/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/egcd-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:51:17,958 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:51:17,960 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:51:17,996 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:51:17,996 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:51:17,999 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:51:18,002 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:51:18,003 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:51:18,005 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:51:18,010 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:51:18,011 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:51:18,012 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:51:18,012 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:51:18,015 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:51:18,016 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:51:18,017 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:51:18,017 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:51:18,018 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:51:18,020 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:51:18,024 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:51:18,025 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:51:18,026 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:51:18,027 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:51:18,027 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:51:18,029 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 22:51:18,030 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 22:51:18,030 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 22:51:18,030 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 22:51:18,031 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 22:51:18,031 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 22:51:18,031 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:51:18,032 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:51:18,032 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:51:18,033 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:51:18,034 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:51:18,034 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:51:18,034 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:51:18,035 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:51:18,035 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:51:18,036 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:51:18,036 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:51:18,037 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 22:51:18,057 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:51:18,057 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:51:18,058 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:51:18,058 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:51:18,058 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:51:18,059 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:51:18,059 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:51:18,059 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:51:18,059 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:51:18,059 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:51:18,060 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:51:18,060 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:51:18,060 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:51:18,060 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:51:18,060 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:51:18,060 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:51:18,061 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:51:18,061 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:51:18,061 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:51:18,062 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:51:18,062 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:51:18,062 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:51:18,062 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:51:18,062 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:51:18,062 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:51:18,062 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:51:18,063 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:51:18,063 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:51:18,063 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:51:18,063 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:51:18,063 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:51:18,063 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:51:18,064 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:51:18,064 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:51:18,064 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:51:18,064 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:51:18,064 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:51:18,064 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:51:18,065 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:51:18,065 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:51:18,065 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:51:18,065 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:51:18,264 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:51:18,281 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:51:18,283 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:51:18,284 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:51:18,284 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:51:18,285 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c [2023-04-02 22:51:19,420 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:51:19,587 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:51:19,588 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c [2023-04-02 22:51:19,594 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a3e545f1b/a67ebfaa7d9c407a91b09d3c341620f3/FLAG417508066 [2023-04-02 22:51:19,607 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a3e545f1b/a67ebfaa7d9c407a91b09d3c341620f3 [2023-04-02 22:51:19,610 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:51:19,612 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:51:19,614 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:51:19,614 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:51:19,617 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:51:19,618 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:51:19" (1/1) ... [2023-04-02 22:51:19,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71d6ffb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19, skipping insertion in model container [2023-04-02 22:51:19,619 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:51:19" (1/1) ... [2023-04-02 22:51:19,626 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:51:19,642 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:51:19,740 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/egcd-ll_unwindbound50.c[489,502] [2023-04-02 22:51:19,755 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:51:19,762 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:51:19,771 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/egcd-ll_unwindbound50.c[489,502] [2023-04-02 22:51:19,777 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:51:19,786 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:51:19,787 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19 WrapperNode [2023-04-02 22:51:19,787 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:51:19,787 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:51:19,788 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:51:19,788 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:51:19,797 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19" (1/1) ... [2023-04-02 22:51:19,797 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19" (1/1) ... [2023-04-02 22:51:19,803 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19" (1/1) ... [2023-04-02 22:51:19,804 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19" (1/1) ... [2023-04-02 22:51:19,812 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19" (1/1) ... [2023-04-02 22:51:19,815 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19" (1/1) ... [2023-04-02 22:51:19,817 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19" (1/1) ... [2023-04-02 22:51:19,818 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19" (1/1) ... [2023-04-02 22:51:19,819 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:51:19,820 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:51:19,820 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:51:19,820 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:51:19,821 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19" (1/1) ... [2023-04-02 22:51:19,831 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:51:19,839 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:51:19,851 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 22:51:19,853 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 22:51:19,882 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:51:19,882 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:51:19,882 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:51:19,882 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 22:51:19,883 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:51:19,883 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:51:19,883 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:51:19,883 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:51:19,883 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:51:19,883 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:51:19,883 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 22:51:19,883 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 22:51:19,884 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:51:19,884 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:51:19,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:51:19,884 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:51:19,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:51:19,884 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:51:19,884 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:51:19,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:51:19,942 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:51:19,943 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:51:20,091 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:51:20,136 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:51:20,136 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-02 22:51:20,138 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:51:20 BoogieIcfgContainer [2023-04-02 22:51:20,138 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:51:20,140 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:51:20,140 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:51:20,143 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:51:20,143 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:51:19" (1/3) ... [2023-04-02 22:51:20,144 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@216fe485 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:51:20, skipping insertion in model container [2023-04-02 22:51:20,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:51:19" (2/3) ... [2023-04-02 22:51:20,144 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@216fe485 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:51:20, skipping insertion in model container [2023-04-02 22:51:20,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:51:20" (3/3) ... [2023-04-02 22:51:20,145 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd-ll_unwindbound50.c [2023-04-02 22:51:20,176 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:51:20,177 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:51:20,243 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:51:20,249 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;@7053daec, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:51:20,250 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:51:20,257 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-04-02 22:51:20,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-02 22:51:20,266 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:20,266 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:51:20,267 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:20,276 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:20,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1989446445, now seen corresponding path program 1 times [2023-04-02 22:51:20,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:20,286 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647282510] [2023-04-02 22:51:20,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:20,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:20,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:51:20,489 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:51:20,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:20,490 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647282510] [2023-04-02 22:51:20,490 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [647282510] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:51:20,490 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:51:20,491 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-04-02 22:51:20,492 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191399762] [2023-04-02 22:51:20,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:51:20,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-04-02 22:51:20,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:20,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-04-02 22:51:20,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 22:51:20,531 INFO L87 Difference]: Start difference. First operand has 30 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-02 22:51:20,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:51:20,576 INFO L93 Difference]: Finished difference Result 50 states and 76 transitions. [2023-04-02 22:51:20,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-04-02 22:51:20,579 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 17 [2023-04-02 22:51:20,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:51:20,585 INFO L225 Difference]: With dead ends: 50 [2023-04-02 22:51:20,585 INFO L226 Difference]: Without dead ends: 26 [2023-04-02 22:51:20,588 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 22:51:20,591 INFO L413 NwaCegarLoop]: 34 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, 34 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:51:20,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:51:20,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-02 22:51:20,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-04-02 22:51:20,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-02 22:51:20,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2023-04-02 22:51:20,621 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 17 [2023-04-02 22:51:20,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:51:20,622 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2023-04-02 22:51:20,622 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-02 22:51:20,623 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2023-04-02 22:51:20,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-02 22:51:20,624 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:20,624 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:51:20,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 22:51:20,625 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:20,625 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:20,626 INFO L85 PathProgramCache]: Analyzing trace with hash 894685111, now seen corresponding path program 1 times [2023-04-02 22:51:20,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:20,626 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870499562] [2023-04-02 22:51:20,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:20,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:20,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:51:20,825 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:51:20,826 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:20,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870499562] [2023-04-02 22:51:20,826 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870499562] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:51:20,826 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:51:20,826 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 22:51:20,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724928437] [2023-04-02 22:51:20,827 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:51:20,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 22:51:20,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:20,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 22:51:20,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-02 22:51:20,829 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-02 22:51:20,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:51:20,854 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2023-04-02 22:51:20,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 22:51:20,854 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 18 [2023-04-02 22:51:20,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:51:20,855 INFO L225 Difference]: With dead ends: 38 [2023-04-02 22:51:20,855 INFO L226 Difference]: Without dead ends: 28 [2023-04-02 22:51:20,856 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 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 22:51:20,857 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 3 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:51:20,857 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 78 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:51:20,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-02 22:51:20,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-04-02 22:51:20,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 14 states have internal predecessors, (16), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-02 22:51:20,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 36 transitions. [2023-04-02 22:51:20,865 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 36 transitions. Word has length 18 [2023-04-02 22:51:20,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:51:20,865 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 36 transitions. [2023-04-02 22:51:20,866 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-02 22:51:20,866 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 36 transitions. [2023-04-02 22:51:20,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-02 22:51:20,866 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:20,866 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:51:20,867 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 22:51:20,867 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:20,867 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:20,867 INFO L85 PathProgramCache]: Analyzing trace with hash 896353407, now seen corresponding path program 1 times [2023-04-02 22:51:20,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:20,868 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345601565] [2023-04-02 22:51:20,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:20,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:20,882 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:51:20,883 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1335929237] [2023-04-02 22:51:20,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:20,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:20,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:51:20,886 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 22:51:20,899 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 22:51:20,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:51:20,958 INFO L262 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 17 conjunts are in the unsatisfiable core [2023-04-02 22:51:20,962 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:51:21,061 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 22:51:21,061 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:51:21,166 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:51:21,167 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:21,167 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345601565] [2023-04-02 22:51:21,167 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:51:21,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335929237] [2023-04-02 22:51:21,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1335929237] provided 1 perfect and 1 imperfect interpolant sequences [2023-04-02 22:51:21,172 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:51:21,172 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2023-04-02 22:51:21,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038995121] [2023-04-02 22:51:21,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:51:21,173 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 22:51:21,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:21,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 22:51:21,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-04-02 22:51:21,176 INFO L87 Difference]: Start difference. First operand 28 states and 36 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-02 22:51:21,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:51:21,781 INFO L93 Difference]: Finished difference Result 42 states and 56 transitions. [2023-04-02 22:51:21,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 22:51:21,782 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 18 [2023-04-02 22:51:21,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:51:21,783 INFO L225 Difference]: With dead ends: 42 [2023-04-02 22:51:21,783 INFO L226 Difference]: Without dead ends: 40 [2023-04-02 22:51:21,783 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2023-04-02 22:51:21,784 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 7 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 22:51:21,785 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 104 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 3 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 22:51:21,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-04-02 22:51:21,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2023-04-02 22:51:21,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 19 states have internal predecessors, (21), 17 states have call successors, (17), 5 states have call predecessors, (17), 4 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2023-04-02 22:51:21,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 53 transitions. [2023-04-02 22:51:21,802 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 53 transitions. Word has length 18 [2023-04-02 22:51:21,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:51:21,802 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 53 transitions. [2023-04-02 22:51:21,802 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-02 22:51:21,802 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 53 transitions. [2023-04-02 22:51:21,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-04-02 22:51:21,803 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:21,803 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:51:21,819 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 22:51:22,019 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:22,019 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:22,020 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:22,020 INFO L85 PathProgramCache]: Analyzing trace with hash 500857910, now seen corresponding path program 1 times [2023-04-02 22:51:22,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:22,020 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004605202] [2023-04-02 22:51:22,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:22,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:22,037 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:51:22,038 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [840524391] [2023-04-02 22:51:22,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:22,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:22,038 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:51:22,050 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 22:51:22,054 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 22:51:22,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:51:22,115 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 23 conjunts are in the unsatisfiable core [2023-04-02 22:51:22,117 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:51:22,300 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 22:51:22,300 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:51:22,400 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:22,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004605202] [2023-04-02 22:51:22,404 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:51:22,406 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840524391] [2023-04-02 22:51:22,406 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [840524391] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:51:22,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1120841585] [2023-04-02 22:51:22,430 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-02 22:51:22,431 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:51:22,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:51:22,438 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:51:22,439 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:51:22,508 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:51:22,811 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-04-02 22:51:22,819 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 11 for LOIs [2023-04-02 22:51:22,821 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:51:22,829 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:51:23,237 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1120841585] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:51:23,237 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:51:23,237 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [10] total 23 [2023-04-02 22:51:23,238 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551640216] [2023-04-02 22:51:23,238 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:51:23,238 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 22:51:23,238 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:23,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 22:51:23,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=547, Unknown=0, NotChecked=0, Total=650 [2023-04-02 22:51:23,239 INFO L87 Difference]: Start difference. First operand 39 states and 53 transitions. Second operand has 15 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 5 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 22:51:24,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:51:24,059 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2023-04-02 22:51:24,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 22:51:24,059 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 5 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 23 [2023-04-02 22:51:24,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:51:24,063 INFO L225 Difference]: With dead ends: 46 [2023-04-02 22:51:24,063 INFO L226 Difference]: Without dead ends: 42 [2023-04-02 22:51:24,064 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=188, Invalid=934, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 22:51:24,067 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 18 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:51:24,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 22 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:51:24,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-04-02 22:51:24,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2023-04-02 22:51:24,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 16 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-04-02 22:51:24,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 53 transitions. [2023-04-02 22:51:24,089 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 53 transitions. Word has length 23 [2023-04-02 22:51:24,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:51:24,093 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 53 transitions. [2023-04-02 22:51:24,094 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 5 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 22:51:24,094 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 53 transitions. [2023-04-02 22:51:24,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-04-02 22:51:24,096 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:24,096 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 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 22:51:24,102 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 22:51:24,302 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,SelfDestructingSolverStorable3 [2023-04-02 22:51:24,302 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:24,303 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:24,303 INFO L85 PathProgramCache]: Analyzing trace with hash 1248754561, now seen corresponding path program 1 times [2023-04-02 22:51:24,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:24,303 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217436896] [2023-04-02 22:51:24,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:24,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:24,315 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:51:24,315 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [233690570] [2023-04-02 22:51:24,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:24,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:24,315 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:51:24,321 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 22:51:24,324 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 22:51:24,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:51:24,366 INFO L262 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 22:51:24,367 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:51:24,381 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-02 22:51:24,381 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:51:24,381 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:24,382 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217436896] [2023-04-02 22:51:24,382 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:51:24,382 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [233690570] [2023-04-02 22:51:24,382 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [233690570] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:51:24,382 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:51:24,382 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 22:51:24,382 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266913123] [2023-04-02 22:51:24,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:51:24,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 22:51:24,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:24,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 22:51:24,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 22:51:24,383 INFO L87 Difference]: Start difference. First operand 42 states and 53 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-04-02 22:51:24,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:51:24,423 INFO L93 Difference]: Finished difference Result 52 states and 65 transitions. [2023-04-02 22:51:24,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-02 22:51:24,423 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 34 [2023-04-02 22:51:24,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:51:24,424 INFO L225 Difference]: With dead ends: 52 [2023-04-02 22:51:24,424 INFO L226 Difference]: Without dead ends: 50 [2023-04-02 22:51:24,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-04-02 22:51:24,425 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 5 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:51:24,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 112 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:51:24,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-04-02 22:51:24,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2023-04-02 22:51:24,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 23 states have (on average 1.173913043478261) internal successors, (27), 26 states have internal predecessors, (27), 17 states have call successors, (17), 7 states have call predecessors, (17), 6 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 22:51:24,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 58 transitions. [2023-04-02 22:51:24,439 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 58 transitions. Word has length 34 [2023-04-02 22:51:24,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:51:24,439 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 58 transitions. [2023-04-02 22:51:24,439 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-04-02 22:51:24,439 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 58 transitions. [2023-04-02 22:51:24,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-02 22:51:24,440 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:24,440 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 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 22:51:24,451 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 22:51:24,651 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:24,652 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:24,652 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:24,652 INFO L85 PathProgramCache]: Analyzing trace with hash 1865171584, now seen corresponding path program 1 times [2023-04-02 22:51:24,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:24,653 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985629769] [2023-04-02 22:51:24,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:24,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:24,668 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:51:24,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2014388221] [2023-04-02 22:51:24,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:24,669 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:24,669 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:51:24,670 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 22:51:24,673 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 22:51:24,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:51:24,721 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 22:51:24,723 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:51:24,778 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-02 22:51:24,779 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:51:24,842 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-02 22:51:24,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:24,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985629769] [2023-04-02 22:51:24,843 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:51:24,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014388221] [2023-04-02 22:51:24,843 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2014388221] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:51:24,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [551738997] [2023-04-02 22:51:24,845 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 22:51:24,846 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:51:24,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:51:24,846 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:51:24,846 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:51:24,883 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:51:26,721 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2023-04-02 22:51:26,726 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 11 for LOIs [2023-04-02 22:51:26,728 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:51:26,731 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:51:27,588 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1249#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:51:27,589 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:51:27,589 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:51:27,589 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2023-04-02 22:51:27,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276142015] [2023-04-02 22:51:27,589 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:51:27,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 22:51:27,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:27,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 22:51:27,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=534, Unknown=0, NotChecked=0, Total=650 [2023-04-02 22:51:27,591 INFO L87 Difference]: Start difference. First operand 47 states and 58 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 6 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2023-04-02 22:51:27,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:51:27,696 INFO L93 Difference]: Finished difference Result 109 states and 133 transitions. [2023-04-02 22:51:27,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 22:51:27,696 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 6 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) Word has length 36 [2023-04-02 22:51:27,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:51:27,698 INFO L225 Difference]: With dead ends: 109 [2023-04-02 22:51:27,698 INFO L226 Difference]: Without dead ends: 97 [2023-04-02 22:51:27,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=136, Invalid=676, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:51:27,700 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 44 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:51:27,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 132 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:51:27,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-04-02 22:51:27,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 91. [2023-04-02 22:51:27,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 52 states have internal predecessors, (56), 31 states have call successors, (31), 13 states have call predecessors, (31), 11 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2023-04-02 22:51:27,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 113 transitions. [2023-04-02 22:51:27,734 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 113 transitions. Word has length 36 [2023-04-02 22:51:27,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:51:27,737 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 113 transitions. [2023-04-02 22:51:27,737 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 6 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2023-04-02 22:51:27,737 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 113 transitions. [2023-04-02 22:51:27,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-02 22:51:27,739 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:27,739 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:51:27,751 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 22:51:27,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:27,945 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:27,945 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:27,946 INFO L85 PathProgramCache]: Analyzing trace with hash 1866839880, now seen corresponding path program 1 times [2023-04-02 22:51:27,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:27,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145130294] [2023-04-02 22:51:27,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:27,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:27,954 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:51:27,954 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [655262123] [2023-04-02 22:51:27,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:27,954 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:27,954 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:51:27,955 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 22:51:27,958 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 22:51:28,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:51:28,003 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 25 conjunts are in the unsatisfiable core [2023-04-02 22:51:28,005 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:51:28,167 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:51:28,167 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:51:28,345 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-02 22:51:28,346 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:28,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145130294] [2023-04-02 22:51:28,346 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:51:28,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655262123] [2023-04-02 22:51:28,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655262123] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:51:28,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1535734432] [2023-04-02 22:51:28,348 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 22:51:28,348 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:51:28,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:51:28,349 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:51:28,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:51:28,371 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:51:30,214 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-04-02 22:51:30,225 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 11 for LOIs [2023-04-02 22:51:30,226 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:51:30,229 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:51:30,943 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1800#(and (<= 1 |#StackHeapBarrier|) (<= ~counter~0 50) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:51:30,943 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:51:30,943 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:51:30,943 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 11 [2023-04-02 22:51:30,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161797986] [2023-04-02 22:51:30,943 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:51:30,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-02 22:51:30,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:30,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-02 22:51:30,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=566, Unknown=0, NotChecked=0, Total=650 [2023-04-02 22:51:30,945 INFO L87 Difference]: Start difference. First operand 91 states and 113 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-04-02 22:51:31,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:51:31,095 INFO L93 Difference]: Finished difference Result 105 states and 126 transitions. [2023-04-02 22:51:31,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 22:51:31,096 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 36 [2023-04-02 22:51:31,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:51:31,097 INFO L225 Difference]: With dead ends: 105 [2023-04-02 22:51:31,097 INFO L226 Difference]: Without dead ends: 103 [2023-04-02 22:51:31,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 80 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=100, Invalid=656, Unknown=0, NotChecked=0, Total=756 [2023-04-02 22:51:31,098 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 19 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:51:31,099 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 134 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:51:31,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-04-02 22:51:31,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2023-04-02 22:51:31,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 57 states have (on average 1.1403508771929824) internal successors, (65), 61 states have internal predecessors, (65), 31 states have call successors, (31), 16 states have call predecessors, (31), 14 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2023-04-02 22:51:31,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 122 transitions. [2023-04-02 22:51:31,114 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 122 transitions. Word has length 36 [2023-04-02 22:51:31,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:51:31,115 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 122 transitions. [2023-04-02 22:51:31,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-04-02 22:51:31,115 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 122 transitions. [2023-04-02 22:51:31,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-02 22:51:31,116 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:31,116 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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 22:51:31,121 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 22:51:31,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:31,322 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:31,322 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:31,322 INFO L85 PathProgramCache]: Analyzing trace with hash -540762700, now seen corresponding path program 1 times [2023-04-02 22:51:31,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:31,322 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763967001] [2023-04-02 22:51:31,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:31,322 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:31,329 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:51:31,329 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1210671219] [2023-04-02 22:51:31,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:31,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:31,330 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:51:31,331 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 22:51:31,333 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 22:51:31,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:51:31,371 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 22:51:31,372 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:51:31,429 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-02 22:51:31,429 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:51:31,522 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-02 22:51:31,523 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:31,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763967001] [2023-04-02 22:51:31,523 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:51:31,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210671219] [2023-04-02 22:51:31,523 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210671219] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:51:31,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [608230296] [2023-04-02 22:51:31,525 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-04-02 22:51:31,525 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:51:31,525 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:51:31,525 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:51:31,525 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:51:31,541 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:51:31,772 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-04-02 22:51:31,775 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 11 for LOIs [2023-04-02 22:51:31,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:51:31,779 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:51:32,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [608230296] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:51:32,099 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:51:32,100 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [9, 8] total 26 [2023-04-02 22:51:32,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930951130] [2023-04-02 22:51:32,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:51:32,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-02 22:51:32,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:32,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-02 22:51:32,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=552, Unknown=0, NotChecked=0, Total=650 [2023-04-02 22:51:32,101 INFO L87 Difference]: Start difference. First operand 103 states and 122 transitions. Second operand has 16 states, 10 states have (on average 1.2) internal successors, (12), 9 states have internal predecessors, (12), 6 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2023-04-02 22:51:32,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:51:32,726 INFO L93 Difference]: Finished difference Result 105 states and 123 transitions. [2023-04-02 22:51:32,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-02 22:51:32,726 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 10 states have (on average 1.2) internal successors, (12), 9 states have internal predecessors, (12), 6 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 39 [2023-04-02 22:51:32,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:51:32,727 INFO L225 Difference]: With dead ends: 105 [2023-04-02 22:51:32,727 INFO L226 Difference]: Without dead ends: 95 [2023-04-02 22:51:32,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=177, Invalid=945, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 22:51:32,728 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 17 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:51:32,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 32 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:51:32,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-04-02 22:51:32,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2023-04-02 22:51:32,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 52 states have (on average 1.1346153846153846) internal successors, (59), 56 states have internal predecessors, (59), 29 states have call successors, (29), 14 states have call predecessors, (29), 13 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2023-04-02 22:51:32,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 113 transitions. [2023-04-02 22:51:32,742 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 113 transitions. Word has length 39 [2023-04-02 22:51:32,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:51:32,742 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 113 transitions. [2023-04-02 22:51:32,742 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 10 states have (on average 1.2) internal successors, (12), 9 states have internal predecessors, (12), 6 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2023-04-02 22:51:32,743 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 113 transitions. [2023-04-02 22:51:32,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-02 22:51:32,743 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:32,743 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:51:32,751 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 22:51:32,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:32,949 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:32,949 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:32,949 INFO L85 PathProgramCache]: Analyzing trace with hash 712466189, now seen corresponding path program 2 times [2023-04-02 22:51:32,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:32,949 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18303375] [2023-04-02 22:51:32,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:32,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:32,955 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:51:32,955 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1027864967] [2023-04-02 22:51:32,955 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:51:32,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:32,956 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:51:32,957 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 22:51:32,959 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 22:51:33,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 22:51:33,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:51:33,006 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 31 conjunts are in the unsatisfiable core [2023-04-02 22:51:33,008 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:51:33,344 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-04-02 22:51:33,345 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:51:33,543 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-04-02 22:51:33,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:33,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18303375] [2023-04-02 22:51:33,544 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:51:33,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027864967] [2023-04-02 22:51:33,544 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027864967] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:51:33,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1122232946] [2023-04-02 22:51:33,545 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 22:51:33,545 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:51:33,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:51:33,546 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:51:33,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:51:33,558 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:51:34,911 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-04-02 22:51:34,917 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 11 for LOIs [2023-04-02 22:51:34,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:51:34,922 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:51:35,826 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2961#(and (<= 1 |#StackHeapBarrier|) (<= ~counter~0 50) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:51:35,826 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:51:35,826 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:51:35,826 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2023-04-02 22:51:35,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820058513] [2023-04-02 22:51:35,826 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:51:35,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 22:51:35,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:35,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 22:51:35,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=705, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:51:35,828 INFO L87 Difference]: Start difference. First operand 95 states and 113 transitions. Second operand has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (13), 7 states have call predecessors, (13), 7 states have call successors, (13) [2023-04-02 22:51:37,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:51:37,425 INFO L93 Difference]: Finished difference Result 108 states and 127 transitions. [2023-04-02 22:51:37,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 22:51:37,425 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (13), 7 states have call predecessors, (13), 7 states have call successors, (13) Word has length 41 [2023-04-02 22:51:37,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:51:37,426 INFO L225 Difference]: With dead ends: 108 [2023-04-02 22:51:37,426 INFO L226 Difference]: Without dead ends: 106 [2023-04-02 22:51:37,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 91 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=149, Invalid=973, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 22:51:37,427 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 32 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:51:37,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 134 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 22:51:37,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2023-04-02 22:51:37,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 103. [2023-04-02 22:51:37,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 62 states have internal predecessors, (65), 29 states have call successors, (29), 16 states have call predecessors, (29), 15 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2023-04-02 22:51:37,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 119 transitions. [2023-04-02 22:51:37,445 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 119 transitions. Word has length 41 [2023-04-02 22:51:37,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:51:37,445 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 119 transitions. [2023-04-02 22:51:37,445 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (13), 7 states have call predecessors, (13), 7 states have call successors, (13) [2023-04-02 22:51:37,445 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 119 transitions. [2023-04-02 22:51:37,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-02 22:51:37,446 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:37,446 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:51:37,456 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 22:51:37,651 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:37,652 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:37,652 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:37,652 INFO L85 PathProgramCache]: Analyzing trace with hash 259908136, now seen corresponding path program 3 times [2023-04-02 22:51:37,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:37,652 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848772901] [2023-04-02 22:51:37,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:37,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:37,661 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:51:37,661 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [610547017] [2023-04-02 22:51:37,661 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:51:37,661 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:37,661 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:51:37,670 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 22:51:37,673 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 22:51:37,718 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:51:37,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:51:37,719 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 39 conjunts are in the unsatisfiable core [2023-04-02 22:51:37,721 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:51:38,090 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 16 proven. 18 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-04-02 22:51:38,090 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:51:38,552 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 20 proven. 13 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-02 22:51:38,552 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:38,553 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848772901] [2023-04-02 22:51:38,553 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:51:38,553 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [610547017] [2023-04-02 22:51:38,553 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [610547017] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:51:38,553 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [502878193] [2023-04-02 22:51:38,555 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 22:51:38,555 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:51:38,555 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:51:38,555 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:51:38,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:51:38,570 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:51:39,971 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-04-02 22:51:39,977 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 11 for LOIs [2023-04-02 22:51:39,978 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:51:39,981 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:51:41,117 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3590#(and (<= 1 |#StackHeapBarrier|) (<= ~counter~0 50) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:51:41,118 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:51:41,118 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:51:41,118 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 17 [2023-04-02 22:51:41,118 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934374397] [2023-04-02 22:51:41,118 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:51:41,118 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 22:51:41,118 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:41,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 22:51:41,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=878, Unknown=0, NotChecked=0, Total=992 [2023-04-02 22:51:41,120 INFO L87 Difference]: Start difference. First operand 103 states and 119 transitions. Second operand has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 8 states have call successors, (15) [2023-04-02 22:51:41,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:51:41,745 INFO L93 Difference]: Finished difference Result 120 states and 137 transitions. [2023-04-02 22:51:41,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 22:51:41,745 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 8 states have call successors, (15) Word has length 46 [2023-04-02 22:51:41,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:51:41,746 INFO L225 Difference]: With dead ends: 120 [2023-04-02 22:51:41,747 INFO L226 Difference]: Without dead ends: 106 [2023-04-02 22:51:41,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 105 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=168, Invalid=1238, Unknown=0, NotChecked=0, Total=1406 [2023-04-02 22:51:41,748 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 37 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 22:51:41,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 118 Invalid, 342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 22:51:41,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2023-04-02 22:51:41,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 97. [2023-04-02 22:51:41,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 62 states have internal predecessors, (65), 21 states have call successors, (21), 17 states have call predecessors, (21), 15 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2023-04-02 22:51:41,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 104 transitions. [2023-04-02 22:51:41,764 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 104 transitions. Word has length 46 [2023-04-02 22:51:41,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:51:41,765 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 104 transitions. [2023-04-02 22:51:41,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 8 states have call successors, (15) [2023-04-02 22:51:41,765 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 104 transitions. [2023-04-02 22:51:41,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-04-02 22:51:41,766 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:41,766 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:51:41,775 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 22:51:41,973 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,SelfDestructingSolverStorable9 [2023-04-02 22:51:41,974 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:41,974 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:41,974 INFO L85 PathProgramCache]: Analyzing trace with hash -385420661, now seen corresponding path program 1 times [2023-04-02 22:51:41,974 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:41,974 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679057844] [2023-04-02 22:51:41,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:41,974 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:41,981 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:51:41,981 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1753168210] [2023-04-02 22:51:41,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:41,982 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:41,982 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:51:41,983 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 22:51:41,985 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 22:51:42,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:51:42,035 INFO L262 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 22:51:42,036 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:51:42,093 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 41 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 22:51:42,093 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:51:42,182 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 41 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 22:51:42,182 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:42,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679057844] [2023-04-02 22:51:42,182 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:51:42,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753168210] [2023-04-02 22:51:42,182 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753168210] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:51:42,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2109561612] [2023-04-02 22:51:42,184 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-04-02 22:51:42,184 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:51:42,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:51:42,184 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:51:42,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:51:42,207 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:51:43,320 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2023-04-02 22:51:43,325 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 11 for LOIs [2023-04-02 22:51:43,326 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:51:43,329 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:51:44,291 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4287#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:51:44,291 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:51:44,291 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:51:44,291 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2023-04-02 22:51:44,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488145804] [2023-04-02 22:51:44,292 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:51:44,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-02 22:51:44,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:44,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-02 22:51:44,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=763, Unknown=0, NotChecked=0, Total=870 [2023-04-02 22:51:44,293 INFO L87 Difference]: Start difference. First operand 97 states and 104 transitions. Second operand has 12 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-04-02 22:51:44,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:51:44,404 INFO L93 Difference]: Finished difference Result 108 states and 113 transitions. [2023-04-02 22:51:44,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 22:51:44,404 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) Word has length 57 [2023-04-02 22:51:44,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:51:44,405 INFO L225 Difference]: With dead ends: 108 [2023-04-02 22:51:44,405 INFO L226 Difference]: Without dead ends: 88 [2023-04-02 22:51:44,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=123, Invalid=869, Unknown=0, NotChecked=0, Total=992 [2023-04-02 22:51:44,406 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 17 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:51:44,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 63 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:51:44,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-04-02 22:51:44,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2023-04-02 22:51:44,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 56 states have internal predecessors, (57), 18 states have call successors, (18), 15 states have call predecessors, (18), 14 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:51:44,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2023-04-02 22:51:44,418 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 57 [2023-04-02 22:51:44,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:51:44,419 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2023-04-02 22:51:44,419 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-04-02 22:51:44,419 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2023-04-02 22:51:44,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-04-02 22:51:44,420 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:51:44,420 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:51:44,427 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-04-02 22:51:44,625 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:44,625 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:51:44,626 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:51:44,626 INFO L85 PathProgramCache]: Analyzing trace with hash -2051121797, now seen corresponding path program 4 times [2023-04-02 22:51:44,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:51:44,626 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937097023] [2023-04-02 22:51:44,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:51:44,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:51:44,633 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:51:44,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [214257982] [2023-04-02 22:51:44,634 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:51:44,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:51:44,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:51:44,635 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:51:44,637 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 22:51:44,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:51:44,706 INFO L262 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 49 conjunts are in the unsatisfiable core [2023-04-02 22:51:44,708 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:51:47,232 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 68 proven. 45 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2023-04-02 22:51:47,232 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:51:49,683 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 68 proven. 45 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2023-04-02 22:51:49,684 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:51:49,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937097023] [2023-04-02 22:51:49,684 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:51:49,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [214257982] [2023-04-02 22:51:49,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [214257982] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:51:49,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1939898718] [2023-04-02 22:51:49,686 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 22:51:49,686 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:51:49,686 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:51:49,686 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:51:49,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:51:49,702 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:51:51,045 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-04-02 22:51:51,049 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 11 for LOIs [2023-04-02 22:51:51,050 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:51:51,052 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:51:56,705 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5071#(and (<= 1 |#StackHeapBarrier|) (<= ~counter~0 50) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:51:56,705 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:51:56,705 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:51:56,705 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2023-04-02 22:51:56,705 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9991554] [2023-04-02 22:51:56,705 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:51:56,706 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-02 22:51:56,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:51:56,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-02 22:51:56,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1250, Unknown=0, NotChecked=0, Total=1406 [2023-04-02 22:51:56,707 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand has 23 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 16 states have internal predecessors, (41), 14 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 13 states have call predecessors, (25), 12 states have call successors, (25) [2023-04-02 22:52:01,610 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.45s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:52:03,859 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:52:05,863 WARN L539 Checker$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 22:52:06,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:52:06,903 INFO L93 Difference]: Finished difference Result 107 states and 114 transitions. [2023-04-02 22:52:06,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-02 22:52:06,904 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 16 states have internal predecessors, (41), 14 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 13 states have call predecessors, (25), 12 states have call successors, (25) Word has length 77 [2023-04-02 22:52:06,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:52:06,905 INFO L225 Difference]: With dead ends: 107 [2023-04-02 22:52:06,905 INFO L226 Difference]: Without dead ends: 105 [2023-04-02 22:52:06,905 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 183 SyntacticMatches, 12 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=246, Invalid=1734, Unknown=0, NotChecked=0, Total=1980 [2023-04-02 22:52:06,906 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 54 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 74 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:52:06,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 184 Invalid, 486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 410 Invalid, 2 Unknown, 0 Unchecked, 7.1s Time] [2023-04-02 22:52:06,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-04-02 22:52:06,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 92. [2023-04-02 22:52:06,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 59 states have internal predecessors, (60), 18 states have call successors, (18), 16 states have call predecessors, (18), 15 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:52:06,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2023-04-02 22:52:06,926 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 77 [2023-04-02 22:52:06,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:52:06,927 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2023-04-02 22:52:06,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 16 states have internal predecessors, (41), 14 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 13 states have call predecessors, (25), 12 states have call successors, (25) [2023-04-02 22:52:06,927 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2023-04-02 22:52:06,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2023-04-02 22:52:06,928 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:52:06,928 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:52:06,934 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 22:52:07,133 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-02 22:52:07,134 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:52:07,134 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:52:07,134 INFO L85 PathProgramCache]: Analyzing trace with hash -14329509, now seen corresponding path program 2 times [2023-04-02 22:52:07,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:52:07,134 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286869516] [2023-04-02 22:52:07,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:52:07,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:52:07,150 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:52:07,151 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1220352134] [2023-04-02 22:52:07,151 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:52:07,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:52:07,151 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:52:07,152 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:52:07,154 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 22:52:07,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-02 22:52:07,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:52:07,242 INFO L262 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 13 conjunts are in the unsatisfiable core [2023-04-02 22:52:07,244 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:52:07,337 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 260 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-04-02 22:52:07,337 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:52:07,433 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 44 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2023-04-02 22:52:07,433 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:52:07,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286869516] [2023-04-02 22:52:07,433 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:52:07,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220352134] [2023-04-02 22:52:07,433 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220352134] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:52:07,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [932991463] [2023-04-02 22:52:07,434 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 22:52:07,434 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:52:07,435 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:52:07,435 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:52:07,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:52:07,447 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:52:08,544 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2023-04-02 22:52:08,547 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 11 for LOIs [2023-04-02 22:52:08,548 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:52:08,551 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:52:09,245 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5937#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:52:09,245 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:52:09,245 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:52:09,246 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2023-04-02 22:52:09,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746606369] [2023-04-02 22:52:09,246 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:52:09,246 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 22:52:09,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:52:09,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 22:52:09,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=783, Unknown=0, NotChecked=0, Total=992 [2023-04-02 22:52:09,247 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 12 states have call successors, (32), 8 states have call predecessors, (32), 7 states have return successors, (30), 10 states have call predecessors, (30), 11 states have call successors, (30) [2023-04-02 22:52:09,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:52:09,470 INFO L93 Difference]: Finished difference Result 208 states and 216 transitions. [2023-04-02 22:52:09,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-02 22:52:09,470 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 12 states have call successors, (32), 8 states have call predecessors, (32), 7 states have return successors, (30), 10 states have call predecessors, (30), 11 states have call successors, (30) Word has length 90 [2023-04-02 22:52:09,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:52:09,472 INFO L225 Difference]: With dead ends: 208 [2023-04-02 22:52:09,472 INFO L226 Difference]: Without dead ends: 200 [2023-04-02 22:52:09,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 239 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=322, Invalid=1318, Unknown=0, NotChecked=0, Total=1640 [2023-04-02 22:52:09,473 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 47 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:52:09,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 120 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:52:09,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2023-04-02 22:52:09,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 200. [2023-04-02 22:52:09,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 130 states have (on average 1.0153846153846153) internal successors, (132), 131 states have internal predecessors, (132), 36 states have call successors, (36), 34 states have call predecessors, (36), 33 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-04-02 22:52:09,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 202 transitions. [2023-04-02 22:52:09,515 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 202 transitions. Word has length 90 [2023-04-02 22:52:09,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:52:09,515 INFO L495 AbstractCegarLoop]: Abstraction has 200 states and 202 transitions. [2023-04-02 22:52:09,515 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 12 states have call successors, (32), 8 states have call predecessors, (32), 7 states have return successors, (30), 10 states have call predecessors, (30), 11 states have call successors, (30) [2023-04-02 22:52:09,515 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 202 transitions. [2023-04-02 22:52:09,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2023-04-02 22:52:09,517 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:52:09,517 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 11, 10, 10, 10, 10, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:52:09,522 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-02 22:52:09,718 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-02 22:52:09,719 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:52:09,719 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:52:09,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1573716049, now seen corresponding path program 3 times [2023-04-02 22:52:09,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:52:09,719 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958012295] [2023-04-02 22:52:09,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:52:09,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:52:09,730 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:52:09,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [172120611] [2023-04-02 22:52:09,730 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:52:09,730 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:52:09,730 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:52:09,731 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:52:09,734 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 22:52:09,844 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:52:09,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:52:09,846 INFO L262 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 25 conjunts are in the unsatisfiable core [2023-04-02 22:52:09,849 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:52:10,082 INFO L134 CoverageAnalysis]: Checked inductivity of 2092 backedges. 60 proven. 1910 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2023-04-02 22:52:10,083 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:52:10,357 INFO L134 CoverageAnalysis]: Checked inductivity of 2092 backedges. 60 proven. 290 refuted. 0 times theorem prover too weak. 1742 trivial. 0 not checked. [2023-04-02 22:52:10,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:52:10,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958012295] [2023-04-02 22:52:10,357 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:52:10,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172120611] [2023-04-02 22:52:10,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172120611] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:52:10,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [745911619] [2023-04-02 22:52:10,359 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 22:52:10,359 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:52:10,359 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:52:10,359 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:52:10,359 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:52:10,378 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:52:11,305 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2023-04-02 22:52:11,308 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 11 for LOIs [2023-04-02 22:52:11,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:52:11,312 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:52:12,073 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7757#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:52:12,074 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:52:12,074 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:52:12,074 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2023-04-02 22:52:12,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054901855] [2023-04-02 22:52:12,074 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:52:12,077 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-02 22:52:12,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:52:12,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-02 22:52:12,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=503, Invalid=1389, Unknown=0, NotChecked=0, Total=1892 [2023-04-02 22:52:12,079 INFO L87 Difference]: Start difference. First operand 200 states and 202 transitions. Second operand has 26 states, 26 states have (on average 4.153846153846154) internal successors, (108), 26 states have internal predecessors, (108), 24 states have call successors, (68), 14 states have call predecessors, (68), 13 states have return successors, (66), 22 states have call predecessors, (66), 23 states have call successors, (66) [2023-04-02 22:52:12,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:52:12,649 INFO L93 Difference]: Finished difference Result 424 states and 438 transitions. [2023-04-02 22:52:12,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-04-02 22:52:12,649 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.153846153846154) internal successors, (108), 26 states have internal predecessors, (108), 24 states have call successors, (68), 14 states have call predecessors, (68), 13 states have return successors, (66), 22 states have call predecessors, (66), 23 states have call successors, (66) Word has length 198 [2023-04-02 22:52:12,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:52:12,651 INFO L225 Difference]: With dead ends: 424 [2023-04-02 22:52:12,651 INFO L226 Difference]: Without dead ends: 416 [2023-04-02 22:52:12,652 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 551 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1018, Invalid=3142, Unknown=0, NotChecked=0, Total=4160 [2023-04-02 22:52:12,653 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 92 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:52:12,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 154 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:52:12,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2023-04-02 22:52:12,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 416. [2023-04-02 22:52:12,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 416 states, 274 states have (on average 1.0072992700729928) internal successors, (276), 275 states have internal predecessors, (276), 72 states have call successors, (72), 70 states have call predecessors, (72), 69 states have return successors, (70), 70 states have call predecessors, (70), 70 states have call successors, (70) [2023-04-02 22:52:12,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 418 transitions. [2023-04-02 22:52:12,733 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 418 transitions. Word has length 198 [2023-04-02 22:52:12,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:52:12,734 INFO L495 AbstractCegarLoop]: Abstraction has 416 states and 418 transitions. [2023-04-02 22:52:12,734 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.153846153846154) internal successors, (108), 26 states have internal predecessors, (108), 24 states have call successors, (68), 14 states have call predecessors, (68), 13 states have return successors, (66), 22 states have call predecessors, (66), 23 states have call successors, (66) [2023-04-02 22:52:12,734 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 418 transitions. [2023-04-02 22:52:12,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2023-04-02 22:52:12,738 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:52:12,739 INFO L195 NwaCegarLoop]: trace histogram [67, 66, 66, 23, 22, 22, 22, 22, 22, 22, 22, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:52:12,745 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-02 22:52:12,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-02 22:52:12,945 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:52:12,945 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:52:12,945 INFO L85 PathProgramCache]: Analyzing trace with hash 79393597, now seen corresponding path program 4 times [2023-04-02 22:52:12,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:52:12,945 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038929092] [2023-04-02 22:52:12,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:52:12,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:52:12,967 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:52:12,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1992595765] [2023-04-02 22:52:12,967 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:52:12,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:52:12,967 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:52:12,968 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:52:12,974 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 22:52:13,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:52:13,119 INFO L262 TraceCheckSpWp]: Trace formula consists of 842 conjuncts, 49 conjunts are in the unsatisfiable core [2023-04-02 22:52:13,126 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:52:13,695 INFO L134 CoverageAnalysis]: Checked inductivity of 10144 backedges. 132 proven. 9746 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2023-04-02 22:52:13,696 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:52:14,577 INFO L134 CoverageAnalysis]: Checked inductivity of 10144 backedges. 132 proven. 1430 refuted. 0 times theorem prover too weak. 8582 trivial. 0 not checked. [2023-04-02 22:52:14,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:52:14,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038929092] [2023-04-02 22:52:14,577 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:52:14,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992595765] [2023-04-02 22:52:14,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992595765] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:52:14,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [568757853] [2023-04-02 22:52:14,579 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 22:52:14,579 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:52:14,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:52:14,579 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:52:14,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:52:14,591 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:52:15,473 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2023-04-02 22:52:15,477 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 11 for LOIs [2023-04-02 22:52:15,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:52:15,480 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:52:16,310 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11521#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:52:16,310 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:52:16,310 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:52:16,310 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2023-04-02 22:52:16,310 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409423557] [2023-04-02 22:52:16,310 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:52:16,311 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-04-02 22:52:16,311 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:52:16,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-04-02 22:52:16,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1523, Invalid=3033, Unknown=0, NotChecked=0, Total=4556 [2023-04-02 22:52:16,314 INFO L87 Difference]: Start difference. First operand 416 states and 418 transitions. Second operand has 50 states, 50 states have (on average 4.32) internal successors, (216), 50 states have internal predecessors, (216), 48 states have call successors, (140), 26 states have call predecessors, (140), 25 states have return successors, (138), 46 states have call predecessors, (138), 47 states have call successors, (138) [2023-04-02 22:52:17,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:52:17,990 INFO L93 Difference]: Finished difference Result 856 states and 882 transitions. [2023-04-02 22:52:17,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2023-04-02 22:52:17,991 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.32) internal successors, (216), 50 states have internal predecessors, (216), 48 states have call successors, (140), 26 states have call predecessors, (140), 25 states have return successors, (138), 46 states have call predecessors, (138), 47 states have call successors, (138) Word has length 414 [2023-04-02 22:52:17,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:52:17,995 INFO L225 Difference]: With dead ends: 856 [2023-04-02 22:52:17,995 INFO L226 Difference]: Without dead ends: 848 [2023-04-02 22:52:17,998 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1286 GetRequests, 1175 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3401 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3706, Invalid=8950, Unknown=0, NotChecked=0, Total=12656 [2023-04-02 22:52:17,999 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 230 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:52:17,999 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [230 Valid, 256 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 22:52:18,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 848 states. [2023-04-02 22:52:18,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 848 to 848. [2023-04-02 22:52:18,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 848 states, 562 states have (on average 1.00355871886121) internal successors, (564), 563 states have internal predecessors, (564), 144 states have call successors, (144), 142 states have call predecessors, (144), 141 states have return successors, (142), 142 states have call predecessors, (142), 142 states have call successors, (142) [2023-04-02 22:52:18,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 848 states to 848 states and 850 transitions. [2023-04-02 22:52:18,179 INFO L78 Accepts]: Start accepts. Automaton has 848 states and 850 transitions. Word has length 414 [2023-04-02 22:52:18,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:52:18,180 INFO L495 AbstractCegarLoop]: Abstraction has 848 states and 850 transitions. [2023-04-02 22:52:18,180 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.32) internal successors, (216), 50 states have internal predecessors, (216), 48 states have call successors, (140), 26 states have call predecessors, (140), 25 states have return successors, (138), 46 states have call predecessors, (138), 47 states have call successors, (138) [2023-04-02 22:52:18,181 INFO L276 IsEmpty]: Start isEmpty. Operand 848 states and 850 transitions. [2023-04-02 22:52:18,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 847 [2023-04-02 22:52:18,201 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:52:18,201 INFO L195 NwaCegarLoop]: trace histogram [139, 138, 138, 47, 46, 46, 46, 46, 46, 46, 46, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:52:18,209 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-02 22:52:18,409 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-04-02 22:52:18,409 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:52:18,409 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:52:18,410 INFO L85 PathProgramCache]: Analyzing trace with hash 440331541, now seen corresponding path program 5 times [2023-04-02 22:52:18,410 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:52:18,410 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31138575] [2023-04-02 22:52:18,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:52:18,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:52:18,442 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:52:18,442 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [651284944] [2023-04-02 22:52:18,442 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:52:18,443 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:52:18,443 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:52:18,445 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:52:18,454 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process