/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:39:05,148 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:39:05,150 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:39:05,188 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:39:05,188 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:39:05,191 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:39:05,194 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:39:05,196 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:39:05,200 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:39:05,204 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:39:05,205 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:39:05,206 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:39:05,207 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:39:05,208 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:39:05,209 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:39:05,210 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:39:05,210 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:39:05,211 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:39:05,214 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:39:05,219 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:39:05,220 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:39:05,221 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:39:05,222 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:39:05,223 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:39:05,230 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 22:39:05,233 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:39:05,234 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:39:05,235 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:39:05,236 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:39:05,236 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:39:05,236 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:39:05,237 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:39:05,237 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:39:05,237 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:39:05,238 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:39:05,238 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:39:05,239 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 22:39:05,266 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:39:05,266 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:39:05,267 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:39:05,267 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:39:05,268 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:39:05,268 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:39:05,268 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:39:05,268 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:39:05,268 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:39:05,268 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:39:05,269 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:39:05,269 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:39:05,269 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:39:05,269 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:39:05,269 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:39:05,270 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:39:05,270 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:39:05,270 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:39:05,270 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:39:05,270 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:39:05,270 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:39:05,271 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:39:05,271 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:39:05,271 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:39:05,271 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:39:05,271 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:39:05,271 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:39:05,271 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:39:05,272 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:39:05,272 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:39:05,272 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:39:05,272 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:39:05,272 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:39:05,272 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:39:05,272 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:39:05,272 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:39:05,273 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:39:05,273 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:39:05,273 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:39:05,273 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:39:05,273 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:39:05,273 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:39:05,450 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:39:05,469 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:39:05,471 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:39:05,472 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:39:05,473 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:39:05,474 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound20.c [2023-04-02 22:39:06,643 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:39:06,815 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:39:06,815 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound20.c [2023-04-02 22:39:06,820 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/242f108b0/19caa9bc339b47ed8efea4cd5283c8f3/FLAG734382660 [2023-04-02 22:39:06,834 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/242f108b0/19caa9bc339b47ed8efea4cd5283c8f3 [2023-04-02 22:39:06,837 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:39:06,838 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:39:06,841 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:39:06,841 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:39:06,844 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:39:06,844 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:39:06" (1/1) ... [2023-04-02 22:39:06,845 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14988317 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:06, skipping insertion in model container [2023-04-02 22:39:06,846 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:39:06" (1/1) ... [2023-04-02 22:39:06,851 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:39:06,871 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:39:07,000 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound20.c[525,538] [2023-04-02 22:39:07,035 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:39:07,042 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:39:07,053 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound20.c[525,538] [2023-04-02 22:39:07,068 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:39:07,079 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:39:07,079 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:07 WrapperNode [2023-04-02 22:39:07,080 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:39:07,080 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:39:07,081 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:39:07,081 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:39:07,090 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:07" (1/1) ... [2023-04-02 22:39:07,090 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:07" (1/1) ... [2023-04-02 22:39:07,095 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:07" (1/1) ... [2023-04-02 22:39:07,095 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:07" (1/1) ... [2023-04-02 22:39:07,100 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:07" (1/1) ... [2023-04-02 22:39:07,110 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:07" (1/1) ... [2023-04-02 22:39:07,117 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:07" (1/1) ... [2023-04-02 22:39:07,118 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:07" (1/1) ... [2023-04-02 22:39:07,119 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:39:07,120 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:39:07,120 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:39:07,120 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:39:07,121 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:07" (1/1) ... [2023-04-02 22:39:07,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:39:07,135 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:07,147 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 22:39:07,163 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 22:39:07,184 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:39:07,185 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:39:07,185 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:39:07,190 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 22:39:07,190 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:39:07,190 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:39:07,190 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:39:07,190 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:39:07,191 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:39:07,191 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:39:07,191 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2023-04-02 22:39:07,191 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 22:39:07,191 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:39:07,191 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:39:07,191 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:39:07,191 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:39:07,192 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:39:07,192 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:39:07,192 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:39:07,192 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:39:07,249 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:39:07,251 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:39:07,594 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:39:07,658 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:39:07,658 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-02 22:39:07,660 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:39:07 BoogieIcfgContainer [2023-04-02 22:39:07,660 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:39:07,662 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:39:07,662 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:39:07,669 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:39:07,669 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:39:06" (1/3) ... [2023-04-02 22:39:07,670 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@736ecd44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:39:07, skipping insertion in model container [2023-04-02 22:39:07,670 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:39:07" (2/3) ... [2023-04-02 22:39:07,670 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@736ecd44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:39:07, skipping insertion in model container [2023-04-02 22:39:07,670 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:39:07" (3/3) ... [2023-04-02 22:39:07,671 INFO L112 eAbstractionObserver]: Analyzing ICFG dijkstra-u_unwindbound20.c [2023-04-02 22:39:07,686 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:39:07,687 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:39:07,737 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:39:07,745 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;@2eb26d63, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:39:07,745 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:39:07,748 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-02 22:39:07,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-02 22:39:07,755 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:07,756 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:07,757 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:07,762 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:07,762 INFO L85 PathProgramCache]: Analyzing trace with hash -1529025729, now seen corresponding path program 1 times [2023-04-02 22:39:07,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:07,770 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397682164] [2023-04-02 22:39:07,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:07,771 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:07,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:07,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:07,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397682164] [2023-04-02 22:39:07,928 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-04-02 22:39:07,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035175616] [2023-04-02 22:39:07,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:07,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:07,930 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:07,941 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:39:07,944 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 22:39:08,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:08,025 INFO L262 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 1 conjunts are in the unsatisfiable core [2023-04-02 22:39:08,028 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:08,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:08,050 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:39:08,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035175616] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:08,051 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:39:08,051 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-04-02 22:39:08,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644682156] [2023-04-02 22:39:08,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:08,060 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-04-02 22:39:08,061 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:08,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-04-02 22:39:08,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 22:39:08,099 INFO L87 Difference]: Start difference. First operand has 34 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 22:39:08,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:08,146 INFO L93 Difference]: Finished difference Result 56 states and 90 transitions. [2023-04-02 22:39:08,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-04-02 22:39:08,149 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2023-04-02 22:39:08,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:08,155 INFO L225 Difference]: With dead ends: 56 [2023-04-02 22:39:08,155 INFO L226 Difference]: Without dead ends: 30 [2023-04-02 22:39:08,160 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 22:39:08,164 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:08,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 41 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:39:08,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-04-02 22:39:08,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-04-02 22:39:08,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 22:39:08,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2023-04-02 22:39:08,206 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 15 [2023-04-02 22:39:08,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:08,206 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2023-04-02 22:39:08,207 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 22:39:08,207 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2023-04-02 22:39:08,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-02 22:39:08,208 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:08,208 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:08,216 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 22:39:08,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-04-02 22:39:08,414 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:08,415 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:08,415 INFO L85 PathProgramCache]: Analyzing trace with hash -1095400856, now seen corresponding path program 1 times [2023-04-02 22:39:08,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:08,415 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145306802] [2023-04-02 22:39:08,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:08,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:08,429 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:08,429 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1765678070] [2023-04-02 22:39:08,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:08,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:08,429 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:08,431 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:39:08,434 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 22:39:08,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:08,498 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-02 22:39:08,500 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:08,545 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:08,545 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:39:08,545 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:08,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145306802] [2023-04-02 22:39:08,546 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:39:08,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1765678070] [2023-04-02 22:39:08,546 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1765678070] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:08,546 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:39:08,546 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 22:39:08,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042413819] [2023-04-02 22:39:08,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:08,547 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 22:39:08,547 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:08,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 22:39:08,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-02 22:39:08,548 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:08,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:08,573 INFO L93 Difference]: Finished difference Result 50 states and 71 transitions. [2023-04-02 22:39:08,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 22:39:08,573 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2023-04-02 22:39:08,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:08,574 INFO L225 Difference]: With dead ends: 50 [2023-04-02 22:39:08,574 INFO L226 Difference]: Without dead ends: 32 [2023-04-02 22:39:08,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-02 22:39:08,576 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:08,577 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 100 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:39:08,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-02 22:39:08,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-04-02 22:39:08,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 22:39:08,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 43 transitions. [2023-04-02 22:39:08,583 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 43 transitions. Word has length 17 [2023-04-02 22:39:08,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:08,584 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 43 transitions. [2023-04-02 22:39:08,584 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:08,584 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 43 transitions. [2023-04-02 22:39:08,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-02 22:39:08,585 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:08,585 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:08,595 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 22:39:08,790 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-04-02 22:39:08,791 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:08,791 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:08,791 INFO L85 PathProgramCache]: Analyzing trace with hash 56656903, now seen corresponding path program 1 times [2023-04-02 22:39:08,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:08,795 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431774212] [2023-04-02 22:39:08,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:08,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:08,818 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:08,819 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1015683770] [2023-04-02 22:39:08,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:08,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:08,819 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:08,820 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:39:08,822 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 22:39:08,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:08,872 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 22:39:08,873 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:08,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:08,918 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:39:08,918 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:08,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431774212] [2023-04-02 22:39:08,918 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:39:08,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015683770] [2023-04-02 22:39:08,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015683770] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:08,919 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:39:08,919 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 22:39:08,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873420276] [2023-04-02 22:39:08,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:08,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 22:39:08,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:08,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 22:39:08,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 22:39:08,920 INFO L87 Difference]: Start difference. First operand 32 states and 43 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:08,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:08,953 INFO L93 Difference]: Finished difference Result 45 states and 59 transitions. [2023-04-02 22:39:08,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-02 22:39:08,954 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2023-04-02 22:39:08,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:08,956 INFO L225 Difference]: With dead ends: 45 [2023-04-02 22:39:08,956 INFO L226 Difference]: Without dead ends: 36 [2023-04-02 22:39:08,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-04-02 22:39:08,959 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 1 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:08,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 127 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:39:08,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-04-02 22:39:08,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2023-04-02 22:39:08,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 20 states have internal predecessors, (25), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 22:39:08,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 47 transitions. [2023-04-02 22:39:08,966 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 47 transitions. Word has length 18 [2023-04-02 22:39:08,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:08,966 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 47 transitions. [2023-04-02 22:39:08,966 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:08,966 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 47 transitions. [2023-04-02 22:39:08,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-02 22:39:08,967 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:08,967 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:08,977 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-02 22:39:09,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:09,172 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:09,172 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:09,173 INFO L85 PathProgramCache]: Analyzing trace with hash 58146453, now seen corresponding path program 1 times [2023-04-02 22:39:09,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:09,173 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737176236] [2023-04-02 22:39:09,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:09,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:09,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:09,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:09,612 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:09,612 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737176236] [2023-04-02 22:39:09,613 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737176236] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:09,613 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:39:09,613 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-04-02 22:39:09,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649875952] [2023-04-02 22:39:09,614 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:09,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-04-02 22:39:09,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:09,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-04-02 22:39:09,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-04-02 22:39:09,616 INFO L87 Difference]: Start difference. First operand 35 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 22:39:11,822 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:39:13,831 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:39:13,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:13,867 INFO L93 Difference]: Finished difference Result 67 states and 97 transitions. [2023-04-02 22:39:13,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 22:39:13,867 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2023-04-02 22:39:13,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:13,868 INFO L225 Difference]: With dead ends: 67 [2023-04-02 22:39:13,868 INFO L226 Difference]: Without dead ends: 47 [2023-04-02 22:39:13,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-04-02 22:39:13,870 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 11 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 24 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:13,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 122 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 105 Invalid, 2 Unknown, 0 Unchecked, 4.2s Time] [2023-04-02 22:39:13,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-04-02 22:39:13,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2023-04-02 22:39:13,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 25 states have internal predecessors, (29), 19 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:39:13,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 64 transitions. [2023-04-02 22:39:13,882 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 64 transitions. Word has length 18 [2023-04-02 22:39:13,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:13,883 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 64 transitions. [2023-04-02 22:39:13,883 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-02 22:39:13,883 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 64 transitions. [2023-04-02 22:39:13,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-02 22:39:13,884 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:13,884 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:13,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-02 22:39:13,884 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:13,885 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:13,885 INFO L85 PathProgramCache]: Analyzing trace with hash 45867820, now seen corresponding path program 1 times [2023-04-02 22:39:13,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:13,885 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762608324] [2023-04-02 22:39:13,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:13,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:13,894 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:13,895 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1699223712] [2023-04-02 22:39:13,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:13,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:13,895 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:13,897 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:39:13,905 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 22:39:13,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:13,953 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 22:39:13,955 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:14,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:14,001 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:39:14,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:14,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:14,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762608324] [2023-04-02 22:39:14,058 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:39:14,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699223712] [2023-04-02 22:39:14,058 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699223712] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:39:14,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1299724279] [2023-04-02 22:39:14,080 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 22:39:14,081 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:39:14,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:39:14,087 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:39:14,088 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:39:14,153 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:39:14,372 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-04-02 22:39:14,381 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 25 for LOIs [2023-04-02 22:39:14,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:39:14,405 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:39:14,960 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1299724279] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:14,961 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:39:14,961 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [5, 5] total 22 [2023-04-02 22:39:14,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135144551] [2023-04-02 22:39:14,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:14,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-02 22:39:14,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:14,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-02 22:39:14,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2023-04-02 22:39:14,963 INFO L87 Difference]: Start difference. First operand 47 states and 64 transitions. Second operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:17,938 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:39:25,255 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:27,488 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:27,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:27,613 INFO L93 Difference]: Finished difference Result 75 states and 104 transitions. [2023-04-02 22:39:27,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 22:39:27,614 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2023-04-02 22:39:27,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:27,615 INFO L225 Difference]: With dead ends: 75 [2023-04-02 22:39:27,615 INFO L226 Difference]: Without dead ends: 48 [2023-04-02 22:39:27,616 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=140, Invalid=672, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:39:27,617 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 18 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 569 mSolverCounterSat, 22 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 594 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 569 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:27,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 76 Invalid, 594 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 569 Invalid, 3 Unknown, 0 Unchecked, 12.2s Time] [2023-04-02 22:39:27,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-04-02 22:39:27,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2023-04-02 22:39:27,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 25 states have internal predecessors, (28), 19 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:39:27,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 63 transitions. [2023-04-02 22:39:27,627 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 63 transitions. Word has length 20 [2023-04-02 22:39:27,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:27,628 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 63 transitions. [2023-04-02 22:39:27,628 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:27,628 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 63 transitions. [2023-04-02 22:39:27,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 22:39:27,629 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:27,629 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:27,637 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 22:39:27,834 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:27,834 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:27,835 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:27,835 INFO L85 PathProgramCache]: Analyzing trace with hash 1076247491, now seen corresponding path program 1 times [2023-04-02 22:39:27,835 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:27,835 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963738751] [2023-04-02 22:39:27,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:27,835 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:27,855 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:27,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [573486827] [2023-04-02 22:39:27,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:27,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:27,856 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:27,863 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:39:27,866 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 22:39:27,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:27,906 INFO L262 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 9 conjunts are in the unsatisfiable core [2023-04-02 22:39:27,908 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:27,949 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:27,950 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:39:28,023 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:28,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:28,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963738751] [2023-04-02 22:39:28,024 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:39:28,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [573486827] [2023-04-02 22:39:28,024 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [573486827] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:39:28,026 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [198345693] [2023-04-02 22:39:28,029 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 22:39:28,029 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:39:28,030 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:39:28,030 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:39:28,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:39:28,065 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:39:28,231 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-02 22:39:28,239 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 25 for LOIs [2023-04-02 22:39:28,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:39:28,253 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:39:28,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [198345693] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:28,851 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:39:28,851 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [6, 6] total 24 [2023-04-02 22:39:28,851 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981158050] [2023-04-02 22:39:28,851 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:28,852 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-02 22:39:28,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:28,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-02 22:39:28,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2023-04-02 22:39:28,853 INFO L87 Difference]: Start difference. First operand 47 states and 63 transitions. Second operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:30,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:30,168 INFO L93 Difference]: Finished difference Result 68 states and 95 transitions. [2023-04-02 22:39:30,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-02 22:39:30,169 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2023-04-02 22:39:30,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:30,170 INFO L225 Difference]: With dead ends: 68 [2023-04-02 22:39:30,170 INFO L226 Difference]: Without dead ends: 59 [2023-04-02 22:39:30,170 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2023-04-02 22:39:30,171 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 20 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 552 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 552 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:30,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 22 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 552 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-02 22:39:30,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-04-02 22:39:30,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 49. [2023-04-02 22:39:30,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 25 states have (on average 1.2) internal successors, (30), 27 states have internal predecessors, (30), 19 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:39:30,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 65 transitions. [2023-04-02 22:39:30,192 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 65 transitions. Word has length 21 [2023-04-02 22:39:30,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:30,192 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 65 transitions. [2023-04-02 22:39:30,193 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:30,193 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 65 transitions. [2023-04-02 22:39:30,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 22:39:30,193 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:30,193 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:30,203 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 22:39:30,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:30,404 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:30,404 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:30,404 INFO L85 PathProgramCache]: Analyzing trace with hash 1077737041, now seen corresponding path program 1 times [2023-04-02 22:39:30,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:30,405 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1384959679] [2023-04-02 22:39:30,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:30,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:30,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:30,596 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:30,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:30,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1384959679] [2023-04-02 22:39:30,596 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1384959679] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:39:30,597 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86740798] [2023-04-02 22:39:30,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:30,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:30,598 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:30,599 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:39:30,625 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 22:39:30,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:30,646 INFO L262 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 15 conjunts are in the unsatisfiable core [2023-04-02 22:39:30,647 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:30,741 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:30,741 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:39:30,849 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:39:30,849 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [86740798] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:39:30,849 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [310000873] [2023-04-02 22:39:30,851 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 22:39:30,851 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:39:30,851 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:39:30,851 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:39:30,851 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:39:30,880 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:39:31,017 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2023-04-02 22:39:31,025 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 25 for LOIs [2023-04-02 22:39:31,029 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:39:31,034 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:39:31,707 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [310000873] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:39:31,708 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:39:31,708 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [7, 7, 7] total 28 [2023-04-02 22:39:31,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978686923] [2023-04-02 22:39:31,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:39:31,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-02 22:39:31,709 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:31,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-02 22:39:31,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2023-04-02 22:39:31,710 INFO L87 Difference]: Start difference. First operand 49 states and 65 transitions. Second operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:36,102 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:38,105 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:40,107 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:42,110 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:44,113 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:44,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:44,230 INFO L93 Difference]: Finished difference Result 65 states and 89 transitions. [2023-04-02 22:39:44,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 22:39:44,231 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2023-04-02 22:39:44,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:44,232 INFO L225 Difference]: With dead ends: 65 [2023-04-02 22:39:44,232 INFO L226 Difference]: Without dead ends: 46 [2023-04-02 22:39:44,234 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=170, Invalid=1020, Unknown=0, NotChecked=0, Total=1190 [2023-04-02 22:39:44,234 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 23 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 32 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:44,235 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 33 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 380 Invalid, 5 Unknown, 0 Unchecked, 12.1s Time] [2023-04-02 22:39:44,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-04-02 22:39:44,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-04-02 22:39:44,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 18 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:39:44,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 61 transitions. [2023-04-02 22:39:44,246 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 61 transitions. Word has length 21 [2023-04-02 22:39:44,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:44,247 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 61 transitions. [2023-04-02 22:39:44,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:39:44,247 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 61 transitions. [2023-04-02 22:39:44,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 22:39:44,248 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:44,248 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:44,256 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-02 22:39:44,449 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:44,449 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:44,449 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:44,449 INFO L85 PathProgramCache]: Analyzing trace with hash -2008937068, now seen corresponding path program 1 times [2023-04-02 22:39:44,449 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:44,450 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348213160] [2023-04-02 22:39:44,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:44,450 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:44,460 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:44,460 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1710201042] [2023-04-02 22:39:44,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:44,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:44,461 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:44,462 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:39:44,464 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 22:39:44,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:44,516 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 11 conjunts are in the unsatisfiable core [2023-04-02 22:39:44,520 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:44,596 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 22:39:44,597 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:39:44,703 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 22:39:44,703 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:39:44,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348213160] [2023-04-02 22:39:44,703 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:39:44,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710201042] [2023-04-02 22:39:44,704 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710201042] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:39:44,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1199380090] [2023-04-02 22:39:44,708 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-04-02 22:39:44,709 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:39:44,710 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:39:44,713 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:39:44,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:39:44,733 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:39:45,810 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2023-04-02 22:39:45,821 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 25 for LOIs [2023-04-02 22:39:45,825 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:39:45,829 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:39:46,564 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2143#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (= |#NULL.base| 0))' at error location [2023-04-02 22:39:46,564 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:39:46,564 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:39:46,564 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2023-04-02 22:39:46,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003540540] [2023-04-02 22:39:46,565 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:39:46,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-02 22:39:46,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:39:46,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-02 22:39:46,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=675, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:39:46,566 INFO L87 Difference]: Start difference. First operand 46 states and 61 transitions. Second operand has 12 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2023-04-02 22:39:49,814 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:39:52,640 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:39:57,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:39:57,079 INFO L93 Difference]: Finished difference Result 215 states and 299 transitions. [2023-04-02 22:39:57,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 22:39:57,080 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) Word has length 54 [2023-04-02 22:39:57,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:39:57,082 INFO L225 Difference]: With dead ends: 215 [2023-04-02 22:39:57,082 INFO L226 Difference]: Without dead ends: 206 [2023-04-02 22:39:57,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 128 SyntacticMatches, 6 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=179, Invalid=943, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 22:39:57,083 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 139 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 75 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2023-04-02 22:39:57,084 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 200 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 149 Invalid, 2 Unknown, 0 Unchecked, 10.4s Time] [2023-04-02 22:39:57,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2023-04-02 22:39:57,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 192. [2023-04-02 22:39:57,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 94 states have (on average 1.1808510638297873) internal successors, (111), 99 states have internal predecessors, (111), 84 states have call successors, (84), 14 states have call predecessors, (84), 13 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2023-04-02 22:39:57,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 273 transitions. [2023-04-02 22:39:57,132 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 273 transitions. Word has length 54 [2023-04-02 22:39:57,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:39:57,133 INFO L495 AbstractCegarLoop]: Abstraction has 192 states and 273 transitions. [2023-04-02 22:39:57,133 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (18), 5 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2023-04-02 22:39:57,133 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 273 transitions. [2023-04-02 22:39:57,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 22:39:57,140 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:39:57,141 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:39:57,148 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 22:39:57,348 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:57,349 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:39:57,349 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:39:57,349 INFO L85 PathProgramCache]: Analyzing trace with hash -2007447518, now seen corresponding path program 1 times [2023-04-02 22:39:57,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:39:57,349 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615157930] [2023-04-02 22:39:57,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:57,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:39:57,362 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:39:57,362 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1459285617] [2023-04-02 22:39:57,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:39:57,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:39:57,362 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:39:57,365 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:39:57,366 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 22:39:57,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:39:57,588 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 27 conjunts are in the unsatisfiable core [2023-04-02 22:39:57,591 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:57,847 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 23 proven. 10 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 22:39:57,847 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:40:10,697 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:40:10,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615157930] [2023-04-02 22:40:10,697 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:40:10,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459285617] [2023-04-02 22:40:10,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459285617] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:40:10,698 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [285111719] [2023-04-02 22:40:10,699 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-04-02 22:40:10,699 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:40:10,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:40:10,700 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:40:10,700 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:40:10,727 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:40:11,506 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2023-04-02 22:40:11,517 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 25 for LOIs [2023-04-02 22:40:11,520 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:40:11,523 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:40:12,382 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3031#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:40:12,382 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:40:12,382 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:40:12,383 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2023-04-02 22:40:12,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084401463] [2023-04-02 22:40:12,383 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:40:12,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-02 22:40:12,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:40:12,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-02 22:40:12,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=832, Unknown=3, NotChecked=0, Total=930 [2023-04-02 22:40:12,384 INFO L87 Difference]: Start difference. First operand 192 states and 273 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 9 states have internal predecessors, (24), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2023-04-02 22:40:18,749 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:40:24,427 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:40:26,434 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:40:26,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:40:26,934 INFO L93 Difference]: Finished difference Result 268 states and 384 transitions. [2023-04-02 22:40:26,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 22:40:26,934 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 9 states have internal predecessors, (24), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 54 [2023-04-02 22:40:26,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:40:26,936 INFO L225 Difference]: With dead ends: 268 [2023-04-02 22:40:26,936 INFO L226 Difference]: Without dead ends: 200 [2023-04-02 22:40:26,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 85 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=110, Invalid=943, Unknown=3, NotChecked=0, Total=1056 [2023-04-02 22:40:26,938 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 13 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 13 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:40:26,938 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 147 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 325 Invalid, 3 Unknown, 0 Unchecked, 14.5s Time] [2023-04-02 22:40:26,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2023-04-02 22:40:26,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 200. [2023-04-02 22:40:26,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 100 states have (on average 1.16) internal successors, (116), 105 states have internal predecessors, (116), 84 states have call successors, (84), 16 states have call predecessors, (84), 15 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2023-04-02 22:40:26,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 278 transitions. [2023-04-02 22:40:26,969 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 278 transitions. Word has length 54 [2023-04-02 22:40:26,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:40:26,969 INFO L495 AbstractCegarLoop]: Abstraction has 200 states and 278 transitions. [2023-04-02 22:40:26,970 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 9 states have internal predecessors, (24), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2023-04-02 22:40:26,970 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 278 transitions. [2023-04-02 22:40:26,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-04-02 22:40:26,971 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:40:26,971 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:40:26,980 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-02 22:40:27,176 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-04-02 22:40:27,177 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:40:27,177 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:40:27,177 INFO L85 PathProgramCache]: Analyzing trace with hash -301051426, now seen corresponding path program 2 times [2023-04-02 22:40:27,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:40:27,177 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798466788] [2023-04-02 22:40:27,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:40:27,178 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:40:27,184 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:40:27,184 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [165950293] [2023-04-02 22:40:27,184 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:40:27,184 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:40:27,184 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:40:27,185 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:40:27,210 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 22:40:27,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 22:40:27,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:40:27,315 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 25 conjunts are in the unsatisfiable core [2023-04-02 22:40:27,317 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:40:30,416 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 18 proven. 3 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-04-02 22:40:30,417 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:43:26,526 WARN L223 SmtUtils]: Spent 34.09s on a formula simplification. DAG size of input: 238 DAG size of output: 205 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)