/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:39:01,753 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:39:01,754 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:39:01,783 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:39:01,783 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:39:01,784 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:39:01,785 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:39:01,786 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:39:01,797 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:39:01,798 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:39:01,798 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:39:01,799 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:39:01,799 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:39:01,800 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:39:01,801 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:39:01,803 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:39:01,803 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:39:01,809 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:39:01,811 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:39:01,814 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:39:01,815 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:39:01,816 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:39:01,817 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:39:01,817 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:39:01,819 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 22:39:01,819 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 22:39:01,819 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 22:39:01,820 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 22:39:01,820 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 22:39:01,821 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 22:39:01,821 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:39:01,821 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:39:01,822 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:39:01,822 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:39:01,823 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:39:01,823 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:39:01,823 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:39:01,823 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:39:01,824 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:39:01,824 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:39:01,826 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:39:01,828 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 22:39:01,854 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:39:01,854 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:39:01,854 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:39:01,854 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:39:01,855 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:39:01,855 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:39:01,855 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:39:01,855 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:39:01,856 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:39:01,856 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:39:01,856 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:39:01,856 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:39:01,856 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:39:01,857 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:39:01,857 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:39:01,857 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:39:01,857 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:39:01,857 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:39:01,857 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:39:01,857 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:39:01,858 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:39:01,858 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:39:01,858 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:39:01,858 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:39:01,858 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:39:01,858 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:39:01,858 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:39:01,858 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:39:01,859 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:39:01,859 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:39:01,859 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:39:01,859 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:39:01,859 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:39:01,859 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:39:01,859 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:39:01,859 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:39:01,860 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:39:01,860 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:39:01,860 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:39:01,860 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:39:01,860 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:39:01,860 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:39:02,062 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:39:02,084 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:39:02,086 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:39:02,087 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:39:02,087 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:39:02,088 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound100.c [2023-04-02 22:39:03,206 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:39:03,356 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:39:03,356 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound100.c [2023-04-02 22:39:03,360 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e6120a5df/2f717d48b9e4448cbcbf3500e8edf4bc/FLAGcfe43d216 [2023-04-02 22:39:03,372 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e6120a5df/2f717d48b9e4448cbcbf3500e8edf4bc [2023-04-02 22:39:03,374 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:39:03,377 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:39:03,378 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:39:03,378 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:39:03,380 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:39:03,381 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:39:03" (1/1) ... [2023-04-02 22:39:03,381 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a8288ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03, skipping insertion in model container [2023-04-02 22:39:03,382 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:39:03" (1/1) ... [2023-04-02 22:39:03,386 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:39:03,402 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:39:03,489 WARN L247 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/dijkstra-u_unwindbound100.c[525,538] [2023-04-02 22:39:03,517 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:39:03,524 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:39:03,533 WARN L247 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/dijkstra-u_unwindbound100.c[525,538] [2023-04-02 22:39:03,551 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:39:03,565 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:39:03,566 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03 WrapperNode [2023-04-02 22:39:03,566 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:39:03,567 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:39:03,567 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:39:03,567 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:39:03,574 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03" (1/1) ... [2023-04-02 22:39:03,574 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03" (1/1) ... [2023-04-02 22:39:03,588 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03" (1/1) ... [2023-04-02 22:39:03,589 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03" (1/1) ... [2023-04-02 22:39:03,592 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03" (1/1) ... [2023-04-02 22:39:03,594 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03" (1/1) ... [2023-04-02 22:39:03,595 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03" (1/1) ... [2023-04-02 22:39:03,596 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03" (1/1) ... [2023-04-02 22:39:03,597 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:39:03,597 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:39:03,598 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:39:03,598 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:39:03,598 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03" (1/1) ... [2023-04-02 22:39:03,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:39:03,614 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:03,623 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) [2023-04-02 22:39:03,636 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 [2023-04-02 22:39:03,647 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:39:03,648 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:39:03,648 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:39:03,648 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 22:39:03,648 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:39:03,648 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:39:03,648 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:39:03,648 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:39:03,648 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:39:03,648 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:39:03,648 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2023-04-02 22:39:03,648 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 22:39:03,648 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:39:03,648 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:39:03,649 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:39:03,649 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:39:03,649 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:39:03,649 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:39:03,649 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:39:03,649 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:39:03,691 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:39:03,692 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:39:03,891 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:39:03,935 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:39:03,935 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-02 22:39:03,937 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:39:03 BoogieIcfgContainer [2023-04-02 22:39:03,937 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:39:03,940 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:39:03,940 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:39:03,942 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:39:03,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:39:03" (1/3) ... [2023-04-02 22:39:03,943 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@332b8840 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:39:03, skipping insertion in model container [2023-04-02 22:39:03,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:03" (2/3) ... [2023-04-02 22:39:03,943 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@332b8840 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:39:03, skipping insertion in model container [2023-04-02 22:39:03,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:39:03" (3/3) ... [2023-04-02 22:39:03,944 INFO L112 eAbstractionObserver]: Analyzing ICFG dijkstra-u_unwindbound100.c [2023-04-02 22:39:03,956 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:39:03,956 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:39:03,995 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:39:04,001 INFO L357 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=FINITE_AUTOMATA, 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@73c6891d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:39:04,002 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:39:04,004 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-02 22:39:04,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-02 22:39:04,009 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:04,010 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:04,010 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:04,014 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:04,015 INFO L85 PathProgramCache]: Analyzing trace with hash -1529025729, now seen corresponding path program 1 times [2023-04-02 22:39:04,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:04,021 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695054068] [2023-04-02 22:39:04,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:04,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:04,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:04,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:04,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695054068] [2023-04-02 22:39:04,137 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-04-02 22:39:04,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730914888] [2023-04-02 22:39:04,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:04,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:04,138 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:04,141 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) [2023-04-02 22:39:04,142 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 22:39:04,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:04,221 INFO L262 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 1 conjunts are in the unsatisfiable core [2023-04-02 22:39:04,224 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:04,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:04,239 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:39:04,239 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730914888] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:04,239 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:39:04,239 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-04-02 22:39:04,241 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530560224] [2023-04-02 22:39:04,241 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:04,244 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-04-02 22:39:04,244 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:04,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-04-02 22:39:04,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 22:39:04,275 INFO L87 Difference]: Start difference. First operand has 34 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 22:39:04,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:04,341 INFO L93 Difference]: Finished difference Result 56 states and 90 transitions. [2023-04-02 22:39:04,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-04-02 22:39:04,343 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2023-04-02 22:39:04,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:04,348 INFO L225 Difference]: With dead ends: 56 [2023-04-02 22:39:04,348 INFO L226 Difference]: Without dead ends: 30 [2023-04-02 22:39:04,350 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 22:39:04,352 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:04,352 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 41 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:39:04,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-04-02 22:39:04,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-04-02 22:39:04,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 22:39:04,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2023-04-02 22:39:04,387 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 15 [2023-04-02 22:39:04,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:04,387 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2023-04-02 22:39:04,387 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 22:39:04,388 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2023-04-02 22:39:04,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-02 22:39:04,388 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:04,388 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:04,398 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-02 22:39:04,593 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-04-02 22:39:04,593 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:04,594 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:04,594 INFO L85 PathProgramCache]: Analyzing trace with hash -1095400856, now seen corresponding path program 1 times [2023-04-02 22:39:04,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:04,594 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576280183] [2023-04-02 22:39:04,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:04,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:04,620 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:04,620 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2043385898] [2023-04-02 22:39:04,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:04,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:04,620 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:04,621 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) [2023-04-02 22:39:04,623 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 22:39:04,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:04,681 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-02 22:39:04,683 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:04,730 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:04,730 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:39:04,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:04,730 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576280183] [2023-04-02 22:39:04,731 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:39:04,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043385898] [2023-04-02 22:39:04,731 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2043385898] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:04,731 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:39:04,731 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 22:39:04,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859210459] [2023-04-02 22:39:04,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:04,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 22:39:04,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:04,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 22:39:04,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-02 22:39:04,733 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:04,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:04,753 INFO L93 Difference]: Finished difference Result 50 states and 71 transitions. [2023-04-02 22:39:04,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 22:39:04,754 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2023-04-02 22:39:04,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:04,755 INFO L225 Difference]: With dead ends: 50 [2023-04-02 22:39:04,755 INFO L226 Difference]: Without dead ends: 32 [2023-04-02 22:39:04,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-02 22:39:04,756 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:04,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 100 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:39:04,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-02 22:39:04,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-04-02 22:39:04,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 22:39:04,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 43 transitions. [2023-04-02 22:39:04,762 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 43 transitions. Word has length 17 [2023-04-02 22:39:04,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:04,763 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 43 transitions. [2023-04-02 22:39:04,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:04,763 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 43 transitions. [2023-04-02 22:39:04,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-02 22:39:04,763 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:04,763 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:04,777 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 22:39:04,968 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-04-02 22:39:04,968 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:04,969 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:04,969 INFO L85 PathProgramCache]: Analyzing trace with hash 56656903, now seen corresponding path program 1 times [2023-04-02 22:39:04,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:04,969 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712781231] [2023-04-02 22:39:04,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:04,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:05,002 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:05,002 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1058023855] [2023-04-02 22:39:05,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:05,003 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:05,003 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:05,005 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) [2023-04-02 22:39:05,007 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 22:39:05,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:05,068 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 22:39:05,069 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:05,129 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:05,130 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:39:05,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:05,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712781231] [2023-04-02 22:39:05,130 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:39:05,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058023855] [2023-04-02 22:39:05,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058023855] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:05,130 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:39:05,130 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 22:39:05,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077377190] [2023-04-02 22:39:05,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:05,131 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 22:39:05,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:05,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 22:39:05,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 22:39:05,132 INFO L87 Difference]: Start difference. First operand 32 states and 43 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:05,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:05,163 INFO L93 Difference]: Finished difference Result 45 states and 59 transitions. [2023-04-02 22:39:05,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-02 22:39:05,163 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), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2023-04-02 22:39:05,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:05,164 INFO L225 Difference]: With dead ends: 45 [2023-04-02 22:39:05,164 INFO L226 Difference]: Without dead ends: 36 [2023-04-02 22:39:05,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 22:39:05,165 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 1 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:05,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 127 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:39:05,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-04-02 22:39:05,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2023-04-02 22:39:05,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 20 states have internal predecessors, (25), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 22:39:05,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 47 transitions. [2023-04-02 22:39:05,170 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 47 transitions. Word has length 18 [2023-04-02 22:39:05,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:05,170 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 47 transitions. [2023-04-02 22:39:05,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:05,171 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 47 transitions. [2023-04-02 22:39:05,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-02 22:39:05,171 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:05,171 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:05,194 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 22:39:05,388 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:05,389 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:05,389 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:05,389 INFO L85 PathProgramCache]: Analyzing trace with hash 58146453, now seen corresponding path program 1 times [2023-04-02 22:39:05,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:05,390 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76236976] [2023-04-02 22:39:05,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:05,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:05,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:05,725 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:05,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:05,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76236976] [2023-04-02 22:39:05,726 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76236976] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:05,726 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:39:05,726 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-04-02 22:39:05,726 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37182594] [2023-04-02 22:39:05,726 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:05,726 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-04-02 22:39:05,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:05,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-04-02 22:39:05,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-04-02 22:39:05,727 INFO L87 Difference]: Start difference. First operand 35 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 22:39:07,903 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:39:09,905 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:39:09,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:09,970 INFO L93 Difference]: Finished difference Result 67 states and 97 transitions. [2023-04-02 22:39:09,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 22:39:09,972 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2023-04-02 22:39:09,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:09,973 INFO L225 Difference]: With dead ends: 67 [2023-04-02 22:39:09,973 INFO L226 Difference]: Without dead ends: 47 [2023-04-02 22:39:09,974 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-04-02 22:39:09,974 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 11 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 24 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:09,975 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 122 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 105 Invalid, 2 Unknown, 0 Unchecked, 4.2s Time] [2023-04-02 22:39:09,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-04-02 22:39:09,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2023-04-02 22:39:09,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 25 states have internal predecessors, (29), 19 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:39:09,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 64 transitions. [2023-04-02 22:39:09,984 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 64 transitions. Word has length 18 [2023-04-02 22:39:09,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:09,988 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 64 transitions. [2023-04-02 22:39:09,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 22:39:09,989 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 64 transitions. [2023-04-02 22:39:09,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-02 22:39:09,989 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:09,989 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:09,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-02 22:39:09,990 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:09,990 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:09,990 INFO L85 PathProgramCache]: Analyzing trace with hash 45867820, now seen corresponding path program 1 times [2023-04-02 22:39:09,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:09,990 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27643952] [2023-04-02 22:39:09,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:09,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:09,998 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:09,998 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [419846287] [2023-04-02 22:39:09,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:09,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:09,998 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:10,014 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) [2023-04-02 22:39:10,015 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 22:39:10,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:10,054 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 22:39:10,056 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:10,096 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:10,096 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:39:10,145 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:10,145 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:10,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27643952] [2023-04-02 22:39:10,145 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:39:10,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419846287] [2023-04-02 22:39:10,145 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419846287] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:39:10,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [15320369] [2023-04-02 22:39:10,164 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 22:39:10,164 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:39:10,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:39:10,184 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:39:10,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:39:10,232 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:39:10,361 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-04-02 22:39:10,365 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 25 for LOIs [2023-04-02 22:39:10,370 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:39:10,375 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:39:10,822 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [15320369] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:10,823 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:39:10,823 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [5, 5] total 22 [2023-04-02 22:39:10,823 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397191759] [2023-04-02 22:39:10,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:10,824 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-02 22:39:10,824 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:10,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-02 22:39:10,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2023-04-02 22:39:10,824 INFO L87 Difference]: Start difference. First operand 47 states and 64 transitions. Second operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:14,393 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:39:16,427 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:18,218 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.50s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:21,809 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:21,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:21,855 INFO L93 Difference]: Finished difference Result 75 states and 104 transitions. [2023-04-02 22:39:21,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 22:39:21,855 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2023-04-02 22:39:21,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:21,856 INFO L225 Difference]: With dead ends: 75 [2023-04-02 22:39:21,856 INFO L226 Difference]: Without dead ends: 48 [2023-04-02 22:39:21,857 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=140, Invalid=672, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:39:21,857 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 18 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 569 mSolverCounterSat, 22 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 594 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 569 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.7s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:21,857 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 76 Invalid, 594 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 569 Invalid, 3 Unknown, 0 Unchecked, 10.7s Time] [2023-04-02 22:39:21,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-04-02 22:39:21,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2023-04-02 22:39:21,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 25 states have internal predecessors, (28), 19 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:39:21,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 63 transitions. [2023-04-02 22:39:21,868 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 63 transitions. Word has length 20 [2023-04-02 22:39:21,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:21,869 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 63 transitions. [2023-04-02 22:39:21,869 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:21,869 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 63 transitions. [2023-04-02 22:39:21,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 22:39:21,869 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:21,869 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:21,891 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-04-02 22:39:22,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:22,091 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:22,091 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:22,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1076247491, now seen corresponding path program 1 times [2023-04-02 22:39:22,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:22,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262927680] [2023-04-02 22:39:22,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:22,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:22,098 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:22,098 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2007676595] [2023-04-02 22:39:22,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:22,098 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:22,098 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:22,113 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) [2023-04-02 22:39:22,117 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 22:39:22,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:22,148 INFO L262 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 9 conjunts are in the unsatisfiable core [2023-04-02 22:39:22,149 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:22,180 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:22,180 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:39:22,222 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:22,223 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:22,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262927680] [2023-04-02 22:39:22,223 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:39:22,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007676595] [2023-04-02 22:39:22,223 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007676595] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:39:22,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2047286731] [2023-04-02 22:39:22,225 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 22:39:22,225 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:39:22,225 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:39:22,225 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:39:22,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:39:22,251 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:39:22,364 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-02 22:39:22,370 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 25 for LOIs [2023-04-02 22:39:22,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:39:22,377 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:39:22,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [2047286731] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:22,829 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:39:22,829 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [6, 6] total 24 [2023-04-02 22:39:22,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461556358] [2023-04-02 22:39:22,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:22,829 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-02 22:39:22,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:22,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-02 22:39:22,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2023-04-02 22:39:22,830 INFO L87 Difference]: Start difference. First operand 47 states and 63 transitions. Second operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:24,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:24,371 INFO L93 Difference]: Finished difference Result 68 states and 95 transitions. [2023-04-02 22:39:24,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-02 22:39:24,372 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2023-04-02 22:39:24,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:24,373 INFO L225 Difference]: With dead ends: 68 [2023-04-02 22:39:24,373 INFO L226 Difference]: Without dead ends: 59 [2023-04-02 22:39:24,373 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2023-04-02 22:39:24,374 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 20 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 552 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 552 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:24,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 22 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 552 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-04-02 22:39:24,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-04-02 22:39:24,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 49. [2023-04-02 22:39:24,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 25 states have (on average 1.2) internal successors, (30), 27 states have internal predecessors, (30), 19 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:39:24,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 65 transitions. [2023-04-02 22:39:24,384 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 65 transitions. Word has length 21 [2023-04-02 22:39:24,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:24,384 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 65 transitions. [2023-04-02 22:39:24,385 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:24,385 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 65 transitions. [2023-04-02 22:39:24,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 22:39:24,385 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:24,385 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:24,389 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-02 22:39:24,589 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:24,590 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:24,590 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:24,590 INFO L85 PathProgramCache]: Analyzing trace with hash 1077737041, now seen corresponding path program 1 times [2023-04-02 22:39:24,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:24,590 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213484397] [2023-04-02 22:39:24,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:24,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:24,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:24,796 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:24,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:24,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213484397] [2023-04-02 22:39:24,796 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213484397] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:39:24,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408882546] [2023-04-02 22:39:24,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:24,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:24,797 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:24,803 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) [2023-04-02 22:39:24,804 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 22:39:24,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:24,832 INFO L262 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 15 conjunts are in the unsatisfiable core [2023-04-02 22:39:24,835 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:24,906 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:24,906 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:39:24,984 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:24,985 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408882546] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:39:24,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [141157725] [2023-04-02 22:39:24,986 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 22:39:24,986 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:39:24,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:39:24,986 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:39:24,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:39:25,009 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:39:25,102 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2023-04-02 22:39:25,108 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 25 for LOIs [2023-04-02 22:39:25,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:39:25,114 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:39:25,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [141157725] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:25,573 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:39:25,573 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [7, 7, 7] total 28 [2023-04-02 22:39:25,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606404101] [2023-04-02 22:39:25,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:25,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-02 22:39:25,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:25,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-02 22:39:25,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2023-04-02 22:39:25,574 INFO L87 Difference]: Start difference. First operand 49 states and 65 transitions. Second operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:29,097 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:30,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:30,660 INFO L93 Difference]: Finished difference Result 65 states and 89 transitions. [2023-04-02 22:39:30,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 22:39:30,660 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2023-04-02 22:39:30,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:30,661 INFO L225 Difference]: With dead ends: 65 [2023-04-02 22:39:30,661 INFO L226 Difference]: Without dead ends: 46 [2023-04-02 22:39:30,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=170, Invalid=1020, Unknown=0, NotChecked=0, Total=1190 [2023-04-02 22:39:30,662 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 23 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:30,662 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 33 Invalid, 414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 382 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2023-04-02 22:39:30,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-04-02 22:39:30,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-04-02 22:39:30,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 18 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:39:30,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 61 transitions. [2023-04-02 22:39:30,669 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 61 transitions. Word has length 21 [2023-04-02 22:39:30,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:30,669 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 61 transitions. [2023-04-02 22:39:30,669 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:30,669 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 61 transitions. [2023-04-02 22:39:30,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 22:39:30,670 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:30,670 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:30,690 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-02 22:39:30,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:30,875 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:30,875 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:30,875 INFO L85 PathProgramCache]: Analyzing trace with hash -2008937068, now seen corresponding path program 1 times [2023-04-02 22:39:30,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:30,875 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751496135] [2023-04-02 22:39:30,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:30,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:30,904 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:30,904 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [109589680] [2023-04-02 22:39:30,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:30,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:30,904 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:30,916 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) [2023-04-02 22:39:30,917 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 22:39:30,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:30,967 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 11 conjunts are in the unsatisfiable core [2023-04-02 22:39:30,970 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:31,025 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 22:39:31,025 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:39:31,100 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 22:39:31,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:31,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751496135] [2023-04-02 22:39:31,100 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:39:31,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109589680] [2023-04-02 22:39:31,100 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109589680] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:39:31,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [285598853] [2023-04-02 22:39:31,105 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-04-02 22:39:31,105 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:39:31,105 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:39:31,105 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:39:31,106 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:39:31,121 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:39:31,884 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2023-04-02 22:39:31,893 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 25 for LOIs [2023-04-02 22:39:31,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:39:31,898 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:39:32,599 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2143#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (<= ~counter~0 101) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:39:32,599 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:39:32,599 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:39:32,599 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2023-04-02 22:39:32,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874228248] [2023-04-02 22:39:32,600 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:39:32,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-02 22:39:32,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:32,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-02 22:39:32,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=675, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:39:32,601 INFO L87 Difference]: Start difference. First operand 46 states and 61 transitions. Second operand has 12 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2023-04-02 22:39:34,645 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:39:36,622 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:39,870 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.42s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:39:42,351 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:44,004 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:46,500 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:48,715 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.70s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:39:51,350 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:39:52,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:52,493 INFO L93 Difference]: Finished difference Result 215 states and 299 transitions. [2023-04-02 22:39:52,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 22:39:52,494 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) Word has length 54 [2023-04-02 22:39:52,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:52,495 INFO L225 Difference]: With dead ends: 215 [2023-04-02 22:39:52,495 INFO L226 Difference]: Without dead ends: 206 [2023-04-02 22:39:52,496 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 128 SyntacticMatches, 6 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=179, Invalid=943, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 22:39:52,496 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 139 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 75 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.8s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:52,496 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 200 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 153 Invalid, 4 Unknown, 0 Unchecked, 19.8s Time] [2023-04-02 22:39:52,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2023-04-02 22:39:52,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 192. [2023-04-02 22:39:52,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 94 states have (on average 1.1808510638297873) internal successors, (111), 99 states have internal predecessors, (111), 84 states have call successors, (84), 14 states have call predecessors, (84), 13 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2023-04-02 22:39:52,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 273 transitions. [2023-04-02 22:39:52,518 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 273 transitions. Word has length 54 [2023-04-02 22:39:52,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:52,518 INFO L495 AbstractCegarLoop]: Abstraction has 192 states and 273 transitions. [2023-04-02 22:39:52,518 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2023-04-02 22:39:52,519 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 273 transitions. [2023-04-02 22:39:52,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 22:39:52,520 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:52,520 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:52,526 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-04-02 22:39:52,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:52,723 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:52,723 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:52,723 INFO L85 PathProgramCache]: Analyzing trace with hash -2007447518, now seen corresponding path program 1 times [2023-04-02 22:39:52,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:52,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847790511] [2023-04-02 22:39:52,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:52,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:52,734 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:52,734 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1782620903] [2023-04-02 22:39:52,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:52,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:52,734 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:52,739 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) [2023-04-02 22:39:52,743 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 22:39:52,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:52,892 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 27 conjunts are in the unsatisfiable core [2023-04-02 22:39:52,894 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:53,137 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 23 proven. 10 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 22:39:53,138 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:39:59,825 WARN L839 $PredicateComparison]: unable to prove that (let ((.cse4 (mod c_main_~q~0 4294967296))) (or (let ((.cse2 (div .cse4 4))) (let ((.cse1 (mod (+ c_main_~p~0 .cse2) 4294967296)) (.cse0 (mod c_main_~r~0 4294967296)) (.cse3 (* 2 (div (mod c_main_~p~0 4294967296) 2)))) (and (or (< .cse0 .cse1) (< (mod (+ (* 4294967295 .cse2) c_main_~r~0 (* 4294967295 c_main_~p~0)) 4294967296) (mod (+ (* 3 .cse2) .cse3) 4294967296))) (or (<= .cse1 .cse0) (< .cse0 (mod (+ .cse3 .cse2) 4294967296)))))) (= .cse4 1) (forall ((main_~h~0 Int)) (not (= (mod (+ (* c_main_~q~0 c_main_~q~0 4294967295 c_main_~p~0) (* c_main_~q~0 main_~h~0 c_main_~r~0 4) (* 4294967292 c_main_~q~0 main_~h~0 c_main_~n~0) (* main_~h~0 main_~h~0 c_main_~p~0) (* c_main_~q~0 c_main_~p~0 c_main_~n~0 4) (* 4294967292 c_main_~q~0 c_main_~p~0 c_main_~r~0)) 4294967296) 0))))) is different from false [2023-04-02 22:39:59,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:59,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847790511] [2023-04-02 22:39:59,828 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:39:59,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782620903] [2023-04-02 22:39:59,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782620903] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:39:59,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1557034748] [2023-04-02 22:39:59,830 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-04-02 22:39:59,830 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:39:59,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:39:59,830 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:39:59,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:39:59,856 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:40:00,426 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2023-04-02 22:40:00,433 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 25 for LOIs [2023-04-02 22:40:00,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:40:00,438 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:40:01,139 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3031#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 100) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:40:01,139 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:40:01,139 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:40:01,139 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2023-04-02 22:40:01,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981937198] [2023-04-02 22:40:01,139 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:40:01,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-02 22:40:01,140 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:40:01,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-02 22:40:01,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=783, Unknown=1, NotChecked=56, Total=930 [2023-04-02 22:40:01,140 INFO L87 Difference]: Start difference. First operand 192 states and 273 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 9 states have internal predecessors, (24), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2023-04-02 22:40:05,615 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:40:06,828 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:40:08,946 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:40:12,080 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.22s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:40:16,066 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:40:18,068 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:40:20,636 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:40:21,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:40:21,765 INFO L93 Difference]: Finished difference Result 268 states and 384 transitions. [2023-04-02 22:40:21,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 22:40:21,766 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 9 states have internal predecessors, (24), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 54 [2023-04-02 22:40:21,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:40:21,767 INFO L225 Difference]: With dead ends: 268 [2023-04-02 22:40:21,767 INFO L226 Difference]: Without dead ends: 200 [2023-04-02 22:40:21,768 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 85 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=105, Invalid=890, Unknown=1, NotChecked=60, Total=1056 [2023-04-02 22:40:21,769 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 13 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 13 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.6s IncrementalHoareTripleChecker+Time [2023-04-02 22:40:21,769 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 147 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 322 Invalid, 5 Unknown, 0 Unchecked, 20.6s Time] [2023-04-02 22:40:21,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2023-04-02 22:40:21,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 200. [2023-04-02 22:40:21,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 100 states have (on average 1.16) internal successors, (116), 105 states have internal predecessors, (116), 84 states have call successors, (84), 16 states have call predecessors, (84), 15 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2023-04-02 22:40:21,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 278 transitions. [2023-04-02 22:40:21,809 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 278 transitions. Word has length 54 [2023-04-02 22:40:21,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:40:21,810 INFO L495 AbstractCegarLoop]: Abstraction has 200 states and 278 transitions. [2023-04-02 22:40:21,810 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 9 states have internal predecessors, (24), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2023-04-02 22:40:21,810 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 278 transitions. [2023-04-02 22:40:21,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-04-02 22:40:21,811 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:40:21,811 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:40:21,818 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-04-02 22:40:22,016 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-04-02 22:40:22,016 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:40:22,017 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:40:22,017 INFO L85 PathProgramCache]: Analyzing trace with hash -301051426, now seen corresponding path program 2 times [2023-04-02 22:40:22,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:40:22,017 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883613723] [2023-04-02 22:40:22,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:40:22,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:40:22,029 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:40:22,030 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1518801118] [2023-04-02 22:40:22,030 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:40:22,030 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:40:22,030 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:40:22,031 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) [2023-04-02 22:40:22,033 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 22:40:22,354 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 22:40:22,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:40:22,355 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 19 conjunts are in the unsatisfiable core [2023-04-02 22:40:22,357 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:40:22,602 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 18 proven. 3 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-04-02 22:40:22,602 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:43:05,773 WARN L223 SmtUtils]: Spent 42.17s on a formula simplification. DAG size of input: 256 DAG size of output: 194 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)