./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c5f4858505c444657049a34bd1efbc3b1e97c5e32733a83c11ccaa8ea369cb2f --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 08:22:07,133 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 08:22:07,203 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 08:22:07,208 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 08:22:07,209 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 08:22:07,233 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 08:22:07,234 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 08:22:07,234 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 08:22:07,235 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 08:22:07,235 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 08:22:07,236 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 08:22:07,237 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 08:22:07,237 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 08:22:07,238 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 08:22:07,238 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 08:22:07,239 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 08:22:07,239 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 08:22:07,240 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 08:22:07,240 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 08:22:07,241 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 08:22:07,241 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 08:22:07,244 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 08:22:07,244 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 08:22:07,245 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 08:22:07,245 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 08:22:07,246 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 08:22:07,246 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 08:22:07,247 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 08:22:07,247 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 08:22:07,247 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 08:22:07,248 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 08:22:07,248 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 08:22:07,248 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 08:22:07,249 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 08:22:07,249 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 08:22:07,249 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 08:22:07,249 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 08:22:07,250 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 08:22:07,250 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 08:22:07,250 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 08:22:07,250 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 08:22:07,251 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 08:22:07,251 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 08:22:07,251 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 08:22:07,251 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 08:22:07,252 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 08:22:07,252 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 08:22:07,252 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c5f4858505c444657049a34bd1efbc3b1e97c5e32733a83c11ccaa8ea369cb2f [2023-12-02 08:22:07,469 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 08:22:07,493 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 08:22:07,496 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 08:22:07,498 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 08:22:07,498 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 08:22:07,500 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2023-12-02 08:22:10,320 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 08:22:10,524 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 08:22:10,525 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2023-12-02 08:22:10,538 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/data/260d6bbff/e5d4184aca4249aeb0488f67c0dd664b/FLAGc9a04dc83 [2023-12-02 08:22:10,553 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/data/260d6bbff/e5d4184aca4249aeb0488f67c0dd664b [2023-12-02 08:22:10,556 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 08:22:10,558 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 08:22:10,559 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 08:22:10,559 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 08:22:10,565 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 08:22:10,566 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:10,567 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@36fb6afb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10, skipping insertion in model container [2023-12-02 08:22:10,567 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:10,615 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 08:22:10,828 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[7806,7819] [2023-12-02 08:22:10,866 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 08:22:10,883 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 08:22:10,934 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[7806,7819] [2023-12-02 08:22:10,960 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 08:22:10,977 INFO L206 MainTranslator]: Completed translation [2023-12-02 08:22:10,978 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10 WrapperNode [2023-12-02 08:22:10,978 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 08:22:10,978 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 08:22:10,979 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 08:22:10,979 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 08:22:10,984 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:10,997 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:11,039 INFO L138 Inliner]: procedures = 22, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 675 [2023-12-02 08:22:11,040 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 08:22:11,041 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 08:22:11,041 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 08:22:11,041 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 08:22:11,048 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:11,049 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:11,053 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:11,054 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:11,068 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:11,075 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:11,078 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:11,082 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:11,088 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 08:22:11,089 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 08:22:11,089 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 08:22:11,089 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 08:22:11,090 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (1/1) ... [2023-12-02 08:22:11,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 08:22:11,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:22:11,125 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 08:22:11,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 08:22:11,180 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 08:22:11,180 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 08:22:11,181 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 08:22:11,181 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 08:22:11,327 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 08:22:11,329 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 08:22:11,884 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 08:22:12,142 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 08:22:12,142 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-12-02 08:22:12,144 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:22:12 BoogieIcfgContainer [2023-12-02 08:22:12,144 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 08:22:12,147 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 08:22:12,147 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 08:22:12,150 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 08:22:12,150 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 08:22:10" (1/3) ... [2023-12-02 08:22:12,150 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45abfe2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:22:12, skipping insertion in model container [2023-12-02 08:22:12,151 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:22:10" (2/3) ... [2023-12-02 08:22:12,151 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45abfe2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:22:12, skipping insertion in model container [2023-12-02 08:22:12,151 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:22:12" (3/3) ... [2023-12-02 08:22:12,153 INFO L112 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2023-12-02 08:22:12,167 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 08:22:12,168 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 08:22:12,212 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 08:22:12,218 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=LoopHeads, 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;@5d5016d1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 08:22:12,218 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 08:22:12,223 INFO L276 IsEmpty]: Start isEmpty. Operand has 104 states, 96 states have (on average 1.78125) internal successors, (171), 103 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:12,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-12-02 08:22:12,230 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:12,231 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:12,231 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:12,235 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:12,235 INFO L85 PathProgramCache]: Analyzing trace with hash -560120458, now seen corresponding path program 1 times [2023-12-02 08:22:12,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:12,242 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163366495] [2023-12-02 08:22:12,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:12,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:12,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:12,565 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:22:12,565 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:12,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163366495] [2023-12-02 08:22:12,566 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163366495] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:12,566 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:12,566 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:22:12,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495594419] [2023-12-02 08:22:12,568 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:12,571 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:22:12,571 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:12,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:22:12,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:12,599 INFO L87 Difference]: Start difference. First operand has 104 states, 96 states have (on average 1.78125) internal successors, (171), 103 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:12,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:12,675 INFO L93 Difference]: Finished difference Result 234 states and 364 transitions. [2023-12-02 08:22:12,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:22:12,677 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2023-12-02 08:22:12,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:12,687 INFO L225 Difference]: With dead ends: 234 [2023-12-02 08:22:12,688 INFO L226 Difference]: Without dead ends: 146 [2023-12-02 08:22:12,690 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:12,694 INFO L413 NwaCegarLoop]: 239 mSDtfsCounter, 110 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:12,695 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 365 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:12,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2023-12-02 08:22:12,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 144. [2023-12-02 08:22:12,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.4335664335664335) internal successors, (205), 143 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:12,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 205 transitions. [2023-12-02 08:22:12,734 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 205 transitions. Word has length 43 [2023-12-02 08:22:12,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:12,734 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 205 transitions. [2023-12-02 08:22:12,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:12,735 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 205 transitions. [2023-12-02 08:22:12,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 08:22:12,737 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:12,737 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:12,737 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 08:22:12,738 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:12,738 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:12,738 INFO L85 PathProgramCache]: Analyzing trace with hash -1985689482, now seen corresponding path program 1 times [2023-12-02 08:22:12,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:12,739 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761462573] [2023-12-02 08:22:12,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:12,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:12,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:12,869 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:22:12,870 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:12,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761462573] [2023-12-02 08:22:12,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761462573] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:12,871 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:12,871 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:22:12,871 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033485819] [2023-12-02 08:22:12,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:12,872 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:22:12,873 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:12,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:22:12,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:12,874 INFO L87 Difference]: Start difference. First operand 144 states and 205 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:12,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:12,931 INFO L93 Difference]: Finished difference Result 321 states and 478 transitions. [2023-12-02 08:22:12,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:22:12,932 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2023-12-02 08:22:12,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:12,934 INFO L225 Difference]: With dead ends: 321 [2023-12-02 08:22:12,934 INFO L226 Difference]: Without dead ends: 209 [2023-12-02 08:22:12,935 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:12,937 INFO L413 NwaCegarLoop]: 122 mSDtfsCounter, 91 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:12,938 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 215 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:12,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2023-12-02 08:22:12,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 207. [2023-12-02 08:22:12,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 206 states have (on average 1.4563106796116505) internal successors, (300), 206 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:12,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 300 transitions. [2023-12-02 08:22:12,954 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 300 transitions. Word has length 45 [2023-12-02 08:22:12,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:12,955 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 300 transitions. [2023-12-02 08:22:12,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:12,955 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 300 transitions. [2023-12-02 08:22:12,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 08:22:12,957 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:12,957 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:12,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 08:22:12,958 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:12,958 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:12,958 INFO L85 PathProgramCache]: Analyzing trace with hash -845964841, now seen corresponding path program 1 times [2023-12-02 08:22:12,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:12,959 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [869533225] [2023-12-02 08:22:12,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:12,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:12,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:13,064 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:22:13,064 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:13,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [869533225] [2023-12-02 08:22:13,065 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [869533225] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:13,065 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:13,065 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:22:13,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253435011] [2023-12-02 08:22:13,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:13,066 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:22:13,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:13,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:22:13,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:13,067 INFO L87 Difference]: Start difference. First operand 207 states and 300 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:13,104 INFO L93 Difference]: Finished difference Result 511 states and 763 transitions. [2023-12-02 08:22:13,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:22:13,105 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2023-12-02 08:22:13,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:13,107 INFO L225 Difference]: With dead ends: 511 [2023-12-02 08:22:13,108 INFO L226 Difference]: Without dead ends: 338 [2023-12-02 08:22:13,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:13,110 INFO L413 NwaCegarLoop]: 168 mSDtfsCounter, 90 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:13,111 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 265 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:13,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2023-12-02 08:22:13,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 336. [2023-12-02 08:22:13,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 1.471641791044776) internal successors, (493), 335 states have internal predecessors, (493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 493 transitions. [2023-12-02 08:22:13,128 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 493 transitions. Word has length 47 [2023-12-02 08:22:13,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:13,128 INFO L495 AbstractCegarLoop]: Abstraction has 336 states and 493 transitions. [2023-12-02 08:22:13,129 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,129 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 493 transitions. [2023-12-02 08:22:13,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-12-02 08:22:13,131 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:13,131 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:13,131 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 08:22:13,131 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:13,132 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:13,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1675416450, now seen corresponding path program 1 times [2023-12-02 08:22:13,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:13,132 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287866479] [2023-12-02 08:22:13,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:13,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:13,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:13,221 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:22:13,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:13,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287866479] [2023-12-02 08:22:13,222 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [287866479] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:13,222 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:13,222 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:22:13,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240010717] [2023-12-02 08:22:13,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:13,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:22:13,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:13,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:22:13,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:13,224 INFO L87 Difference]: Start difference. First operand 336 states and 493 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:13,259 INFO L93 Difference]: Finished difference Result 827 states and 1242 transitions. [2023-12-02 08:22:13,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:22:13,260 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2023-12-02 08:22:13,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:13,264 INFO L225 Difference]: With dead ends: 827 [2023-12-02 08:22:13,264 INFO L226 Difference]: Without dead ends: 525 [2023-12-02 08:22:13,265 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:13,266 INFO L413 NwaCegarLoop]: 131 mSDtfsCounter, 89 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:13,267 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 232 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:13,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 525 states. [2023-12-02 08:22:13,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 525 to 523. [2023-12-02 08:22:13,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 523 states, 522 states have (on average 1.4923371647509578) internal successors, (779), 522 states have internal predecessors, (779), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 523 states to 523 states and 779 transitions. [2023-12-02 08:22:13,283 INFO L78 Accepts]: Start accepts. Automaton has 523 states and 779 transitions. Word has length 49 [2023-12-02 08:22:13,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:13,284 INFO L495 AbstractCegarLoop]: Abstraction has 523 states and 779 transitions. [2023-12-02 08:22:13,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,284 INFO L276 IsEmpty]: Start isEmpty. Operand 523 states and 779 transitions. [2023-12-02 08:22:13,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-12-02 08:22:13,286 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:13,286 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:13,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 08:22:13,287 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:13,287 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:13,287 INFO L85 PathProgramCache]: Analyzing trace with hash 1103142179, now seen corresponding path program 1 times [2023-12-02 08:22:13,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:13,287 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218962635] [2023-12-02 08:22:13,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:13,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:13,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:13,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:22:13,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:13,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218962635] [2023-12-02 08:22:13,370 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218962635] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:13,370 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:13,370 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:22:13,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629656379] [2023-12-02 08:22:13,371 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:13,371 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:22:13,371 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:13,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:22:13,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:13,372 INFO L87 Difference]: Start difference. First operand 523 states and 779 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:13,412 INFO L93 Difference]: Finished difference Result 1343 states and 2014 transitions. [2023-12-02 08:22:13,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:22:13,413 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2023-12-02 08:22:13,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:13,418 INFO L225 Difference]: With dead ends: 1343 [2023-12-02 08:22:13,418 INFO L226 Difference]: Without dead ends: 870 [2023-12-02 08:22:13,419 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:13,420 INFO L413 NwaCegarLoop]: 143 mSDtfsCounter, 84 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:13,421 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 241 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:13,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 870 states. [2023-12-02 08:22:13,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 870 to 868. [2023-12-02 08:22:13,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 868 states, 867 states have (on average 1.4798154555940024) internal successors, (1283), 867 states have internal predecessors, (1283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 868 states to 868 states and 1283 transitions. [2023-12-02 08:22:13,446 INFO L78 Accepts]: Start accepts. Automaton has 868 states and 1283 transitions. Word has length 51 [2023-12-02 08:22:13,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:13,446 INFO L495 AbstractCegarLoop]: Abstraction has 868 states and 1283 transitions. [2023-12-02 08:22:13,447 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,447 INFO L276 IsEmpty]: Start isEmpty. Operand 868 states and 1283 transitions. [2023-12-02 08:22:13,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 08:22:13,448 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:13,448 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:13,448 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 08:22:13,448 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:13,449 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:13,449 INFO L85 PathProgramCache]: Analyzing trace with hash 1180359130, now seen corresponding path program 1 times [2023-12-02 08:22:13,449 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:13,449 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232578995] [2023-12-02 08:22:13,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:13,450 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:13,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:13,529 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:22:13,529 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:13,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232578995] [2023-12-02 08:22:13,530 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232578995] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:13,530 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:13,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:22:13,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549055705] [2023-12-02 08:22:13,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:13,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:22:13,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:13,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:22:13,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:13,532 INFO L87 Difference]: Start difference. First operand 868 states and 1283 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:13,573 INFO L93 Difference]: Finished difference Result 2175 states and 3253 transitions. [2023-12-02 08:22:13,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:22:13,574 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2023-12-02 08:22:13,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:13,582 INFO L225 Difference]: With dead ends: 2175 [2023-12-02 08:22:13,582 INFO L226 Difference]: Without dead ends: 1357 [2023-12-02 08:22:13,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:13,597 INFO L413 NwaCegarLoop]: 132 mSDtfsCounter, 83 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:13,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 234 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:13,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1357 states. [2023-12-02 08:22:13,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1357 to 1355. [2023-12-02 08:22:13,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1355 states, 1354 states have (on average 1.4903988183161005) internal successors, (2018), 1354 states have internal predecessors, (2018), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1355 states to 1355 states and 2018 transitions. [2023-12-02 08:22:13,642 INFO L78 Accepts]: Start accepts. Automaton has 1355 states and 2018 transitions. Word has length 53 [2023-12-02 08:22:13,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:13,642 INFO L495 AbstractCegarLoop]: Abstraction has 1355 states and 2018 transitions. [2023-12-02 08:22:13,642 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,643 INFO L276 IsEmpty]: Start isEmpty. Operand 1355 states and 2018 transitions. [2023-12-02 08:22:13,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-12-02 08:22:13,643 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:13,644 INFO L195 NwaCegarLoop]: trace histogram [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, 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] [2023-12-02 08:22:13,644 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 08:22:13,644 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:13,645 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:13,645 INFO L85 PathProgramCache]: Analyzing trace with hash -1278960837, now seen corresponding path program 1 times [2023-12-02 08:22:13,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:13,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069415663] [2023-12-02 08:22:13,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:13,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:13,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:13,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:22:13,778 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:13,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069415663] [2023-12-02 08:22:13,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069415663] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:13,778 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:13,778 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 08:22:13,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355329081] [2023-12-02 08:22:13,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:13,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 08:22:13,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:13,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 08:22:13,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 08:22:13,780 INFO L87 Difference]: Start difference. First operand 1355 states and 2018 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:13,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:13,964 INFO L93 Difference]: Finished difference Result 3443 states and 5162 transitions. [2023-12-02 08:22:13,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 08:22:13,965 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2023-12-02 08:22:13,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:13,977 INFO L225 Difference]: With dead ends: 3443 [2023-12-02 08:22:13,977 INFO L226 Difference]: Without dead ends: 2136 [2023-12-02 08:22:13,979 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-12-02 08:22:13,979 INFO L413 NwaCegarLoop]: 133 mSDtfsCounter, 525 mSDsluCounter, 821 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 525 SdHoareTripleChecker+Valid, 954 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:13,980 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [525 Valid, 954 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:22:13,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2136 states. [2023-12-02 08:22:14,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2136 to 2110. [2023-12-02 08:22:14,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2110 states, 2109 states have (on average 1.498814604077762) internal successors, (3161), 2109 states have internal predecessors, (3161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:14,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2110 states to 2110 states and 3161 transitions. [2023-12-02 08:22:14,038 INFO L78 Accepts]: Start accepts. Automaton has 2110 states and 3161 transitions. Word has length 55 [2023-12-02 08:22:14,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:14,038 INFO L495 AbstractCegarLoop]: Abstraction has 2110 states and 3161 transitions. [2023-12-02 08:22:14,039 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:14,039 INFO L276 IsEmpty]: Start isEmpty. Operand 2110 states and 3161 transitions. [2023-12-02 08:22:14,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-12-02 08:22:14,039 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:14,040 INFO L195 NwaCegarLoop]: trace histogram [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, 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] [2023-12-02 08:22:14,040 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 08:22:14,040 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:14,040 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:14,040 INFO L85 PathProgramCache]: Analyzing trace with hash -1055584469, now seen corresponding path program 1 times [2023-12-02 08:22:14,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:14,041 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226874627] [2023-12-02 08:22:14,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:14,041 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:14,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:14,129 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:22:14,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:14,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226874627] [2023-12-02 08:22:14,129 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1226874627] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:14,129 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:14,129 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 08:22:14,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682627912] [2023-12-02 08:22:14,130 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:14,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 08:22:14,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:14,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 08:22:14,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:22:14,131 INFO L87 Difference]: Start difference. First operand 2110 states and 3161 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:14,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:14,210 INFO L93 Difference]: Finished difference Result 4156 states and 6241 transitions. [2023-12-02 08:22:14,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 08:22:14,211 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2023-12-02 08:22:14,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:14,223 INFO L225 Difference]: With dead ends: 4156 [2023-12-02 08:22:14,223 INFO L226 Difference]: Without dead ends: 2112 [2023-12-02 08:22:14,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 08:22:14,226 INFO L413 NwaCegarLoop]: 125 mSDtfsCounter, 174 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:14,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [174 Valid, 342 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:14,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2112 states. [2023-12-02 08:22:14,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2112 to 2107. [2023-12-02 08:22:14,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2107 states, 2106 states have (on average 1.4938271604938271) internal successors, (3146), 2106 states have internal predecessors, (3146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:14,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2107 states to 2107 states and 3146 transitions. [2023-12-02 08:22:14,297 INFO L78 Accepts]: Start accepts. Automaton has 2107 states and 3146 transitions. Word has length 56 [2023-12-02 08:22:14,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:14,298 INFO L495 AbstractCegarLoop]: Abstraction has 2107 states and 3146 transitions. [2023-12-02 08:22:14,298 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:14,298 INFO L276 IsEmpty]: Start isEmpty. Operand 2107 states and 3146 transitions. [2023-12-02 08:22:14,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 08:22:14,299 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:14,299 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:14,299 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 08:22:14,299 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:14,300 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:14,300 INFO L85 PathProgramCache]: Analyzing trace with hash 2141046368, now seen corresponding path program 1 times [2023-12-02 08:22:14,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:14,300 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217812749] [2023-12-02 08:22:14,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:14,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:14,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:14,556 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:22:14,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:14,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217812749] [2023-12-02 08:22:14,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217812749] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:14,556 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:14,556 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 08:22:14,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932804101] [2023-12-02 08:22:14,557 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:14,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 08:22:14,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:14,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 08:22:14,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 08:22:14,558 INFO L87 Difference]: Start difference. First operand 2107 states and 3146 transitions. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:14,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:14,654 INFO L93 Difference]: Finished difference Result 3440 states and 5082 transitions. [2023-12-02 08:22:14,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 08:22:14,655 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2023-12-02 08:22:14,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:14,674 INFO L225 Difference]: With dead ends: 3440 [2023-12-02 08:22:14,674 INFO L226 Difference]: Without dead ends: 3438 [2023-12-02 08:22:14,675 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:22:14,676 INFO L413 NwaCegarLoop]: 211 mSDtfsCounter, 176 mSDsluCounter, 461 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 672 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:14,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [176 Valid, 672 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 08:22:14,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3438 states. [2023-12-02 08:22:14,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3438 to 2151. [2023-12-02 08:22:14,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2151 states, 2150 states have (on average 1.4730232558139535) internal successors, (3167), 2150 states have internal predecessors, (3167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:14,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2151 states to 2151 states and 3167 transitions. [2023-12-02 08:22:14,739 INFO L78 Accepts]: Start accepts. Automaton has 2151 states and 3167 transitions. Word has length 64 [2023-12-02 08:22:14,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:14,740 INFO L495 AbstractCegarLoop]: Abstraction has 2151 states and 3167 transitions. [2023-12-02 08:22:14,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:14,740 INFO L276 IsEmpty]: Start isEmpty. Operand 2151 states and 3167 transitions. [2023-12-02 08:22:14,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2023-12-02 08:22:14,741 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:14,741 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:14,741 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 08:22:14,741 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:14,742 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:14,742 INFO L85 PathProgramCache]: Analyzing trace with hash -53824523, now seen corresponding path program 1 times [2023-12-02 08:22:14,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:14,742 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507847255] [2023-12-02 08:22:14,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:14,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:14,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:16,892 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:22:16,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:16,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507847255] [2023-12-02 08:22:16,893 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [507847255] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:22:16,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039144796] [2023-12-02 08:22:16,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:16,894 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:22:16,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:22:16,897 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:22:16,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 08:22:17,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:17,059 INFO L262 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 21 conjunts are in the unsatisfiable core [2023-12-02 08:22:17,067 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:22:17,648 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 08:22:17,648 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:22:17,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039144796] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:17,649 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:22:17,649 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [13] total 16 [2023-12-02 08:22:17,649 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005084033] [2023-12-02 08:22:17,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:17,650 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 08:22:17,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:17,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 08:22:17,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2023-12-02 08:22:17,651 INFO L87 Difference]: Start difference. First operand 2151 states and 3167 transitions. Second operand has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:17,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:17,759 INFO L93 Difference]: Finished difference Result 6183 states and 9113 transitions. [2023-12-02 08:22:17,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 08:22:17,759 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2023-12-02 08:22:17,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:17,775 INFO L225 Difference]: With dead ends: 6183 [2023-12-02 08:22:17,775 INFO L226 Difference]: Without dead ends: 4095 [2023-12-02 08:22:17,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2023-12-02 08:22:17,778 INFO L413 NwaCegarLoop]: 206 mSDtfsCounter, 307 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 307 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:17,779 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [307 Valid, 320 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:17,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4095 states. [2023-12-02 08:22:17,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4095 to 4093. [2023-12-02 08:22:17,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4093 states, 4092 states have (on average 1.464809384164223) internal successors, (5994), 4092 states have internal predecessors, (5994), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:17,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4093 states to 4093 states and 5994 transitions. [2023-12-02 08:22:17,846 INFO L78 Accepts]: Start accepts. Automaton has 4093 states and 5994 transitions. Word has length 74 [2023-12-02 08:22:17,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:17,846 INFO L495 AbstractCegarLoop]: Abstraction has 4093 states and 5994 transitions. [2023-12-02 08:22:17,846 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:17,846 INFO L276 IsEmpty]: Start isEmpty. Operand 4093 states and 5994 transitions. [2023-12-02 08:22:17,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-12-02 08:22:17,847 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:17,848 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:17,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 08:22:18,049 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 08:22:18,049 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:18,050 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:18,050 INFO L85 PathProgramCache]: Analyzing trace with hash 1704488236, now seen corresponding path program 1 times [2023-12-02 08:22:18,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:18,051 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803579088] [2023-12-02 08:22:18,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:18,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:18,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:18,129 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 08:22:18,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:18,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803579088] [2023-12-02 08:22:18,129 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803579088] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:18,129 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:18,129 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:22:18,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686681453] [2023-12-02 08:22:18,129 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:18,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:22:18,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:18,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:22:18,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:18,131 INFO L87 Difference]: Start difference. First operand 4093 states and 5994 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:18,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:18,202 INFO L93 Difference]: Finished difference Result 9497 states and 13962 transitions. [2023-12-02 08:22:18,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:22:18,202 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2023-12-02 08:22:18,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:18,231 INFO L225 Difference]: With dead ends: 9497 [2023-12-02 08:22:18,232 INFO L226 Difference]: Without dead ends: 5462 [2023-12-02 08:22:18,237 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:18,238 INFO L413 NwaCegarLoop]: 136 mSDtfsCounter, 86 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:18,238 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 244 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:18,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5462 states. [2023-12-02 08:22:18,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5462 to 5460. [2023-12-02 08:22:18,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5460 states, 5459 states have (on average 1.4559443121450815) internal successors, (7948), 5459 states have internal predecessors, (7948), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:18,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5460 states to 5460 states and 7948 transitions. [2023-12-02 08:22:18,359 INFO L78 Accepts]: Start accepts. Automaton has 5460 states and 7948 transitions. Word has length 75 [2023-12-02 08:22:18,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:18,360 INFO L495 AbstractCegarLoop]: Abstraction has 5460 states and 7948 transitions. [2023-12-02 08:22:18,360 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:18,360 INFO L276 IsEmpty]: Start isEmpty. Operand 5460 states and 7948 transitions. [2023-12-02 08:22:18,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-12-02 08:22:18,361 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:18,361 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:18,361 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-12-02 08:22:18,361 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:18,362 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:18,362 INFO L85 PathProgramCache]: Analyzing trace with hash -1406117521, now seen corresponding path program 1 times [2023-12-02 08:22:18,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:18,362 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [176716477] [2023-12-02 08:22:18,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:18,362 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:18,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:18,493 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 08:22:18,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:18,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [176716477] [2023-12-02 08:22:18,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [176716477] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:18,494 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:18,494 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 08:22:18,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222820254] [2023-12-02 08:22:18,494 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:18,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 08:22:18,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:18,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 08:22:18,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 08:22:18,496 INFO L87 Difference]: Start difference. First operand 5460 states and 7948 transitions. Second operand has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:18,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:18,620 INFO L93 Difference]: Finished difference Result 10864 states and 15829 transitions. [2023-12-02 08:22:18,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 08:22:18,621 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2023-12-02 08:22:18,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:18,650 INFO L225 Difference]: With dead ends: 10864 [2023-12-02 08:22:18,650 INFO L226 Difference]: Without dead ends: 5460 [2023-12-02 08:22:18,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:22:18,657 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 321 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 321 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:18,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [321 Valid, 118 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:18,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5460 states. [2023-12-02 08:22:18,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5460 to 5460. [2023-12-02 08:22:18,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5460 states, 5459 states have (on average 1.4396409598827624) internal successors, (7859), 5459 states have internal predecessors, (7859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:18,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5460 states to 5460 states and 7859 transitions. [2023-12-02 08:22:18,772 INFO L78 Accepts]: Start accepts. Automaton has 5460 states and 7859 transitions. Word has length 78 [2023-12-02 08:22:18,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:18,772 INFO L495 AbstractCegarLoop]: Abstraction has 5460 states and 7859 transitions. [2023-12-02 08:22:18,773 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:18,773 INFO L276 IsEmpty]: Start isEmpty. Operand 5460 states and 7859 transitions. [2023-12-02 08:22:18,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-12-02 08:22:18,774 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:18,774 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:18,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-12-02 08:22:18,774 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:18,775 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:18,775 INFO L85 PathProgramCache]: Analyzing trace with hash -2031379766, now seen corresponding path program 1 times [2023-12-02 08:22:18,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:18,775 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83712094] [2023-12-02 08:22:18,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:18,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:18,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:19,826 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 08:22:19,827 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:19,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83712094] [2023-12-02 08:22:19,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83712094] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:22:19,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1589705762] [2023-12-02 08:22:19,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:19,828 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:22:19,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:22:19,829 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:22:19,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 08:22:19,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:19,986 INFO L262 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 21 conjunts are in the unsatisfiable core [2023-12-02 08:22:19,991 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:22:20,353 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 08:22:20,353 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:22:20,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1589705762] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:20,354 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:22:20,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 13 [2023-12-02 08:22:20,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98814902] [2023-12-02 08:22:20,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:20,355 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 08:22:20,355 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:20,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 08:22:20,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2023-12-02 08:22:20,356 INFO L87 Difference]: Start difference. First operand 5460 states and 7859 transitions. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:20,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:20,443 INFO L93 Difference]: Finished difference Result 15817 states and 22717 transitions. [2023-12-02 08:22:20,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 08:22:20,444 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2023-12-02 08:22:20,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:20,462 INFO L225 Difference]: With dead ends: 15817 [2023-12-02 08:22:20,462 INFO L226 Difference]: Without dead ends: 10404 [2023-12-02 08:22:20,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2023-12-02 08:22:20,469 INFO L413 NwaCegarLoop]: 202 mSDtfsCounter, 309 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 309 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:20,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [309 Valid, 314 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:20,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10404 states. [2023-12-02 08:22:20,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10404 to 10402. [2023-12-02 08:22:20,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10402 states, 10401 states have (on average 1.4245745601384483) internal successors, (14817), 10401 states have internal predecessors, (14817), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:20,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10402 states to 10402 states and 14817 transitions. [2023-12-02 08:22:20,639 INFO L78 Accepts]: Start accepts. Automaton has 10402 states and 14817 transitions. Word has length 78 [2023-12-02 08:22:20,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:20,640 INFO L495 AbstractCegarLoop]: Abstraction has 10402 states and 14817 transitions. [2023-12-02 08:22:20,640 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:20,640 INFO L276 IsEmpty]: Start isEmpty. Operand 10402 states and 14817 transitions. [2023-12-02 08:22:20,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-12-02 08:22:20,641 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:20,642 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:20,647 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 08:22:20,842 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 08:22:20,842 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:20,843 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:20,843 INFO L85 PathProgramCache]: Analyzing trace with hash -198823967, now seen corresponding path program 1 times [2023-12-02 08:22:20,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:20,843 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201096602] [2023-12-02 08:22:20,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:20,843 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:20,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:20,890 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 08:22:20,890 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:20,890 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201096602] [2023-12-02 08:22:20,890 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201096602] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:20,890 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:20,890 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:22:20,890 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643095007] [2023-12-02 08:22:20,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:20,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:22:20,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:20,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:22:20,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:20,892 INFO L87 Difference]: Start difference. First operand 10402 states and 14817 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:20,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:20,962 INFO L93 Difference]: Finished difference Result 24560 states and 35141 transitions. [2023-12-02 08:22:20,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:22:20,962 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2023-12-02 08:22:20,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:20,981 INFO L225 Difference]: With dead ends: 24560 [2023-12-02 08:22:20,981 INFO L226 Difference]: Without dead ends: 14200 [2023-12-02 08:22:20,990 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:20,990 INFO L413 NwaCegarLoop]: 136 mSDtfsCounter, 90 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:20,991 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 241 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:21,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14200 states. [2023-12-02 08:22:21,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14200 to 14198. [2023-12-02 08:22:21,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14198 states, 14197 states have (on average 1.4147355075015848) internal successors, (20085), 14197 states have internal predecessors, (20085), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:21,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14198 states to 14198 states and 20085 transitions. [2023-12-02 08:22:21,250 INFO L78 Accepts]: Start accepts. Automaton has 14198 states and 20085 transitions. Word has length 79 [2023-12-02 08:22:21,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:21,250 INFO L495 AbstractCegarLoop]: Abstraction has 14198 states and 20085 transitions. [2023-12-02 08:22:21,251 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:21,251 INFO L276 IsEmpty]: Start isEmpty. Operand 14198 states and 20085 transitions. [2023-12-02 08:22:21,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2023-12-02 08:22:21,252 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:21,252 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:21,253 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-12-02 08:22:21,253 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:21,253 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:21,253 INFO L85 PathProgramCache]: Analyzing trace with hash -939138209, now seen corresponding path program 1 times [2023-12-02 08:22:21,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:21,254 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073292934] [2023-12-02 08:22:21,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:21,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:21,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:22,094 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 08:22:22,095 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:22,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073292934] [2023-12-02 08:22:22,095 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073292934] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:22:22,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [939392588] [2023-12-02 08:22:22,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:22,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:22:22,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:22:22,096 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:22:22,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 08:22:22,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:22,275 INFO L262 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 21 conjunts are in the unsatisfiable core [2023-12-02 08:22:22,280 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:22:22,921 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 08:22:22,922 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:22:22,922 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [939392588] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:22,922 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:22:22,922 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 13 [2023-12-02 08:22:22,922 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291693591] [2023-12-02 08:22:22,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:22,923 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 08:22:22,923 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:22,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 08:22:22,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2023-12-02 08:22:22,924 INFO L87 Difference]: Start difference. First operand 14198 states and 20085 transitions. Second operand has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:23,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:23,070 INFO L93 Difference]: Finished difference Result 41426 states and 58471 transitions. [2023-12-02 08:22:23,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 08:22:23,071 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2023-12-02 08:22:23,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:23,128 INFO L225 Difference]: With dead ends: 41426 [2023-12-02 08:22:23,128 INFO L226 Difference]: Without dead ends: 27322 [2023-12-02 08:22:23,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2023-12-02 08:22:23,147 INFO L413 NwaCegarLoop]: 204 mSDtfsCounter, 284 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:23,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 316 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:23,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27322 states. [2023-12-02 08:22:23,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27322 to 27320. [2023-12-02 08:22:23,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27320 states, 27319 states have (on average 1.401844869870786) internal successors, (38297), 27319 states have internal predecessors, (38297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:23,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27320 states to 27320 states and 38297 transitions. [2023-12-02 08:22:23,607 INFO L78 Accepts]: Start accepts. Automaton has 27320 states and 38297 transitions. Word has length 82 [2023-12-02 08:22:23,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:23,608 INFO L495 AbstractCegarLoop]: Abstraction has 27320 states and 38297 transitions. [2023-12-02 08:22:23,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:23,608 INFO L276 IsEmpty]: Start isEmpty. Operand 27320 states and 38297 transitions. [2023-12-02 08:22:23,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2023-12-02 08:22:23,610 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:23,610 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:23,616 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 08:22:23,811 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 08:22:23,811 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:23,812 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:23,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1853744730, now seen corresponding path program 1 times [2023-12-02 08:22:23,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:23,812 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138915891] [2023-12-02 08:22:23,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:23,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:23,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:23,900 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 08:22:23,900 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:23,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138915891] [2023-12-02 08:22:23,901 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1138915891] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:23,901 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:22:23,901 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:22:23,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865143635] [2023-12-02 08:22:23,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:23,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:22:23,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:23,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:22:23,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:23,903 INFO L87 Difference]: Start difference. First operand 27320 states and 38297 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:24,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:24,080 INFO L93 Difference]: Finished difference Result 63452 states and 89143 transitions. [2023-12-02 08:22:24,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:22:24,081 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2023-12-02 08:22:24,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:24,142 INFO L225 Difference]: With dead ends: 63452 [2023-12-02 08:22:24,143 INFO L226 Difference]: Without dead ends: 36226 [2023-12-02 08:22:24,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:22:24,170 INFO L413 NwaCegarLoop]: 138 mSDtfsCounter, 70 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:24,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 245 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:24,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36226 states. [2023-12-02 08:22:24,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36226 to 36224. [2023-12-02 08:22:24,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36224 states, 36223 states have (on average 1.3904149297407724) internal successors, (50365), 36223 states have internal predecessors, (50365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:24,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36224 states to 36224 states and 50365 transitions. [2023-12-02 08:22:24,909 INFO L78 Accepts]: Start accepts. Automaton has 36224 states and 50365 transitions. Word has length 83 [2023-12-02 08:22:24,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:24,909 INFO L495 AbstractCegarLoop]: Abstraction has 36224 states and 50365 transitions. [2023-12-02 08:22:24,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:24,910 INFO L276 IsEmpty]: Start isEmpty. Operand 36224 states and 50365 transitions. [2023-12-02 08:22:24,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-12-02 08:22:24,912 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:24,912 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:24,913 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-12-02 08:22:24,913 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:24,913 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:24,914 INFO L85 PathProgramCache]: Analyzing trace with hash 826884596, now seen corresponding path program 1 times [2023-12-02 08:22:24,914 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:24,914 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657873521] [2023-12-02 08:22:24,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:24,914 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:24,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:26,383 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 08:22:26,383 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:26,383 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1657873521] [2023-12-02 08:22:26,383 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1657873521] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:22:26,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301134839] [2023-12-02 08:22:26,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:26,384 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:22:26,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:22:26,385 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:22:26,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 08:22:26,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:26,533 INFO L262 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 08:22:26,537 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:22:27,307 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 08:22:27,307 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:22:27,307 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1301134839] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:22:27,308 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:22:27,308 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 14 [2023-12-02 08:22:27,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491085992] [2023-12-02 08:22:27,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:22:27,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 08:22:27,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:22:27,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 08:22:27,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2023-12-02 08:22:27,310 INFO L87 Difference]: Start difference. First operand 36224 states and 50365 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 5 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:27,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:22:27,525 INFO L93 Difference]: Finished difference Result 64140 states and 88938 transitions. [2023-12-02 08:22:27,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 08:22:27,526 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 5 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2023-12-02 08:22:27,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:22:27,562 INFO L225 Difference]: With dead ends: 64140 [2023-12-02 08:22:27,562 INFO L226 Difference]: Without dead ends: 28007 [2023-12-02 08:22:27,582 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2023-12-02 08:22:27,583 INFO L413 NwaCegarLoop]: 135 mSDtfsCounter, 581 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 581 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:22:27,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [581 Valid, 246 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 08:22:27,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28007 states. [2023-12-02 08:22:27,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28007 to 27838. [2023-12-02 08:22:27,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27838 states, 27837 states have (on average 1.3833746452563136) internal successors, (38509), 27837 states have internal predecessors, (38509), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:27,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27838 states to 27838 states and 38509 transitions. [2023-12-02 08:22:27,927 INFO L78 Accepts]: Start accepts. Automaton has 27838 states and 38509 transitions. Word has length 86 [2023-12-02 08:22:27,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:22:27,927 INFO L495 AbstractCegarLoop]: Abstraction has 27838 states and 38509 transitions. [2023-12-02 08:22:27,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 5 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 08:22:27,927 INFO L276 IsEmpty]: Start isEmpty. Operand 27838 states and 38509 transitions. [2023-12-02 08:22:27,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-12-02 08:22:27,929 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:22:27,929 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:22:27,934 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 08:22:28,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 08:22:28,129 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:22:28,129 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:22:28,130 INFO L85 PathProgramCache]: Analyzing trace with hash 758293553, now seen corresponding path program 1 times [2023-12-02 08:22:28,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:22:28,130 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071599070] [2023-12-02 08:22:28,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:28,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:22:28,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:29,048 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 08:22:29,048 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:22:29,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071599070] [2023-12-02 08:22:29,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071599070] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:22:29,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796461371] [2023-12-02 08:22:29,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:22:29,049 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:22:29,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:22:29,050 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:22:29,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ed316b1-aa1b-4e9b-b2ab-9a78a53452ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 08:22:29,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:22:29,192 INFO L262 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 40 conjunts are in the unsatisfiable core [2023-12-02 08:22:29,197 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:22:30,004 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 08:22:30,004 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:22:34,448 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:22:34,448 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796461371] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:22:34,448 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [438642522] [2023-12-02 08:22:34,471 INFO L159 IcfgInterpreter]: Started Sifa with 77 locations of interest [2023-12-02 08:22:34,471 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:22:34,475 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:22:34,480 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:22:34,480 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:22:35,778 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 12 [2023-12-02 08:22:43,661 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 262144 conjunctions. This might take some time...