difference. First operand 185 states and 187 transitions. Second operand has 26 states, 25 states have (on average 2.84) internal successors, (71), 25 states have internal predecessors, (71), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-12-21 12:50:57,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:57,033 INFO L93 Difference]: Finished difference Result 190 states and 191 transitions. [2021-12-21 12:50:57,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-21 12:50:57,033 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.84) internal successors, (71), 25 states have internal predecessors, (71), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) Word has length 174 [2021-12-21 12:50:57,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:57,034 INFO L225 Difference]: With dead ends: 190 [2021-12-21 12:50:57,034 INFO L226 Difference]: Without dead ends: 185 [2021-12-21 12:50:57,035 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=839, Unknown=0, NotChecked=0, Total=930 [2021-12-21 12:50:57,035 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 2 mSDsluCounter, 1704 mSDsCounter, 0 mSdLazyCounter, 1041 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1798 SdHoareTripleChecker+Invalid, 1041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1041 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:57,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1798 Invalid, 1041 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1041 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-21 12:50:57,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-21 12:50:57,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-21 12:50:57,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 139 states have (on average 1.014388489208633) internal successors, (141), 139 states have internal predecessors, (141), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:57,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 186 transitions. [2021-12-21 12:50:57,044 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 186 transitions. Word has length 174 [2021-12-21 12:50:57,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:57,044 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 186 transitions. [2021-12-21 12:50:57,044 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.84) internal successors, (71), 25 states have internal predecessors, (71), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-12-21 12:50:57,044 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 186 transitions. [2021-12-21 12:50:57,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-12-21 12:50:57,046 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:57,046 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:57,052 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:57,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-12-21 12:50:57,252 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:57,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:57,252 INFO L85 PathProgramCache]: Analyzing trace with hash 1172446778, now seen corresponding path program 21 times [2021-12-21 12:50:57,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:57,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710347150] [2021-12-21 12:50:57,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:57,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:57,259 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:57,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1158836783] [2021-12-21 12:50:57,259 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:50:57,259 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:57,259 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:57,260 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:57,261 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-12-21 12:50:58,156 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-12-21 12:50:58,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:50:58,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 500 conjuncts, 92 conjunts are in the unsatisfiable core [2021-12-21 12:50:58,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:50:58,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 44 proven. 924 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2021-12-21 12:50:58,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:50:58,722 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:50:58,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710347150] [2021-12-21 12:50:58,722 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:50:58,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1158836783] [2021-12-21 12:50:58,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1158836783] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:50:58,722 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:50:58,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2021-12-21 12:50:58,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019268737] [2021-12-21 12:50:58,723 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:50:58,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-21 12:50:58,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:50:58,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-21 12:50:58,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2021-12-21 12:50:58,724 INFO L87 Difference]: Start difference. First operand 185 states and 186 transitions. Second operand has 27 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 26 states have internal predecessors, (74), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:59,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:50:59,236 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2021-12-21 12:50:59,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-21 12:50:59,236 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 26 states have internal predecessors, (74), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Word has length 182 [2021-12-21 12:50:59,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:50:59,237 INFO L225 Difference]: With dead ends: 192 [2021-12-21 12:50:59,237 INFO L226 Difference]: Without dead ends: 187 [2021-12-21 12:50:59,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 166 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=94, Invalid=898, Unknown=0, NotChecked=0, Total=992 [2021-12-21 12:50:59,238 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 2 mSDsluCounter, 1850 mSDsCounter, 0 mSdLazyCounter, 1134 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1948 SdHoareTripleChecker+Invalid, 1134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 12:50:59,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1948 Invalid, 1134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1134 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-21 12:50:59,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-12-21 12:50:59,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2021-12-21 12:50:59,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 140 states have (on average 1.0142857142857142) internal successors, (142), 140 states have internal predecessors, (142), 24 states have call successors, (24), 23 states have call predecessors, (24), 22 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-12-21 12:50:59,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 189 transitions. [2021-12-21 12:50:59,248 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 189 transitions. Word has length 182 [2021-12-21 12:50:59,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:50:59,249 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 189 transitions. [2021-12-21 12:50:59,250 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 26 states have internal predecessors, (74), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-21 12:50:59,250 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 189 transitions. [2021-12-21 12:50:59,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-12-21 12:50:59,251 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:50:59,251 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1] [2021-12-21 12:50:59,260 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-12-21 12:50:59,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-12-21 12:50:59,458 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:50:59,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:50:59,459 INFO L85 PathProgramCache]: Analyzing trace with hash -2069758241, now seen corresponding path program 4 times [2021-12-21 12:50:59,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:50:59,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54985541] [2021-12-21 12:50:59,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:50:59,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:50:59,469 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:50:59,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1457256826] [2021-12-21 12:50:59,469 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:50:59,470 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:50:59,470 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:50:59,471 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:50:59,473 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-12-21 12:51:00,607 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:51:00,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:00,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 511 conjuncts, 47 conjunts are in the unsatisfiable core [2021-12-21 12:51:00,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:01,043 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:51:01,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:01,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 968 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2021-12-21 12:51:01,732 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:01,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54985541] [2021-12-21 12:51:01,733 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:01,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457256826] [2021-12-21 12:51:01,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1457256826] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:51:01,733 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 12:51:01,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2021-12-21 12:51:01,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487352883] [2021-12-21 12:51:01,733 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:01,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-12-21 12:51:01,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:01,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-12-21 12:51:01,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1133, Invalid=1317, Unknown=0, NotChecked=0, Total=2450 [2021-12-21 12:51:01,735 INFO L87 Difference]: Start difference. First operand 187 states and 189 transitions. Second operand has 50 states, 50 states have (on average 4.24) internal successors, (212), 50 states have internal predecessors, (212), 45 states have call successors, (45), 24 states have call predecessors, (45), 23 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2021-12-21 12:51:02,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:02,874 INFO L93 Difference]: Finished difference Result 497 states and 521 transitions. [2021-12-21 12:51:02,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-12-21 12:51:02,875 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.24) internal successors, (212), 50 states have internal predecessors, (212), 45 states have call successors, (45), 24 states have call predecessors, (45), 23 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) Word has length 184 [2021-12-21 12:51:02,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:02,876 INFO L225 Difference]: With dead ends: 497 [2021-12-21 12:51:02,877 INFO L226 Difference]: Without dead ends: 492 [2021-12-21 12:51:02,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1288 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=3316, Invalid=5614, Unknown=0, NotChecked=0, Total=8930 [2021-12-21 12:51:02,879 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 802 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 351 mSolverCounterSat, 270 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 802 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 270 IncrementalHoareTripleChecker+Valid, 351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:02,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [802 Valid, 390 Invalid, 621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [270 Valid, 351 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 12:51:02,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-12-21 12:51:02,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 377. [2021-12-21 12:51:02,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 283 states have (on average 1.088339222614841) internal successors, (308), 283 states have internal predecessors, (308), 47 states have call successors, (47), 47 states have call predecessors, (47), 46 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2021-12-21 12:51:02,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 401 transitions. [2021-12-21 12:51:02,900 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 401 transitions. Word has length 184 [2021-12-21 12:51:02,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:02,900 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 401 transitions. [2021-12-21 12:51:02,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.24) internal successors, (212), 50 states have internal predecessors, (212), 45 states have call successors, (45), 24 states have call predecessors, (45), 23 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2021-12-21 12:51:02,901 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 401 transitions. [2021-12-21 12:51:02,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2021-12-21 12:51:02,902 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:02,902 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:02,925 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:03,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-12-21 12:51:03,108 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:03,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:03,108 INFO L85 PathProgramCache]: Analyzing trace with hash -510981984, now seen corresponding path program 22 times [2021-12-21 12:51:03,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:03,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1275549489] [2021-12-21 12:51:03,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:03,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:03,116 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:03,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1477574913] [2021-12-21 12:51:03,116 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:51:03,116 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:03,116 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:03,128 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:03,129 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-12-21 12:51:04,416 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:51:04,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:04,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 96 conjunts are in the unsatisfiable core [2021-12-21 12:51:04,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:05,131 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 46 proven. 1012 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2021-12-21 12:51:05,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:05,298 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:05,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1275549489] [2021-12-21 12:51:05,298 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:05,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477574913] [2021-12-21 12:51:05,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477574913] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:05,298 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:05,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2021-12-21 12:51:05,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147869833] [2021-12-21 12:51:05,298 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:05,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-21 12:51:05,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:05,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-21 12:51:05,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2021-12-21 12:51:05,306 INFO L87 Difference]: Start difference. First operand 377 states and 401 transitions. Second operand has 28 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 27 states have internal predecessors, (77), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-12-21 12:51:05,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:05,928 INFO L93 Difference]: Finished difference Result 382 states and 405 transitions. [2021-12-21 12:51:05,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-21 12:51:05,928 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 27 states have internal predecessors, (77), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) Word has length 190 [2021-12-21 12:51:05,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:05,930 INFO L225 Difference]: With dead ends: 382 [2021-12-21 12:51:05,930 INFO L226 Difference]: Without dead ends: 377 [2021-12-21 12:51:05,930 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 173 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=959, Unknown=0, NotChecked=0, Total=1056 [2021-12-21 12:51:05,930 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 2 mSDsluCounter, 2002 mSDsCounter, 0 mSdLazyCounter, 1231 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2104 SdHoareTripleChecker+Invalid, 1231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:05,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2104 Invalid, 1231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1231 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-21 12:51:05,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-12-21 12:51:05,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2021-12-21 12:51:05,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 283 states have (on average 1.0848056537102473) internal successors, (307), 283 states have internal predecessors, (307), 47 states have call successors, (47), 47 states have call predecessors, (47), 46 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2021-12-21 12:51:05,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 400 transitions. [2021-12-21 12:51:05,945 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 400 transitions. Word has length 190 [2021-12-21 12:51:05,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:05,945 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 400 transitions. [2021-12-21 12:51:05,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 27 states have internal predecessors, (77), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-12-21 12:51:05,945 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 400 transitions. [2021-12-21 12:51:05,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2021-12-21 12:51:05,946 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:05,946 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:05,961 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:06,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:06,152 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:06,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:06,153 INFO L85 PathProgramCache]: Analyzing trace with hash -168940282, now seen corresponding path program 23 times [2021-12-21 12:51:06,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:06,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092562399] [2021-12-21 12:51:06,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:06,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:06,160 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:06,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1411745258] [2021-12-21 12:51:06,161 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:51:06,161 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:06,161 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:06,162 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:06,163 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-12-21 12:51:10,189 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-12-21 12:51:10,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:10,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 100 conjunts are in the unsatisfiable core [2021-12-21 12:51:10,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:10,924 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 48 proven. 1104 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2021-12-21 12:51:10,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:11,097 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:11,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092562399] [2021-12-21 12:51:11,097 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:11,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411745258] [2021-12-21 12:51:11,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411745258] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:11,097 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:11,097 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2021-12-21 12:51:11,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118935816] [2021-12-21 12:51:11,097 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:11,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-21 12:51:11,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:11,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-21 12:51:11,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2021-12-21 12:51:11,098 INFO L87 Difference]: Start difference. First operand 377 states and 400 transitions. Second operand has 29 states, 28 states have (on average 2.857142857142857) internal successors, (80), 28 states have internal predecessors, (80), 25 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-12-21 12:51:11,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:11,760 INFO L93 Difference]: Finished difference Result 382 states and 404 transitions. [2021-12-21 12:51:11,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-21 12:51:11,760 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.857142857142857) internal successors, (80), 28 states have internal predecessors, (80), 25 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) Word has length 198 [2021-12-21 12:51:11,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:11,761 INFO L225 Difference]: With dead ends: 382 [2021-12-21 12:51:11,761 INFO L226 Difference]: Without dead ends: 377 [2021-12-21 12:51:11,762 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 180 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=100, Invalid=1022, Unknown=0, NotChecked=0, Total=1122 [2021-12-21 12:51:11,762 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 2 mSDsluCounter, 2160 mSDsCounter, 0 mSdLazyCounter, 1332 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2266 SdHoareTripleChecker+Invalid, 1332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:11,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2266 Invalid, 1332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1332 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-21 12:51:11,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-12-21 12:51:11,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2021-12-21 12:51:11,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 283 states have (on average 1.0812720848056536) internal successors, (306), 283 states have internal predecessors, (306), 47 states have call successors, (47), 47 states have call predecessors, (47), 46 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2021-12-21 12:51:11,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 399 transitions. [2021-12-21 12:51:11,776 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 399 transitions. Word has length 198 [2021-12-21 12:51:11,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:11,776 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 399 transitions. [2021-12-21 12:51:11,776 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.857142857142857) internal successors, (80), 28 states have internal predecessors, (80), 25 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-12-21 12:51:11,776 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 399 transitions. [2021-12-21 12:51:11,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-12-21 12:51:11,777 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:11,777 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:11,787 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:11,985 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-12-21 12:51:11,985 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:11,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:11,986 INFO L85 PathProgramCache]: Analyzing trace with hash -1439593620, now seen corresponding path program 24 times [2021-12-21 12:51:11,986 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:11,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353283047] [2021-12-21 12:51:11,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:11,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:11,992 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:11,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [540057027] [2021-12-21 12:51:11,993 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:51:11,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:11,993 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:11,994 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:11,995 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-12-21 12:51:13,472 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-12-21 12:51:13,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:13,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 104 conjunts are in the unsatisfiable core [2021-12-21 12:51:13,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:14,014 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 50 proven. 1200 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2021-12-21 12:51:14,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:14,209 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:14,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353283047] [2021-12-21 12:51:14,209 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:14,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540057027] [2021-12-21 12:51:14,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [540057027] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:14,209 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:14,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2021-12-21 12:51:14,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734569314] [2021-12-21 12:51:14,210 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:14,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-21 12:51:14,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:14,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-21 12:51:14,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2021-12-21 12:51:14,211 INFO L87 Difference]: Start difference. First operand 377 states and 399 transitions. Second operand has 30 states, 29 states have (on average 2.8620689655172415) internal successors, (83), 29 states have internal predecessors, (83), 26 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-12-21 12:51:14,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:14,772 INFO L93 Difference]: Finished difference Result 382 states and 403 transitions. [2021-12-21 12:51:14,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-12-21 12:51:14,773 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.8620689655172415) internal successors, (83), 29 states have internal predecessors, (83), 26 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) Word has length 206 [2021-12-21 12:51:14,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:14,774 INFO L225 Difference]: With dead ends: 382 [2021-12-21 12:51:14,774 INFO L226 Difference]: Without dead ends: 377 [2021-12-21 12:51:14,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 187 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=103, Invalid=1087, Unknown=0, NotChecked=0, Total=1190 [2021-12-21 12:51:14,776 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 2 mSDsluCounter, 2324 mSDsCounter, 0 mSdLazyCounter, 1437 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2434 SdHoareTripleChecker+Invalid, 1437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:14,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2434 Invalid, 1437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1437 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-21 12:51:14,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-12-21 12:51:14,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2021-12-21 12:51:14,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 283 states have (on average 1.0777385159010602) internal successors, (305), 283 states have internal predecessors, (305), 47 states have call successors, (47), 47 states have call predecessors, (47), 46 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2021-12-21 12:51:14,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 398 transitions. [2021-12-21 12:51:14,803 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 398 transitions. Word has length 206 [2021-12-21 12:51:14,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:14,803 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 398 transitions. [2021-12-21 12:51:14,804 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 2.8620689655172415) internal successors, (83), 29 states have internal predecessors, (83), 26 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-12-21 12:51:14,804 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 398 transitions. [2021-12-21 12:51:14,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-12-21 12:51:14,805 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:14,805 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:14,813 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:15,011 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:15,011 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:15,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:15,012 INFO L85 PathProgramCache]: Analyzing trace with hash -1619319854, now seen corresponding path program 25 times [2021-12-21 12:51:15,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:15,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895073699] [2021-12-21 12:51:15,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:15,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:15,019 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:15,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1481806338] [2021-12-21 12:51:15,019 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:51:15,019 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:15,020 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:15,020 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:15,021 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-12-21 12:51:15,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:51:15,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 584 conjuncts, 108 conjunts are in the unsatisfiable core [2021-12-21 12:51:15,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:16,647 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 52 proven. 1300 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2021-12-21 12:51:16,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:16,840 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:16,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895073699] [2021-12-21 12:51:16,840 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:16,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1481806338] [2021-12-21 12:51:16,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1481806338] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:16,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:16,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2021-12-21 12:51:16,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840286701] [2021-12-21 12:51:16,841 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:16,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-21 12:51:16,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:16,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-21 12:51:16,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2021-12-21 12:51:16,842 INFO L87 Difference]: Start difference. First operand 377 states and 398 transitions. Second operand has 31 states, 30 states have (on average 2.8666666666666667) internal successors, (86), 30 states have internal predecessors, (86), 27 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-12-21 12:51:17,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:17,603 INFO L93 Difference]: Finished difference Result 382 states and 402 transitions. [2021-12-21 12:51:17,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-21 12:51:17,604 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.8666666666666667) internal successors, (86), 30 states have internal predecessors, (86), 27 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) Word has length 214 [2021-12-21 12:51:17,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:17,605 INFO L225 Difference]: With dead ends: 382 [2021-12-21 12:51:17,605 INFO L226 Difference]: Without dead ends: 377 [2021-12-21 12:51:17,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 194 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=106, Invalid=1154, Unknown=0, NotChecked=0, Total=1260 [2021-12-21 12:51:17,606 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 2 mSDsluCounter, 2494 mSDsCounter, 0 mSdLazyCounter, 1546 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2608 SdHoareTripleChecker+Invalid, 1546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:17,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2608 Invalid, 1546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1546 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-21 12:51:17,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-12-21 12:51:17,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2021-12-21 12:51:17,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 283 states have (on average 1.0742049469964665) internal successors, (304), 283 states have internal predecessors, (304), 47 states have call successors, (47), 47 states have call predecessors, (47), 46 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2021-12-21 12:51:17,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 397 transitions. [2021-12-21 12:51:17,618 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 397 transitions. Word has length 214 [2021-12-21 12:51:17,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:17,619 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 397 transitions. [2021-12-21 12:51:17,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 2.8666666666666667) internal successors, (86), 30 states have internal predecessors, (86), 27 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-12-21 12:51:17,619 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 397 transitions. [2021-12-21 12:51:17,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2021-12-21 12:51:17,620 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:17,620 INFO L514 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:17,643 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:17,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:17,827 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:17,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:17,827 INFO L85 PathProgramCache]: Analyzing trace with hash -252643784, now seen corresponding path program 26 times [2021-12-21 12:51:17,827 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:17,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749413644] [2021-12-21 12:51:17,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:17,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:17,833 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:17,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [143336789] [2021-12-21 12:51:17,834 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:51:17,834 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:17,834 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:17,835 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:17,836 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-12-21 12:51:19,080 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:51:19,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:19,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 605 conjuncts, 112 conjunts are in the unsatisfiable core [2021-12-21 12:51:19,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:19,962 INFO L134 CoverageAnalysis]: Checked inductivity of 2862 backedges. 54 proven. 1404 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2021-12-21 12:51:19,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:20,160 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:20,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749413644] [2021-12-21 12:51:20,160 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:20,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143336789] [2021-12-21 12:51:20,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [143336789] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:20,160 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:20,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2021-12-21 12:51:20,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265258268] [2021-12-21 12:51:20,161 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:20,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-21 12:51:20,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:20,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-21 12:51:20,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2021-12-21 12:51:20,162 INFO L87 Difference]: Start difference. First operand 377 states and 397 transitions. Second operand has 32 states, 31 states have (on average 2.870967741935484) internal successors, (89), 31 states have internal predecessors, (89), 28 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-12-21 12:51:20,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:20,921 INFO L93 Difference]: Finished difference Result 382 states and 401 transitions. [2021-12-21 12:51:20,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-12-21 12:51:20,923 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.870967741935484) internal successors, (89), 31 states have internal predecessors, (89), 28 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) Word has length 222 [2021-12-21 12:51:20,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:20,925 INFO L225 Difference]: With dead ends: 382 [2021-12-21 12:51:20,925 INFO L226 Difference]: Without dead ends: 377 [2021-12-21 12:51:20,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 201 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=1223, Unknown=0, NotChecked=0, Total=1332 [2021-12-21 12:51:20,926 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 2 mSDsluCounter, 2670 mSDsCounter, 0 mSdLazyCounter, 1659 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2788 SdHoareTripleChecker+Invalid, 1659 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1659 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:20,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2788 Invalid, 1659 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1659 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-21 12:51:20,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-12-21 12:51:20,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2021-12-21 12:51:20,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 283 states have (on average 1.0706713780918728) internal successors, (303), 283 states have internal predecessors, (303), 47 states have call successors, (47), 47 states have call predecessors, (47), 46 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2021-12-21 12:51:20,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 396 transitions. [2021-12-21 12:51:20,939 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 396 transitions. Word has length 222 [2021-12-21 12:51:20,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:20,939 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 396 transitions. [2021-12-21 12:51:20,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.870967741935484) internal successors, (89), 31 states have internal predecessors, (89), 28 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-12-21 12:51:20,940 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 396 transitions. [2021-12-21 12:51:20,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2021-12-21 12:51:20,941 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:20,941 INFO L514 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 28, 27, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:20,963 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-12-21 12:51:21,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-12-21 12:51:21,147 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:21,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:21,148 INFO L85 PathProgramCache]: Analyzing trace with hash 867762846, now seen corresponding path program 27 times [2021-12-21 12:51:21,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:21,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009772222] [2021-12-21 12:51:21,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:21,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:21,156 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:21,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [95032570] [2021-12-21 12:51:21,156 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:51:21,156 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:21,157 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:21,172 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:21,173 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-12-21 12:51:26,041 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-12-21 12:51:26,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:26,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 626 conjuncts, 116 conjunts are in the unsatisfiable core [2021-12-21 12:51:26,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:26,876 INFO L134 CoverageAnalysis]: Checked inductivity of 3080 backedges. 56 proven. 1512 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2021-12-21 12:51:26,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:27,023 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:27,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009772222] [2021-12-21 12:51:27,023 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:27,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95032570] [2021-12-21 12:51:27,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95032570] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:27,023 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:27,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2021-12-21 12:51:27,024 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810997484] [2021-12-21 12:51:27,024 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:27,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-21 12:51:27,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:27,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-21 12:51:27,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2021-12-21 12:51:27,025 INFO L87 Difference]: Start difference. First operand 377 states and 396 transitions. Second operand has 33 states, 32 states have (on average 2.875) internal successors, (92), 32 states have internal predecessors, (92), 29 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2021-12-21 12:51:27,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:27,715 INFO L93 Difference]: Finished difference Result 382 states and 400 transitions. [2021-12-21 12:51:27,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-21 12:51:27,716 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.875) internal successors, (92), 32 states have internal predecessors, (92), 29 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) Word has length 230 [2021-12-21 12:51:27,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:27,717 INFO L225 Difference]: With dead ends: 382 [2021-12-21 12:51:27,717 INFO L226 Difference]: Without dead ends: 377 [2021-12-21 12:51:27,718 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 208 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=1294, Unknown=0, NotChecked=0, Total=1406 [2021-12-21 12:51:27,719 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 2 mSDsluCounter, 2852 mSDsCounter, 0 mSdLazyCounter, 1776 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2974 SdHoareTripleChecker+Invalid, 1776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1776 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:27,719 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2974 Invalid, 1776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1776 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-21 12:51:27,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-12-21 12:51:27,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2021-12-21 12:51:27,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 283 states have (on average 1.0671378091872792) internal successors, (302), 283 states have internal predecessors, (302), 47 states have call successors, (47), 47 states have call predecessors, (47), 46 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2021-12-21 12:51:27,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 395 transitions. [2021-12-21 12:51:27,732 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 395 transitions. Word has length 230 [2021-12-21 12:51:27,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:27,733 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 395 transitions. [2021-12-21 12:51:27,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 2.875) internal successors, (92), 32 states have internal predecessors, (92), 29 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2021-12-21 12:51:27,733 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 395 transitions. [2021-12-21 12:51:27,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-12-21 12:51:27,735 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:27,735 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:27,757 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:27,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-12-21 12:51:27,943 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:27,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:27,944 INFO L85 PathProgramCache]: Analyzing trace with hash 1996048644, now seen corresponding path program 28 times [2021-12-21 12:51:27,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:27,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443276132] [2021-12-21 12:51:27,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:27,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:27,951 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:27,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2063596214] [2021-12-21 12:51:27,951 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:51:27,951 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:27,952 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:27,952 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:27,953 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-12-21 12:51:33,601 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:51:33,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:33,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 120 conjunts are in the unsatisfiable core [2021-12-21 12:51:33,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:34,514 INFO L134 CoverageAnalysis]: Checked inductivity of 3306 backedges. 58 proven. 1624 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2021-12-21 12:51:34,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:34,780 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:34,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443276132] [2021-12-21 12:51:34,780 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:34,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063596214] [2021-12-21 12:51:34,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063596214] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:34,780 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:34,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2021-12-21 12:51:34,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384935044] [2021-12-21 12:51:34,781 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:34,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-21 12:51:34,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:34,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-21 12:51:34,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2021-12-21 12:51:34,782 INFO L87 Difference]: Start difference. First operand 377 states and 395 transitions. Second operand has 34 states, 33 states have (on average 2.878787878787879) internal successors, (95), 33 states have internal predecessors, (95), 30 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 29 states have call predecessors, (29), 29 states have call successors, (29) [2021-12-21 12:51:35,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:35,631 INFO L93 Difference]: Finished difference Result 382 states and 399 transitions. [2021-12-21 12:51:35,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-12-21 12:51:35,632 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 2.878787878787879) internal successors, (95), 33 states have internal predecessors, (95), 30 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 29 states have call predecessors, (29), 29 states have call successors, (29) Word has length 238 [2021-12-21 12:51:35,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:35,648 INFO L225 Difference]: With dead ends: 382 [2021-12-21 12:51:35,649 INFO L226 Difference]: Without dead ends: 377 [2021-12-21 12:51:35,649 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=115, Invalid=1367, Unknown=0, NotChecked=0, Total=1482 [2021-12-21 12:51:35,650 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 2 mSDsluCounter, 3040 mSDsCounter, 0 mSdLazyCounter, 1897 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 3166 SdHoareTripleChecker+Invalid, 1897 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1897 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:35,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 3166 Invalid, 1897 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1897 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-12-21 12:51:35,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-12-21 12:51:35,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2021-12-21 12:51:35,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 283 states have (on average 1.0636042402826855) internal successors, (301), 283 states have internal predecessors, (301), 47 states have call successors, (47), 47 states have call predecessors, (47), 46 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2021-12-21 12:51:35,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 394 transitions. [2021-12-21 12:51:35,684 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 394 transitions. Word has length 238 [2021-12-21 12:51:35,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:35,685 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 394 transitions. [2021-12-21 12:51:35,685 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 2.878787878787879) internal successors, (95), 33 states have internal predecessors, (95), 30 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 29 states have call predecessors, (29), 29 states have call successors, (29) [2021-12-21 12:51:35,685 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 394 transitions. [2021-12-21 12:51:35,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2021-12-21 12:51:35,686 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:35,686 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:35,698 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:35,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-12-21 12:51:35,887 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:35,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:35,887 INFO L85 PathProgramCache]: Analyzing trace with hash 1138215274, now seen corresponding path program 29 times [2021-12-21 12:51:35,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:35,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176008719] [2021-12-21 12:51:35,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:35,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:35,896 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:35,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1149500583] [2021-12-21 12:51:35,897 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:51:35,897 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:35,897 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:35,906 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:35,908 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process