./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e19ca921 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_valuebound100.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 787aa3251fe70c0757344936f9e5c92841f1fb61138cb758df556e9684a50783 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 11:11:43,061 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 11:11:43,063 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 11:11:43,095 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 11:11:43,096 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 11:11:43,097 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 11:11:43,098 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 11:11:43,099 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 11:11:43,101 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 11:11:43,102 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 11:11:43,103 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 11:11:43,104 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 11:11:43,104 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 11:11:43,105 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 11:11:43,106 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 11:11:43,107 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 11:11:43,107 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 11:11:43,108 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 11:11:43,110 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 11:11:43,111 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 11:11:43,112 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 11:11:43,114 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 11:11:43,115 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 11:11:43,119 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 11:11:43,121 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 11:11:43,121 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 11:11:43,125 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 11:11:43,126 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 11:11:43,126 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 11:11:43,127 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 11:11:43,127 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 11:11:43,128 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 11:11:43,129 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 11:11:43,130 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 11:11:43,131 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 11:11:43,132 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 11:11:43,133 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 11:11:43,133 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 11:11:43,133 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 11:11:43,134 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 11:11:43,135 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 11:11:43,136 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-22 11:11:43,169 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 11:11:43,169 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 11:11:43,170 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 11:11:43,170 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 11:11:43,170 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 11:11:43,171 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 11:11:43,171 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 11:11:43,171 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 11:11:43,172 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 11:11:43,172 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 11:11:43,172 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 11:11:43,173 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 11:11:43,173 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 11:11:43,173 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 11:11:43,173 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-22 11:11:43,173 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 11:11:43,174 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-22 11:11:43,174 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 11:11:43,174 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-22 11:11:43,174 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 11:11:43,174 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-22 11:11:43,174 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 11:11:43,175 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 11:11:43,175 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 11:11:43,175 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 11:11:43,175 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 11:11:43,175 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 11:11:43,177 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-22 11:11:43,177 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 11:11:43,177 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 11:11:43,177 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-22 11:11:43,178 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-22 11:11:43,178 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-22 11:11:43,178 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 11:11:43,178 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 787aa3251fe70c0757344936f9e5c92841f1fb61138cb758df556e9684a50783 [2021-12-22 11:11:43,391 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 11:11:43,408 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 11:11:43,410 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 11:11:43,411 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 11:11:43,412 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 11:11:43,413 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound100.c [2021-12-22 11:11:43,468 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/245160d25/49a0d54338064e4ba127e6c5e653742c/FLAGa07cf3c36 [2021-12-22 11:11:43,763 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 11:11:43,763 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_valuebound100.c [2021-12-22 11:11:43,768 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/245160d25/49a0d54338064e4ba127e6c5e653742c/FLAGa07cf3c36 [2021-12-22 11:11:44,193 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/245160d25/49a0d54338064e4ba127e6c5e653742c [2021-12-22 11:11:44,197 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 11:11:44,198 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 11:11:44,199 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 11:11:44,199 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 11:11:44,204 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 11:11:44,205 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,206 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5863f9fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44, skipping insertion in model container [2021-12-22 11:11:44,206 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,212 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 11:11:44,225 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 11:11:44,363 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_valuebound100.c[458,471] [2021-12-22 11:11:44,378 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 11:11:44,388 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 11:11:44,404 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_valuebound100.c[458,471] [2021-12-22 11:11:44,408 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 11:11:44,418 INFO L208 MainTranslator]: Completed translation [2021-12-22 11:11:44,419 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44 WrapperNode [2021-12-22 11:11:44,419 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 11:11:44,420 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 11:11:44,420 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 11:11:44,420 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 11:11:44,426 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,432 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,449 INFO L137 Inliner]: procedures = 14, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 38 [2021-12-22 11:11:44,449 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 11:11:44,450 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 11:11:44,450 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 11:11:44,451 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 11:11:44,457 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,457 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,467 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,467 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,475 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,479 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,482 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,484 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 11:11:44,487 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 11:11:44,487 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 11:11:44,487 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 11:11:44,488 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44" (1/1) ... [2021-12-22 11:11:44,493 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 11:11:44,501 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:11:44,509 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) [2021-12-22 11:11:44,510 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 [2021-12-22 11:11:44,537 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 11:11:44,537 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-22 11:11:44,538 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 11:11:44,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 11:11:44,539 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-22 11:11:44,539 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-22 11:11:44,584 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 11:11:44,585 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 11:11:44,664 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 11:11:44,669 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 11:11:44,669 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-22 11:11:44,671 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 11:11:44 BoogieIcfgContainer [2021-12-22 11:11:44,671 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 11:11:44,673 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 11:11:44,673 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 11:11:44,676 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 11:11:44,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 11:11:44" (1/3) ... [2021-12-22 11:11:44,676 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c36130b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 11:11:44, skipping insertion in model container [2021-12-22 11:11:44,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:11:44" (2/3) ... [2021-12-22 11:11:44,677 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c36130b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 11:11:44, skipping insertion in model container [2021-12-22 11:11:44,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 11:11:44" (3/3) ... [2021-12-22 11:11:44,678 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll_valuebound100.c [2021-12-22 11:11:44,683 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 11:11:44,683 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-22 11:11:44,718 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 11:11:44,725 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 [2021-12-22 11:11:44,725 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-22 11:11:44,738 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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) [2021-12-22 11:11:44,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-22 11:11:44,741 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:11:44,742 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:11:44,742 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:11:44,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:11:44,747 INFO L85 PathProgramCache]: Analyzing trace with hash -589436290, now seen corresponding path program 1 times [2021-12-22 11:11:44,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:11:44,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850515467] [2021-12-22 11:11:44,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:11:44,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:11:44,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:11:44,877 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 11:11:44,878 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:11:44,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850515467] [2021-12-22 11:11:44,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [850515467] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 11:11:44,880 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 11:11:44,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 11:11:44,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664973178] [2021-12-22 11:11:44,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 11:11:44,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-22 11:11:44,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:11:44,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-22 11:11:44,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-22 11:11:44,917 INFO L87 Difference]: Start difference. First operand has 19 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2021-12-22 11:11:44,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:11:44,937 INFO L93 Difference]: Finished difference Result 35 states and 49 transitions. [2021-12-22 11:11:44,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-22 11:11:44,940 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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 9 [2021-12-22 11:11:44,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:11:44,946 INFO L225 Difference]: With dead ends: 35 [2021-12-22 11:11:44,946 INFO L226 Difference]: Without dead ends: 15 [2021-12-22 11:11:44,949 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 [2021-12-22 11:11:44,955 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 [2021-12-22 11:11:44,956 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] [2021-12-22 11:11:44,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-12-22 11:11:45,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-12-22 11:11:45,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 11 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) [2021-12-22 11:11:45,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-12-22 11:11:45,017 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2021-12-22 11:11:45,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:11:45,017 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-12-22 11:11:45,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2021-12-22 11:11:45,018 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-12-22 11:11:45,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-22 11:11:45,018 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:11:45,019 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:11:45,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-22 11:11:45,020 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:11:45,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:11:45,024 INFO L85 PathProgramCache]: Analyzing trace with hash 1187358532, now seen corresponding path program 1 times [2021-12-22 11:11:45,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:11:45,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934467852] [2021-12-22 11:11:45,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:11:45,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:11:45,041 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:11:45,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [593959534] [2021-12-22 11:11:45,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:11:45,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:11:45,046 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:11:45,051 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) [2021-12-22 11:11:45,095 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-22 11:11:45,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:11:45,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-22 11:11:45,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:11:45,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 11:11:45,184 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 11:11:45,184 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:11:45,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934467852] [2021-12-22 11:11:45,185 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:11:45,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593959534] [2021-12-22 11:11:45,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [593959534] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 11:11:45,185 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 11:11:45,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 11:11:45,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879064565] [2021-12-22 11:11:45,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 11:11:45,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 11:11:45,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:11:45,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 11:11:45,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 11:11:45,188 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-12-22 11:11:45,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:11:45,233 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-12-22 11:11:45,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 11:11:45,233 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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 9 [2021-12-22 11:11:45,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:11:45,234 INFO L225 Difference]: With dead ends: 26 [2021-12-22 11:11:45,234 INFO L226 Difference]: Without dead ends: 22 [2021-12-22 11:11:45,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-22 11:11:45,236 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 11:11:45,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 51 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 11:11:45,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-12-22 11:11:45,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-12-22 11:11:45,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 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) [2021-12-22 11:11:45,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-12-22 11:11:45,243 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 9 [2021-12-22 11:11:45,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:11:45,244 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-12-22 11:11:45,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-12-22 11:11:45,244 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-12-22 11:11:45,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-22 11:11:45,245 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:11:45,245 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:11:45,271 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-22 11:11:45,471 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 [2021-12-22 11:11:45,472 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:11:45,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:11:45,472 INFO L85 PathProgramCache]: Analyzing trace with hash -1781398469, now seen corresponding path program 1 times [2021-12-22 11:11:45,473 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:11:45,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810880336] [2021-12-22 11:11:45,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:11:45,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:11:45,490 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:11:45,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [142232124] [2021-12-22 11:11:45,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:11:45,491 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:11:45,491 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:11:45,492 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) [2021-12-22 11:11:45,495 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-22 11:11:45,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:11:45,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-22 11:11:45,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:11:45,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 11:11:45,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:01,587 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-22 11:12:01,587 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:01,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810880336] [2021-12-22 11:12:01,587 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:01,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142232124] [2021-12-22 11:12:01,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142232124] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:01,588 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:01,588 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-12-22 11:12:01,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335172262] [2021-12-22 11:12:01,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 11:12:01,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 11:12:01,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:01,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 11:12:01,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=28, Unknown=1, NotChecked=0, Total=42 [2021-12-22 11:12:01,590 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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) [2021-12-22 11:12:01,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:01,632 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-12-22 11:12:01,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 11:12:01,632 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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 [2021-12-22 11:12:01,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:01,633 INFO L225 Difference]: With dead ends: 28 [2021-12-22 11:12:01,633 INFO L226 Difference]: Without dead ends: 23 [2021-12-22 11:12:01,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=17, Invalid=38, Unknown=1, NotChecked=0, Total=56 [2021-12-22 11:12:01,635 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:01,635 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 44 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 11:12:01,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-12-22 11:12:01,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-12-22 11:12:01,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 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) [2021-12-22 11:12:01,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2021-12-22 11:12:01,641 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 16 [2021-12-22 11:12:01,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:01,641 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2021-12-22 11:12:01,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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) [2021-12-22 11:12:01,642 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2021-12-22 11:12:01,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-22 11:12:01,643 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:01,643 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:01,675 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:01,866 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 [2021-12-22 11:12:01,866 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:01,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:01,867 INFO L85 PathProgramCache]: Analyzing trace with hash -1711372296, now seen corresponding path program 1 times [2021-12-22 11:12:01,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:01,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319594374] [2021-12-22 11:12:01,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:01,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:01,876 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:01,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2104319196] [2021-12-22 11:12:01,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:01,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:01,877 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:01,878 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) [2021-12-22 11:12:01,912 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-22 11:12:01,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:12:01,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-22 11:12:01,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:02,148 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-22 11:12:02,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:02,308 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:02,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319594374] [2021-12-22 11:12:02,309 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:02,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104319196] [2021-12-22 11:12:02,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104319196] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:02,309 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:02,309 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-12-22 11:12:02,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330359327] [2021-12-22 11:12:02,309 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:02,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 11:12:02,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:02,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 11:12:02,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-12-22 11:12:02,311 INFO L87 Difference]: Start difference. First operand 23 states and 23 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) [2021-12-22 11:12:02,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:02,368 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2021-12-22 11:12:02,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 11:12:02,369 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 [2021-12-22 11:12:02,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:02,370 INFO L225 Difference]: With dead ends: 31 [2021-12-22 11:12:02,370 INFO L226 Difference]: Without dead ends: 26 [2021-12-22 11:12:02,370 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-12-22 11:12:02,371 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 2 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:02,372 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 81 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 11:12:02,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-12-22 11:12:02,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-12-22 11:12:02,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 11:12:02,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-12-22 11:12:02,384 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2021-12-22 11:12:02,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:02,385 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-12-22 11:12:02,385 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) [2021-12-22 11:12:02,385 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-12-22 11:12:02,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-22 11:12:02,387 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:02,390 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:02,412 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:02,603 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 [2021-12-22 11:12:02,603 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:02,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:02,604 INFO L85 PathProgramCache]: Analyzing trace with hash -1075497887, now seen corresponding path program 2 times [2021-12-22 11:12:02,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:02,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323507086] [2021-12-22 11:12:02,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:02,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:02,614 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:02,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1235170707] [2021-12-22 11:12:02,614 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 11:12:02,614 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:02,615 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:02,619 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) [2021-12-22 11:12:02,627 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-22 11:12:02,660 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 11:12:02,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:02,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-22 11:12:02,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:02,835 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-22 11:12:02,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:02,971 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:02,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323507086] [2021-12-22 11:12:02,972 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:02,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235170707] [2021-12-22 11:12:02,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235170707] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:02,972 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:02,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-12-22 11:12:02,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884318932] [2021-12-22 11:12:02,972 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:02,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-22 11:12:02,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:02,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-22 11:12:02,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-12-22 11:12:02,974 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 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) [2021-12-22 11:12:03,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:03,052 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-12-22 11:12:03,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 11:12:03,053 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 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 29 [2021-12-22 11:12:03,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:03,056 INFO L225 Difference]: With dead ends: 34 [2021-12-22 11:12:03,056 INFO L226 Difference]: Without dead ends: 29 [2021-12-22 11:12:03,057 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-12-22 11:12:03,060 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 2 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:03,060 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 109 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 11:12:03,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-12-22 11:12:03,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-12-22 11:12:03,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 11:12:03,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-12-22 11:12:03,072 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 29 [2021-12-22 11:12:03,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:03,072 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-12-22 11:12:03,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 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) [2021-12-22 11:12:03,073 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-12-22 11:12:03,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-22 11:12:03,074 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:03,074 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:03,099 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:03,296 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 [2021-12-22 11:12:03,297 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:03,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:03,297 INFO L85 PathProgramCache]: Analyzing trace with hash 817917912, now seen corresponding path program 3 times [2021-12-22 11:12:03,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:03,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685507697] [2021-12-22 11:12:03,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:03,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:03,306 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:03,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1368627776] [2021-12-22 11:12:03,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-22 11:12:03,306 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:03,306 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:03,312 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) [2021-12-22 11:12:03,317 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-22 11:12:03,369 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-22 11:12:03,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:03,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-22 11:12:03,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:03,642 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-22 11:12:03,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:07,919 WARN L838 $PredicateComparison]: unable to prove that (or (not (= (mod (+ (* (- 1) |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* (- 1) |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| (- 2))) 4) 0)) (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (let ((.cse0 (+ |c_ULTIMATE.start_main_~y~0#1| 1))) (= (* |ULTIMATE.start_main_~k~0#1| .cse0) (* .cse0 .cse0))) (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|)))) is different from false [2021-12-22 11:12:07,921 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:07,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685507697] [2021-12-22 11:12:07,921 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:07,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368627776] [2021-12-22 11:12:07,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368627776] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:07,921 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:07,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-12-22 11:12:07,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851788082] [2021-12-22 11:12:07,922 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:07,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-22 11:12:07,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:07,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-22 11:12:07,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=251, Unknown=1, NotChecked=32, Total=342 [2021-12-22 11:12:07,923 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 13 states, 12 states have (on average 1.75) internal successors, (21), 10 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 11:12:08,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:08,100 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-12-22 11:12:08,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-22 11:12:08,101 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 10 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 36 [2021-12-22 11:12:08,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:08,102 INFO L225 Difference]: With dead ends: 41 [2021-12-22 11:12:08,102 INFO L226 Difference]: Without dead ends: 36 [2021-12-22 11:12:08,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=79, Invalid=344, Unknown=1, NotChecked=38, Total=462 [2021-12-22 11:12:08,103 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 12 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:08,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 131 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 11:12:08,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-22 11:12:08,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-12-22 11:12:08,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-22 11:12:08,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-12-22 11:12:08,110 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 36 [2021-12-22 11:12:08,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:08,110 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-12-22 11:12:08,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 10 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 11:12:08,111 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-12-22 11:12:08,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-22 11:12:08,112 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:08,112 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:08,139 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:08,328 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 [2021-12-22 11:12:08,328 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:08,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:08,329 INFO L85 PathProgramCache]: Analyzing trace with hash 1384689793, now seen corresponding path program 4 times [2021-12-22 11:12:08,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:08,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838624305] [2021-12-22 11:12:08,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:08,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:08,337 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:08,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1266951393] [2021-12-22 11:12:08,337 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-22 11:12:08,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:08,338 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:08,339 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) [2021-12-22 11:12:08,340 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-22 11:12:08,400 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-22 11:12:08,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:08,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-22 11:12:08,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:08,610 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-12-22 11:12:08,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:08,757 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:08,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838624305] [2021-12-22 11:12:08,758 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:08,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266951393] [2021-12-22 11:12:08,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1266951393] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:08,758 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:08,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-12-22 11:12:08,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343979821] [2021-12-22 11:12:08,758 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:08,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-22 11:12:08,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:08,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-22 11:12:08,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-12-22 11:12:08,759 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 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) [2021-12-22 11:12:08,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:08,868 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2021-12-22 11:12:08,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-22 11:12:08,869 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 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 43 [2021-12-22 11:12:08,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:08,869 INFO L225 Difference]: With dead ends: 44 [2021-12-22 11:12:08,869 INFO L226 Difference]: Without dead ends: 39 [2021-12-22 11:12:08,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-12-22 11:12:08,870 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 2 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:08,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 177 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 11:12:08,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-12-22 11:12:08,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-12-22 11:12:08,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-22 11:12:08,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-12-22 11:12:08,877 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 43 [2021-12-22 11:12:08,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:08,877 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-12-22 11:12:08,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 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) [2021-12-22 11:12:08,896 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-12-22 11:12:08,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-22 11:12:08,897 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:08,897 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:08,926 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:09,111 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 [2021-12-22 11:12:09,112 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:09,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:09,112 INFO L85 PathProgramCache]: Analyzing trace with hash -23130184, now seen corresponding path program 5 times [2021-12-22 11:12:09,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:09,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322214290] [2021-12-22 11:12:09,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:09,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:09,121 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:09,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1022024282] [2021-12-22 11:12:09,121 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-22 11:12:09,121 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:09,121 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:09,123 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) [2021-12-22 11:12:09,124 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-22 11:12:09,196 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-22 11:12:09,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:09,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-22 11:12:09,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:09,461 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-12-22 11:12:09,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:09,853 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:09,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322214290] [2021-12-22 11:12:09,853 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:09,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022024282] [2021-12-22 11:12:09,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1022024282] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:09,855 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:09,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-12-22 11:12:09,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140463123] [2021-12-22 11:12:09,856 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:09,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-22 11:12:09,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:09,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-22 11:12:09,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-12-22 11:12:09,858 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 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) [2021-12-22 11:12:09,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:09,991 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2021-12-22 11:12:09,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-22 11:12:09,995 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 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 50 [2021-12-22 11:12:09,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:09,996 INFO L225 Difference]: With dead ends: 47 [2021-12-22 11:12:09,996 INFO L226 Difference]: Without dead ends: 42 [2021-12-22 11:12:09,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-12-22 11:12:09,997 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 2 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:09,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 217 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 11:12:09,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-12-22 11:12:10,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-12-22 11:12:10,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-22 11:12:10,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-12-22 11:12:10,004 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 50 [2021-12-22 11:12:10,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:10,004 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-12-22 11:12:10,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 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) [2021-12-22 11:12:10,005 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-12-22 11:12:10,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-22 11:12:10,006 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:10,006 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:10,032 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:10,229 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 [2021-12-22 11:12:10,230 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:10,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:10,230 INFO L85 PathProgramCache]: Analyzing trace with hash -1898941279, now seen corresponding path program 6 times [2021-12-22 11:12:10,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:10,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378959726] [2021-12-22 11:12:10,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:10,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:10,238 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:10,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [338478624] [2021-12-22 11:12:10,238 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-22 11:12:10,238 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:10,238 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:10,239 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) [2021-12-22 11:12:10,240 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-22 11:12:10,297 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-12-22 11:12:10,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:10,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-22 11:12:10,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:10,561 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 63 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-22 11:12:10,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:10,817 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:10,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378959726] [2021-12-22 11:12:10,817 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:10,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338478624] [2021-12-22 11:12:10,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338478624] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:10,818 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:10,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-12-22 11:12:10,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264734909] [2021-12-22 11:12:10,818 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:10,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-22 11:12:10,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:10,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-22 11:12:10,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-12-22 11:12:10,819 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 12 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 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) [2021-12-22 11:12:10,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:10,979 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2021-12-22 11:12:10,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-22 11:12:10,979 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 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 57 [2021-12-22 11:12:10,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:10,980 INFO L225 Difference]: With dead ends: 50 [2021-12-22 11:12:10,980 INFO L226 Difference]: Without dead ends: 45 [2021-12-22 11:12:10,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-12-22 11:12:10,981 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 2 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:10,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 261 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 11:12:10,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-12-22 11:12:10,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-12-22 11:12:10,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 11:12:10,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2021-12-22 11:12:10,989 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 57 [2021-12-22 11:12:10,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:10,989 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2021-12-22 11:12:10,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 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) [2021-12-22 11:12:10,990 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2021-12-22 11:12:10,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-12-22 11:12:10,990 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:10,990 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:11,014 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:11,203 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 [2021-12-22 11:12:11,203 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:11,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:11,204 INFO L85 PathProgramCache]: Analyzing trace with hash 385378200, now seen corresponding path program 7 times [2021-12-22 11:12:11,204 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:11,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051143822] [2021-12-22 11:12:11,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:11,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:11,211 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:11,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [83107491] [2021-12-22 11:12:11,211 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-22 11:12:11,211 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:11,211 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:11,224 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) [2021-12-22 11:12:11,228 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-22 11:12:11,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:12:11,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-22 11:12:11,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:11,820 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-12-22 11:12:11,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:12,046 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:12,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051143822] [2021-12-22 11:12:12,046 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:12,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [83107491] [2021-12-22 11:12:12,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [83107491] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:12,046 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:12,046 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-12-22 11:12:12,047 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106873476] [2021-12-22 11:12:12,047 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:12,047 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-22 11:12:12,047 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:12,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-22 11:12:12,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-12-22 11:12:12,048 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 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) [2021-12-22 11:12:12,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:12,222 INFO L93 Difference]: Finished difference Result 53 states and 59 transitions. [2021-12-22 11:12:12,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-22 11:12:12,223 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 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 64 [2021-12-22 11:12:12,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:12,223 INFO L225 Difference]: With dead ends: 53 [2021-12-22 11:12:12,223 INFO L226 Difference]: Without dead ends: 48 [2021-12-22 11:12:12,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-12-22 11:12:12,224 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 2 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:12,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 309 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 11:12:12,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-12-22 11:12:12,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-12-22 11:12:12,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 11:12:12,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2021-12-22 11:12:12,231 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 64 [2021-12-22 11:12:12,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:12,232 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2021-12-22 11:12:12,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 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) [2021-12-22 11:12:12,232 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2021-12-22 11:12:12,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-12-22 11:12:12,233 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:12,233 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:12,239 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:12,438 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 [2021-12-22 11:12:12,439 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:12,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:12,439 INFO L85 PathProgramCache]: Analyzing trace with hash 2073985217, now seen corresponding path program 8 times [2021-12-22 11:12:12,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:12,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953892404] [2021-12-22 11:12:12,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:12,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:12,447 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:12,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1219090447] [2021-12-22 11:12:12,447 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 11:12:12,447 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:12,447 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:12,448 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) [2021-12-22 11:12:12,454 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-22 11:12:12,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 11:12:12,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:12,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-22 11:12:12,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:13,028 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 18 proven. 108 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-12-22 11:12:13,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:13,191 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:13,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953892404] [2021-12-22 11:12:13,191 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:13,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219090447] [2021-12-22 11:12:13,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219090447] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:13,192 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:13,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-12-22 11:12:13,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438888771] [2021-12-22 11:12:13,192 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:13,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-22 11:12:13,192 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:13,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-22 11:12:13,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-12-22 11:12:13,193 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 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) [2021-12-22 11:12:13,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:13,361 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-12-22 11:12:13,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-22 11:12:13,361 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 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 71 [2021-12-22 11:12:13,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:13,363 INFO L225 Difference]: With dead ends: 56 [2021-12-22 11:12:13,363 INFO L226 Difference]: Without dead ends: 51 [2021-12-22 11:12:13,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-12-22 11:12:13,364 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 2 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:13,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 361 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 11:12:13,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-12-22 11:12:13,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-12-22 11:12:13,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-22 11:12:13,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 58 transitions. [2021-12-22 11:12:13,371 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 58 transitions. Word has length 71 [2021-12-22 11:12:13,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:13,371 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 58 transitions. [2021-12-22 11:12:13,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 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) [2021-12-22 11:12:13,371 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 58 transitions. [2021-12-22 11:12:13,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-12-22 11:12:13,372 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:13,372 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:13,378 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:13,578 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 [2021-12-22 11:12:13,578 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:13,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:13,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1353348984, now seen corresponding path program 9 times [2021-12-22 11:12:13,579 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:13,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820284916] [2021-12-22 11:12:13,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:13,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:13,588 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:13,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1417473000] [2021-12-22 11:12:13,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-22 11:12:13,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:13,588 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:13,590 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) [2021-12-22 11:12:13,591 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-22 11:12:13,889 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-12-22 11:12:13,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:13,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 44 conjunts are in the unsatisfiable core [2021-12-22 11:12:13,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:14,221 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-12-22 11:12:14,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:14,410 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:14,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820284916] [2021-12-22 11:12:14,410 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:14,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417473000] [2021-12-22 11:12:14,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417473000] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:14,410 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:14,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-12-22 11:12:14,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830489045] [2021-12-22 11:12:14,410 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:14,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-22 11:12:14,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:14,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-22 11:12:14,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-12-22 11:12:14,412 INFO L87 Difference]: Start difference. First operand 51 states and 58 transitions. Second operand has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 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) [2021-12-22 11:12:14,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:14,626 INFO L93 Difference]: Finished difference Result 59 states and 67 transitions. [2021-12-22 11:12:14,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-22 11:12:14,627 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 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 78 [2021-12-22 11:12:14,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:14,628 INFO L225 Difference]: With dead ends: 59 [2021-12-22 11:12:14,628 INFO L226 Difference]: Without dead ends: 54 [2021-12-22 11:12:14,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2021-12-22 11:12:14,628 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 2 mSDsluCounter, 376 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 417 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:14,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 417 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 11:12:14,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-22 11:12:14,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-12-22 11:12:14,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-22 11:12:14,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 62 transitions. [2021-12-22 11:12:14,636 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 62 transitions. Word has length 78 [2021-12-22 11:12:14,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:14,637 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 62 transitions. [2021-12-22 11:12:14,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 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) [2021-12-22 11:12:14,637 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 62 transitions. [2021-12-22 11:12:14,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-12-22 11:12:14,638 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:14,638 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:14,646 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-12-22 11:12:14,844 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 [2021-12-22 11:12:14,844 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:14,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:14,845 INFO L85 PathProgramCache]: Analyzing trace with hash 1817498849, now seen corresponding path program 10 times [2021-12-22 11:12:14,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:14,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065000504] [2021-12-22 11:12:14,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:14,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:14,856 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:14,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1419848609] [2021-12-22 11:12:14,856 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-22 11:12:14,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:14,856 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:14,857 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) [2021-12-22 11:12:14,859 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-22 11:12:15,106 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-22 11:12:15,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:15,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-22 11:12:15,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:15,463 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 22 proven. 165 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-12-22 11:12:15,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:15,602 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:15,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065000504] [2021-12-22 11:12:15,602 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:15,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1419848609] [2021-12-22 11:12:15,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1419848609] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:15,603 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:15,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-12-22 11:12:15,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162902370] [2021-12-22 11:12:15,603 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:15,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-22 11:12:15,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:15,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-22 11:12:15,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-12-22 11:12:15,604 INFO L87 Difference]: Start difference. First operand 54 states and 62 transitions. Second operand has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 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) [2021-12-22 11:12:15,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:15,851 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2021-12-22 11:12:15,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-22 11:12:15,851 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 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 85 [2021-12-22 11:12:15,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:15,852 INFO L225 Difference]: With dead ends: 62 [2021-12-22 11:12:15,852 INFO L226 Difference]: Without dead ends: 57 [2021-12-22 11:12:15,852 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-12-22 11:12:15,853 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 2 mSDsluCounter, 433 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:15,853 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 477 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 343 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 11:12:15,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-12-22 11:12:15,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-12-22 11:12:15,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-22 11:12:15,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 66 transitions. [2021-12-22 11:12:15,861 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 66 transitions. Word has length 85 [2021-12-22 11:12:15,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:15,861 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 66 transitions. [2021-12-22 11:12:15,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 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) [2021-12-22 11:12:15,861 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 66 transitions. [2021-12-22 11:12:15,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-12-22 11:12:15,862 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:15,862 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:15,869 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:16,069 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 [2021-12-22 11:12:16,069 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:16,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:16,069 INFO L85 PathProgramCache]: Analyzing trace with hash 638795608, now seen corresponding path program 11 times [2021-12-22 11:12:16,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:16,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521396135] [2021-12-22 11:12:16,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:16,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:16,077 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:16,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [689450747] [2021-12-22 11:12:16,077 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-22 11:12:16,078 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:16,078 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:16,079 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) [2021-12-22 11:12:16,095 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-22 11:12:17,321 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-12-22 11:12:17,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:17,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-22 11:12:17,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:17,658 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 24 proven. 198 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-12-22 11:12:17,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:17,950 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:17,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521396135] [2021-12-22 11:12:17,951 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:17,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689450747] [2021-12-22 11:12:17,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689450747] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:17,951 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:17,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-12-22 11:12:17,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770681396] [2021-12-22 11:12:17,951 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:17,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-22 11:12:17,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:17,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-22 11:12:17,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-12-22 11:12:17,952 INFO L87 Difference]: Start difference. First operand 57 states and 66 transitions. Second operand has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 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) [2021-12-22 11:12:18,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:18,224 INFO L93 Difference]: Finished difference Result 65 states and 75 transitions. [2021-12-22 11:12:18,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-22 11:12:18,225 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 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 92 [2021-12-22 11:12:18,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:18,225 INFO L225 Difference]: With dead ends: 65 [2021-12-22 11:12:18,226 INFO L226 Difference]: Without dead ends: 60 [2021-12-22 11:12:18,226 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2021-12-22 11:12:18,226 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 2 mSDsluCounter, 494 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:18,227 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 541 Invalid, 397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 11:12:18,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-12-22 11:12:18,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-12-22 11:12:18,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 14 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-12-22 11:12:18,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2021-12-22 11:12:18,234 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 92 [2021-12-22 11:12:18,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:18,235 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2021-12-22 11:12:18,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 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) [2021-12-22 11:12:18,235 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2021-12-22 11:12:18,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-12-22 11:12:18,236 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:18,236 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:18,249 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:18,450 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 [2021-12-22 11:12:18,450 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:18,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:18,451 INFO L85 PathProgramCache]: Analyzing trace with hash 550859009, now seen corresponding path program 12 times [2021-12-22 11:12:18,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:18,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183421237] [2021-12-22 11:12:18,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:18,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:18,462 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:18,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [296357293] [2021-12-22 11:12:18,463 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-22 11:12:18,463 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:18,463 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:18,464 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) [2021-12-22 11:12:18,465 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-22 11:12:18,786 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-12-22 11:12:18,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:18,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 56 conjunts are in the unsatisfiable core [2021-12-22 11:12:18,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:19,158 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 26 proven. 234 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-12-22 11:12:19,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:19,294 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:19,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183421237] [2021-12-22 11:12:19,294 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:19,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [296357293] [2021-12-22 11:12:19,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [296357293] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:19,295 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:19,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-12-22 11:12:19,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272501942] [2021-12-22 11:12:19,295 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:19,295 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-22 11:12:19,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:19,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-22 11:12:19,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2021-12-22 11:12:19,296 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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) [2021-12-22 11:12:19,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:19,605 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2021-12-22 11:12:19,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-22 11:12:19,606 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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 99 [2021-12-22 11:12:19,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:19,606 INFO L225 Difference]: With dead ends: 68 [2021-12-22 11:12:19,606 INFO L226 Difference]: Without dead ends: 63 [2021-12-22 11:12:19,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-12-22 11:12:19,607 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 2 mSDsluCounter, 559 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 609 SdHoareTripleChecker+Invalid, 455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:19,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 609 Invalid, 455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 11:12:19,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-12-22 11:12:19,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-12-22 11:12:19,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 15 states have call successors, (15), 4 states have call predecessors, (15), 3 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-12-22 11:12:19,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2021-12-22 11:12:19,619 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 99 [2021-12-22 11:12:19,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:19,620 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2021-12-22 11:12:19,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 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) [2021-12-22 11:12:19,620 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2021-12-22 11:12:19,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-12-22 11:12:19,621 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:19,621 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:19,630 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:19,827 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 [2021-12-22 11:12:19,828 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:19,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:19,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1794064584, now seen corresponding path program 13 times [2021-12-22 11:12:19,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:19,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801113398] [2021-12-22 11:12:19,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:19,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:19,836 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:19,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [799967638] [2021-12-22 11:12:19,847 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-22 11:12:19,847 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:19,848 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:19,849 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) [2021-12-22 11:12:19,857 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-22 11:12:21,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:12:21,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-22 11:12:21,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:21,426 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 28 proven. 273 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-12-22 11:12:21,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:21,601 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:21,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801113398] [2021-12-22 11:12:21,601 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:21,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [799967638] [2021-12-22 11:12:21,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [799967638] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:21,601 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:21,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-12-22 11:12:21,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528918184] [2021-12-22 11:12:21,601 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:21,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-22 11:12:21,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:21,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-22 11:12:21,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2021-12-22 11:12:21,603 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 18 states have internal predecessors, (38), 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) [2021-12-22 11:12:21,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:21,909 INFO L93 Difference]: Finished difference Result 71 states and 83 transitions. [2021-12-22 11:12:21,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-22 11:12:21,909 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 18 states have internal predecessors, (38), 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 106 [2021-12-22 11:12:21,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:21,910 INFO L225 Difference]: With dead ends: 71 [2021-12-22 11:12:21,910 INFO L226 Difference]: Without dead ends: 66 [2021-12-22 11:12:21,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-12-22 11:12:21,911 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 2 mSDsluCounter, 628 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 681 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:21,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 681 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 517 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 11:12:21,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-12-22 11:12:21,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-12-22 11:12:21,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 16 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-22 11:12:21,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 78 transitions. [2021-12-22 11:12:21,919 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 78 transitions. Word has length 106 [2021-12-22 11:12:21,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:21,919 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 78 transitions. [2021-12-22 11:12:21,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 18 states have internal predecessors, (38), 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) [2021-12-22 11:12:21,920 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 78 transitions. [2021-12-22 11:12:21,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-12-22 11:12:21,921 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:21,921 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:21,930 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:22,128 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 [2021-12-22 11:12:22,128 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:22,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:22,129 INFO L85 PathProgramCache]: Analyzing trace with hash -444443359, now seen corresponding path program 14 times [2021-12-22 11:12:22,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:22,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642032404] [2021-12-22 11:12:22,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:22,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:22,135 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:22,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [805081715] [2021-12-22 11:12:22,135 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 11:12:22,135 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:22,136 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:22,137 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) [2021-12-22 11:12:22,138 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-22 11:12:23,196 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 11:12:23,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:23,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 64 conjunts are in the unsatisfiable core [2021-12-22 11:12:23,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:23,629 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 30 proven. 315 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-12-22 11:12:23,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:23,777 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:23,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642032404] [2021-12-22 11:12:23,777 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:23,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805081715] [2021-12-22 11:12:23,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805081715] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:23,777 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:23,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-12-22 11:12:23,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521396506] [2021-12-22 11:12:23,777 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:23,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-22 11:12:23,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:23,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-22 11:12:23,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2021-12-22 11:12:23,778 INFO L87 Difference]: Start difference. First operand 66 states and 78 transitions. Second operand has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 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) [2021-12-22 11:12:24,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:24,119 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2021-12-22 11:12:24,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-22 11:12:24,120 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 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 113 [2021-12-22 11:12:24,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:24,121 INFO L225 Difference]: With dead ends: 74 [2021-12-22 11:12:24,121 INFO L226 Difference]: Without dead ends: 69 [2021-12-22 11:12:24,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2021-12-22 11:12:24,122 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 2 mSDsluCounter, 701 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 757 SdHoareTripleChecker+Invalid, 583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:24,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 757 Invalid, 583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 11:12:24,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-22 11:12:24,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-12-22 11:12:24,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 states have internal predecessors, (49), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-22 11:12:24,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 82 transitions. [2021-12-22 11:12:24,130 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 82 transitions. Word has length 113 [2021-12-22 11:12:24,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:24,131 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 82 transitions. [2021-12-22 11:12:24,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 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) [2021-12-22 11:12:24,131 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 82 transitions. [2021-12-22 11:12:24,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-12-22 11:12:24,132 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:24,132 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:24,139 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:24,339 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 [2021-12-22 11:12:24,339 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:24,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:24,340 INFO L85 PathProgramCache]: Analyzing trace with hash -16713960, now seen corresponding path program 15 times [2021-12-22 11:12:24,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:24,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129334964] [2021-12-22 11:12:24,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:24,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:24,347 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:24,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1592870332] [2021-12-22 11:12:24,347 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-22 11:12:24,347 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:24,347 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:24,348 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) [2021-12-22 11:12:24,349 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-22 11:12:24,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-12-22 11:12:24,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:24,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 68 conjunts are in the unsatisfiable core [2021-12-22 11:12:24,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:25,101 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 32 proven. 360 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-12-22 11:12:25,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:25,241 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:25,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129334964] [2021-12-22 11:12:25,242 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:25,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592870332] [2021-12-22 11:12:25,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592870332] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:25,242 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:25,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-12-22 11:12:25,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671027413] [2021-12-22 11:12:25,242 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:25,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-22 11:12:25,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:25,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-22 11:12:25,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2021-12-22 11:12:25,243 INFO L87 Difference]: Start difference. First operand 69 states and 82 transitions. Second operand has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 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) [2021-12-22 11:12:25,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:25,573 INFO L93 Difference]: Finished difference Result 77 states and 91 transitions. [2021-12-22 11:12:25,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-22 11:12:25,574 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 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 120 [2021-12-22 11:12:25,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:25,575 INFO L225 Difference]: With dead ends: 77 [2021-12-22 11:12:25,575 INFO L226 Difference]: Without dead ends: 72 [2021-12-22 11:12:25,575 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2021-12-22 11:12:25,576 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 2 mSDsluCounter, 778 mSDsCounter, 0 mSdLazyCounter, 653 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 837 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 653 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:25,576 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 837 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 653 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 11:12:25,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-12-22 11:12:25,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-12-22 11:12:25,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 18 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-12-22 11:12:25,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 86 transitions. [2021-12-22 11:12:25,584 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 86 transitions. Word has length 120 [2021-12-22 11:12:25,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:25,584 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 86 transitions. [2021-12-22 11:12:25,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 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) [2021-12-22 11:12:25,585 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 86 transitions. [2021-12-22 11:12:25,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-12-22 11:12:25,586 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:25,586 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:25,592 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:25,791 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 [2021-12-22 11:12:25,791 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:25,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:25,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1287814847, now seen corresponding path program 16 times [2021-12-22 11:12:25,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:25,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913189490] [2021-12-22 11:12:25,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:25,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:25,808 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:25,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [790499997] [2021-12-22 11:12:25,812 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-22 11:12:25,812 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:25,813 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:25,813 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) [2021-12-22 11:12:25,815 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-22 11:12:26,807 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-22 11:12:26,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:26,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 72 conjunts are in the unsatisfiable core [2021-12-22 11:12:26,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:27,252 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 34 proven. 408 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2021-12-22 11:12:27,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:27,399 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:27,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913189490] [2021-12-22 11:12:27,399 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:27,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [790499997] [2021-12-22 11:12:27,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [790499997] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:27,399 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:27,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2021-12-22 11:12:27,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812733439] [2021-12-22 11:12:27,399 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:27,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-22 11:12:27,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:27,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-22 11:12:27,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2021-12-22 11:12:27,400 INFO L87 Difference]: Start difference. First operand 72 states and 86 transitions. Second operand has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 21 states have internal predecessors, (44), 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) [2021-12-22 11:12:27,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:27,777 INFO L93 Difference]: Finished difference Result 80 states and 95 transitions. [2021-12-22 11:12:27,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-22 11:12:27,778 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 21 states have internal predecessors, (44), 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 127 [2021-12-22 11:12:27,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:27,779 INFO L225 Difference]: With dead ends: 80 [2021-12-22 11:12:27,779 INFO L226 Difference]: Without dead ends: 75 [2021-12-22 11:12:27,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2021-12-22 11:12:27,780 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 2 mSDsluCounter, 859 mSDsCounter, 0 mSdLazyCounter, 727 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 921 SdHoareTripleChecker+Invalid, 727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 727 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:27,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 921 Invalid, 727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 727 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 11:12:27,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-12-22 11:12:27,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-12-22 11:12:27,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 52 states have (on average 1.0192307692307692) internal successors, (53), 52 states have internal predecessors, (53), 19 states have call successors, (19), 4 states have call predecessors, (19), 3 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-22 11:12:27,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-12-22 11:12:27,788 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 127 [2021-12-22 11:12:27,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:27,788 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-12-22 11:12:27,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 21 states have internal predecessors, (44), 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) [2021-12-22 11:12:27,789 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-12-22 11:12:27,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-12-22 11:12:27,789 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:27,790 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:27,799 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:27,990 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 [2021-12-22 11:12:27,990 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:27,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:27,991 INFO L85 PathProgramCache]: Analyzing trace with hash 146925304, now seen corresponding path program 17 times [2021-12-22 11:12:27,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:27,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398579733] [2021-12-22 11:12:27,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:27,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:27,998 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:27,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1130955592] [2021-12-22 11:12:27,999 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-22 11:12:27,999 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:27,999 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:28,000 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) [2021-12-22 11:12:28,005 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-22 11:12:29,313 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-12-22 11:12:29,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:29,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 76 conjunts are in the unsatisfiable core [2021-12-22 11:12:29,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:29,813 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 36 proven. 459 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2021-12-22 11:12:29,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:29,959 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:29,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398579733] [2021-12-22 11:12:29,960 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:29,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1130955592] [2021-12-22 11:12:29,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1130955592] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:29,960 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:29,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-12-22 11:12:29,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346380005] [2021-12-22 11:12:29,960 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:29,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-22 11:12:29,961 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:29,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-22 11:12:29,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2021-12-22 11:12:29,961 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 states have internal predecessors, (46), 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) [2021-12-22 11:12:30,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:30,440 INFO L93 Difference]: Finished difference Result 83 states and 99 transitions. [2021-12-22 11:12:30,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-22 11:12:30,441 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 states have internal predecessors, (46), 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 134 [2021-12-22 11:12:30,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:30,441 INFO L225 Difference]: With dead ends: 83 [2021-12-22 11:12:30,442 INFO L226 Difference]: Without dead ends: 78 [2021-12-22 11:12:30,442 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=674, Unknown=0, NotChecked=0, Total=756 [2021-12-22 11:12:30,442 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 2 mSDsluCounter, 944 mSDsCounter, 0 mSdLazyCounter, 805 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1009 SdHoareTripleChecker+Invalid, 805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 805 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:30,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1009 Invalid, 805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 805 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-22 11:12:30,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-22 11:12:30,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-12-22 11:12:30,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 54 states have (on average 1.0185185185185186) internal successors, (55), 54 states have internal predecessors, (55), 20 states have call successors, (20), 4 states have call predecessors, (20), 3 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-12-22 11:12:30,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 94 transitions. [2021-12-22 11:12:30,452 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 94 transitions. Word has length 134 [2021-12-22 11:12:30,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:30,452 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 94 transitions. [2021-12-22 11:12:30,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 states have internal predecessors, (46), 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) [2021-12-22 11:12:30,452 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 94 transitions. [2021-12-22 11:12:30,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-12-22 11:12:30,454 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:30,454 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:30,461 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:30,660 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 [2021-12-22 11:12:30,661 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:30,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:30,661 INFO L85 PathProgramCache]: Analyzing trace with hash 1332278625, now seen corresponding path program 18 times [2021-12-22 11:12:30,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:30,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872311567] [2021-12-22 11:12:30,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:30,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:30,668 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:30,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1597483093] [2021-12-22 11:12:30,668 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-22 11:12:30,668 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:30,668 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:30,669 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) [2021-12-22 11:12:30,675 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-22 11:12:31,863 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-12-22 11:12:31,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:31,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 80 conjunts are in the unsatisfiable core [2021-12-22 11:12:31,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:32,385 INFO L134 CoverageAnalysis]: Checked inductivity of 1235 backedges. 38 proven. 513 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2021-12-22 11:12:32,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:32,547 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:32,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872311567] [2021-12-22 11:12:32,548 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:32,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597483093] [2021-12-22 11:12:32,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597483093] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:32,548 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:32,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2021-12-22 11:12:32,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130645733] [2021-12-22 11:12:32,548 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:32,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-22 11:12:32,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:32,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-22 11:12:32,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2021-12-22 11:12:32,549 INFO L87 Difference]: Start difference. First operand 78 states and 94 transitions. Second operand has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 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) [2021-12-22 11:12:33,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:33,075 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2021-12-22 11:12:33,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-12-22 11:12:33,076 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 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 141 [2021-12-22 11:12:33,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:33,076 INFO L225 Difference]: With dead ends: 86 [2021-12-22 11:12:33,076 INFO L226 Difference]: Without dead ends: 81 [2021-12-22 11:12:33,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=85, Invalid=727, Unknown=0, NotChecked=0, Total=812 [2021-12-22 11:12:33,077 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 2 mSDsluCounter, 1033 mSDsCounter, 0 mSdLazyCounter, 887 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1101 SdHoareTripleChecker+Invalid, 887 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:33,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1101 Invalid, 887 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 887 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 11:12:33,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-12-22 11:12:33,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-12-22 11:12:33,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 56 states have (on average 1.0178571428571428) internal successors, (57), 56 states have internal predecessors, (57), 21 states have call successors, (21), 4 states have call predecessors, (21), 3 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-22 11:12:33,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 98 transitions. [2021-12-22 11:12:33,085 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 98 transitions. Word has length 141 [2021-12-22 11:12:33,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:33,086 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 98 transitions. [2021-12-22 11:12:33,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 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) [2021-12-22 11:12:33,086 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 98 transitions. [2021-12-22 11:12:33,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-12-22 11:12:33,087 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:33,087 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:33,096 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:33,294 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 [2021-12-22 11:12:33,294 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:33,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:33,295 INFO L85 PathProgramCache]: Analyzing trace with hash 2058456792, now seen corresponding path program 19 times [2021-12-22 11:12:33,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:33,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988112830] [2021-12-22 11:12:33,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:33,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:33,301 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:33,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [604658616] [2021-12-22 11:12:33,301 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-22 11:12:33,301 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:33,301 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:33,302 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) [2021-12-22 11:12:33,303 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-22 11:12:34,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:12:34,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 84 conjunts are in the unsatisfiable core [2021-12-22 11:12:34,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:34,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1370 backedges. 40 proven. 570 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2021-12-22 11:12:34,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:35,058 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:35,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988112830] [2021-12-22 11:12:35,058 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:35,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [604658616] [2021-12-22 11:12:35,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [604658616] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:35,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:35,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2021-12-22 11:12:35,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098087354] [2021-12-22 11:12:35,058 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:35,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-22 11:12:35,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:35,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-22 11:12:35,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2021-12-22 11:12:35,060 INFO L87 Difference]: Start difference. First operand 81 states and 98 transitions. Second operand has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 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) [2021-12-22 11:12:35,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:35,593 INFO L93 Difference]: Finished difference Result 89 states and 107 transitions. [2021-12-22 11:12:35,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-22 11:12:35,595 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 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 148 [2021-12-22 11:12:35,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:35,596 INFO L225 Difference]: With dead ends: 89 [2021-12-22 11:12:35,596 INFO L226 Difference]: Without dead ends: 84 [2021-12-22 11:12:35,597 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=88, Invalid=782, Unknown=0, NotChecked=0, Total=870 [2021-12-22 11:12:35,597 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 2 mSDsluCounter, 1126 mSDsCounter, 0 mSdLazyCounter, 973 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1197 SdHoareTripleChecker+Invalid, 973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 973 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:35,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1197 Invalid, 973 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 973 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 11:12:35,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-12-22 11:12:35,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-12-22 11:12:35,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 58 states have (on average 1.0172413793103448) internal successors, (59), 58 states have internal predecessors, (59), 22 states have call successors, (22), 4 states have call predecessors, (22), 3 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-12-22 11:12:35,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 102 transitions. [2021-12-22 11:12:35,607 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 102 transitions. Word has length 148 [2021-12-22 11:12:35,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:35,607 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 102 transitions. [2021-12-22 11:12:35,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 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) [2021-12-22 11:12:35,608 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 102 transitions. [2021-12-22 11:12:35,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-12-22 11:12:35,609 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:35,609 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:35,615 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-12-22 11:12:35,815 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 [2021-12-22 11:12:35,815 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:35,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:35,815 INFO L85 PathProgramCache]: Analyzing trace with hash 1810280833, now seen corresponding path program 20 times [2021-12-22 11:12:35,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:35,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959260406] [2021-12-22 11:12:35,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:35,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:35,825 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:35,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1553992780] [2021-12-22 11:12:35,825 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 11:12:35,825 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:35,825 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:35,826 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) [2021-12-22 11:12:35,827 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-22 11:12:36,601 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 11:12:36,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:36,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 88 conjunts are in the unsatisfiable core [2021-12-22 11:12:36,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:37,190 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 42 proven. 630 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2021-12-22 11:12:37,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:37,360 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:37,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959260406] [2021-12-22 11:12:37,360 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:37,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553992780] [2021-12-22 11:12:37,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553992780] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:37,360 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:37,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2021-12-22 11:12:37,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114297406] [2021-12-22 11:12:37,361 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:37,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-22 11:12:37,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:37,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-22 11:12:37,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2021-12-22 11:12:37,362 INFO L87 Difference]: Start difference. First operand 84 states and 102 transitions. Second operand has 26 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 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) [2021-12-22 11:12:37,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:37,950 INFO L93 Difference]: Finished difference Result 92 states and 111 transitions. [2021-12-22 11:12:37,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-22 11:12:37,950 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 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 155 [2021-12-22 11:12:37,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:37,951 INFO L225 Difference]: With dead ends: 92 [2021-12-22 11:12:37,951 INFO L226 Difference]: Without dead ends: 87 [2021-12-22 11:12:37,952 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=839, Unknown=0, NotChecked=0, Total=930 [2021-12-22 11:12:37,952 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 2 mSDsluCounter, 1223 mSDsCounter, 0 mSdLazyCounter, 1063 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1297 SdHoareTripleChecker+Invalid, 1063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1063 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:37,952 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1297 Invalid, 1063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1063 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 11:12:37,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-12-22 11:12:37,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-12-22 11:12:37,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 60 states have (on average 1.0166666666666666) internal successors, (61), 60 states have internal predecessors, (61), 23 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-22 11:12:37,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 106 transitions. [2021-12-22 11:12:37,962 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 106 transitions. Word has length 155 [2021-12-22 11:12:37,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:37,962 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 106 transitions. [2021-12-22 11:12:37,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 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) [2021-12-22 11:12:37,962 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 106 transitions. [2021-12-22 11:12:37,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-12-22 11:12:37,963 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:37,964 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:37,973 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-22 11:12:38,170 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 [2021-12-22 11:12:38,170 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:38,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:38,170 INFO L85 PathProgramCache]: Analyzing trace with hash 548269752, now seen corresponding path program 21 times [2021-12-22 11:12:38,171 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:38,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537653406] [2021-12-22 11:12:38,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:38,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:38,177 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:38,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [66681654] [2021-12-22 11:12:38,177 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-22 11:12:38,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:38,177 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:38,178 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) [2021-12-22 11:12:38,179 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-22 11:12:38,927 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-12-22 11:12:38,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:38,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 92 conjunts are in the unsatisfiable core [2021-12-22 11:12:38,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:39,654 INFO L134 CoverageAnalysis]: Checked inductivity of 1661 backedges. 44 proven. 693 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2021-12-22 11:12:39,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:39,819 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:39,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537653406] [2021-12-22 11:12:39,820 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:39,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [66681654] [2021-12-22 11:12:39,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [66681654] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:39,820 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:39,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2021-12-22 11:12:39,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398392461] [2021-12-22 11:12:39,820 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:39,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-22 11:12:39,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:39,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-22 11:12:39,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2021-12-22 11:12:39,821 INFO L87 Difference]: Start difference. First operand 87 states and 106 transitions. Second operand has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 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) [2021-12-22 11:12:40,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:40,414 INFO L93 Difference]: Finished difference Result 95 states and 115 transitions. [2021-12-22 11:12:40,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-22 11:12:40,414 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 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 162 [2021-12-22 11:12:40,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:40,415 INFO L225 Difference]: With dead ends: 95 [2021-12-22 11:12:40,415 INFO L226 Difference]: Without dead ends: 90 [2021-12-22 11:12:40,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 145 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=94, Invalid=898, Unknown=0, NotChecked=0, Total=992 [2021-12-22 11:12:40,416 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 2 mSDsluCounter, 1324 mSDsCounter, 0 mSdLazyCounter, 1157 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1401 SdHoareTripleChecker+Invalid, 1157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:40,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1401 Invalid, 1157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1157 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 11:12:40,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-12-22 11:12:40,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-12-22 11:12:40,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 62 states have (on average 1.0161290322580645) internal successors, (63), 62 states have internal predecessors, (63), 24 states have call successors, (24), 4 states have call predecessors, (24), 3 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-12-22 11:12:40,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 110 transitions. [2021-12-22 11:12:40,426 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 110 transitions. Word has length 162 [2021-12-22 11:12:40,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:40,427 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 110 transitions. [2021-12-22 11:12:40,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 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) [2021-12-22 11:12:40,427 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 110 transitions. [2021-12-22 11:12:40,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-12-22 11:12:40,429 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:40,429 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:40,436 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-12-22 11:12:40,635 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 [2021-12-22 11:12:40,636 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:40,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:40,636 INFO L85 PathProgramCache]: Analyzing trace with hash -954681951, now seen corresponding path program 22 times [2021-12-22 11:12:40,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:40,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594451247] [2021-12-22 11:12:40,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:40,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:40,642 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:40,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1511689658] [2021-12-22 11:12:40,643 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-22 11:12:40,643 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:40,643 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:40,644 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) [2021-12-22 11:12:40,645 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-22 11:12:41,182 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-22 11:12:41,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 11:12:41,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 96 conjunts are in the unsatisfiable core [2021-12-22 11:12:41,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:12:41,857 INFO L134 CoverageAnalysis]: Checked inductivity of 1817 backedges. 46 proven. 759 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2021-12-22 11:12:41,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:12:42,072 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:12:42,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594451247] [2021-12-22 11:12:42,072 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-22 11:12:42,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511689658] [2021-12-22 11:12:42,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1511689658] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:12:42,073 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:12:42,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2021-12-22 11:12:42,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398587512] [2021-12-22 11:12:42,073 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 11:12:42,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-22 11:12:42,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:12:42,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-22 11:12:42,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2021-12-22 11:12:42,074 INFO L87 Difference]: Start difference. First operand 90 states and 110 transitions. Second operand has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 states have internal predecessors, (56), 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) [2021-12-22 11:12:42,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:12:42,776 INFO L93 Difference]: Finished difference Result 98 states and 119 transitions. [2021-12-22 11:12:42,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-22 11:12:42,776 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 states have internal predecessors, (56), 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 169 [2021-12-22 11:12:42,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:12:42,778 INFO L225 Difference]: With dead ends: 98 [2021-12-22 11:12:42,778 INFO L226 Difference]: Without dead ends: 93 [2021-12-22 11:12:42,778 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=959, Unknown=0, NotChecked=0, Total=1056 [2021-12-22 11:12:42,779 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 2 mSDsluCounter, 1429 mSDsCounter, 0 mSdLazyCounter, 1255 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1509 SdHoareTripleChecker+Invalid, 1255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-22 11:12:42,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1509 Invalid, 1255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1255 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-22 11:12:42,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-12-22 11:12:42,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-12-22 11:12:42,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 64 states have (on average 1.015625) internal successors, (65), 64 states have internal predecessors, (65), 25 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-12-22 11:12:42,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 114 transitions. [2021-12-22 11:12:42,792 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 114 transitions. Word has length 169 [2021-12-22 11:12:42,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:12:42,793 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 114 transitions. [2021-12-22 11:12:42,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 states have internal predecessors, (56), 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) [2021-12-22 11:12:42,793 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 114 transitions. [2021-12-22 11:12:42,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-12-22 11:12:42,795 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:12:42,795 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 11:12:42,801 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-12-22 11:12:42,999 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 [2021-12-22 11:12:42,999 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:12:43,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:12:43,000 INFO L85 PathProgramCache]: Analyzing trace with hash -1441462632, now seen corresponding path program 23 times [2021-12-22 11:12:43,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:12:43,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008887798] [2021-12-22 11:12:43,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:12:43,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:12:43,008 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-22 11:12:43,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [302536047] [2021-12-22 11:12:43,008 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-22 11:12:43,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:12:43,009 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:12:43,010 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) [2021-12-22 11:12:43,011 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process